JP2009065823A - Permanent magnet motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synchronous permanent magnet motor that is high in input/output efficiency while reducing copper loss in the coil. <P>SOLUTION: A permanent magnet motor is provided with a yoke part 5, in which a stator 4 is formed into an almost cylindrical shape, and a plurality of main-pole parts and interpole parts 7 that are alternately arranged and provided protrusively from the yoke part 5 toward the inside while being separated by a prescribed distance in a circumferential direction of the yoke part 5. Each main-pole part is wound with a coil 11 while each interpole part 7 is not wound with the coil 11. A circumferential width of an interpole tooth part 7a of each interpole part 7 is formed smaller than that of a main-pole tooth part 6a of each main-pole part. A lamination length of each interpole tooth part 7a is larger than that of each main-pole tooth part 6a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a permanent magnet motor, and more particularly to a permanent magnet motor including a stator in which a main pole portion around which a coil is wound and an auxiliary pole portion around which no coil is wound are alternately arranged.

  In a synchronous permanent magnet motor in which a plurality of salient poles are formed on a stator and a multi-layer (U, V, W phase) coil is wound around the salient poles in a concentrated manner, in order to improve the input / output efficiency of the motor It is effective to reduce the copper loss caused by the current flowing through the copper coil. As one means for reducing the copper loss of the coil, it is known to use a coil having a large wire diameter to reduce the resistance of the coil. However, in order to wind a coil with a large wire diameter around the salient pole with the same number of turns, it is necessary to increase the area of the slot formed between the salient poles. In order to increase the slot area without increasing the outer diameter of the stator, it is necessary to reduce the width of the tooth portion around which the coil is wound.

  However, when the width of the tooth portion is reduced, the cross-sectional area of the tooth portion is reduced, the density of magnetic flux flowing from the magnet into each tooth portion is increased, the magnetic flux is saturated, and the effective magnetic flux is reduced. When the magnetic flux is saturated and the effective magnetic flux decreases, the driving torque that is important for the motor performance is reduced. Therefore, a configuration is required in which the slot area is increased without reducing the cross-sectional area of the tooth portion.

In recent years, a synchronous permanent magnet motor has been proposed in which the salient poles of the stator are divided into a main pole portion and an auxiliary pole portion, and the main pole portion and the auxiliary pole portion are alternately arranged, and a coil is wound only on the main pole portion. (See Patent Document 1). In this permanent magnet motor, since the coil is wound only on the main pole portion, the time and cost required for winding the coil can be reduced. Further, since the coil is wound only on the main pole portion, there is an auxiliary pole portion between adjacent coils, and the coils are not in direct contact with each other. Therefore, the insulation performance of each coil is improved.
JP-A-2005-12986

  In order to improve the motor input / output efficiency even in the permanent magnet motor having the stator in which the main pole portion and the auxiliary pole portion are alternately arranged and the coil is wound only on the main pole portion, a coil with a large wire diameter is used. It is desirable to increase the slot area so that can be wound around the main pole. However, as with a general synchronous permanent magnet motor, if the width of each tooth portion is reduced in order to increase the slot area, the magnetic flux flowing from the magnet to each tooth portion will be saturated, resulting in a drive torque. Cause a decline. Therefore, even in a synchronous permanent magnet motor in which main pole portions and auxiliary pole portions are alternately arranged, a stator having a large slot area without reducing the cross-sectional area of each tooth portion is desired so as not to saturate magnetic flux.

  Accordingly, an object of the present invention is a synchronous permanent magnet motor including a stator in which a main pole portion around which a coil is wound and an auxiliary pole portion around which no coil is wound is alternately arranged, and each tooth portion Another object of the present invention is to provide a synchronous permanent magnet motor including a stator having salient poles that can increase the slot area without reducing the cross-sectional area.

  In order to solve the above problems, the present invention provides a stator formed by laminating cores made of a plurality of thin magnetic materials, a substantially cylindrical shape made of a magnetic material, and a magnet on an outer peripheral surface. A permanent magnet motor comprising a rotor rotatably disposed inside the stator, wherein the stator includes a yoke portion formed in a substantially cylindrical shape, and a circumferential direction of the yoke portion. Permanently provided with a plurality of main electrode parts and auxiliary electrode parts that are arranged in a projecting manner from the yoke part apart from each other by a predetermined distance and are alternately arranged, and a coil wound around the main electrode part. In the magnet motor, the circumferential width T2 of the complementary teeth portion of the complementary pole portion protruding from the yoke portion is larger than the circumferential width T1 of the main pole teeth portion of the main pole portion around which the coil is wound. It is formed small and the stacking length L2 of the complementary teeth portion It is formed larger than the stacked length L1 of the main pole teeth.

  As described above, the circumferential width of the teeth portion of the auxiliary pole portion is made smaller than the circumferential width of the teeth portion of the main pole portion, the slot area is increased, and the stacking length of the auxiliary pole portion is increased. It is longer than the stacking length to prevent a reduction in the cross-sectional area of the tooth portion of the auxiliary pole portion, and to prevent saturation of magnetic flux in the tooth portion of the auxiliary pole portion.

  In the present invention, a stator having a shape capable of increasing the slot area without reducing the cross-sectional area of the tooth portion can be configured, so that a coil having a large wire diameter can be wound around the main pole portion. It is possible to provide a synchronous permanent magnet motor that can reduce the copper loss caused by the current flowing through the coil, does not cause magnetic flux saturation, and has improved input / output efficiency.

  Hereinafter, the permanent magnet motor which is the 1st Embodiment of this invention is demonstrated based on FIGS. 1-7. FIG. 1 is a side view of a permanent magnet motor according to a first embodiment of the present invention, and FIG. 2 is a front view. FIG. 3 is a cross-sectional view of section AA indicated in FIG. FIG. 4 is a cross-sectional view taken along the line BB indicated in FIG.

  The permanent magnet motor 1 is disposed between a front bracket 13 formed in a substantially disc shape, an end bracket 14 also formed in a substantially disc shape, and between the front bracket 13 and the end bracket 14. And a stator case 15 that is thin and formed in a substantially cylindrical shape. The front bracket 13 is provided with a shaft insertion hole 13a, and the shaft 16 is inserted through the shaft insertion hole 13a and protrudes outside the front bracket 13. An encoder 24 is attached to the end bracket 14, and a signal line 23 is drawn out from the encoder 24.

  Inside the stator case 15, the stator 4 including the stator core laminated body 200 and the main pole core laminated body 300 is disposed. The stator core laminate 200 is formed by laminating a plurality of thin stator cores 2 made of a magnetic material, and the main pole core laminate 300 is formed by laminating a plurality of thin main pole cores 3 made of a magnetic material. The stator 4 has a yoke portion 5 formed in a substantially annular shape, and 6 formed by alternately projecting inward from the yoke portion 5 at equal intervals in the circumferential direction of the yoke portion 5. The main pole part 6 and the auxiliary pole part 7 are comprised.

  The auxiliary pole part 7 is formed integrally with the yoke part 5, and the auxiliary pole tooth part 7 a protruding from the yoke part 5 and the auxiliary pole extension extending to both sides in the circumferential direction at the tip of the auxiliary pole tooth part 7 a It consists of a protruding portion 7b. Moreover, the recessed part 5a for the set bolt 12 to penetrate is provided in the outer periphery of the yoke part 5 from which the auxiliary pole part 7 protrudes.

  The main pole part 6 disposed between the adjacent auxiliary pole parts 7 is constituted by a main pole core laminated body 300 formed separately from the yoke part 5. The main pole portion 6 includes a substantially rectangular main pole tooth portion 6 a around which the coil 11 is wound, and a taper convex portion 6 c that is press-fitted into the reverse taper concave portion 5 b of the yoke portion 5. At the tip of each main electrode teeth portion 6a of the main electrode portion 6, main electrode extension portions 6b extending to both sides in the circumferential direction are formed.

  The insulator 19 is mounted on the outer peripheral surface of the main electrode teeth portion 6 a in advance, the coil 11 is wound from the outer peripheral surface of the insulator 19, and the six main electrode core stacks 300 on which the coils 11 are wound are connected to the stator core stack 200. It arrange | positions inside and presses the taper convex part 6c in the reverse taper recessed part 5b. As a result, the main electrode core laminate 300 is integrally fixed to the stator core laminate 200. As a result, the stator 4 including the six main pole portions 6 around which the coil 11 is wound and the six auxiliary pole portions 7 around which the coil 11 is not wound is formed.

  The rotor 8 is composed of a shaft 16 formed of a magnetic material in a substantially cylindrical shape, and a first ring magnet 9 and a second ring magnet 10 formed in the same cylindrical shape. The first and second ring magnets 9 and 10 are neodymium magnets and are magnetized so that there are 10 N poles and 10 S poles alternately in the circumferential direction. The first and second ring magnets 9 and 10 are coated with an adhesive on the inner peripheral surface, and the first and second ring magnets 9 and 10 are in contact with the magnet abutting portion 16 c of the shaft 16. The ring magnets 9 and 10 are bonded and fixed to the shaft 16 by a magnet fixing portion 16b.

  Each of the insulators 19 is provided with two coil binding pins 20, and terminals (not shown) formed on the power base 21 on the 12 coil binding pins 20 arranged on the stator 4 are soldered. The power base 21 is fixed to the stator 4. An adhesive is applied to the outer peripheral surface of the stator 4, and the stator 4 is bonded and fixed on the inner peripheral surface of the stator case 15. In addition, the arrangement of a distribution pattern (not shown) for supplying power to each coil 11 of the power base 21 is such that each coil 11 of the six main pole portions 6 arranged in the circumferential direction has a U phase, a V phase, and a W in order. Phase, U phase, V phase, and W phase are set.

  The inner ring 17a of the front bearing 17 is press-fitted and fixed to the front bearing inner ring holding part 16d of the shaft 16, and the inner ring 18a of the end bearing 18 is press-fitted and fixed to the end bearing inner ring holding part 16e. The outer ring 17 b of the front bearing 17 is inserted and fixed to the front bearing outer ring holding portion 13 c of the front bracket 13, and the outer ring 18 b of the end bearing 18 is press-fitted and fixed to the end bearing outer ring holding portion 14 b of the end bracket 14.

  The inner peripheral convex front bracket fitting portion 15 a of the stator case 15 is inserted into the inner peripheral concave opening portion 13 b of the front bracket 13, and the inner peripheral convex end bracket fitting portion 15 b is inserted into the inner peripheral concave opening portion 14 c of the end bracket 14. The front bracket 13 and the end bracket 14 are disposed at both ends of the stator case 15. Here, the front bracket 13 and the end bracket 14 disposed at both ends of the stator case 15 by the set bolt 12 are sandwiched.

  The stator 4 is bonded and fixed to the stator case 15, and the stator 4 is disposed at a predetermined position inside the permanent magnet motor 1. Further, the rotor 8 is pivotally supported by the front bracket 13 and the end bracket 14 by the front bearing 17 and the end bearing 18, and is disposed rotatably at a predetermined position inside the stator 4. Further, the power line 22 from the power base 21 is drawn out from the end bracket 14 and connected to a driver device (not shown).

  A substantially disk-shaped encoder ring 24b is attached to the rear protrusion 16f that protrudes outward from the end bracket 14. Further, the optical sensor 24c is disposed so as to face the outer peripheral portion of the encoder ring 24b, and is attached to the sensor holding portion 24e. The sensor holding portion 24e is attached to the sensor holding portion mounting surface 14d of the end bracket 14. A scale 24d for detecting a rotation angle is provided on the outer periphery of the encoder ring 24b. In order to protect the encoder 24 from external dust and the like, an encoder cover 24 a is attached to the encoder cover mounting surface 14 a of the end bracket 14 so as to cover the encoder 24. A signal line 23 from the optical sensor 24c is drawn out from the encoder cover 24a and connected to a driver device (not shown).

  The driver device (not shown) controls the power supplied to each coil 11 so that the permanent magnet motor 1 is driven at a predetermined number of rotations based on the rotation information obtained from the optical sensor 24 c, and the permanent magnet is connected through the power line 22. A current is supplied to the motor 1.

  Next, the structure of the stator core laminated body and main pole core laminated body of the permanent magnet motor according to the embodiment of the present invention will be described in detail with reference to FIGS. FIG. 5 is a front view of the stator core laminate and the main pole core laminate of the permanent magnet motor according to the embodiment of the present invention. 6 is a cross-sectional perspective view of the cross-section CC indicated in FIG. Further, the axial distribution of the flow of magnetic flux from the first and second ring magnets to the auxiliary pole portion will be described with reference to FIG. FIG. 7 is an enlarged view of a portion (P) showing the first and second ring magnets and the auxiliary pole part in FIG. 4, and is a diagram showing the flow of magnetic flux.

  The circumferential width T2 of the complementary pole teeth portion 7a is set smaller than the circumferential width T1 of the main pole teeth portion 6a. In this embodiment, T2: T1 is 5/6 (≈0.83). : 1 is set. Further, the stacking length L2 of the stator core laminate 200 having the stacking length L2 of the auxiliary pole portion 7 is greater than the stacking length L1 of the main pole core stacking 300 being the stacking thickness L1 of the main pole portion 7. Is also set larger. In the present embodiment, L2: L1 is set to 6/5 (= 1.2): 1.

  Thus, by reducing the circumferential length T2 of the auxiliary pole teeth portion 7a, the area of the slot S surrounded by the adjacent auxiliary pole teeth portion 7a, the main electrode teeth portion 6a, and the yoke portion 2 connecting them is as follows. To increase. For this reason, the coil 11 inserted inside the slot S is selected to have a large wire diameter, the resistance value of the coil 11 is reduced, and the copper loss generated in the coil 11 is reduced.

  The circumferential length W2 of both ends of the complementary pole extending portion 7b of the complementary pole tooth portion 7a facing the first and second ring magnets 9 and 10 and the circumference of both ends of the main pole extending portion 6b of the main pole tooth portion 6a. The direction length W1 is set to be substantially the same, and as a result, when viewed in the circumferential direction, the magnetic flux having the same magnetic flux flows into the main pole tooth portion 6a and the auxiliary pole tooth portion 7a.

  The circumferential width T2 of the auxiliary pole teeth portion 7a of the permanent magnet motor 1 is set to be smaller than the circumferential width T1 of the main pole teeth portion 6a, and the circumferential magnetic resistance of the auxiliary pole teeth portion 7a is the main pole teeth. Although it becomes larger than the magnetic resistance in the circumferential direction of the portion 6a, as shown in FIG. 4, the axial length of the first and second ring magnets 9 and 10 is larger than the accumulated thickness L1 of the main pole portion 6. L3 is large, and as shown in FIG. 7, the product thickness L2 of the auxiliary pole portion 7 is larger than the axial length L3 of the first and second ring magnets 9 and 10 (L2> L3). The magnetic flux from the first ring magnet 9 is dispersed in the axial direction and flows to the complementary tooth portion 7a. As a result, when viewed in the axial direction, the magnetic flux having the same magnetic flux amount can flow into the main pole tooth portion 6a and the auxiliary pole tooth portion 7a. Therefore, the magnetic flux flowing through the main pole portion 6 flows to the auxiliary pole portion 7 without leaking from the auxiliary pole tooth portion 3a.

  Further, the stator core laminate is formed such that the cross-sectional area A2 (= T2 × L2) of the complementary electrode tooth portion 7a is substantially the same (A2 = A1) as the cross-sectional area A1 (= T1 × L1) of the main electrode tooth portion 6a. The stacking length L2 of 200 is set to be larger than the stacking length L1 of the main pole core laminate 300. Thereby, although the circumferential width T2 of the complementary pole teeth portion 7a is narrower than the circumferential width T1 of the main pole teeth portion 6a, the complementary teeth portion 7a and the main pole teeth portion 6a as described above. The effective magnetic flux amount of the magnetic flux flowing through the first and second ring magnets 9 and 10 flows from the first and second ring magnets 9 and 10 to the main pole portion 6 and the auxiliary pole portion 3, and the amount of the magnetic flux flowing through both is substantially the same. Even in this case, the magnetic flux does not saturate at the complementary tooth portion 7a.

  As described above, the stacking length L1 of the main electrode portion 6 is set to be smaller than the stacking length L2 of the auxiliary electrode portion 7. In the present embodiment, the main pole portion 6 is arranged to be offset in the axial direction with respect to the auxiliary pole portion 7, and the first end 6 d of the main pole portion 6 is the first end of the auxiliary pole portion 7. It is set to be disposed in substantially the same plane as the end 7d. By being arranged in this way, the distance from the second end portion 6e of the main pole portion 6 to the power base 21 can be increased, a large space for arranging the coil 11 can be secured, and the wire diameter The thick coil 11 can be selected.

  In the present embodiment, T2: T1 = 5/6: 1 and L2: L1 = 6/5: 1 are set, but it is needless to say that the values are not limited to such values. Even if it is the stator core laminated body 200 and the main pole core laminated body 300 which become any value of the range of T1 = 0.7-0.9: 1, L2: L1 = 1.1-1.5: 1, The effects of the present invention can be sufficiently exhibited.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the second embodiment is different from the first embodiment in the structure of the auxiliary pole portion 7, and the other portions are substantially the same. Therefore, the structure of the complementary electrode part 7 will be described in detail, and the description of the other parts will be omitted. In the first embodiment, when the axial length of the auxiliary pole portion 7 is extended with respect to the main pole portion 6, the axial length of the cylindrical yoke portion 5 in which the auxiliary pole portion 7 is integrally formed is also extended. . In the extended yoke portion 5, magnetic flux from the magnet does not flow, and there is an unnecessary portion as a magnetic path. Therefore, in the second embodiment, the weight of the stator 4 is reduced by reducing the yoke portion 5 that is unnecessary as the magnetic path.

  FIG. 8 is a perspective view of a divided auxiliary pole used in the second embodiment, and FIG. 9 is a perspective view of a stator using the divided auxiliary pole teeth. Similarly to the first embodiment, the divided auxiliary pole 7c is formed by laminating a plurality of thin cores each having an auxiliary tee part 7a having a width T2 and an auxiliary electrode extending part 7b having a circumferential length W2 at both ends. It is a thing. In addition, the product thickness of the divided auxiliary pole portion 7c in which a plurality of thin cores are stacked is L3.

  In 1st Embodiment, since the auxiliary pole part 7 and the yoke part 5 were piled up so that it might become longer than the axial length of the stator core 2 and the main pole part 6 which were formed integrally, the yoke part unnecessary as a magnetic path 5 was supposed to exist. Therefore, in the second embodiment, the stator core 2 in which the auxiliary pole portion 5 and the yoke portion 5 are integrally formed is stacked until the axial length is the same as the axial length of the main pole portion 6. The divided auxiliary pole portion 7c is fixedly disposed on the end face of the formed auxiliary pole portion 5 of the stator 4. Here, the fixed arrangement of the divided auxiliary pole portion 7c to the stator 4 is by adhesion, but is not limited to adhesion, and may be welding, boss caulking, or the like.

  By fixing the divided auxiliary pole portion 7c having the laminated length L3 to the stator 4 with respect to the laminated length L1 of the main electrode portion 6, the laminated length of the auxiliary pole portion 7 becomes L2, which is the same as in the first embodiment. In addition, the cross-sectional areas of the main electrode teeth portion 6a and the auxiliary electrode teeth portion 7a are substantially the same, and the magnetic flux does not saturate in the auxiliary electrode teeth portion 7a having a narrow width. FIG. 10 illustrates the flow of magnetic flux from the first and second ring magnets 9, 10 to the divided auxiliary pole portion 7 c and the auxiliary pole portion 7. The magnetic flux that has flowed into the divided auxiliary pole portion 7 c flows to the auxiliary pole portion 7 and flows to the yoke portion 5.

  Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is different from the second embodiment only in the structure of the divided auxiliary pole part, and the other parts are substantially the same. Therefore, the structure of the divided auxiliary pole part will be described in detail, and the description of the other parts will be omitted. In the second embodiment, the cores having the same shape are stacked to form the divided auxiliary pole portion 7c. Therefore, as shown in FIG. 10, there is a portion where the magnetic flux does not flow in a portion away from the first ring magnet 9 in the upper portion (upper portion of the paper) of the divided auxiliary pole portion 7 c. Therefore, in the third embodiment, by reducing unnecessary portions as the magnetic path, the divided auxiliary pole portion is reduced in weight.

  FIG. 11 is a perspective view of a divided auxiliary pole portion according to the third embodiment, and FIG. 12 is a perspective view of a stator using the divided auxiliary pole teeth. The divided auxiliary pole 7d is formed by pressing a soft magnetic material powder in a mold. Similarly to the first embodiment, the divided complementary pole 7d includes a complementary tee portion 7a having a width T2 and a complementary pole extending portion 7b having a circumferential length W2 at both ends, and the length of the upper surface (upper portion of the paper). And L4, and an inclined portion 7e having a length of the lower surface (lower portion of the paper) as L5 (L4 <L5). The stator 4 according to the third embodiment also has a structure in which the divided complementary pole portion 7d is fixedly disposed on the end surface of the complementary pole portion 5 as in the second embodiment. Here, the fixed arrangement of the divided auxiliary pole portion 7d to the stator 4 is by adhesion, but is not limited to adhesion, and may be welding or the like.

  FIG. 13 illustrates the flow of magnetic flux from the first and second ring magnets 9, 10 to the divided auxiliary pole portion 7 d and the auxiliary pole portion 7. The magnetic flux that has flowed into the divided auxiliary pole portion 7c flows to the auxiliary pole portion 7 and flows to the yoke portion 5, but the upper portion (upper portion of the paper) where no magnetic flux flows through the divided auxiliary pole portion 7c. Since the portion away from 9 is not formed, the divided auxiliary pole portion 7d is reduced in weight without hindering the flow of magnetic flux.

1 is a side view of a permanent magnet motor according to a first embodiment of the present invention. It is a front view of the permanent magnet motor of a 1st embodiment of the present invention. It is sectional drawing of the cross section AA instruct | indicated in FIG. It is sectional drawing of the cross section BB instruct | indicated in FIG. It is a front view of the stator core laminated body and main pole core laminated body of the permanent magnet motor of the 1st Embodiment of this invention. FIG. 6 is a sectional perspective view of a section CC indicated in FIG. 5. FIG. 5 is an enlarged view of a part (P) showing first and second ring magnets and an auxiliary pole part in FIG. 4. It is a perspective view of the division | segmentation supplementary tooth part of the 2nd Embodiment of this invention. It is a perspective view of the stator of the 2nd Embodiment of this invention. It is a figure which shows the flow of the magnetic flux in the stator of the 2nd Embodiment of this invention. It is a perspective view of the division | segmentation supplementary tooth part of the 3rd Embodiment of this invention. It is a perspective view of the stator of the 3rd Embodiment of this invention. It is a figure which shows the flow of the magnetic flux in the stator of the 3rd Embodiment of this invention.

Explanation of symbols

1 Permanent magnet motor 2 Stator core (core)
200 Stator core laminate 3 Main pole core 300 Main pole core laminate 4 Stator 5 Joint portion 6 Main pole portion 6a Main pole teeth portion 6b Main pole extension portion 7 Supplement pole portion 7a Supplement pole teeth portion 7b Supplement pole extension portion 8 Rotor 9 First ring magnet (magnet)
10 Second ring magnet (magnet)
11 Coil

Claims (6)

A stator formed by laminating cores made of a plurality of thin magnetic materials, and a substantially cylindrical shape made of a magnetic material, provided with a magnet on the outer peripheral surface, and rotatably disposed inside the stator. A permanent magnet motor comprising a rotor and
The stator has a yoke portion formed in a substantially cylindrical shape, and a plurality of alternately arranged protrusions inward from the yoke portion spaced apart by a predetermined interval in the circumferential direction of the yoke portion. In a permanent magnet motor provided with a main pole part and an auxiliary pole part, and a coil wound around the main pole part,
The circumferential width T2 of the complementary teeth portion of the complementary pole portion protruding from the yoke portion is formed smaller than the circumferential width T1 of the main pole teeth portion of the main pole portion around which the coil is wound, A permanent magnet motor characterized in that the laminated length L2 of the complementary electrode tooth portion is formed to be larger than the laminated length L1 of the main electrode tooth portion. A stator formed by laminating cores made of a plurality of thin magnetic materials, and a substantially cylindrical shape made of a magnetic material, provided with a magnet on the outer peripheral surface, and rotatably disposed inside the stator. A permanent magnet motor comprising a rotor and
The stator has a yoke portion formed in a substantially cylindrical shape, and a plurality of alternately arranged protrusions inward from the yoke portion spaced apart by a predetermined interval in the circumferential direction of the yoke portion. A stator core laminated body in which the yoke portion and the complementary electrode portion are integrally formed, and the stator includes a coil wound around the main pole portion, and the stator, In a permanent magnet motor that forms a main pole portion and includes a plurality of main pole core laminates coupled to the stator core laminate,
The circumferential width T2 of the complementary teeth portion of the complementary pole portion of the stator core laminate is formed smaller than the circumferential width T1 of the main pole teeth portion of the main pole core laminate around which the coil is wound. The permanent magnet motor is characterized in that a lamination length L2 of the stator core laminate is formed to be larger than a laminate length L1 of the main pole core laminate.   3. The permanent magnet motor according to claim 1, wherein the lamination length L <b> 2 is formed to be larger than the axial length L <b> 3 of the magnet.   4. The permanent magnet motor according to claim 1, wherein the main pole portion is arranged to be offset in the axial direction with respect to the auxiliary pole portion. 5.   5. The permanent magnet motor according to claim 4, wherein the first end of the main pole portion of the stator is disposed substantially in the same plane as the first end of the auxiliary pole portion. Permanent magnet motor. The permanent magnet motor according to any one of claims 1 to 5, wherein the stator includes a main pole extension portion extending to both sides in the circumferential direction at a tip of the main pole teeth portion of the main pole portion, and the auxiliary pole portion of the auxiliary pole portion. A permanent magnet motor comprising an auxiliary pole extending portion extending at both ends in the circumferential direction at the tip of the pole teeth portion and having a circumferential length substantially the same as the circumferential length of the main pole extending portion. .

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