WO2004004092A1

WO2004004092A1 - Dynamo-electric machine

Info

Publication number: WO2004004092A1
Application number: PCT/JP2003/008260
Authority: WO
Inventors: Toshio Kohno; Yoshiyuki Shibata
Original assignee: Toyoda Koki Kabushiki Kaisha
Priority date: 2002-07-01
Filing date: 2003-06-30
Publication date: 2004-01-08

Abstract

A core (12) constituting the stator or rotor of an dynamo-electric machine is formed, at least partially, of an integrated composite material of magnetic powder and an insulating member. Since the composite material of magnetic powder and an insulating member provides a magnetic body also serving as an insulator, a magnetic circuit restricted in eddy current loss can be formed without requiring a laminate structure. In the inventive core (12), reluctance and variation thereof can be reduced as compared with a conventional one. In an dynamo-electric r machine provided with such a core (12), the output can be increased while suppressing cogging torque as compared with an dynamo-electric rotating machine provided with a conventional core.

Description

Description Rotary electric machine Technical field

The present invention relates to a rotating electric machine in which coils are wound around a plurality of teeth formed on a core constituting a stator or a rotor, respectively. Background art

As shown in FIGS. 20 to 22, the conventional motor 1 is such that a rotor 2 made of a permanent magnet or an armature (armature) is inserted into a stator 3, the stator 3 is fitted to a housing 4, and the rotor 2 is And the rotor 2 is rotated by electromagnetic force. The stator 3 is configured by winding a coil 7 around a plurality of teeth 6 protruding inside a core 5. The core 5 is configured by joining a plurality of core pieces 8 in a circumferential direction, and each core piece 8 has a structure in which a plurality of steel plates 9 are laminated. After the electric wire 15 is wound around the teeth 6 formed on each core piece 8 and the coil 7 is provided for each tooth 6, the adjacent core pieces 8, 8 are joined together. Each core piece 8 is opposed to the outer peripheral surface of the rotor 2 at the facing surface b of the tip of the tooth 6, and the wire 15 is wound around the neck 6 by providing a neck portion a substantially at the center of the height (thickness) of the tooth 6. It is easily formed. A plurality of back yokes c formed on the core piece 8 are gathered in the circumferential direction to form a cylindrical side surface outside the stator 3.

As a result, as shown in FIG. 22, when the joint surfaces 9 A, 9 A of the steel plates 9, 9 laminated at the same position on the adjacent core pieces 8, 8 abut against each other, and the coil ⁷ is excited. Then, the magnetic flux is intersected at the contact portions between the joint surfaces 9A, 9A to form a magnetic circuit. FIG. 23 shows a perspective view (a) of one core piece 8 of the conventional stator 3 described above, a side view (b) viewed from the direction A in the perspective view (a), and a neck portion a of the tooth 6. The perspective view (c) showing the space occupied by the wire 15 to be wound is shown. The length 1 ^ of the facing surface b of the teeth 6 formed on each core piece 8 in the longitudinal direction coincides with the height of the above-mentioned cylindrical shape. Further, the width t ₃ of the side view (b) of the core piece 8 when the cross section (cross-sectional area S ₂ ) of the back yoke _{C in} the perspective view (a) is viewed from the C direction includes the thickness of the back yoke c. The height of the core piece 8 is shown. This total height t ₃ corresponds to the radial thickness of the substantially cylindrical stator 3.

However, since each steel plate 2 is formed, for example, by punching from a sheet metal, the central portion of the joining surface 9A of the steel plate 9 and the edge portion 9E do not become flush as shown in FIG. The substantial contact area between the core pieces 8 in which the plurality of steel plates 9 were laminated was reduced and varied by the edge portion 9E of each steel plate 9. For this reason, in the conventional core 5, the magnetic resistance is large and varied as compared with the non-split type core, which causes a problem that the motor output torque is reduced or the cogging torque is increased.

In addition, since the end faces 5 A of the core 5 were flat, the electric wires 15 protruded and protruded from the end faces 5 A, and the entire motor 1 was enlarged by the amount of the protruding electric wires 15. Then, for example, during the work of assembling the core 5 to the housing 4, care must be taken so that the protruding portion of the electric wire 15 does not hit other parts, resulting in poor work efficiency.

FIG. 24 shows the positional relationship between the substantially rectangular confronting surface b of the stator 3 core piece 8 and the cross section of the neck portion a (the cross-sectional area S 1). In the X-axis direction, the confronting surface b of the tooth 6 faces the confronting surface b. It indicates the direction of movement relative to the target (in this case, the rotor). In order to keep the magnetic resistance of the magnetic path in the core piece 8 small, the cross-sectional area S 1 (magnetic-path cross-sectional area) of the neck portion a should be secured to a certain value or more. For this reason, when winding the electric wire 15 around the teeth 6 formed on the core piece 8, as shown in FIGS. In addition, in the relative movement direction X between the stator 5 and the rotor, the height δ 1 at which the electric wire 15 is wound is restricted. However, in order to obtain the desired force and torque from the motor 1, the amount of magnetic flux (upper limit value) that can pass through the cross-sectional area S1 (magnetic-path cross-sectional area) of the neck part a must be kept at a certain level or more. There must be. In other words, the diameter and the number of turns of the electric wire 15 also have necessary values for securing magnetic flux.

Therefore, in order to keep the above restriction on the height δ1, the space occupied by the electric wire 15 wound around the neck a of the case 6 must be inevitably (Fig. 23).

(c) The radial thickness () of) must be increased. For the above reasons, the difficulty in reducing the thickness has been a hindrance to motor miniaturization.

In addition, this problem exists substantially in the same manner as described above when the rotor side of the motor is constituted by an armature, so that the portion having the core piece 8 is provided on either the stator side or the motor side of the motor. However, the above problem that the motor becomes large in the radial direction has not been solved conventionally. Since the motion generated based on the magnetic force between the stator and the rotor of the motor is essentially relative, the motor in which the portion having the core rotates and the portion having the permanent magnet is stationary. The same problem as described above also exists in the case of constructing. Since the exchange of energy between kinetic energy and electric energy is reciprocal, the above problems can be pointed out for ordinary generators as well.

In addition, the core of a motor that has been widely used is a force S formed by laminating steel plates. In this case, the degree of freedom of the shape of the core is low, and therefore, Japanese Patent Application Laid-Open No. 2000-152525 As disclosed, cores composed of magnetic powder have been developed. However, if the entire core is made of magnetic powder, the shape of the core is greatly restricted, and the manufacturing cost is high. Therefore, the development of an inexpensive core with a high degree of freedom in shape has been required. The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce the size and weight of a core having a smaller and less scattered magnetic resistance and a core having such a core as compared with a conventional core. It is intended to provide a possible rotating electric machine.

Another object of the present invention is to improve the manufacturing efficiency of the rotating electric machine and to suppress cogging.

Still another object of the present invention is to provide a core and a rotating electric machine which have a high degree of freedom in shape and can be manufactured at low cost. Disclosure of the invention

According to a first aspect of the present invention, in a rotating electric machine including a plurality of coils formed by winding an electric wire around a plurality of teeth formed on a core constituting a stator or a mouth, the core is divided into a plurality of core pieces. A rotating electrical machine characterized in that at least a part of the core is formed of a composite material of a magnetic powder and an insulating member.

According to the rotating electric machine of the present invention, since the composite material of the magnetic powder and the insulating member is both a magnetic material and an insulating material, it constitutes a magnetic circuit in which eddy current loss is suppressed without having a laminated structure. be able to. Further, since the core piece according to the present invention is formed of the composite material as described above, the flatness of the joint surface between the core pieces can be increased as compared with the conventional multilayer structure. Thus, in the core of the present invention, both the magnetoresistance and the variation in the magnetoresistance can be reduced as compared with the conventional core. And, in the rotating electric machine having such a core, the output torque is increased and the cogging torque can be suppressed as compared with the rotating electric machine having the conventional core. Furthermore, since the core is divided into a plurality of core pieces, the degree of freedom of the shape is higher than that of the conventional case where the entire core is integrally formed. In the rotating electric machine, both the motor and the generator individually correspond to each other. In other words, the present invention converts work between electric energy and kinetic energy, which are arranged in series with respect to the direction of relative movement of the teeth of the core constituting a part of the rotor or the stator. The present invention can be applied to any type of rotating electric machine as long as it is a rotating electric machine.

Further, the present invention relates to the structure of an armature (particularly, the shape, arrangement, and material of a core), and the armature may be either a rotor or a stator. That is, the present invention can be applied to both the rotor and the stator at the same time, or can be applied to only one of them.

In the following description, the operation and effects of the present invention will be specifically described focusing on the shape of the stator of a rotary motor (electric motor). Can also be inevitably obtained based on theoretical symmetry.

A second invention is the rotating electric machine according to the first invention described above, wherein the magnetic powder is iron powder. Since the powder is made of iron powder, it is superior in function and cost.

A third invention is the rotating electric machine according to the above-mentioned first invention, wherein the magnetic powder has a surface insulated with an inorganic oxide. As described above, since the magnetic powder is a magnetic material and its surface is insulated, it is possible to configure a magnetic circuit in which eddy current loss is suppressed without having a laminated structure.

A fourth invention is the rotating electric machine according to the second invention described above, wherein the size of the iron powder is 20 to 100 im. Thereby, the surface of the core can be formed into a flat shape corresponding to the inner surface of the mold.

The fifth invention is directed to any one of the above-described first to fourth inventions. In the rotating electric machine, the insulating member is a synthetic resin. Thus, the magnetic powder can be insulated, and the core can be easily formed of the composite material.

According to a sixth aspect, in the rotating electrical machine according to the first aspect, the winding portion of the electric wire is depressed in a concave shape on both end faces in the axial direction of the core. .

According to the rotating electric machine according to the sixth aspect of the present invention, since the winding portion of the electric wire is depressed in a concave shape on both end surfaces in the axial direction of the core, the electric wire is accommodated in the concave portion, and the core is in comparison with the conventional one. The projecting amount of the electric wire at the end face of the second member is suppressed. Thus, the motor can be made compact in the axial direction. Also, since the electric wire is housed and protected in the concave portion of the core, the possibility of contact with other components is reduced, and the handling of the core is facilitated.

According to a seventh aspect, in the rotating electric machine according to the sixth aspect described above, the core constitutes a stator, and teeth formed on the core are rotated by a magnetic force generating portion provided on the rotor. The length of the winding portion is made shorter than the length of the magnetic force generating portion by making the winding portion of the electric wire concavely depressed out of both end surfaces in the axial direction of the core. A rotating electric machine characterized by the following.

If the winding part of the electric wire is longer than the magnetic force generating part of the rotor, the electric wire becomes longer and the electric resistance increases, resulting in an increase in copper loss. In the rotary electric machine according to the seventh aspect of the present invention, the length of the wound portion of the electric wire is made shorter than the length of the magnetic force generating portion of the rotor by making the wound portion of the electric wire concave and depressed on both end surfaces of the core. Therefore, copper loss is reduced and motor efficiency can be improved. Accordingly, when the output torque is the same between the conventional rotating electric machine and the rotating electric machine of the present invention, the rotating electric machine of the present invention can be downsized because of the higher efficiency. . An eighth invention is the rotating electric machine according to the sixth or seventh invention described above, wherein both end faces in the axial direction of the winding part of the electric wire have a substantially rectangular shape, a substantially circular shape, and a substantially positive shape with an angle close to a circle. A rotating electric machine having a polygonal shape or a substantially elliptical shape. In the rotating electric machine according to the eighth aspect of the present invention, since both end faces of the winding portion of the electric wire in the core are formed in a shape close to a circle, the electric wire can be wound smoothly and stress on the electric wire can be suppressed. Furthermore, the length of the circumference of the neck section can be shortened more effectively without reducing the cross-sectional area (magnetic path cross-sectional area) of the neck section a, so that the length of the distribution line is more effective. Can be shortened. For this reason, the diameter of the electric wire can be reduced as much as possible while keeping the electric resistance value of the electric wire below the conventional value. Therefore, the radial thickness of the space occupied by the electric wire wound around the tooth neck portion a can be reduced more effectively.

According to a ninth aspect, in the rotary electric machine according to the first aspect, the teeth formed on the core forming one of the stator and the rotor have a facing surface facing the other side of the stator or the rotor. And a neck portion of the tooth around which the electric wire is wound is shorter than half the length of the facing surface in the axial direction of the facing surface, and is arranged in a distributed manner. It is.

However, since the rotor and the stator are opposed to each other, the above-mentioned facing surface means that when the core on which the teeth are formed constitutes a part of the rotor, the stator is positioned on the surface of the teeth with respect to the stator. Refers to the side facing you. In the case where the core on which the teeth are formed constitutes a part of the stator, the surface of the teeth facing the rotor is referred to as the facing surface. As can be seen from FIG. 24, the height δ 1 at which the wire is wound around the neck portion a in the relative movement direction X between the stator 3 and the rotor 2 was conventionally strongly restricted. Thus, the restriction on the height δ 1 can be greatly reduced. For this reason, the radial thickness of the space occupied by the electric wire wound around the neck portion a of the teeth can be made smaller than in the conventional case, so that the motor can be easily downsized. Also, according to the above configuration, the circumference of the neck section can be made shorter than before without reducing the cross-sectional area (magnetic path cross-sectional area) of the neck part a compared to the conventional one, so that the wire length can be reduced accordingly. Can be shortened. For this reason, the diameter of the electric wire can be reduced while the electric resistance value of the electric wire is kept below the conventional value. With this function, the radial thickness of the space occupied by the electric wire wound around the neck portion a of the teeth formed on the core can be made smaller than before.

In addition, according to the above configuration, it is possible to manufacture the motor so that the coil end does not protrude from the facing surface in the y-axis direction in FIG. 24. The size can be reduced. This has the effect. According to a tenth aspect, in the rotary electric machine according to the ninth aspect, the core has a plurality of back yoke portions connected in a direction in which the stator and the rotor can move relative to each other. Are periodically selected and are integrally fixed to any one of the back yoke portions via the neck portion, so that all of the opposing surfaces are mutually engaged without excess or shortage. A rotating electric machine characterized in that a magnetic flux path of an armature is formed by combining the back yoke portions of the steps.

According to the rotating electric machine according to the tenth aspect, the neck portions of the teeth formed on the core can be arranged at intervals of n (n≥l). Therefore, the coil can be efficiently wound around the neck portion of the teeth using a simple device such as a nozzle-type winding machine. Further, according to the above configuration, every n neck portions of the teeth

Since (n≥1), the outer shape of the armature consisting of the facing surfaces of the armature can be accurately or easily manufactured into a desired shape.

When the rotor of the motor or the generator is constituted by the armature having the above-mentioned core, the above-mentioned back yoke portion can be formed around the rotation axis. At this time, if a hollow body is formed on the rotary shaft, the back yoke portion becomes substantially ring-shaped, and has a shape that is directly connected to the relative movement direction of the motor. You don't have to be a cave. The radius of such a substantially ring-shaped hollow portion (the above-mentioned cavity) is

If the shape of the back yoke is recognized at the limit of 0, the shape of the back yoke can be regarded as a shape connected in the relative movable direction even if the rotating shaft is buried with a magnetic material or the like. Can be.

The eleventh invention is directed to the rotating electric machine according to the ninth or tenth invention, wherein a plurality of the neck parts are periodically dispersed and arranged obliquely with respect to a relative movable direction of the stator and the rotor. It is a rotating electric machine characterized by being performed.

According to the rotating electric machine according to the eleventh aspect, the neck portion and the coil of the tooth can be relatively and densely and efficiently dispersed on the back side of the facing surface of the tooth formed on the core. The space behind the surface can be used efficiently. Therefore, it is possible to effectively reduce the size of the rotating electric machine.

According to a twelfth aspect, in the rotating electric machine according to the ninth or tenth aspect, when the relative movable direction of the stator and the rotor is viewed as a front-rear direction, the neck portions are alternately arranged left and right. (Staggered arrangement). Since the necks are arranged in a staggered manner, the necks and the coils can be relatively densely and efficiently distributed.

According to a thirteenth aspect, in the rotary electric machine according to the first aspect, the core is formed by laminating a powder core member formed of a composite material of a magnetic powder and an insulating member, and a steel plate. A rotating electric machine characterized in that the rotating electric machine is formed by joining a steel core structure made of a steel sheet.

When the core is made of a magnetic powder composite material, a complicated structure can be easily manufactured as compared with the case where the core is formed by stacking steel plates. On the other hand, when a core is formed by stacking steel sheets, it is possible to manufacture the core at a lower cost than a force composite material in which it is difficult to form irregularities in the laminating direction. Therefore, in the core of the rotating electrical machine according to the thirteenth aspect, the portion that was difficult to be formed by laminating steel plates is constituted by a powder core structure made of a magnetic composite material, The part which does not require the degree of freedom of the shape was constituted by a steel core structure. As a result, the degree of freedom of the shape is higher than when the entire core is made of a steel plate, and the core can be manufactured at a lower cost than when the entire core is integrally formed of a composite material.

A fourteenth invention is directed to the rotating electric machine according to the thirteenth invention, wherein the rotating electric machine is provided for the powder-made core structure, and is provided at both ends of the steel structure in the stacking direction of the steel plates. A rotary electric machine, wherein the core members made of powder are joined to each other.

In the core of the rotary electric machine according to the fourteenth aspect, the core structure made of powder is joined to both ends of the steel core structure in the stacking direction of the steel plates, so that the size of the core in the axial direction is increased. When the number of steel sheets is changed, it can be easily dealt with by changing the number of stacked steel sheets in the steel core structure.

A fifteenth invention is directed to a rotating electric machine including a plurality of coils formed by winding an electric wire around a plurality of teeth formed on a core constituting a stator or a rotor, wherein the electric wire is formed on both axial end surfaces of the core. The rotating electric machine is characterized in that the winding part of the above is depressed in a concave shape.

According to the rotating electric machine according to the fifteenth aspect, since the winding portion of the electric wire is concavely depressed at both end surfaces in the axial direction of the core, the electric wire is accommodated in the concave portion, and the core is more squeezed than the conventional one. The projecting amount of the electric wire at the end face of the second member is suppressed. Thus, the motor can be made compact in the axial direction. Also, since the wire is housed in the concave portion of the core and protected, the possibility of contact with other components is reduced, and the handling of the core is facilitated.

According to a sixteenth invention, in the rotating electric machine according to the fifteenth invention, the core forms a stator, and the teeth formed on the core are arranged on a shaft by a magnetic force generating portion provided on the rotor. The length of the winding portion is made shorter than the length of the magnetic force generating portion by making the winding portion of the electric wire concave and depressed at both end surfaces in the axial direction of the core. It is a rotating electric machine characterized by the above. In the rotating electric machine according to the sixteenth aspect of the present invention, the length of the winding portion of the electric wire is shorter than the length of the magnetic force generating portion of the rotor by making the winding portion of the electric wire concave and concave on both end surfaces of the core. As a result, the copper loss is reduced, and the efficiency of the motor can be improved. Thus, when the output torque of the conventional rotating electric machine and that of the rotating electric machine of the present invention are the same, the rotating electric machine of the present invention can be downsized because of its higher efficiency.

A seventeenth invention is the rotating electric machine according to the fifteenth or sixteenth invention, wherein both end faces in the axial direction of the winding portion of the electric wire have a substantially rectangular shape, a substantially circular shape having a nearly circular angle, and a substantially circular shape. , A substantially regular polygon, or a substantially elliptical shape. In the rotating electric machine according to the seventeenth aspect of the present invention, both ends of the winding portion of the electric wire in the core are formed in a shape close to a circle, so that the electric wire can be wound smoothly and stress on the electric wire is suppressed. Can be Furthermore, the perimeter of the neck section can be shortened more effectively without reducing the cross-sectional area (magnetic path cross-sectional area) of the neck section a, so that the wire length can be shortened more effectively. it can. For this reason, the diameter of the electric wire can be reduced as much as possible while maintaining the electric resistance of the electric wire at a value equal to or lower than the conventional value. Therefore, the radial thickness of the space occupied by the electric wire wound around the tooth neck portion a can be reduced more effectively.

An eighteenth invention is directed to a rotating electric machine including a plurality of coils formed by winding an electric wire around a plurality of teeth formed on a core constituting a stator or a rotor, the electric machine being formed on a core constituting one of the stator and the rotor. The tooth has a facing surface facing the other of the stator and the rotor, and the neck portion of the tooth around which the wire is wound is shorter than half the length of the facing surface in the axial direction of the facing surface. And a rotating electric machine characterized by being distributedly arranged.

As can be seen from Fig. 24, in the past, in the relative movement direction X of the stator 3 and the rotor 2, there was a strong restriction on the height δ1 at which the wire was wound around the neck part a. In the configuration of the rotating electric machine according to the eighteenth aspect, the restriction on the height δ1 can be greatly reduced. For this reason, the radial thickness of the space occupied by the electric wire wound around the neck portion a of the teeth can be made smaller than in the past, so that the motor can be easily downsized.

Also, according to the above configuration, the perimeter of the cross section of the neck portion can be made shorter than before without making the cross-sectional area (magnetic path cross-sectional area) of the neck portion a smaller than in the past, so that the length of the electric wire is reduced accordingly Can be shortened. For this reason, the diameter of the electric wire can be reduced while the electric resistance value of the electric wire is kept below the conventional value. With this function, the radial thickness of the space occupied by the electric wire wound around the neck portion a of the teeth formed on the core can be made smaller than before.

In addition, according to the above configuration, it is possible to manufacture the motor so that the coil end does not protrude from the facing surface in the y-axis direction in FIG. 24. The size can be reduced.

A nineteenth invention is directed to the rotating electric machine according to the eighteenth invention, further comprising a plurality of back yoke portions connected in a direction in which the core force, the stator and the rotor are relatively movable, and a plurality of the facing surfaces. Are selected periodically, and are integrally fixed to the back yoke portion via the neck portion in a single step, so that all the opposing surfaces are mutually intact without excess or shortage. In addition, a rotating electric machine is characterized in that a magnetic flux path of an armature is formed by combining a plurality of stages of the back yoke portions.

According to the rotating electric machine according to the nineteenth aspect, the neck portions of the teeth formed on the core can be arranged every η (η≥1). Therefore, the coil can be efficiently wound around the neck portion of the teeth using a simple device such as a nozzle-type winding machine. Furthermore, according to the above configuration, the neck portions of the teeth can be integrated at every η teeth (η≥1), so that the outer shape of the armature formed by the facing surfaces of the armature can be accurately manufactured into a desired shape. Possible or easy. When the rotor of the motor or the generator is constituted by the armature having the above-mentioned core, the above-mentioned back yoke portion can be formed around the rotation axis. At this time, if a hollow body is formed on the rotary shaft, the back yoke portion becomes substantially ring-shaped, and has a shape that is directly connected to the relative movement direction of the motor. It doesn't need to be a cave. By recognizing the shape of the back yoke portion at the limit where the radius of such a substantially ring-shaped hollow portion (the above-described cavity) becomes zero, even if the rotating shaft is buried with a magnetic material or the like, the The shape of the yoke portion can be seen as a shape connected in the relative movable direction.

According to a twenty-second aspect, in the rotating electric machine according to the eighteenth or nineteenth aspect, the neck portion is periodically arranged by being obliquely arranged in a plurality with respect to a relative movable direction of the stator and the rotor. A rotating electric machine characterized by being arranged.

According to the rotating electric machine according to the twenty-first aspect, the neck portion and the coil of the teeth can be relatively densely and efficiently dispersed on the back side of the facing surface of the teeth formed on the core. The space behind the surface can be used efficiently. Therefore, it is possible to effectively reduce the size of the rotating electric machine.

According to a twenty-first aspect, in the rotating electric machine according to the eighteenth or nineteenth aspect, when the relative movable direction of the stator and the rotor is viewed as a front-rear direction, the neck portion is alternately distributed to the left and right. A rotating electric machine characterized by being arranged (staggered arrangement). Since the necks are arranged in a staggered manner, the necks and the coils can be relatively densely and efficiently distributed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of a core and a rotor of a stator of a rotating electric machine according to a first embodiment of the present invention, FIG. 2 is a perspective view of the core, and FIG. FIG. 4 is a conceptual view of a composite material with members, FIG. 4 is a partially enlarged side view showing a joined state of core pieces, and FIG. 5 is a core and a core according to a second embodiment of the present invention. FIG. 6 is a perspective view of the core piece, FIG. 7 is a side sectional view of the core piece, and FIG. 8 is a perspective view of the core piece taken along a line AA in FIG. FIG. 9 is a partial perspective view of the core (101, 102) when assembling the rotary motor according to the third embodiment of the present invention. Figure 0 is a perspective view (a) of one tooth portion of the core (101) viewed from the substantially rectangular facing surface b, a side view of the magnetic core viewed in the B direction (b), and the tooth. FIG. 11 is a perspective view (c) showing a space occupied by an electric wire wound around a neck portion a of FIG. 11; FIG. 11 is a sectional view of a substantially rectangular confronting surface b of the teeth of a core (101); FIG. 12 is an exploded plan view showing a positional relationship with (: cross-sectional area S 3). FIG. FIG. 13 is an exploded plan view showing the positional relationship between the confronting surface b and the cross section of the neck part a. FIG. 13 is a plan view of a substantially rectangular confronting surface b of the teeth of the core according to a modification of the fourth embodiment of the present invention. FIG. 14 is an exploded plan view showing the positional relationship between the neck portion a and the cross section. FIG. 14 is a perspective view of the core when assembling the rotary motor according to the fifth embodiment of the present invention. FIG. 5 is a partial perspective view of the core when assembling the rotary motor according to the sixth embodiment of the present invention. FIG. 16 is an assembly of the rotary motor according to the fifth embodiment of the present invention. FIG. 17 is a partial perspective view of the core at the time, FIG. 17 is a perspective view of the core according to the seventh embodiment of the present invention, and FIG. 18 is an exploded perspective view of the core; Fig. 9 is a side sectional view of the core teeth, and Fig. 20 is an exploded view of a conventional motor. FIG. 21 is a perspective view of a core of a conventional stator, and FIG. 22 is a partially enlarged side view showing a joined state of conventional core pieces, and FIG. The perspective view (a) of one core piece of the stator viewed from the generally rectangular facing surface b, the side view (b) of the core piece viewed from the C direction, and the electric wire wound around the tooth neck part a FIG. 24 is a perspective view (c) showing the space occupied, and FIG. 24 is a planar development showing a positional relationship between a substantially rectangular confronting surface b of the teeth of the core and a cross section of the neck portion a (: cross sectional area S 1). FIG. BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment)

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The motor 10 shown in FIG. 1 is a brushless motor, and includes a stator core 12 inside a cylindrical housing 11. The core 12 has a shape with an open end, and can be vertically divided into a plurality of (specifically, for example, 12) core pieces 14 in the circumferential direction.

The core piece 14 is formed of a composite material of a magnetic powder and an insulating member, and has a structure in which a T-shaped tooth 13 is formed to project toward the inside of the core 12 as shown in FIG. . The composite material is shown conceptually on an enlarged scale in FIG. 3.For example, the surface of iron powder F as a magnetic powder of 20 to 100 / m is insulated with phosphoric acid P, and the iron Powder F is compounded with synthetic resin G. Then, for example, in a state where the synthetic resin G is melted, the composite material is filled into a mold (not shown) corresponding to each core piece 14, and then solidified from the mold after the synthetic resin G is solidified. The composite material is taken out and the core piece 14 is completed. Therefore, the joint surface 14 A (see FIG. 2) of the core piece 14 with the adjacent core piece 14 has a flat shape corresponding to the inner surface of the mold.

As shown in FIG. 1, the wire winding portion 21 corresponding to the T-shaped leg of the teeth 13 of each core piece 14 has a coil 20 in the longitudinal direction (axial direction) of each core piece 14. Is wound. Thus, the group of core pieces 14 including the coils 20 is joined to each other to form a stator. Here, since the joining surface 14 A of the core piece 14 of the present embodiment has a flat shape corresponding to the molding die of the composite material as described above, the joining surface 14 A of the conventional laminated structure stator is used. Flatness is higher than core (see Fig. 21). Further, as shown in FIG. 4, if the edge portion E of the joint surface 14 A of the core piece 14 is, for example, receded from the center portion of the joint surface 14 A, for example. Even so, since the core piece 14 of the present embodiment is not a laminated structure but an integrally molded product made of a composite material, the ratio occupied by the edge portion E is smaller than that of the conventional core piece at the joint surface (see FIG. 22). Is extremely small compared to the ratio occupied by the edges. As a result, in the core piece 14 of the present embodiment, the contact area between the joint surfaces 14A is larger than that of the conventional core, the magnetic resistance is smaller than that of the conventional core, and the variation of the magnetic resistance is also small. Can be suppressed.

The cores 12 formed by joining the core pieces 14 in this manner are, for example, shrink-fitted into the cylindrical housing 11 after the ends of the coils 20 of the core pieces 14 are connected at one end. Is done. Then, the rotor 16 is disposed inside the core 12, and both ends of the cylindrical housing 11 are closed to complete the motor 10. In the motor 10 having the above configuration, the core 12 built into the motor 10 and the magnetic resistance and the variation of the magnetic resistance are both smaller than those of the conventional core, so that the output torque of the motor 10 is larger than that of the conventional motor. And cogging torque can be suppressed.

(Second embodiment)

Next, a second embodiment of the present invention will be described with reference to FIGS. The motor 10 shown in FIG. 5 is a brushless motor similar to that of the first embodiment, and is formed by winding an electric wire 40 around a stator 12 core 12 provided inside a cylindrical housing 11. Of the coil 20. Note that FIG. 5 shows only a part of the portion where the electric wire 40 is wound. The core 12 has a cylindrical shape entirely open at both ends, and can be vertically divided into a plurality (specifically, for example, 12) of core pieces 14 in the circumferential direction. The core piece 14 is formed of a composite material of a magnetic powder and an insulating member. As shown in FIG. 6, the core piece 14 has a structure in which a T-shaped tooth 13 is formed to project toward the inside of the core 12. I have. The composite material is the same as that of the first embodiment shown in FIG.

As shown in FIG. 5, the electric wire 40 is connected to the teeth 13 of each core piece 14. The coil 20 is wound around a wire winding portion 21 (corresponding to the “winding portion J of the wire” according to the present invention) corresponding to a T-shaped leg portion. However, in the present embodiment, as shown in FIG. 7, only the wire winding portion 21 is depressed on both axial end surfaces 14 A of the core piece 14 (that is, both end surfaces 12 A of the core 12). The recessed portion 41 is formed, and the electric wire 40 is completely accommodated in the recessed portion 41 without protruding from the end surface 14A of the core piece 14 as shown in FIG. In addition, since the electric wire 40 is bundled in the concave portion 41, the wire binding process conventionally required is not necessary, and both end surfaces 2 A of the wire winding portion 21 in the axial direction are not required. It forms an arc shape as shown in Fig. 8. This makes it possible to smoothly wind the electric wire 40 around the concave portion 41 and to store the electric wire 40 on the wire 40. And reliability is improved.

The core pieces 14 are joined together to form a cylindrical core 12. Here, the wire 40 is concave at both end faces of the core piece 14 ^

Therefore, the possibility of contact with other parts is reduced, and the handling of the core piece 14 is facilitated. Therefore, the efficiency of the assembling work of the core pieces 14 is improved. In a state where the core pieces 14 are grouped together to form the cores 12, the ends of the coils 20 of the respective core pieces 14 are connected at one end of the cores 12. At this time, since the electric wire 40 does not protrude from the end face of the core 12, it does not hinder the connection processing, and the efficiency of the connection work is improved. The core 12 on which the above-described connection processing is completed is, for example, shrink-fitted into the cylindrical housing 11.

Next, the rotor 16 is disposed inside the core 12. The length L 3 of the permanent magnet 16 M (corresponding to the “magnetic force generating portion” of the present invention) provided on the rotor 16 is, as shown in FIG. It is slightly shorter than 1. The length L 2 of the wire winding portion 21 of the core 12 is shorter than the length L 3 of the permanent magnet 16. Then, as shown in the figure, in the direction orthogonal to the axial direction (the left-right direction in FIG. 7), the entire wire winding portion 21 is located between both end surfaces of the permanent magnet 16M. The rotor 16 is positioned so as to face each other, and both ends of the cylindrical housing 11 are closed to complete the motor.

The motor 10 of the present embodiment is as described above, and the operation and effect will be described below. In the motor 10 of the present embodiment, the electric wires 40 are accommodated in the concave portions 41 formed on both end surfaces in the axial direction of the core 12, and the amount of protrusion of the electric wires on the end surface of the core is suppressed as compared with the conventional motor. Can be Thereby, the motor 10 can be made compact in the axial direction. In this embodiment, the recesses 41 are formed on both end faces of the core 12 so that the axial length of the teeth 13 is made equal to the length of the permanent magnet 16 M of the rotor 16. While keeping the length of the wire winding portion 21 shorter than the length of the permanent magnet 16 M in the rotor 16, copper loss is reduced and efficiency is improved. Therefore, when the output torque of the conventional motor is the same as that of the motor 10 of the present embodiment, the motor 10 of the present embodiment is superior in efficiency to the conventional motor because of its higher efficiency. Downsizing.

Further, since the composite material forming the core 12 is made of a magnetic powder and an insulating member, and is a magnetic material and an insulating material, it is possible to form a magnetic circuit in which eddy current loss is suppressed. In a structure in which steel plates are laminated like a conventional core, it is difficult to manufacture a structure in which a part is depressed in the axial direction.However, in the present embodiment, the composite material is formed by molding on both end surfaces. The core 12 having the shape with the concave portion 41 can be easily manufactured.

The present invention is not limited to the second embodiment. For example, modifications described below are also included in the technical scope of the present invention. Various changes can be made within the range.

(1) In the second embodiment, the stator 12 S is provided with the core 12 and the coil 20 is wound, but the stator is provided with the permanent magnet, while the rotor is provided with the core, The present invention may be applied to a motor having a structure in which a coil is provided by winding an electric wire around a core. In this case, the electrical contact between the axial end faces of the core constituting the rotor What is necessary is just to make the winding part of a wire depress in a concave shape.

(2) In the second embodiment, the present invention has been described by taking a brushless motor as an example. However, the present invention may be applied to a stepping motor or an induction motor.

(3) In the second embodiment, both ends in the axial direction of the wire winding part 21 are formed in an arc shape as a whole, but both ends of the wire winding part may be flat.

(4) In the second embodiment, the core 12 has a shape in which only the wire winding portion 21 of both ends 12 A of the core 12 is depressed. Also, the axial lengths of the circumferential side and the outer circumferential side may be different. In other words, in FIG. 7, the axial length of the teeth 13 on the inner peripheral side is set to L1 as shown in the figure, and the outer peripheral length is set to the same length L2 as the wire winding portion 21. Is also good.

(5) The core 12 of the second embodiment may be formed by laminating force steel plates formed of a composite material of a magnetic powder and an insulating member.

(6) In the second embodiment, the electric wire 40 is completely housed in the recess 41 and does not protrude from the end face 12A of the core 12, but the recess is formed in the end face of the core. As long as the protrusion amount of the electric wire can be suppressed by this, a part of the electric wire may protrude from the end face of the core.

(Third embodiment)

FIG. 9 is a partial perspective view of the core (101, 102) when assembling the rotary motor according to the third embodiment. Symbols a, b, and c in the figure denote a neck portion of the teeth formed on the core, a facing surface of the teeth formed on the core, and a back yoke portion of the core, respectively.

This core is formed by assembling the upper part 101 and the lower part 102 into one. These parts are made of a compacted material consisting of a composite of powdered pure iron powder and resin, the surfaces of which are insulated with oxide (inorganic insulation). (See Figure 3). Symbols u, V, and w attached above the facing surface b of the teeth formed on each core represent the corresponding phases during three-phase control. FIG. 10 is a perspective view (a) of one tooth of the core (101) viewed from the substantially rectangular facing surface b, a side view (b) of the tooth as viewed in the B direction, and FIG. FIG. 3C is a perspective view illustrating a space occupied by a coil wound around a tooth neck a.

In this core, the length 1 ^ in the longitudinal direction of each confronting surface b and the cross-sectional area S3 of each neck portion a are set to the same size (new S1) as the conventional core shown in Figs. Is set.

Also the cross-sectional area S ₂ of the back yoke portion c of FIG. 23 (a), between the cross-sectional area S ₄ of the back yoke portion c of the first 0 view (a), the following relationship.

[Equation 1]

_{_{S 4 = S 2/2 ...}} (1) This is the core of the first 0 diagram (a) is to be configured for both the upper 10 1 and the lower 1 0 2 to one, thus, The cross-sectional area of the back part c after assembling the two is set to be the same as that of the conventional core.

FIG. 11 is an exploded plan view showing the positional relationship between each facing surface b of the teeth of the core (101, 102) of the third embodiment and the cross-sectional area S 3) of the neck portion a. is there. That is, according to the configuration illustrated in FIGS. 9 and 10 as described above, the swelling (height δ 3) of the electric wire in the X direction (relative movable direction) when the electric wire is wound around the network portion a is determined. It is possible to take a large amount. Therefore, the first 0 view (b), the thickness t ₂ of (c), since it is possible to narrower than the conventional, the thickness t ₄ of the cores, can be thinned Ri by conventional, thus the motor is effectively small Be converted to

Further, according to the above configuration, it is possible to shorten the circumference of the cross section of the neck portion a while maintaining the cross sectional area of the neck portion a. For this reason, the wire can be shortened, and the wire can be made thinner than before, while maintaining the electric resistance value of the wire below the conventional value. By these actions, according to the above configuration, the core can be reduced in size and the weight of the core can be reduced. (Fourth embodiment)

In the third embodiment described above, the core is separated into upper and lower (101, 102) and separately formed, and the back yoke portion c is in the shape of two strips. To separate the back yoke into three strips (upper, middle, and lower), integrate the teeth corresponding to each phase (u-phase, V-phase, and w-phase). You can combine them.

FIG. 12 is an exploded plan view showing the positional relationship between the substantially rectangular facing surface b of the tooth formed at the end of the fourth embodiment and the cross section of the neck portion a. In the staggered arrangement of the third embodiment, two teeth necks are periodically arranged diagonally, but in the fourth embodiment, the number of teeth necks arranged on one oblique line e is three. And periodically disperse them. Further, in FIG. 12, the cross-sectional shape of the neck portion a is substantially circular, but may be formed as a sub-ellipse or the like.

For example, in this way, the three back yoke parts are combined and integrated so that the teeth formed on the three back yoke parts are placed every two in the relative movement direction (the direction of the X axis). In this case, it is possible to provide a spatial margin in the X-axis direction on the side of the neck portion a, so that the cross-sectional shape of the neck portion a should be substantially circular or a shape similar to the third embodiment. It is relatively easy, almost in the same manner as in the embodiment, and the motor can be effectively reduced in size.

Furthermore, according to the above configuration, the back yoke portion of the core can be integrated by combining each phase (u, v, w), so that the wiring configuration of the electric wires can be simply summarized for each phase. Are obtained. Therefore, according to the above configuration, the winding-related manufacturing efficiency is further improved.

FIG. 13 shows the positional relationship between the substantially rectangular facing surface b of the teeth formed on the back yoke portion and the cross section of the neck portion a in a modification of the fourth embodiment. For example, like this, the cross-sectional shape of the neck portion a is a parallelogram, a rhombus, or It may be deformed into a sub-elliptical shape close to an egg shape or the like. For example, it is possible to augment the cross-sectional area of the neck portion a by such a deformation.

(Fifth embodiment)

FIG. 14 is a perspective view of the core when assembling the rotary motor of the fifth embodiment. This core is obtained by forming the back yoke c of the core of FIG. 9 of the third embodiment vertically in units of each tooth along the rotation axis direction of the rotor. For example, even if the back yoke c of the core is vertically divided in the same manner as in the related art, the same operation as in the third embodiment can be effectively performed as in the third embodiment. Can be reduced in size.

(Sixth embodiment)

FIGS. 15 and 16 are partial perspective views of the core when assembling the rotary motor of the sixth embodiment. In this embodiment, a plurality of (12) teeth are arranged in series in the direction of relative movement with respect to the opposing surface b of the teeth constituting a part of the core shown in FIGS. In this motor, a back yoke c connected in the relative movable direction is provided in two upper and lower stages.

Although FIG. 15 shows only five teeth having the facing surface b in total, in this embodiment, a total of 12 teeth are selected every other in the above-mentioned relative movable direction. And is integrally fixed to one of the back yokes c via the neck portion a. Also, as shown in Figs. 15 and 16, a two-stage back yoke c is combined, and all facing surfaces b are combined with each other without excess or shortage to form a magnetic flux path of the armature. . Also, in this core, the neck portion a, the force S, and the teeth facing surface b, which are long in the rotation axis direction of the rotor, are substantially the same.

According to such a configuration, each of the teeth having the facing surface b is connected to either the upper or lower back yoke c by joining by fitting or screw fixing, etc., or by forming by molding or the like. When they are integrally formed, every other neck portion a can be arranged. Therefore, before assembly, as shown in Fig. 15, A gap for each tooth can be secured. Therefore, according to such a configuration, the electric wire can be efficiently and easily wound around the neck portion a of the tooth using a simple device such as a nozzle-type winding machine. Further, according to the above configuration, each tooth can be integrated with one of the upper and lower back yokes c having a substantially ring shape, and thereby each tooth can be accurately and reliably fixed at a desired position. The outer shape of a core having a large number of teeth (a cylindrical shape directly approaching and facing the rotor) can be accurately or easily manufactured into a desired cylindrical shape with high roundness.

(Seventh embodiment)

Hereinafter, a seventh embodiment of the present invention will be described with reference to FIGS. In the present embodiment, for example, the present invention is applied to a stator core 30 provided in a brushless motor similar to the first embodiment. As shown in FIG. 17, the stator core 30 includes a plurality of teeth 32 protruding inward from the inner peripheral surface of the cylindrical portion 31. Then, the electric wire 40 (see FIG. 19) is wound around each tooth 32, and the rotor 16 is loosely fitted in the space inside the tooth 32, and the rotor 16 receives magnetic force from the coil. 1 6 rotates.

On both end surfaces of the core 30, core protrusions 34 are formed to protrude in the axial direction from portions located on the inner edge side of the teeth 32. As shown in FIG. 19, the outer surface of the core projection 34 opposite to the rotor 16 is concavely curved along the axial direction and is gently lowered. The inner surface of the core projection 34 facing the rotor 16 is flush with the main body of the teeth 32.

Now, as shown in FIG. 17, the core 30 of the present embodiment is composed of three parts which are divided into three in a ring shape. In detail, the positions of the core 30 near the both ends in the axial direction are defined as bonding surfaces 30S, and a pair of powder core members 35, on the end side of the bonding surfaces 30S, 30S, The core component 36 made of a steel plate is sandwiched between the core components 35 and 35 made of powder. The core structure 36 made of steel plate A plurality of silicon steel sheets 37 of the same shape (see Fig. 18) are laminated on each other. Therefore, the length of the steel plate core component 36 can be easily changed by changing the number of silicon steel plates 37 to be laminated. On the other hand, the powder core structure 35 is formed of a composite material (see FIG. 3) of magnetic powder and an insulating member.

Then, powder core components 35, 35 are joined to both end surfaces of the steel core component 36, and the teeth 32 provided on each of the core components 35, 36 are aligned with each other. The impregnated material is immersed in the impregnated state, and is integrated by the adhesive action of the impregnated material to form the stator core 30. Then, the electric wires 40 are wound around the respective teeth 32 of the completed stator core 30 as described above, whereby the respective core components 35, 36 are physically fixed.

Now, in the present embodiment, at the end of the core 30, the electric wire 40 is arranged at a portion outside the core protrusion 34 (a portion opposite to the rotor). That is, as shown in FIG. 19, the electric wire 40 is accommodated at a position lower than the core protrusion 34 on the end face of the core 30. Thereby, the contact between the electric wire 40 and other parts is regulated, and the electric wire 40 is protected. Further, since the electric wires 40 are pressed against the core protrusions 34 to be collected, the binding process of the electric wires 40 which is conventionally required is not required.

In addition, if the wire winding portion of the core member 35 made of powder is formed in an arc shape along the winding direction of the wire 40, stress on the wire 40 is suppressed, and reliability is improved. Up.

The core 30 after the winding process of the electric wire 40 is completed is, for example, shrink-fitted in a cylindrical housing (not shown) as a stator, and then a rotor 16 is arranged inside the stator. Here, the length L 3 of the permanent magnet 16 M (corresponding to the “magnetic force generating portion” of the present invention) provided in the rotor 16 is, as shown in FIG. It is slightly shorter than L1. In addition, the length L2 of the wire winding portion of the stator core 30 is shorter than the length L3 of the permanent magnet 16M. Then, as shown in the same figure, in the direction orthogonal to the axial direction (the left-right direction in FIG. 19), the permanent magnet The rotor 16 is positioned so that the entire wire winding portion faces between both end surfaces of the stone 16M, and both ends of the cylindrical housing are closed, thereby completing the motor.

According to the core 30 of the present embodiment, since both ends in the axial direction of the core 30 are constituted by a pair of core members 35 and 35 made of powder, both ends of the stator core 30 are formed. The degree of freedom in shape increases. Thereby, it is possible to form the core protrusions 34 at both ends of the stator core 30. In addition, since the steel core component 36 made of laminated steel plates is provided between the pair of powder core components 35, 35, compared to the case where the whole is made of a composite material, And can be manufactured at low cost. In order to obtain a plurality of types of cores having different axial lengths, it is only necessary to change the number of silicon steel plates 37 to be laminated on the core members 36 made of steel plates. Components 35 and 35 can be made common components.

Further, by forming the core projections 34 on both end surfaces of the core 30, the length of the teeth 32 (L 1 in FIG. 19) on the rotor 16 side is reduced by the permanent magnets 16 on the rotor 16. Keeping the length of the wire winding (L 2 in FIG. 19) equal to the length of the permanent magnet 16 M Can be shortened. This reduces copper losses and improves efficiency. Therefore, when the output torque of the motor having the conventional core and the motor having the core 30 of the present embodiment are the same, the motor having the core 30 of the present embodiment has a higher efficiency. As a result, the size can be reduced compared to the conventional one.

In the above embodiment, a three-phase motor has been described as an example. However, the present invention is applicable to any motor such as a stepping motor or an induction motor without depending on the type and control method of a special motor. be able to.

The features such as the shape, arrangement, configuration, and material of the core in each of the above embodiments can be applied to the rotor of the electric motor. In particular, when applied to a rotor, it is possible to reduce the inertia of the rotor by reducing the weight of the electric wires. Wear. In addition, the features such as the shape, arrangement, configuration, and material of the core in each of the above embodiments can be applied to a generator. In addition, the present invention can be variously modified and implemented without departing from the gist. Industrial applicability

A rotating electric machine according to the present invention converts a rotation of a steering wheel by a driver into an axial movement of a rack shaft by a rack and pinion mechanism, and amplifies the axial movement of the rack shaft by an electric motor to assist the steering force. Also, it is suitable for use as an electric motor in an electric power steering device for automobiles that deflects steered wheels via a knuckle arm.

Claims

The scope of the claims

1. In a rotating electric machine having a plurality of coils formed by winding an electric wire around a plurality of teeth formed on a core constituting a stator or a rotor,

A rotating electric machine, wherein the core is divided into a plurality of core pieces, and at least a part of the core is formed of a composite material of a magnetic powder and an insulating member.

2. In the rotating electric machine according to the first aspect,

The rotating electric machine, wherein the magnetic powder is iron powder.

3. In the rotating electric machine according to the first aspect,

A rotating electric machine, wherein the surface of the magnetic powder is insulated with an inorganic oxide.

4. In the rotating electric machine according to the second aspect,

The rotating electric machine, wherein the size of the iron powder is 20 to 100 / m.

5. In the rotary electric machine according to any one of the first to fourth inventions,

The rotating electric machine, wherein the insulating member is a synthetic resin.

6. In the rotating electric machine according to the first aspect,

A rotating electric machine characterized in that a winding portion of the electric wire is concavely depressed in both axial end surfaces of the core.

7. In the rotating electric machine according to the sixth aspect,

The core constitutes a stator, and a surface formed on the core is longer in an axial direction than a magnetic force generating portion provided on the rotor. A rotating electric machine characterized in that a wound portion of the electric wire is concavely depressed in both axial end surfaces of the core so that the length of the wound portion is shorter than the length of the magnetic force generating portion. .

8. In the rotating electric machine according to the sixth or seventh invention,

A rotating electric machine, wherein both end faces in the axial direction of the winding part of the electric wire are substantially rectangular, substantially circular, substantially regular polygonal, or substantially elliptical, with an angle close to a circle.

9. In the rotating electric machine according to the first aspect,

Teeth formed on a core constituting one of the stator and the rotor have a facing surface facing the other of the stator and the rotor,

A rotating electric machine characterized in that neck portions of the teeth around which electric wires are wound are shorter than half the length of the facing surface in the axial direction of the facing surface, and are distributed.

10. In the rotating electric machine according to the ninth aspect,

The core has a plurality of backing portions connected in a relative movable direction of the stator and the rotor,

The plurality of facing surfaces are selected periodically, and are integrally fixed to any one of the back yoke portions via the neck portion,

A rotating electric machine characterized in that a magnetic flux path of an armature is formed by combining a plurality of stages of the back-up portions so that all of the opposing surfaces engage with each other without excess and deficiency.

11. In the rotating electric machine according to the ninth or tenth aspect,

A rotating electric machine, wherein a plurality of the neck portions are periodically arranged in a diagonal manner with respect to a relative movable direction of a stator and a rotor.

12. In the rotating electric machine according to the ninth or tenth aspect,

The rotating electric machine, wherein the neck portions are alternately arranged left and right (staggered arrangement) when the relative movable direction of the stator and the rotor is viewed as the front-back direction.

1 3. In the rotating electric machine according to the first invention,

The core is formed by joining a powder core member formed of a composite material of a magnetic powder and an insulating member to a steel core member formed by stacking steel plates. And a rotating electric machine.

14. In the rotating electric machine according to the above thirteenth invention,

A rotating electric machine provided for the powder core structure, wherein the powder core structure is joined to both ends of the steel plate core structure in the stacking direction of the steel plates, respectively. .

15. In a rotating electrical machine having a plurality of coils formed by winding electric wires around a plurality of teeth formed on a core constituting a stator or a rotor,

16. In the rotary electric machine according to the fifteenth invention,

The core constitutes a stator, and a surface formed on the core is longer in an axial direction than a magnetic force generating portion provided on the rotor, and the electric wire is formed on both axial end surfaces of the core. A rotating electric machine, characterized in that the winding portion is depressed in a concave shape so that the length of the winding portion is shorter than the length of the magnetic force generating portion.

17. In the rotating electric machine according to the fifteenth or sixteenth invention,

1 8. In a rotating electric machine provided with a plurality of coils by winding an electric wire around a plurality of teeth formed on a core constituting a stator or a rotor,

Teeth formed on a core constituting one of the stator and the rotor have a facing surface facing the other of the stator and the rotor, A rotating electric machine, wherein a neck portion of the tooth around which an electric wire is wound is shorter than half the length of the facing surface in the axial direction of the facing surface, and is distributed.

19. In the rotating electric machine according to the eighteenth aspect,

A rotating electric machine, wherein a magnetic flux path of an armature is formed by combining a plurality of stages of the backhoe portions so that all the facing surfaces engage with each other without excess or shortage.

20. In the rotating electric machine according to the eighteenth or nineteenth invention,

21. In the rotating electric machine according to the eighteenth or nineteenth invention,

The rotating electric machine, wherein the neck portions are alternately arranged in a left-right distribution (staggered arrangement) when the relative movable direction of the stator and the rotor is viewed as the front-back direction.