WO2002078153A1 - Low profile motor with internal gear train - Google Patents
Low profile motor with internal gear train Download PDFInfo
- Publication number
- WO2002078153A1 WO2002078153A1 PCT/US2002/009099 US0209099W WO02078153A1 WO 2002078153 A1 WO2002078153 A1 WO 2002078153A1 US 0209099 W US0209099 W US 0209099W WO 02078153 A1 WO02078153 A1 WO 02078153A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- motor
- rotor
- disposed
- diameter
- electromagnetic machine
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/145—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having an annular armature coil
Definitions
- the present invention relates to motors generally and, more particularly, but not by way of limitation, to a novel low profile motor with an internal gear train.
- the efficiency of a stepper motor is related to the ratio of the rotor diameter to the motor diameter.
- One measurement of this ratio shows that the maximum efficiency of a stepper motor occurs at approximately 65 percent of rotor diameter to motor diameter.
- This ratio is optimized, a substantial part of the space inside the rotor of the motor is wasted.
- One approach to using this wasted space is to place a first motor coil outside the rotor and a second motor coil inside the rotor, thereby developing a low profile electric motor. Although this uses the wasted space, any gearing employed must be external to the motor, thus resulting in a package that has a total width greater than the width of the motor itself.
- an electromagnetic machine comprising: a rotor disposed in said electromagnetic machine; a stator structure disposed in said electromagnetic machine; said rotor defining a volume interiorly of said rotor; and gearing disposed in said volume, said gearing being attached to and disposed between said rotor and an output shaft of said motor.
- Figure 1 is a graph of torque versus rotor diameter for a stepper motor.
- Figure 2 is an exploded isometric view of a motor constructed according to the present invention.
- Figure 3 is an isometric view of the motor.
- Figure 4 is a side elevational view of the motor.
- Figure 5 is a front elevational view of the motor taken along line "5-5" of Figure 4.
- Figure 6 is a side elevational view, in cross-section, of the motor.
- Figure 1 taken from United States Patent No. 4,841, 189, titled STEPPER MOTOR AND METHOD OF MAKING THE SAME, is a graph of torque vs. rotor diameter for a stepper motor, showing that maximum torque is obtained at a particular rotor diameter. In this case, the maximum torque is obtained when the rotor diameter is approximately 65 percent of the motor diameter. This, of course, means that there is a large amount of wasted interior space in a conventional motor. As noted in that patent, the ratio of rotor diameter to motor diameter is preferably in the range of 55 to 75 percent.
- the present invention uses this otherwise wasted space by providing therein gearing for the motor that would normally be disposed exteriorly of the motor. While the gearing in this case is shown as being a planetary gear train, other types of gearing may be provided as well and such is within the contemplation of the present invention.
- FIG. 2 illustrates an exploded view of a motor constructed according to the present invention, the motor being generally indicated by the reference numeral 10.
- the elements of motor 10 shown on Figure 2 are described below from the lower left hand comer to the upper right hand comer.
- the first element is a ball bearing 20, then a bearing bushing 22, a front cover 24 having defined therethrough four openings, as at 26, to accommodate therein four button head screws, as at 28, an output shaft 30, an output driver disk 32, a sleeve bearing 34, three pins, as at 36, serving as shafts for three planet gears, as at 38, a sun gear 40, a motor shaft 42, a ball bearing 44, a ring gear 46, a ring gear housing 48, a bearing support 50, ball bearings 52, a rotor support 54, a rotor magnet 56, two front field rings 58, a mounting flange 60 having defined therethrough four mounting holes, as at 62, and two rear field rings 64.
- Figure 3 illustrates motor 10 with the elements thereof (Figure 2) in assembled relationship.
- Mounting holes 62 can be used to attach motor 10 to the surface of other equipment (not shown).
- Figure 4 also shows motor 10 with the elements thereof ( Figure 2) in assembled relationship.
- Figure 5 illustrates the elements of the planet gear in motor 10.
- the winding in front field ring 58 is not shown on Figure 5.
- Openings 70 are provided for alignment of the elements of motor 10 during manufacture.
- An air gap 72 is provided between field ring 58 and rotor magnet 56.
- Another air gap 80 is provided between rotor magnet support 54 and ring gear housing 48.
- Figure 6 illustrates the elements of motor 10 described above with reference to Figures 2 and 5.
- Figure 6 also shows windings 100 disposed in front and rear field rings 58 and 64, the windings not being shown on the other drawing figures.
- rotor magnet 56 is magnetically coupled to windings 100 that, in a conventional manner, impart rotational motion to the rotor magnet.
- Rotor magnet 56 is fixedly attached to rotor magnet support 54 that imparts the rotational motion to sun gear 40 through motor shaft 42.
- Rotation of sun gear 40 causes rotation of planet gears 38 around the inner surface of ring gear 46 which is fixedly disposed with respect to motor 10.
- Rotation of planet gears 38 around ring gear 46 causes rotation of output driver disk 32 by means of pins 36, which in turn causes rotation of output shaft 30 fixedly attached to the output driver disk.
- the diameter of motor 10 is about 4.6 times the thickness thereof.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002576079A JP2004527195A (en) | 2001-03-22 | 2002-03-22 | Thin or flat motor with internal gear train |
EP02725338A EP1382109A1 (en) | 2001-03-22 | 2002-03-22 | Low profile motor with internal gear train |
US10/472,133 US20040095037A1 (en) | 2002-03-22 | 2002-03-22 | Low profile motor with internal gear train |
CA002441782A CA2441782A1 (en) | 2001-03-22 | 2002-03-22 | Low profile motor with internal gear train |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US27791301P | 2001-03-22 | 2001-03-22 | |
US60/277,913 | 2001-03-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002078153A1 true WO2002078153A1 (en) | 2002-10-03 |
WO2002078153A8 WO2002078153A8 (en) | 2002-11-14 |
Family
ID=23062910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/009099 WO2002078153A1 (en) | 2001-03-22 | 2002-03-22 | Low profile motor with internal gear train |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1382109A1 (en) |
JP (1) | JP2004527195A (en) |
CA (1) | CA2441782A1 (en) |
TW (1) | TW556394B (en) |
WO (1) | WO2002078153A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1465323A2 (en) * | 2003-03-03 | 2004-10-06 | Robert Bosch Gmbh | Motor for geared motor assembly with reduced space requirements |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4691119A (en) * | 1985-06-20 | 1987-09-01 | Westinghouse Electric Corp. | Permanent magnet alternator power generation system |
US4755700A (en) * | 1985-04-01 | 1988-07-05 | Tian Yongning | Variable speed AC motor |
US6198182B1 (en) * | 1998-09-02 | 2001-03-06 | Cts Corporation | Two-phase stepper motor having two disk stators with salient poles positioned on either side of two disk rotors |
-
2002
- 2002-03-21 TW TW91105437A patent/TW556394B/en not_active IP Right Cessation
- 2002-03-22 EP EP02725338A patent/EP1382109A1/en not_active Withdrawn
- 2002-03-22 WO PCT/US2002/009099 patent/WO2002078153A1/en not_active Application Discontinuation
- 2002-03-22 CA CA002441782A patent/CA2441782A1/en not_active Abandoned
- 2002-03-22 JP JP2002576079A patent/JP2004527195A/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4755700A (en) * | 1985-04-01 | 1988-07-05 | Tian Yongning | Variable speed AC motor |
US4691119A (en) * | 1985-06-20 | 1987-09-01 | Westinghouse Electric Corp. | Permanent magnet alternator power generation system |
US6198182B1 (en) * | 1998-09-02 | 2001-03-06 | Cts Corporation | Two-phase stepper motor having two disk stators with salient poles positioned on either side of two disk rotors |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1465323A2 (en) * | 2003-03-03 | 2004-10-06 | Robert Bosch Gmbh | Motor for geared motor assembly with reduced space requirements |
EP1465323A3 (en) * | 2003-03-03 | 2006-09-06 | Robert Bosch Gmbh | Motor for geared motor assembly with reduced space requirements |
Also Published As
Publication number | Publication date |
---|---|
JP2004527195A (en) | 2004-09-02 |
EP1382109A1 (en) | 2004-01-21 |
TW556394B (en) | 2003-10-01 |
WO2002078153A8 (en) | 2002-11-14 |
CA2441782A1 (en) | 2002-10-03 |
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