JP4767579B2 - Electric motor stator - Google Patents

Description

  The present invention relates to a stator of an electric motor using a concentrated winding method in which a resin bobbin is mounted on a stator tooth portion and a winding is directly wound.

  In recent years, electric vehicles equipped with electric motors driven at a low voltage are increasing due to environmental problems and the like. Such an electric motor stator is required to be a highly efficient electric motor with a small loss from the viewpoint of vehicle mounting space and from the viewpoint of energy saving. The winding wound around the stator in response to these requirements has a thick wire diameter and a small number of windings. For such a winding specification, a concentrated winding method in which the winding is wound directly around the teeth of the stator is suitable. As a result, the winding height of the winding protruding from the stator can be reduced, and the copper loss generated by the winding can be reduced.

  Specific motor specifications include a motor having a voltage of 60 V or less and a driving operation range of 15000 r / min or less.

  In such an electric motor, as shown in Japanese Patent Application Laid-Open No. 11-122855 (see Patent Document 1), an insulating plate is integrally provided on the flange portion of the resin bobbin so as to be bent, and the tip of the tooth portion of the stator An insulating resin bobbin having a step or an inclined surface having an angle of about 60 degrees is used inside the flange. Thereby, the winding wound around the tooth portion of the stator can be wound in an aligned manner, and the space factor in the slot can be increased.

JP 11-122855 A

  For example, when winding a wire with a large wire diameter around such a low voltage motor around a resin bobbin, the winding becomes thick and the degree of freedom of the winding is lost. In particular, in the concentrated winding method in which the winding is directly wound around the teeth of the stator, the adjacent windings are in contact with each other because the adjacent poles have different polarities. In view of this, an insulating material provided with a step portion for winding guide or an inclined surface having an angle of about 60 degrees inside the collar portion that becomes the tip of the tooth portion so that the winding can be aligned and wound around the resin bobbin. Resin bobbins are used. However, these resin bobbins have an effective structure in the stator of a concentrated winding motor in which the winding directions of the windings of adjacent tooth portions are wound in the same direction, but are wound around the adjacent tooth portions. When the winding direction of the winding is different, it is possible to reliably perform aligned winding by simply providing a stepped portion for winding guide or an inclined surface having an angle of about 60 degrees on the inner side of the collar portion that becomes the tip of the tooth portion. It is difficult to realize.

  Specifically, when winding the winding around the resin bobbin, if the winding direction of the winding wound around the teeth of all the stators is constant, the movement of the winding from the first stage to the second stage is not performed. The step part or the slope part with an angle of about 60 degrees allows smooth movement and can be wound in an aligned winding. If the winding direction of the winding differs between adjacent tooth parts, one tooth part In the winding direction of the winding, as described above, the movement from the first stage to the second stage of the winding is performed by the step part for winding guide or 60 on the inner side of the collar part which is the tip of the tooth part. The winding part can move smoothly and can be aligned and wound by the inclined part that forms an angle of about 5 degrees, but in the other tooth part where the winding direction is reverse, the inside of the collar part that becomes the tip of the tooth part Just by providing a step part for winding guide or a slope part that forms an angle of about 60 degrees Movement of the winding becomes a fat winding become a turbulent wound not be performed smoothly. Therefore, the windings wound around the tooth portions having adjacent poles come into contact with each other, resulting in poor insulation, or the space factor of the windings wound in the slots of the stator cannot be increased. In addition, the height of the coil end is increased, making it difficult to reduce the size and performance of the motor.

  Also, if you try to wind the winding too small, the winding wire diameter is large and the flexibility is poor, so the winding will be pulled tightly and wound around the teeth of the stator, causing the winding itself to be damaged or damaged. Or cause insulation failure. Further, the resin bobbin itself is damaged by pulling the winding strongly, or the laminated core is deformed.

  In view of this, the present invention is a stator of an electric motor using a winding having a particularly low voltage and a large wire diameter, and the electric motor in which the winding direction of the winding is wound in the opposite direction between adjacent teeth. As a stator of an electric motor using a resin bobbin that can wind as many windings as possible by winding the windings in alignment with the teeth of the stator, and winding the windings small to reduce copper loss Yes. In addition, there is no contact between the windings, and there is little damage or damage to the windings. By the way, the stator of the motor has improved quality with little damage and deformation of the insulating bobbin and laminated core. Yes.

According to the present invention for solving the problem, the teeth of the stator of the electric motor are arranged in an annular shape, a resin bobbin is mounted on the teeth, a winding is concentrated on the resin bobbin, The winding direction of the stator of the motor wound in the opposite direction at the tooth portions adjacent to each other is such that the winding is shifted by approximately ½ pitch on the inner surface of the slot of the resin bobbin . corner protrusions are provided for the bale loading and regular winding in,
The corner protrusion is provided at a position where the side surface of the slot inner tooth and the side surface of the bottom of the slot of one of the resin bobbins attached to the tooth portions adjacent to each other intersect, The stator of the electric motor is provided at a position where the side surface of the tooth portion intersects the side surface of the opening portion in the slot on the slot opening side.

As a result, the total cross-sectional shape of the winding wound around the adjacent tooth portions can be made uneven, and the windings can be wound in an aligned manner without interfering with each other, while keeping the insulation distance close. It can be used as a motor stator.

  In addition, by using the stator core in which the stator of the motor is divided as an annularly arranged stator, the windings wound around the adjacent tooth portions can be easily aligned and wound. This is a stator of an electric motor that can wind many windings while keeping the insulation distance between the windings wound around adjacent tooth portions to a minimum.

  When the number of slots of the stator arranged in a ring is N (N is an even number), when the number of magnetic poles generated by the stator winding is N-2, the stator is wound around adjacent teeth. The stator of the motor is wound around the winding direction in the opposite direction. For example, the number of stator slots is 12 and the number of magnetic poles generated by the stator winding is 10 poles (the rotor magnetic pole number is N ± 2 and 10 or 14 poles), or the stator The number of slots is 18 and the number of magnetic poles generated by the winding of the stator is 16 (the number of magnetic poles of the rotor is N ± 2, which is 16 or 20).

  Furthermore, the wire diameter of the winding wound around the stator of the electric motor according to the present invention can be aligned and wound with a thick wire diameter of φ0.85 to φ2.5, so that the motor stator can be improved in quality and performance. be able to.

  Further, by using the stator of the motor of the present invention for a low-voltage motor for mounting on a vehicle, the windings of the stator are aligned and wound, so that many windings can be wound, and the motor performance can be improved. In addition, it is possible to provide a stator for an electric motor having improved quality without damage and deformation of the bobbin for insulation and the laminated core without damage and damage to the winding.

In the present invention, the teeth of the stator of the electric motor are arranged in an annular shape, a resin bobbin is mounted on the teeth, the winding is concentrated on the resin bobbin, and the winding direction of the winding is adjacent to each other. In a stator of an electric motor wound in a reverse direction at a tooth portion, the winding is stacked on the inner side surface of the slot of the resin bobbin so that the winding is shifted by about 1/2 pitch of the wire diameter of the winding to make an aligned winding. The corner protrusion is provided at a position where the side surface of the slot inner tooth and the side surface of the bottom of the slot of one tooth of the resin bobbin attached to the adjacent tooth portions intersect each other. The other tooth part is a stator of an electric motor provided at a position where the side surface of the slot inner tooth part intersects with the side surface of the slot opening side on the slot opening side, so that one of the coils wound around the tooth part of the resin bobbin the total cross section of the tooth of the winding can be a concave shape, It is possible to square the total cross-sectional shape of the teeth in winding the windings of a convex shape, it can be a total cross-sectional shape of the wound winding teeth next to each other with irregularities, interfere with each other Without winding, the windings can be aligned and kept close together while maintaining the insulation distance.

  In addition, by using the stator core in which the stator of the motor is divided for the stator of the motor arranged in a ring shape, the windings wound around the adjacent tooth portions can be easily aligned and wound. It can be set as the stator of the electric motor which can wind many coil | windings, keeping the insulation distance between the coil | windings wound around the tooth | gear part of the minimum.

In addition, when the number of slots of the stator arranged in a ring is N (N is an even number) and the number of magnetic poles generated by the stator winding is N-2, the winding wound around the adjacent teeth In the stator of an electric motor with the winding directions wound in opposite directions, the total cross-sectional shape of the winding wound around one tooth is concave, and the total cross-sectional shape of the winding wound around the other tooth is convex It can be a shape. As a result, the total cross-sectional shape of the winding wound around the adjacent tooth portions becomes a concavo-convex shape, and the windings can be wound in an aligned manner without interfering with each other, and can be brought close to each other while maintaining an insulation distance.

  Even if the wire diameter of the stator winding of such an electric motor uses a thick wire diameter of φ0.85 to φ2.5, there is no winding thickening of the winding and it is easy for the resin bobbin attached to the teeth of the stator Thus, it is possible to obtain a stator of an electric motor in which windings are wound small and the copper loss is reduced. In addition, it is possible to provide a stator for an electric motor that is improved in quality without damage and deformation of the insulating bobbin and the laminated core with little damage and damage to the winding.

  In particular, when used in a stator of an electric motor mounted on a vehicle driven at a low voltage, a winding having a large wire diameter can be wound in alignment around a slot of the stator so that as many windings as possible can be wound. Specifically, it is suitable for a stator of an electric motor whose voltage is 60 V or less and whose driving operation range is 15000 r / min or less.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a concentrated winding method in which resin bobbins A1 and B1 are mounted on teeth A and B of a stator 1 of an electric motor arranged in an annular shape, and a winding 3 is wound directly from above the resin bobbins A1 and B1. It is a tooth | gear part enlarged view of the stator 1 of an electric motor. The winding direction of the winding 3 in the adjacent tooth portions A and B is wound around the tooth portions A and B of the stator 1 in the opposite directions.

  Specifically, when the tooth portion A in FIG. 1 is viewed from the inner diameter of the stator 1 (when viewed from the direction of the arrow), the winding direction of the winding 3 is wound in the counterclockwise direction. When the part B is viewed from the inner diameter of the stator 1 (when viewed from the direction of the arrow), the winding direction of the winding 3 is wound clockwise. The tooth part A and the tooth part B are connected by the connecting wire 3b. From the first turn of the winding start line of the tooth part A, it is wound counterclockwise and wound up to the eleventh turn (see FIG. 2 (b)), and then crosses to the adjacent tooth part B by the connecting wire 3b. . In the tooth part B, it is wound clockwise from the first turn of the connecting wire 3b from the tooth part A to the 11th turn of the final line (see FIG. 3B). In the present embodiment, the tooth part A and the tooth part B are connected by a crossover wire 3b to form one set.

  FIG. 6 shows a method of winding the stator of the electric motor shown in FIG. A connection diagram is shown in FIG. In the embodiment of FIG. 6, the tooth portions A and the tooth portions B are alternately arranged, and the winding direction of the winding 3 is wound in the opposite direction between the adjacent tooth portions. In FIG. 1 to 12 show a stator of a motor in which a winding 3 is mounted and concentratedly wound around 12 poles and 10 poles connected in a 2Y manner.

  Insulation in the slot 4 of the stator 1 is formed by the resin bobbins A1 and B1 attached to the tooth portions A and B of the stator 1. The resin bobbins A1 and B1 have a shape similar to the shape of the slot 4 of the stator 1, and the thickness of the resin bobbin at the main part in the slot 4 is about t0.3 to t0.8. As the material of the resin bobbin, PPS, PBT, PET, liquid crystal polymer, or the like is used.

  FIG. 2 shows cross-sectional views of the resin bobbin A1 attached to the tooth portion A of the stator of the electric motor in the embodiment of FIG. FIG. 2A is an axial cross-sectional view of the resin bobbin A1 on the winding drawer side of the resin bobbin A1 attached to the tooth portion A. FIG. FIG. 2B is a cross-sectional view of the resin bobbin A1 attached to the tooth portion A. FIG. 2C is an axial cross-sectional view of the resin bobbin A1 on the non-winding drawer side of the resin bobbin A1 attached to the tooth portion A. FIG. 4 shows a partial perspective view of the resin bobbin A1 shown in FIG.

  As can be seen from FIGS. 2B and 4, the resin bobbin A <b> 1 has a slot inner tooth side surface A <b> 11 of the resin bobbin A <b> 1 following the tooth portion A of the stator 1 and a slot inner bottom A <b> 12 of the resin bobbin A <b> 1. At the intersecting position, a corner protrusion A20 is provided in which the resin bobbin A1 protrudes into the slot 4.

  When the first turn of the winding start wire 3a of the winding 3 from the side of the corner projection A20 protruding into the slot 4 is seen from the inner diameter of the stator 1 on the side surface A11 of the slot inner tooth portion of the resin bobbin A1 It is wound counterclockwise. As a result, the winding start position of the winding 3 is shifted by approximately ½ pitch of the wire diameter of the winding 3, and the winding start is shifted to the side of the opening side A13 in the slot. As a result, the windings 3 can be easily stacked and wound with no gaps.

  Thus, in the embodiment of FIG. 2B, the first stage winding 3 can be aligned and wound from the slot inner bottom A12 to the slot opening side surface A13 from the first turn to the fifth turn. In the winding operation, the second turn turns from the side surface A13 of the opening inside the slot to the bottom A12 in the slot, and turns in order from the sixth turn to the ninth turn, and then turns back to the third step from the bottom inside the slot A12 to the inside of the slot. The windings 3 can be stacked and aligned and wound with certainty without turning off the 10th turn and the 11th turn facing the opening side surface A13.

  Here, the second and third folds slightly protrude from the center line 60 of the slot 4 of the stator 1 (the line connecting the center of the opening in the slot and the center of the bottom of the slot) (having a convex shape). ) In the embodiment of FIG. 1, when turning back from the first stage to the second stage, the sixth turn of the second stage is located between the third turn and the fourth turn 3 of the first stage. Further, when the second and third stages are folded back, the 10th turn is positioned between the second and third turns 8 and 9.

  As a result, 11 turns of the final turn in the tooth portion A to be wound slightly protrudes from the slot center line 60 (having a convex shape), but the winding 3 can be aligned and wound with almost no gap. In addition, the 6th turn of the 2nd stage is located between the 3rd turn of the 1st stage and the 4th turn winding, or between the 8th turn and the 9th turn winding 3 of the 2nd stage. It is possible to easily determine the position of the 10th turn by controlling the winding machine.

  Next, as understood from the embodiment of FIG. 1, after the 11th turn of the last turn of the tooth portion A is finished, the winding 3 is routed to the adjacent tooth portion B by the crossover wire 3b.

  FIG. 3 shows cross-sectional views of the resin bobbin B1 attached to the tooth portion B of the stator of the electric motor in the embodiment of FIG. FIG. 3A is an axial cross-sectional view of the resin bobbin B1 on the winding drawer side of the resin bobbin B1 attached to the tooth portion B. FIG. FIG. 3B is a cross-sectional view of the resin bobbin B1 attached to the tooth portion B. FIG. 3C is an axial cross-sectional view of the resin bobbin B1 on the non-winding drawer side of the resin bobbin B1 attached to the tooth portion B. FIG. 5 is a partial perspective view of the resin bobbin B1 shown in FIG.

  As can be seen from FIGS. 3B and 5, the resin bobbin B <b> 1 has a slot inner tooth side surface B <b> 11 of the resin bobbin B <b> 1 that follows the tooth portion B of the stator 1 and an in-slot opening side surface B <b> 13 of the resin bobbin B <b> 1. Is provided with a corner protrusion B30 that protrudes the resin bobbin B1 into the slot 4.

  When viewed from the stator inner diameter, the first-stage winding 3 is wound around the slot inner tooth side surface B11 of the resin bobbin B1 in the clockwise direction. From the first turn to the fifth turn of the winding 3 in the tooth portion B, the winding is aligned from the slot inner bottom B12 to the slot inner opening side surface B13 of the stator 1, but the sixth turn which is the final turn of the first stage Since the eye cannot be tightly attached to the slot inner tooth side surface B11 of the resin bobbin B1 and cannot be wound, the resin bobbin B1 is inserted into the slot 4 at a position where the slot inner tooth side surface B11 of the resin bobbin B1 and the slot inner opening side surface B13 intersect. A corner protrusion B30 protruding inward is provided to wind the winding 3 in an aligned manner so that the winding 3 does not collapse.

  Thereby, the 6th turn which is the final turn of the first stage of the winding 3 is shifted from the slot inner tooth side surface B11 to the center line 60 side of the slot 4 by about ½ pitch of the wire diameter of the winding 3. become. As a result, the windings 3 can be easily stacked and wound with no gaps.

  The corner projection B30 also serves as a guide groove for the winding 3 when the winding 3 is folded back to the second stage. If the corner projection B30 is not temporarily provided, the winding 3 is connected to the side surface of the inner portion of the slot. The winding cannot be performed in close contact with B11, or the windings 3 cannot be wound in an aligned manner, resulting in a thicker winding.

  Thereafter, the winding work is performed in the second stage from the side face B13 of the opening inside the slot to the bottom part B12 in the slot in order from the 7th turn to the 10th turn in order, and then from the bottom part B12 in the third turn. The winding 3 of the 11th turn of the final wire 3C facing the in-slot opening side surface B13 can be stacked and reliably aligned without being displaced.

  Here, the second and third folds are prevented from substantially protruding from the center line 60 of the slot 4 of the stator 1 (the line connecting the center of the opening in the slot and the center of the bottom of the slot) (recessed). Shape). Therefore, in the embodiment of FIG. 1, when turning back from the first stage to the second stage, the second stage seventh turn is located between the first stage fourth turn and the fifth turn winding 3. Yes. Further, when the second and third stages are folded, the winding 3 of the 11th turn of the final line 3C is positioned between the 10th turn of the second stage and the bottom surface B12 in the slot.

Further, as can be seen from this, the winding 3 wound around the tooth portion A and the tooth portion B can be surely brought into close contact and accurately aligned and wound around the resin bobbin A1 of the tooth portion A. The total cross-sectional shape of the winding 3 from the first turn to the eleventh turn is a convex shape slightly protruding from the center line 60 of the slot 4 of the stator 1 (the line connecting the center of the opening in the slot and the center of the bottom of the slot). On the contrary, the total cross-sectional shape of the winding 3 wound around the resin bobbin B1 of the tooth part B from the first turn to the eleventh turn is the center line 60 of the slot 4 of the stator 1 (opening in the slot). It has a concave shape that does not protrude from the line connecting the center and the center of the bottom of the slot. As a result, the total cross-sectional shape of the adjacent windings 3 wound around the tooth portion A and the tooth portion B becomes an uneven shape, and while ensuring a minimum insulation distance, the adjacent windings 3 do not interfere with each other. Winding 3 can be wound.

  A guide groove 50 for winding the winding 3 is provided on the slot inner tooth side surface A11 of the resin bobbin A1 and the slot inner tooth side surface B11 of the resin bobbin B1. The guide groove 50 is a corrugated concave / convex groove so that the wire diameter of the winding 3 is surely contained in the concave groove so that the aligned winding of the winding 3 does not shift when the winding 3 is aligned. With this guide groove 50, even with a large wire diameter winding, the windings 3 can be aligned and wound on the side surfaces A11 and B11 of the slot inner teeth of the resin bobbins A1 and B1 relatively easily. A better effect can be obtained by the synergistic effect.

  Moreover, when using embodiment shown in FIGS. 1-4, if it is the structure of the stator 1 which arrange | positioned the tooth | gear part cyclically | annularly, the adjacent tooth part A and tooth part B will be divided | segmented stator core. It is preferable to use a piece. This makes it possible to wind the winding 3 without considering a gap through which a nozzle of a winding machine or the like passes when winding the winding 3 around the tooth part A and the tooth part B. The winding 3 can be wound, and the performance of the electric motor can be improved. Therefore, as described above, the winding 3 can be wound only by considering the gap between the windings of the tooth portion A and the tooth portion B only with a minimum insulation distance.

  In the embodiment shown in FIGS. 1 to 4, the stator core pieces divided in the radial direction for each tooth portion as the center of the inner diameter of the stator 1 are annularly arranged and connected in the circumferential direction of the stator 1. . As for the coupling method, the coupling portion may be welded with a laser or the like, but it may be held and fixed by press-fitting into a case or the like by shrinking just by attaching the teeth of the stator core pieces in an annular shape. In this case, since welding with a laser or the like is not performed, there is no penetration of welding between the laminations of the thin steel plates forming the stator core pieces, and there is no short circuit between the thin steel plates, thereby increasing iron loss. Note that the method of dividing the stator 1 in which the tooth portions are arranged in an annular shape is not limited to this method. For example, the stator core piece may be divided into two parts, that is, a stator tooth portion and a yoke portion. .

  When the number of slots of the stator 1 arranged in a ring is N (N is an even number), and the number of magnetic poles generated by the winding 3 of the stator 1 is N-2, the adjacent tooth portion A , The winding direction of the winding 3 wound around B becomes a stator of the motor wound around in the opposite direction, so that the winding 3 of the winding 3 is different depending on the winding direction of the winding 3 wound around the tooth portion A and the tooth portion B. The total cross-sectional shape can be changed. For example, when the total cross-sectional shape of the wound winding 3 is a convex shape in the tooth portion A, the total cross-sectional shape of the wound winding 3 can be a concave shape in the tooth portion B. The total cross-sectional shape of the winding 3 wound around B is a shape in which the uneven shape faces each other with a slight gap. Thereby, many windings 3 can be wound around a tooth part only considering the insulation distance between the coil | winding of the tooth part A and the tooth part B, and the performance of an electric motor can be improved.

  In particular, in consideration of the balance of magnetic balance applied to the shaft of the motor, when the number of slots of the stator is 12, the number of magnetic poles generated by the stator winding is 10 poles (as the number of magnetic poles of the rotor). Is N ± 2 and becomes 10 poles or 14 poles), or when the number of slots of the stator is 18 slots, the number of magnetic poles generated by the stator winding is 16 poles (the number of rotor magnetic poles is N ± 2 and 16 or 20 poles).

  Further, the corner projections A20 and B30 of the resin bobbins A1 and B1 of the stator of the motor of the embodiment shown in FIGS. 1 to 4 have a wire diameter of the winding 3 wound around the tooth portions A and B of φ0. In the case of less than 85, when winding the winding 3 around the tooth portions A and B, the winding 3 becomes familiar with the tooth portions A and B, and the winding 3 is relatively easy even without taking into account aligned winding or thickening of the winding. Can be wrapped around. On the other hand, when the wire diameter of the winding 3 wound around the tooth portions A and B is φ2.6 or more, even if the corner projections A20 and B30 are provided on the resin bobbins A1 and B1, the wire of the winding 3 Since the diameter is too thick, the degree of freedom for winding is small, and the effect of providing the corner projections A20 and B30 cannot be sufficiently obtained. Therefore, the effect of the corner projections A20 and B30 of the resin bobbins A1 and B1 is maximized when the wire diameter of the winding 3 wound around the tooth portions A and B is mainly φ0.85 to φ2.5. It can be demonstrated.

  In addition, by using such a stator of an electric motor as a stator for a vehicle-mounted electric motor driven at a low voltage, windings with a large wire diameter are wound in alignment in the slots of the stator, and as many windings as possible. Can be wound. Furthermore, since the winding can be wound small, the copper loss can be reduced and the motor performance can be improved. In particular, the performance can be improved by using a stator for a motor for driving a vehicle or a stator for a motor for an electric power steering. In addition, it is possible to provide a stator for an electric motor having improved quality with little damage and deformation to the bobbin for insulation and the laminated core with little damage and damage to the windings. Specifically, it is suitable for a stator of an electric motor whose voltage is 60 V or less and whose driving operation range is 15000 r / min or less.

The tooth part enlarged view of the stator of the electric motor by embodiment. Sectional drawing of resin bobbin A1 with which it attached to the tooth | gear part A of the stator of the electric motor by embodiment of FIG. Sectional drawing of resin bobbin B1 with which the tooth | gear part B of the stator of the electric motor by embodiment of FIG. 1 was mounted | worn. The fragmentary perspective view in resin bobbin A1 with which the tooth | gear part A of embodiment of FIG. 2 was mounted | worn. The fragmentary perspective view in resin bobbin B1 with which the tooth | gear part B of embodiment of FIG. 3 was mounted | worn. The winding method wound around each tooth | gear part in embodiment of FIG. The connection diagram of the stator of the electric motor by the winding method of FIG.

  DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Yoke, 3 ... Winding, 3a ... Winding start wire, 3b ... Crossover wire, 3c ... Final wire, 4 ... Slot, A, B: Tooth part, A1, B1 ... Resin bobbin, A11, B11 ... Slot inner tooth side surface, A12, B12 ... Slot inner bottom side surface, A13, B13 ... Slot inner side surface , A20, B30... Corner projection, 50... Guide groove, 60.

Claims (5)

The teeth of the stator of the motor are arranged in an annular shape, and a resin bobbin is attached to the teeth and the winding is concentratedly wound. The winding direction of the winding is wound in the opposite direction at the adjacent teeth. A motor stator,
On the inner surface of the slot of the resin bobbin, corner projections are provided for winding and aligning the winding so that the winding is shifted by approximately 1/2 pitch of the wire diameter of the winding ,
The corner protrusion is provided at a position where the side surface of the slot inner tooth and the side surface of the bottom of the slot of one of the resin bobbins attached to the tooth portions adjacent to each other intersect, A stator for an electric motor, wherein the stator is provided at a position where a side surface of the tooth portion and a side surface of the opening portion in the slot on the slot opening side intersect. The stator of the electric motor according to claim 1, wherein the stator of the electric motor is a stator core divided and arranged in an annular shape. The number of slots for winding a winding around the stator of the motor has N (N is an even number) slots, and the number of magnetic poles generated by the winding of the stator is N-2. The stator of the electric motor according to claim 1 or claim 2 . The wrapped wire diameter in the teeth of the stator of the electric motor, the stator of the electric motor according to claim 1 wherein及至claim 3, wherein, characterized in that the Fai0.85～Fai2.5. The stator for an electric motor according to any one of claims 1 to 4 , wherein the stator is used for an electric motor for vehicle mounting.

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