JP2020028166A - Stator, rotary electric machine, and automobile electric accessory system - Google Patents

Abstract

To sufficiently reduce coil resistance and torque ripple in a rotary electric machine.SOLUTION: A stator 10 includes: a stator core 100 on which a plurality of teeth 120 are provided; and a plurality of segment coils 140a to 140d inserted in a slot 130 formed between the teeth 120. Each of the teeth 120 has a portion 122 having a minimum teeth width in a region 121 opposite the innermost peripheral segment coil 140a positioned in the innermost circumference in the slot 130 among the plurality of segment coils 140a to 140d and on an outer peripheral side relative to an inner peripheral side end 141a of the innermost peripheral segment coil 140a. Opposite side surfaces 142a and 143a along a radial direction of the innermost peripheral segment coil 140a have portions 144a and 145a which are parallel to each other and portions 146a and 147a having a decreased interval on the inner peripheral side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stator, a rotating electric machine using the same, and an electric auxiliary machine system for an automobile.

  In recent years, with the shift from hydraulic systems to electric systems and the expansion of the market for hybrid vehicles and electric vehicles, the mounting rate of electric power steering (EPS) and electric brake devices has increased rapidly. ing. Also, with the spread of vehicles that partially automate driving operations such as idling stop and braking, driving comfort has been improved and noise in the vehicle interior has been reduced.

  As vibration sources originating from the electric motor, which lead to vibration and noise in the vehicle cabin, there are a torque fluctuation component (cogging torque and torque ripple) of the electric motor and an electromagnetic excitation force generated between the stator and the rotor of the electric motor. . Of these, the vibration energy due to the torque fluctuation component propagates into the vehicle interior via the output shaft of the electric motor, and the vibration energy due to the electromagnetic excitation force propagates into the vehicle interior via the mechanical parts of the EPS device. . Propagation of these vibration energies into the vehicle interior leads to vibration and noise in the vehicle interior.

  For example, in the EPS device, the electric motor assists the steering wheel operation, so that the driver feels the cogging torque and torque ripple of the electric motor through the steering wheel. In order to suppress this, in an electric motor used in the EPS device, it is generally required to suppress cogging torque to less than 1/1000 of the assist torque and torque ripple to less than 1/100 of the assist torque. Further, it is preferable that the minimum order of the spatial mode of the electromagnetic excitation force is not less than 2.

  Here, the output of the electric motor is proportional to (voltage acting on the magnetic circuit) × (current). Therefore, in an EPS device driven by a low-voltage power supply, it is required to reduce the resistance of the winding in order to reduce the loss. In order to reduce the resistance of the winding without changing the motor outer diameter due to size restrictions, at least one of the reduction of the winding length by reducing the motor shaft length and the increase of the winding diameter (winding cross-sectional area) is required. One is needed.

In the EPS device, when the steering wheel is suddenly operated, the rotation speed of the electric motor increases, and the induced voltage due to the magnet flux increases, so that the voltage acting on the magnetic circuit decreases. At this time, as a method for preventing the torque from becoming too small, field weakening control is generally used. That is, at the time of high rotation, the output of the electric motor is maintained while maintaining the voltage acting on the magnetic circuit by canceling the magnet magnetic flux by performing the field weakening control. In order to perform field-weakening control, but the winding is required to have a sufficient d-axis inductance to counteract the magnetic flux, the inductance is proportional to the axial length × number of turns ^2, the motor in order to reduce the winding length When the shaft length is reduced, a sufficient d-axis inductance cannot be obtained. Therefore, to reduce the resistance of the winding in the EPS device, it is necessary to increase the winding diameter (winding cross-sectional area).

  In an electric motor in which distributed windings are formed using electric wires having a substantially rectangular cross section, the winding cross-sectional area is substantially equal to the circumferential width of the winding times the radial width. When the winding cross-sectional area is increased by increasing the circumferential width, it is necessary to reduce the teeth width by the increased circumferential width of the winding. That is, when the winding cross-sectional area is increased, the tooth width is reduced accordingly. When the teeth width is reduced, magnetic saturation tends to occur, so that the torque ripple tends to increase. Therefore, in the electric motor used for the EP device, it is important to suppress an increase in torque ripple while reducing the resistance of the winding.

  With respect to reduction of winding resistance and torque ripple in an electric motor, a technique disclosed in Patent Document 1 is known. Patent Document 1 discloses that an armature core having an annular portion and a plurality of teeth extending radially from the annular portion, and a plurality of segment conductors provided in a slot between the teeth so as to penetrate in the axial direction. Wherein the teeth have a width adjustment portion that narrows the width of the slot in a direction perpendicular to the radial direction toward the radially inner side. A featured stator is disclosed.

JP 2013-5683 A

  The stator disclosed in Patent Literature 1 has much room for improvement with respect to reduction of winding resistance and torque ripple.

A stator according to the present invention includes a stator core provided with a plurality of teeth, and a plurality of segment coils inserted into slots formed between the teeth, wherein the teeth include the plurality of teeth. In a region of the segment coil opposed to the innermost peripheral segment coil arranged in the innermost periphery in the slot, and on the outer peripheral side from the inner peripheral end of the innermost peripheral segment coil, the teeth width is The radially inner side surface of the innermost segment coil has a portion that is minimum and a portion that is parallel to each other and a portion that is narrower on the inner peripheral side.
A rotating electric machine according to the present invention uses the above-described stator.
An electric auxiliary machine system for a vehicle according to the present invention includes the above rotating electric machine, and performs electric power steering or electric braking using the rotating electric machine.

  According to the present invention, winding resistance and torque ripple can be sufficiently reduced.

1 is a cross-sectional view of a permanent magnet type rotating electric machine according to an embodiment of the present invention, in a plane of rotation. An enlarged view of a cross section of a stator according to an embodiment of the present invention. Enlarged view of a cross section of a stator according to Comparative Example 1. Enlarged view of a cross section of a stator according to Comparative Example 2. The figure explaining the torque ripple reduction effect which concerns on one Embodiment of this invention. 1 is an external perspective view of a stator according to an embodiment of the present invention.

  Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each of the drawings, the same components are denoted by the same reference numerals and description thereof will be omitted.

  A configuration of a permanent magnet type rotating electric machine 1 including a rotor according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view in the rotation plane of a permanent magnet type rotating electric machine 1 according to one embodiment. FIG. 2 is an enlarged view of a cross section of the stator 10 according to one embodiment, and is an enlarged view of an X portion surrounded by a dotted line in FIG.

  As shown in FIG. 1, the permanent magnet type rotating electric machine 1 of the present embodiment has a 10-pole 60 in which a substantially annular stator 10 is disposed on the outer peripheral side and a substantially cylindrical rotor 20 is disposed on the inner peripheral side. It is a slot distribution winding permanent magnet type rotating electric machine. An air gap 30 is provided between the stator 10 and the rotor 20. The stator 10 has a stator core 100 and a core back 110, a plurality of teeth 120, slots 130 and windings 140, and is arranged to face the rotor 20 via the air gap 30. .

  The stator 10 is formed, for example, as follows. First, a plurality of radial teeth 120 are formed on the inner peripheral side by a stator core laminated body in which integral punched cores of electromagnetic steel sheets are laminated, and slots 130 are formed between the teeth 120. Next, a plurality of segment coils are inserted into each of the slots 130 to form the windings 140, which are then shrink-fitted or press-fitted into a housing (not shown) to be integrated. Thus, the stator 10 is formed.

  In addition, as shown in FIG. 1, the rotor 20 has a rotor core 200 that is an iron core formed by laminating electromagnetic steel sheets, and a shaft 300 that is a rotation axis. On the outer periphery of the rotor core 200, ten magnetic pole portions 220 are provided in the circumferential direction. Each of the magnetic pole portions 220 is provided with a magnetic pole outer peripheral surface forming a surface facing the stator 10, and is provided with a V-shaped storage space 212 in which the permanent magnet 210 is stored. In the storage space 212, two rectangular permanent magnets 210 are inserted and arranged for each magnetic pole part 220.

  As shown in FIGS. 1 and 2, in the stator 10 of the present embodiment, a winding 140 is formed by inserting four segment coils into each slot 130. In FIG. 2, reference numerals 140a, 140b, 140c, and 140d are assigned in order from the segment coil on the inner peripheral side. As shown in FIG. 2, in the stator 10 of the present embodiment, the teeth 120 face a segment coil (hereinafter, referred to as an “innermost segment coil”) 140 a arranged on the innermost side in the slot 130. In the region 121 (the region indicated by the solid arrow in the drawing) and on the outer peripheral side of the inner peripheral end portion 141a of the innermost peripheral segment coil 140a, the region 122 (the figure shows the minimum tooth width). (A range enclosed by a broken line) is provided. Also, corresponding to the shape of the teeth 120, the innermost segment coil 140a has a shape different from the other segment coils 140b to 140d. That is, while the segment coils 140b to 140d have a rectangular cross section, the innermost peripheral segment coil 140a has two side surfaces 142a and 143a extending in the radial direction and portions 144a and 145a (in FIG. It is formed so as to have a shape having portions indicated by broken-line arrows) and portions 146a and 147a whose intervals are narrowed on the inner peripheral side (portions indicated by dashed-dotted arrows in the drawing). As described above, both side surfaces 142a and 143a of the innermost circumferential segment coil 140a have shapes along the side surfaces of the teeth 120 facing each other.

  When forming the winding 140 by inserting the segment coils 140a to 140d into the respective slots 130, the segment coils 140a and 140b are inserted first. Then, these segment coils 140a and 140b are pressed toward the inner peripheral side, that is, toward the distal end side of each tooth 120. As a result, the inner peripheral portions 146a and 147a of the both side surfaces 142a and 143a of the innermost peripheral segment coil 140a are brought into close contact with the side surfaces of the teeth 120 via insulating paper (not shown). Therefore, a gap necessary for inserting the remaining segment coils 140c and 140d into the respective slots 130 can be provided. Thereafter, the remaining segment coils 140c and 140d are inserted into the respective slots 130 to form the windings 140. At this time, the circumferential gap between the innermost segment coil 140a and the teeth 120 is smaller than the circumferential gap between the segment coil 140d and the teeth 120 arranged at the outermost periphery in the slot 130.

  In the stator 10 of the present embodiment, by inserting the segment coils 140a to 140d into the slots 130 to form the windings 140 as described above, the gap between the teeth 120 and the windings 140 is minimized. The ratio of the winding 140 occupied in the inside, that is, the ratio of the segment coils 140a to 140d can be increased. As a result, the cross-sectional area of the winding 140 can be increased, and the resistance can be reduced.

  Here, the effect of reducing the winding resistance and the torque ripple in the stator 10 of the present embodiment will be described in comparison with Comparative Examples 1 and 2. Comparative Example 1 is an example in which all of the sectional shapes of the segment coils 140a to 140d are the same substantially rectangular. Comparative Example 2 is an example in which the cross-sectional shape of the two inner segment coil segments 140a and 140b is trapezoidal. In both the present embodiment and Comparative Examples 1 and 2, the sectional areas of all the segment coils 140a to 140d are assumed to be equal.

  FIG. 3 is an enlarged view of a cross section of the stator 10A according to Comparative Example 1, and shows a portion corresponding to the enlarged view of the cross section of the stator 10 according to the embodiment shown in FIG. As shown in FIG. 3, in Comparative Example 1, the cross-sections of the segment coils 140 a to 140 d are substantially the same and substantially rectangular, and the circumferential width of each slot 130 accommodating the same is determined at any position along the radial direction. But they are the same. Therefore, the width of the teeth 120 changes in the radial direction, and decreases from the outer peripheral side toward the inner peripheral side. That is, the tooth width in Comparative Example 1 is minimum at a position in contact with the inner peripheral end 141a of the innermost peripheral segment coil 140a.

  FIG. 4 is an enlarged view of the cross section of the stator 10B according to Comparative Example 2, and shows a portion corresponding to the enlarged view of the cross section of the stator 10 according to the embodiment shown in FIG. As shown in FIG. 4, in Comparative Example 2, the cross-sectional shapes of the two inner segment coils 140a and 140b are trapezoidal, and the cross-sectional shapes of the two outer segment coils 140c and 140d are substantially rectangular. The circumferential width of each of the slots 130 for accommodating them is narrower toward the inner circumferential side along the radial direction at the position corresponding to the segment coils 140a and 140b, and at the position corresponding to the segment coils 140c and 140d, It is constant along the radial direction. Therefore, the width of the teeth 120 increases from the outer circumference to the inner circumference in the range along the segment coils 140a and 140b, and decreases from the outer circumference to the inner circumference in the range along the segment coils 140c and 140d. I do. That is, the tooth width in Comparative Example 2 is minimum at a position in contact with the boundary between the segment coil 140b and the segment coil 140c.

  FIG. 5 is a diagram illustrating the effect of reducing torque ripple according to one embodiment of the present invention. In FIG. 5, the magnetic field analysis is performed on the torque and torque ripple in the permanent magnet type rotating electric machine 1 using the stator 10 according to the present embodiment, the stator 10A according to Comparative Example 1, and the stator 10B according to Comparative Example 2, respectively. Are shown as ratios where the magnitude of torque and torque ripple in Comparative Example 1 are set to 1.

  As shown in FIG. 5, in the present embodiment, the torque ripple can be reduced by about 10% with almost no change in torque as compared with Comparative Example 1. On the other hand, in the comparative example 2, the torque ripple can be further reduced, but the torque is reduced by about 20% compared to the present embodiment and the comparative example 1. As described above, according to the present embodiment, since the torque ripple can be reduced without lowering the torque as compared with Comparative Examples 1 and 2, it is suitable for reducing both the winding resistance and the torque ripple.

  In the present embodiment, the reason why the torque ripple is reduced as compared with Comparative Example 1 is that the width of the teeth 120 is increased. That is, in the case of the present embodiment, as described with reference to FIG. 2, in the region 121 facing the innermost peripheral segment coil 140a and on the outer peripheral side of the inner peripheral end 141a of the innermost peripheral segment coil 140a. , The teeth width is minimized. Therefore, assuming that the sectional areas of the segment coils 140a to 140d are the same, the minimum teeth width of the present embodiment is larger than that of the comparative example 1. When the position of the minimum tooth width in Comparative Example 1, that is, the radius from the rotation center of the inner peripheral end portion 141a is A, and the position of the minimum tooth width in this embodiment, that is, the radius from the rotation center of the portion 122 is B. The increase in the minimum tooth width of the present embodiment with respect to Comparative Example 1 is represented by (BA) * 2π / N. Here, N represents the number of slots.

  In the present embodiment, the number of slots is N = 60 as described above. Therefore, the increment of the minimum teeth width calculated above is about 10% of (BA). As described above, in the present embodiment, the minimum teeth width can be increased as compared with Comparative Example 1, so that torque ripple can be reduced.

  Further, in the present embodiment, the radial length of the innermost segment coil 140a is increased as compared with the first comparative example, and the increase in the length is (BA) * π / N * (B -A) / W. Here, W represents the slot width. When this increase in the length is converted into a decrease in the radius of the rotor 20, this is a value of less than 1%. Therefore, it is considered that the amount of decrease in torque with respect to Comparative Example 1 in the present embodiment is offset by the amount of increase in torque due to the increase in the minimum tooth width, and becomes negligible.

  On the other hand, in Comparative Example 2, since the width of the teeth 120 is larger than in the present embodiment, the torque ripple is further reduced as described above. However, in Comparative Example 2, the radial length of the innermost circumferential segment coil 140a is significantly increased as compared with Comparative Example 1. Therefore, the radius of the rotor 20 is greatly reduced, which leads to a decrease in torque as described above.

  Further, in the case of Comparative Example 2, since the cross-sections of the segment coils 140a and 140b are trapezoidal shapes that are elongated in the radial direction, there is also a problem that the film integrity is likely to be impaired during processing. Furthermore, at the time of twisting of the distal end portion performed after insertion into the slot 130, it is necessary to apply a greater force to the inner peripheral side, so that the same processing steps cannot be employed for the segment coils 140c and 140d having a rectangular cross section. There are also problems. These problems occur particularly in the innermost segment coil 140a. Therefore, adopting a trapezoidal winding whose cross section is elongated in the radial direction like the segment coils 140a and 140b in the comparative example 2 is not preferable in terms of reduction of the winding resistance. FIG. 4 shows an example in which the position in contact with the boundary between the segment coil 140b and the segment coil 140c is the minimum tooth width as Comparative Example 2, but the position in contact with the boundary between the segment coil 140a and the segment coil 140b, A similar problem occurs when the position in contact with the boundary between 140c and segment coil 140d is the minimum tooth width.

  On the other hand, in the case of the present embodiment, the cross sections of the segment coils 140b to 140d excluding the innermost segment coil 140a can be substantially rectangular as in Comparative Example 1, and the innermost segment coil 140a can also be formed. , The cross-sectional shape of which can be made nearly rectangular. Therefore, the same processing as in Comparative Example 1 can be performed on the segment coils 140a to 140d.

  As described above, according to the permanent magnet type rotating electric machine 1 employing the configuration of the stator 10 according to the present embodiment, it can be seen that the winding resistance and the torque ripple can be sufficiently reduced.

  Further, in the present embodiment, an increase in the radial length of the cross section of the innermost segment coil 140a can be suppressed as compared with Comparative Example 2. In the present embodiment, since the number of slots is N = 60, the increase in the radial length can be kept to less than 10% as compared with the case of Comparative Example 1 in which the cross section of the innermost segment coil 140a is rectangular. it can. Note that even when the number of slots is different, the increase can be limited to about 20% at the maximum. For this reason, the problem of the film soundness at the time of processing as described above and the problem of the twistability of the end portion hardly occur, and the same processing as Comparative Example 1 can be performed. Furthermore, in the welding process of the segment coils performed after the end portion is twisted, the same workability as that of the segment coil having a rectangular cross section can be ensured. it can.

  Furthermore, in the present embodiment, of the innermost segment coil 140a, only the cross section of the portion disposed in the slot 130 is formed into a shape as shown in FIG. Like the other segment coils 140b to 140d, the cross-sectional shape may be substantially rectangular. With this configuration, the cross section of the end portion where the twisting is performed can be made substantially rectangular, so that the same processing as that of Comparative Example 1 can be performed.

  Since the resistance of the winding 140 is reduced in the present embodiment so that a large current can be used with a low-voltage power supply, it is not necessary to consider the eddy current loss in the segment coils 140a to 140d. . Therefore, there is no need to provide any gap other than that required for manufacturing between the segment coils 140 a to 140 d and the teeth 120 in the slot 120. Rather, it is not preferable to provide a useless gap in the slot 120, because this may hinder the lowering of the resistance of the winding 140. Therefore, in the present embodiment, as described above, the inner circumferential portions 146a and 147a of the both side surfaces 142a and 143a of the innermost circumferential segment coil 140a are brought into close contact with the side surfaces of the teeth 120, respectively, so that extra The gap is reduced, and the winding resistance is reduced as much as possible.

  Next, a three-dimensional winding structure of the stator 10 of the present embodiment will be described with reference to FIG. FIG. 6 is an external perspective view of the stator 10 according to one embodiment of the present invention.

  The stator 10 of the present embodiment has an annular stator core 100 and a wave-shaped winding 140 configured using the segment coils 140a to 140d described with reference to FIG. As shown in FIG. 6, the winding 140 includes a first system winding 141 and a second system winding 142. The first system winding 141 and the second system winding 142 electrically connect the terminal ends of a plurality of segment coils having a substantially U-shape corresponding to the segment coils 140a to 140d to each other at a connection portion 160. It is constituted by. As a connection method of the connection portion 160, solder, Tig welding, laser welding, or the like is used.

  As described with reference to FIG. 2, four conductors are provided as segment coils 140 a to 140 d in each slot 130 formed in the stator core 100. The first system winding 141 includes two conductors arranged on the inner peripheral side of the stator core 100, that is, segment coils 140a and 140b. The second system winding 142 is composed of the remaining two conductors arranged on the outer peripheral side of the first system winding 141, that is, the segment coils 140c and 140d. An insulating member 170 is provided between these two system windings 141 and 142 in order to avoid mutual mechanical and electrical contact. In addition, a crossover 161 is connected to each of the first system winding 141 and the second system winding 142 as necessary.

  The first system winding 141 and the second system winding 142 are respectively provided with a first system lead wire 151 and a second system winding lead wire 153 connected to an inverter (not shown). In the present embodiment, in order to avoid mechanical contact between the first system winding 141 and the second system winding 142, the first system lead wire 151 is on the right side of FIG. Each of them is collectively arranged on the left side of FIG. The first system lead wire 151 and the second system winding 142 have a winding start side and a winding end side for each of the three phase windings, and both of them have the same side in the stator core 100 in the axial direction. Are located in When the permanent magnet type rotating electric machine 1 is configured using the stator 10 of the present embodiment, three phases on the winding end side of the first system lead wire 151 and the second system winding 142 by a relay (not shown). Are preferably electrically connected to each other to provide a neutral point. Thus, when an electric short circuit occurs inside the permanent magnet type rotating electric machine 1, it is possible to prevent the occurrence of brake torque due to the electric short circuit by disconnecting the relay at the neutral point.

  As described above, according to the configuration of the present embodiment, the stator 10 capable of sufficiently reducing the winding resistance and the torque ripple and the permanent magnet type rotating electric machine 1 using the same can be realized.

  In addition, by using the permanent magnet type rotating electric machine 1 of the present embodiment in the EPS device, the power supply power can be effectively used by reducing the winding resistance, and the vibration and noise propagating into the vehicle interior can be suppressed. Further, by applying the present invention to other electric auxiliary equipment for automobiles, for example, an electric auxiliary equipment for automobile that performs electric braking, it is possible to reduce vibration and suppress noise and vibration. Further, the application of the permanent magnet type rotating electric machine 1 of the present embodiment is not limited to the field of automobiles, but can be applied to all industrial permanent magnet type rotating electric machines in which low resistance and low vibration are preferable.

  According to the embodiment of the present invention described above, the following operational effects can be obtained.

(1) The stator 10 has a stator core 100 provided with a plurality of teeth 120, and a plurality of segment coils 140a to 140d inserted into slots 130 formed between the teeth 120. The teeth 120 are located in a region 121 of the plurality of segment coils 140a to 140d opposed to the innermost peripheral segment coil 140a arranged in the innermost periphery in the slot 130, and on the inner peripheral side of the innermost peripheral segment coil 140a. A portion 122 having a minimum tooth width is provided on the outer peripheral side of the end portion 141a. Both side surfaces 142a and 143a along the radial direction of the innermost segment coil 140a have portions 144a and 145a parallel to each other and portions 146a and 147a whose intervals are reduced on the inner circumferential side. With this configuration, the winding resistance and the torque ripple can be sufficiently reduced.

(2) The side surfaces 142a and 143a of the innermost segment coil 140a have shapes along the side surfaces of the teeth 120 facing each other. The portions 146a, 147a of which the intervals are reduced on the inner peripheral side of both side surfaces 142a, 143a along the radial direction of the innermost peripheral segment coil 140a are in close contact with the side surfaces of the teeth 120 via insulating paper. With this configuration, the ratio of the winding 140 in the slot 130 can be made as large as possible, and the winding resistance can be sufficiently reduced.

(3) The circumferential gap between the innermost peripheral segment coil 140a and the tooth 120 is equal to the distance between the outermost peripheral segment coil 140d and the tooth 120 that are arranged at the outermost periphery in the slot 130 among the plurality of segment coils 140a to 140d. Smaller than the gap in the direction. Because of this, the segment coils 140a and 140b arranged on the inner peripheral side are inserted into each slot 130, and then the remaining segment coils 140c and 140d are inserted into each slot 130 to form the winding 140. it can.

(4) In the stator 10, the sectional areas of the plurality of segment coils 140a to 140d are equal to each other. With this configuration, the winding resistance of each phase can be made uniform.

(5) The permanent magnet type rotating electric machine 1 is configured using the stator 10 described above. With this configuration, it is possible to realize a rotating electric machine with sufficiently reduced winding resistance and torque ripple.

(6) The permanent magnet type rotating electric machine 1 as described above may be provided, and using the permanent magnet type rotating electric machine 1, an electric auxiliary machine system for an automobile that performs electric power steering or electric braking may be configured. In this way, it is possible to realize an automobile electric accessory system in which power and electric power are effectively used and vibration and noise are suppressed.

  In the present embodiment, the permanent magnet type rotating electric machine 1 having 10 poles and 60 slots distributed winding has been described as an example. However, the present invention is applicable to a rotating electric machine having a distributed winding having other poles and slots. That is, for a rotating electric machine having an arbitrary number of poles and slots, the winding resistance and the torque ripple can be sufficiently reduced according to the configuration of the stator described in the present embodiment.

  The above-described embodiments and various modifications are merely examples, and the present invention is not limited to these contents as long as the features of the present invention are not impaired. Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments that can be considered within the scope of the technical concept of the present invention are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Permanent magnet rotary electric machine 10 Stator 20 Rotor 30 Air gap 100 Stator core 110 Core back 120 Teeth 130 Slot 140 Winding 140a, 140b, 140c, 140d Segment coil 200 Rotor core 210 Permanent magnet 212 Storage space 220 Magnetic pole Part 300 shaft

Claims (6)

A stator having a stator core provided with a plurality of teeth, and a plurality of segment coils inserted into slots formed between the teeth,
The teeth are located in a region of the plurality of segment coils that opposes an innermost segment coil that is arranged at the innermost periphery in the slot, and that the teeth are larger than an inner peripheral end of the innermost segment coil. On the outer peripheral side, there is a part where the teeth width is the minimum,
A stator having a radially opposite side surface of the innermost segment coil having a portion parallel to each other and a portion having a narrower interval on the inner circumferential side. The stator according to claim 1,
The side surface of the innermost segment coil has a shape along the side surface of the opposite tooth,
A stator in which portions of the inner circumferential side of the inner circumferential segment coil, both sides of which are narrower on the inner circumferential side, are in close contact with the side surfaces of the teeth via insulating paper. The stator according to claim 2,
The circumferential gap between the innermost segment coil and the teeth is smaller than the circumferential gap between the outermost segment coil of the plurality of segment coils and the outermost segment coil arranged at the outermost periphery in the slot. Child. In the stator according to any one of claims 1 to 3,
A stator in which the plurality of segment coils have equal cross-sectional areas.   A rotating electric machine using the stator according to any one of claims 1 to 4. A rotating electric machine according to claim 5,
An electric auxiliary machine system for an automobile that performs electric power steering or electric braking using the rotating electric machine.

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