CA1203557A - Cone-shaped motor - Google Patents
Cone-shaped motorInfo
- Publication number
- CA1203557A CA1203557A CA000430317A CA430317A CA1203557A CA 1203557 A CA1203557 A CA 1203557A CA 000430317 A CA000430317 A CA 000430317A CA 430317 A CA430317 A CA 430317A CA 1203557 A CA1203557 A CA 1203557A
- Authority
- CA
- Canada
- Prior art keywords
- motor
- rotor
- motors
- motor arrangement
- stator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004804 winding Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K26/00—Machines adapted to function as torque motors, i.e. to exert a torque when stalled
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Dc Machiner (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
ABSTRACT:
The invention relates to an electric motor and specially a motor arrangement comprising four such motors.
It is an object of the invention to provide a motor and a motor arrangement, respectively, which in an optimal way as regards the torque value and the motor constant value utilizes the available volume. This is obtained by a sub-stantially conical shaping of the motors and when the motor arrangement consists of four motors with the axes of rotation in a common plane, by symmetrically arranging the motors with the smaller end surfaces in pairs facing each other. The motor arrangement are useful as rudder motors at missile applications.
The invention relates to an electric motor and specially a motor arrangement comprising four such motors.
It is an object of the invention to provide a motor and a motor arrangement, respectively, which in an optimal way as regards the torque value and the motor constant value utilizes the available volume. This is obtained by a sub-stantially conical shaping of the motors and when the motor arrangement consists of four motors with the axes of rotation in a common plane, by symmetrically arranging the motors with the smaller end surfaces in pairs facing each other. The motor arrangement are useful as rudder motors at missile applications.
Description
~Z(~35~i7 PHZ 82 OO7 l 2g-12-19~2 , The invention relates to an electric motor com-prising a rotor and a stator and in particular a motor arrangement comprising ~our such electric motors, o~
which the axes o~ rotation being substantially arranged in one and the same plane~ two o~ the axes o~ rotation being substantially arranged to coincide with a ~irst coordinate axis in the plane and the other two being substantially arranged to coincide with a second coordinate axisin the plane which is rotated 9O in relation to the ~irst coordinate axis. The invention also relates to the use o~ such motor arrangements as rudder motors in missilesO
Arrangements Or this type and comprising ~our con-ventional torq~e motors are previously knownO With a conventional motor in this case is meant a motor having a oylinder-shaped rotor and a ~tator adapted thereto. A motor arrangement consisting o~ ~our such conventional motors is relatively bull~y because there is a relati.vely large space in the center of the motor arrangement which is not usedO
In some applications, ~or example as rudder motors in missiles etc., the motor arrangement occupies an inad-vantageously large par-t o~ the spaceO
Torque motors o~ the kind set ~orth have a torque which is linearly dependent on the length o~ the rotor-stator unit and approximatel~ related to the s~uare o~
its diameter~ In this connection a motor constant I~l may be de~ined as:
I~ = ~ /\ rpp where Tp is the pea~ torque and pp pec~ power input at stall conditionO
A ~irst object o~ the invention is to provide an electric motor which in an optimal way as regards the tor~ue value and the motor constant value utilizes the available space and a second object is to provide a compact 3~X~7 P~IZ ~2 OO7 -2- 29-12-1982 symmetrical motor arrangement 1~lich in an optimal way as regards the torque ~alue and the rnotor constant value utilizes the c~vailable volume.
According to the invention the ~irst object is obtained b~- an electric motor characterized in that the stator has the ~orm o~ a hollow~ tapering, and substantially rotary symmetrical bodyO
The second object is obtained by a motor arrange-ment characterized in that the motors are arranged with the thinnest part facing the intersectional point between the first and the second coordinate axis.
~ le de~ined rotary svmmetrical ~orm implies that -the volume of the stator unit may be substantially increased and that the sur~ace o~ the air gap may be considerably enlarged compared to previously known arrangements. From this follo1~s that the motors obtain a higher motor con-stane I~I
According to one embodiment o~ the invention the ro-tors o~ the motors are air journalled in order to further 20 increase the motor constant. 1~hen using air journalling the air gaps o~ the motors may be decre~sed. Thls implies a higher ~lu~ density and hence a large torque. Besides~ an increased cooling o~ the motors is obtained as an additicnal e~ect. According to another embodiment o~ the nvention the 25 magnetic poles in tangenting motors may be integrated. As a consequence the rotor diameters may be increased to pro-vide the motors with a larger torque.
The invention will now be described in more detail with re~erence to the accompanying drawing, in which F O 1 30 shows a cross section coinciding with the plane of the rotation a~es~ o~ a prior art arrangement, Fi~. 2 shows the same cross section as in Fig. 1 o~ a motor arrangement according to the invention~ Fi~ ~ schematically shows a perspective view o~ the stator comprised in the motor or 35 motor arrangement o~ the invention, viewed in perspective, Fi~u 4 schematically shows the rotor comprised in the motor or motor arrangement according to the invention, ; viewed in perspective, and Fi,~ ~ shows a cross section o~
~3SS7 PIIZ ~2 OO7 ~3~ 29-12-1982 an assembled stator and rotor~ thc area being parallel with the end sur~aces o~ the rotor and the stator.
According to the previously known embodiment shown in Fig. 1 ~our conventional torque motors l' are arranged with their aYes of rotation 4~ in one and the same planeO
The motors l' are arranged in pairs so that the axes o~
rotation 4~ o~ two motors in their prolongation coincide and so that axes o~ rotation 4' that do not coincide in their prolongation are mutually rotated 9O. In order to obtain a symmetrical motor arrangement the distance bet~een the two motors, having in their prolongation coinciding a~es o~ rotation, must as is apparent ~rom Fig. l be at least equal to the diameters of the motors l~, Each motor l' comprises a cylinder-shaped rotor 2' and a hollo~ cy-15 ~nder-shaped stator 3' adapted thereto~ An air gap 14' is present between the rotor 2' and the stator 3~ Thus, such an arrangement is rather bulky.
The ~ig. 2-5 show an embodiment o~ the motor and the motor arrangement according to the invention in which corresponding parts have the same re~erence numbers but without a prime sign.
According to -the embodiment the motor arrangement comprises ~our elec-tric motors l with their aYes o~ ro-tation 4 situated in one and the same p7ane and rotated 25 relati~e to each other as in the previously known arrange-ment. Each motor l comprises a rotor 2 and a stator 3. The rotors have a rotary symmetrical ~orm similar to a ~rustrum o~ a cone and are arranged with the mul-tilated end ~acing the center o~ the motor arrangement. The stators 3 consist o~ rotary symmetrical bodies with a ~orm similar to a hol-low ~rustrum o~ a cone and are adapted to the rotors 2.
The conical shape o~ the rotors 2 and the stators 3 and thereby the motors l themselves enables a very small dis-tance between two opposite motors, because the minimum 35 disLance substantially is determined by the diameter at the mutilated end sur~ace 7 o~ the stator 3. In order to utili~e the available space at a ma~imum the conical stator shou~d have a conical top angle o~ abou-t 9O, i.e. a conicity o~
9L2~35~7 P~IZ ~2 OO7 _4_ 29-l2-1982 about 45 . I~ the motor arrangement is arranged in a space ~ith a circular section, which is the case in missile applicatioIIs~ the sur~ace of the air gaps o~ the motors c~n be further increased by extending the rotors 2 and sta-tors 3 at the larger end surface 119 8. Thus the air gap 1can be gi~en an extension almost to a circle 16 that cir-cumscribes the motor arrangementO The extension o~ the ro-tors and the stators has been indicated by bro~en lines 15 in Figo 20 ~le conical ~our pole stator 3~ shown in Figo 3 and 5, comprises ~our permanent magnetical areas 5 extending ~rom one end sur~ace 7 to the other 8 and ~our therebetween situated areas of so~t magnetical material 6 such as steel in solid or laminated ~orm. The permanent magnetical areas l5 suitably consist o~ alnico or rare earths. Although the stator is shown in a four-pole embodiment the number o~
poles can be chosen arbitrarily. F~u-ther~ magnetical poles being a tangent to each other can be integrated. The ~our-pole stator sho~n may, ~or example, share two o~ its poles 20 l~ith adjacent stators.
The rotor~ schematically shown in Fig 4, com-prises a conical body 9 having winding groo~es~ and pre-ferably consists of a lamina-~e. Only three o~ the winding grooves 10 are shown in the Fig. 4, while the other grooves 25 have been indicated with bro~en lines. The winding grooves 10 e~tend ~rom one end sur~ace l1 i~ the conical body to the other end sur~ace 12. The winding grooves 10 are pro-vided with ~indings 13~ shown in Fig. 5, which windings pre~erably consist o~ copper, the windings being wound 30 between the end sur~aces 11~ 12 o~ the rotor. Besides, some Or the windings can be shortened and wound along the part o~ the winding grooves being situated immediately adjacent to the larger one 1l o~ the two end sur~acesO
The rotor can~ i~ required, be provided wi-th a 35 commutator o~ a conventional brush type or an electronic commutator. ~n eventual commutator may suitably be arranged at one o~ the end sur~aces 11, l2 of the rotor.
The motors can be direct current (D.C.) motors ~73~
and/or alternating current (A.C 7 ) motors and the windings can be provided on the rotor~ as sho~n in ~ig. 4, or alternatively on the stator, the rotor having then instead permanent magnets.
s
which the axes o~ rotation being substantially arranged in one and the same plane~ two o~ the axes o~ rotation being substantially arranged to coincide with a ~irst coordinate axis in the plane and the other two being substantially arranged to coincide with a second coordinate axisin the plane which is rotated 9O in relation to the ~irst coordinate axis. The invention also relates to the use o~ such motor arrangements as rudder motors in missilesO
Arrangements Or this type and comprising ~our con-ventional torq~e motors are previously knownO With a conventional motor in this case is meant a motor having a oylinder-shaped rotor and a ~tator adapted thereto. A motor arrangement consisting o~ ~our such conventional motors is relatively bull~y because there is a relati.vely large space in the center of the motor arrangement which is not usedO
In some applications, ~or example as rudder motors in missiles etc., the motor arrangement occupies an inad-vantageously large par-t o~ the spaceO
Torque motors o~ the kind set ~orth have a torque which is linearly dependent on the length o~ the rotor-stator unit and approximatel~ related to the s~uare o~
its diameter~ In this connection a motor constant I~l may be de~ined as:
I~ = ~ /\ rpp where Tp is the pea~ torque and pp pec~ power input at stall conditionO
A ~irst object o~ the invention is to provide an electric motor which in an optimal way as regards the tor~ue value and the motor constant value utilizes the available space and a second object is to provide a compact 3~X~7 P~IZ ~2 OO7 -2- 29-12-1982 symmetrical motor arrangement 1~lich in an optimal way as regards the torque ~alue and the rnotor constant value utilizes the c~vailable volume.
According to the invention the ~irst object is obtained b~- an electric motor characterized in that the stator has the ~orm o~ a hollow~ tapering, and substantially rotary symmetrical bodyO
The second object is obtained by a motor arrange-ment characterized in that the motors are arranged with the thinnest part facing the intersectional point between the first and the second coordinate axis.
~ le de~ined rotary svmmetrical ~orm implies that -the volume of the stator unit may be substantially increased and that the sur~ace o~ the air gap may be considerably enlarged compared to previously known arrangements. From this follo1~s that the motors obtain a higher motor con-stane I~I
According to one embodiment o~ the invention the ro-tors o~ the motors are air journalled in order to further 20 increase the motor constant. 1~hen using air journalling the air gaps o~ the motors may be decre~sed. Thls implies a higher ~lu~ density and hence a large torque. Besides~ an increased cooling o~ the motors is obtained as an additicnal e~ect. According to another embodiment o~ the nvention the 25 magnetic poles in tangenting motors may be integrated. As a consequence the rotor diameters may be increased to pro-vide the motors with a larger torque.
The invention will now be described in more detail with re~erence to the accompanying drawing, in which F O 1 30 shows a cross section coinciding with the plane of the rotation a~es~ o~ a prior art arrangement, Fi~. 2 shows the same cross section as in Fig. 1 o~ a motor arrangement according to the invention~ Fi~ ~ schematically shows a perspective view o~ the stator comprised in the motor or 35 motor arrangement o~ the invention, viewed in perspective, Fi~u 4 schematically shows the rotor comprised in the motor or motor arrangement according to the invention, ; viewed in perspective, and Fi,~ ~ shows a cross section o~
~3SS7 PIIZ ~2 OO7 ~3~ 29-12-1982 an assembled stator and rotor~ thc area being parallel with the end sur~aces o~ the rotor and the stator.
According to the previously known embodiment shown in Fig. 1 ~our conventional torque motors l' are arranged with their aYes of rotation 4~ in one and the same planeO
The motors l' are arranged in pairs so that the axes o~
rotation 4~ o~ two motors in their prolongation coincide and so that axes o~ rotation 4' that do not coincide in their prolongation are mutually rotated 9O. In order to obtain a symmetrical motor arrangement the distance bet~een the two motors, having in their prolongation coinciding a~es o~ rotation, must as is apparent ~rom Fig. l be at least equal to the diameters of the motors l~, Each motor l' comprises a cylinder-shaped rotor 2' and a hollo~ cy-15 ~nder-shaped stator 3' adapted thereto~ An air gap 14' is present between the rotor 2' and the stator 3~ Thus, such an arrangement is rather bulky.
The ~ig. 2-5 show an embodiment o~ the motor and the motor arrangement according to the invention in which corresponding parts have the same re~erence numbers but without a prime sign.
According to -the embodiment the motor arrangement comprises ~our elec-tric motors l with their aYes o~ ro-tation 4 situated in one and the same p7ane and rotated 25 relati~e to each other as in the previously known arrange-ment. Each motor l comprises a rotor 2 and a stator 3. The rotors have a rotary symmetrical ~orm similar to a ~rustrum o~ a cone and are arranged with the mul-tilated end ~acing the center o~ the motor arrangement. The stators 3 consist o~ rotary symmetrical bodies with a ~orm similar to a hol-low ~rustrum o~ a cone and are adapted to the rotors 2.
The conical shape o~ the rotors 2 and the stators 3 and thereby the motors l themselves enables a very small dis-tance between two opposite motors, because the minimum 35 disLance substantially is determined by the diameter at the mutilated end sur~ace 7 o~ the stator 3. In order to utili~e the available space at a ma~imum the conical stator shou~d have a conical top angle o~ abou-t 9O, i.e. a conicity o~
9L2~35~7 P~IZ ~2 OO7 _4_ 29-l2-1982 about 45 . I~ the motor arrangement is arranged in a space ~ith a circular section, which is the case in missile applicatioIIs~ the sur~ace of the air gaps o~ the motors c~n be further increased by extending the rotors 2 and sta-tors 3 at the larger end surface 119 8. Thus the air gap 1can be gi~en an extension almost to a circle 16 that cir-cumscribes the motor arrangementO The extension o~ the ro-tors and the stators has been indicated by bro~en lines 15 in Figo 20 ~le conical ~our pole stator 3~ shown in Figo 3 and 5, comprises ~our permanent magnetical areas 5 extending ~rom one end sur~ace 7 to the other 8 and ~our therebetween situated areas of so~t magnetical material 6 such as steel in solid or laminated ~orm. The permanent magnetical areas l5 suitably consist o~ alnico or rare earths. Although the stator is shown in a four-pole embodiment the number o~
poles can be chosen arbitrarily. F~u-ther~ magnetical poles being a tangent to each other can be integrated. The ~our-pole stator sho~n may, ~or example, share two o~ its poles 20 l~ith adjacent stators.
The rotor~ schematically shown in Fig 4, com-prises a conical body 9 having winding groo~es~ and pre-ferably consists of a lamina-~e. Only three o~ the winding grooves 10 are shown in the Fig. 4, while the other grooves 25 have been indicated with bro~en lines. The winding grooves 10 e~tend ~rom one end sur~ace l1 i~ the conical body to the other end sur~ace 12. The winding grooves 10 are pro-vided with ~indings 13~ shown in Fig. 5, which windings pre~erably consist o~ copper, the windings being wound 30 between the end sur~aces 11~ 12 o~ the rotor. Besides, some Or the windings can be shortened and wound along the part o~ the winding grooves being situated immediately adjacent to the larger one 1l o~ the two end sur~acesO
The rotor can~ i~ required, be provided wi-th a 35 commutator o~ a conventional brush type or an electronic commutator. ~n eventual commutator may suitably be arranged at one o~ the end sur~aces 11, l2 of the rotor.
The motors can be direct current (D.C.) motors ~73~
and/or alternating current (A.C 7 ) motors and the windings can be provided on the rotor~ as sho~n in ~ig. 4, or alternatively on the stator, the rotor having then instead permanent magnets.
s
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electric motor comprising a rotor and a stator, characterized in that the rotor has the form of a tapering substantially rotary symmetrical body, and the stator has the form of a hollow, tapering body, adapted to the rotor.
2. An electrical motor as claimed in Claim 1, char-acterized in that the rotor has the form of a frustrum of a cone with a conicity of about 45°, and the rotor has the form of a hollow frustrum of a cone.
3. An electric motor as claimed in Claim 1 or 2, characterized in that the rotor has windings that only extend along a part of the length of the rotor.
4. An electric motor as claimed in Claim 1 or 2, characterized in that the rotor is air journalled.
5. A motor arrangement comprising four electric motors of the kind claimed in Claim 1, of which the axes of rotation being substantially arranged in one and the same plane, two of the axes of rotation being substan-tially arranged to coincide with a first coordinate axis in the plane and the other two being arranged to coin-cide with a second coordinate axis in the plane which is rotated 90° in relation to the first coordinate axis, characterized in that the motors are arranged with the thinnest part facing the intersectional point between the first and the second coordinate axis.
6. A motor arrangement as claimed in Claim 5, char-acterized in that magnetic poles in tangenting stators are integrated.
7. A motor arrangement as claimed in Claim 5 or 6, characterized in that the air gap of the motors almost extend to a circle that circumscribes the motor arrange-ment.
8. Use of a motor arrangement as claimed in Claim 5 or 6 in missiles in order to independently control rudders arranged on the missile.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8203884.5 | 1982-06-23 | ||
| SE8203884A SE8203884L (en) | 1982-06-23 | 1982-06-23 | CONIC MOTOR AND ENGINE ARRANGEMENTS INCLUDING FOUR CONIC MOTORS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1203557A true CA1203557A (en) | 1986-04-22 |
Family
ID=20347153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000430317A Expired CA1203557A (en) | 1982-06-23 | 1983-06-14 | Cone-shaped motor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4628220A (en) |
| EP (1) | EP0097404B1 (en) |
| JP (1) | JPS5910161A (en) |
| CA (1) | CA1203557A (en) |
| DE (1) | DE3371146D1 (en) |
| SE (1) | SE8203884L (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100292492B1 (en) * | 1998-03-16 | 2001-06-01 | 구자홍 | Motor having deformed air-gap |
| US6455975B1 (en) * | 1999-12-03 | 2002-09-24 | Pacific Scientific Electro Kinetics Division | Regulated permanent magnet generator |
| US7884522B1 (en) | 2004-10-25 | 2011-02-08 | Novatorque, Inc. | Stator and rotor-stator structures for electrodynamic machines |
| JP3809438B2 (en) * | 2003-11-28 | 2006-08-16 | 日本サーボ株式会社 | Centrifugal blower |
| FR2873512B1 (en) * | 2004-07-22 | 2006-12-01 | Moving Magnet Tech | THREE-PHASE ELECTRIC MOTOR |
| US7061152B2 (en) | 2004-10-25 | 2006-06-13 | Novatorque, Inc. | Rotor-stator structure for electrodynamic machines |
| US7982350B2 (en) | 2004-10-25 | 2011-07-19 | Novatorque, Inc. | Conical magnets and rotor-stator structures for electrodynamic machines |
| US8471425B2 (en) | 2011-03-09 | 2013-06-25 | Novatorque, Inc. | Rotor-stator structures including boost magnet structures for magnetic regions having angled confronting surfaces in rotor assemblies |
| US9093874B2 (en) | 2004-10-25 | 2015-07-28 | Novatorque, Inc. | Sculpted field pole members and methods of forming the same for electrodynamic machines |
| US8283832B2 (en) | 2004-10-25 | 2012-10-09 | Novatorque, Inc. | Sculpted field pole members and methods of forming the same for electrodynamic machines |
| US8330316B2 (en) | 2011-03-09 | 2012-12-11 | Novatorque, Inc. | Rotor-stator structures including boost magnet structures for magnetic regions in rotor assemblies disposed external to boundaries of conically-shaped spaces |
| US8543365B1 (en) | 2004-10-25 | 2013-09-24 | Novatorque, Inc. | Computer-readable medium, a method and an apparatus for designing and simulating electrodynamic machines implementing conical and cylindrical magnets |
| US7294948B2 (en) | 2004-10-25 | 2007-11-13 | Novatorque, Inc. | Rotor-stator structure for electrodynamic machines |
| JP2007252174A (en) * | 2006-02-15 | 2007-09-27 | Venera Laboratory Co Ltd | Geared motor and planetary geared dynamo |
| US8227948B1 (en) | 2009-01-09 | 2012-07-24 | Hydro-Gear Limited Partnership | Electric motor |
| US8726490B2 (en) * | 2011-08-18 | 2014-05-20 | Glassy Metal Technologies Ltd. | Method of constructing core with tapered pole pieces and low-loss electrical rotating machine with said core |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB126340A (en) * | 1916-12-22 | 1919-05-15 | Gustave Plaisant | Improvements in and relating to Dynamo Electric Machines. |
| FR1409231A (en) * | 1963-12-13 | 1965-08-27 | Mavilor | Improvements made to electric motors with commutator |
| DE1488474A1 (en) * | 1964-12-21 | 1970-01-08 | Gaston Cartier | Electric motor |
| FR1534857A (en) * | 1967-06-19 | 1968-08-02 | Alsthom Cgee | Electric motor |
| US3558948A (en) * | 1969-02-17 | 1971-01-26 | Nikolaus Laing | Magnetic rotary machine |
| US4071794A (en) * | 1975-11-10 | 1978-01-31 | General Motors Corporation | DC motor with permanent magnet retaining structure |
| JPS52150509A (en) * | 1976-06-09 | 1977-12-14 | Matsushita Electric Ind Co Ltd | Dc micromotor |
| JPS6118638Y2 (en) * | 1977-08-23 | 1986-06-05 | ||
| AU514253B2 (en) * | 1978-10-18 | 1981-01-29 | Card-O-Matic Pty. Limited | Manufacturing punched strip for electromagnetic apparatus |
-
1982
- 1982-06-23 SE SE8203884A patent/SE8203884L/en not_active Application Discontinuation
-
1983
- 1983-06-14 CA CA000430317A patent/CA1203557A/en not_active Expired
- 1983-06-20 JP JP58109461A patent/JPS5910161A/en active Granted
- 1983-06-20 EP EP83200901A patent/EP0097404B1/en not_active Expired
- 1983-06-20 DE DE8383200901T patent/DE3371146D1/en not_active Expired
- 1983-06-23 US US06/507,205 patent/US4628220A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4628220A (en) | 1986-12-09 |
| DE3371146D1 (en) | 1987-05-27 |
| EP0097404A2 (en) | 1984-01-04 |
| EP0097404A3 (en) | 1984-10-17 |
| SE8203884D0 (en) | 1982-06-23 |
| JPH0311183B2 (en) | 1991-02-15 |
| JPS5910161A (en) | 1984-01-19 |
| EP0097404B1 (en) | 1987-04-22 |
| SE8203884L (en) | 1983-12-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |