Rotary electric machine

Abstract

The purpose of the present invention is to provide a rotary electric machine capable of reducing restriction generated in a coil-winding method while restricting movement of the coil directed to the radially inner side of a stator core.　In this rotary electric machine, a stator tooth part 22 is provided with a groove part 14 for locking a fixing member 20 on a side surface 22a that faces in the circumferential direction. The fixing member 20 is configured so as to be open on one surface, and the open surface is positioned facing a stator yoke part 21 of a stator core 4. Furthermore, the fixing member 20 has a locking part (protrusion) 20a that locks in the groove part 14 at the tip part on the open surface side.

Description

rotating electrical machines

[0001] The present invention relates to a rotating electric machine, and more particularly to a structure for holding down the coils of a stator core.

[0002] Patent Document 1 describes a stator for a rotating electrical machine that includes a stator core with multiple teeth arranged in an annular shape and multiple coils inserted into slots between the multiple teeth. The teeth have engagement recesses on the side surfaces facing the slots, and the coils have insertion portions that are inserted into the slots covered by an insulating sheet, which has engagement portions that engage with the engagement recesses (see abstract for the above).

[0003] JP 2011-239583 A

[0004] In the configuration of Patent Document 1, the engagement portions of the insulating sheet engage with engagement recesses (grooves) provided on the side surfaces of the teeth, thereby restricting the movement of the coil toward the radially inward direction of the stator core. However, because two coils inserted into the same slot and wound around adjacent teeth are covered by a single insulating sheet, the coils cannot be inserted into the slots from the inner diameter side of the stator, which creates a problem of restrictions on the coil winding method.

[0005] An object of the present invention is to provide a rotating electric machine that can reduce restrictions on the coil winding method while restricting the movement of the coil toward the inside in the radial direction of the stator core.

[0006] The rotating electric machine of the present invention comprises: a stator having a stator core; a rotor arranged opposite the stator with a gap therebetween; a plurality of stator teeth formed on the stator core; stator slots formed between adjacent stator teeth; a stator winding inserted into the stator slot and wound around the stator teeth; and a fixing member for fixing the stator winding to the stator teeth, wherein the stator slots have slot openings with a circumferential dimension larger than the circumferential dimension of the stator winding inserted into the stator slots; the stator teeth have a groove on their circumferential side located deep inside the stator slot for engaging with the fixing member; the fixing member has a shape that is open on one side and is arranged so that the open side faces the stator yoke portion of the stator core; and the fixing member has a locking portion at its tip on the open side that is locked with the groove.

[0007] According to the present invention, it is possible to reduce restrictions on the coil winding method while restricting the movement of the coil toward the radially inward direction of the stator core. Problems, configurations, and effects other than those described above will become clear from the description of the following embodiments.

[0008] FIG. 1 is a cross-sectional view along the axial direction of a rotating electric machine according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view perpendicular to the axial direction of a stator and a rotor according to the first embodiment of the present invention. FIG. 3 is a partially enlarged view of the stator of FIG. 2. FIG. 4 is a perspective view of a fixing member according to the first embodiment of the present invention. FIG. 5 is a view of a stator according to a second embodiment of the present invention, which is a partially enlarged view similar to FIG. 3. FIG. 6 is a view of a stator according to a third embodiment of the present invention, which is a partially enlarged view similar to FIG. 3. FIG. 7 is a view of a stator according to a fourth embodiment of the present invention, which is a partially enlarged view similar to FIG. 3. FIG. 8 is a view of a stator according to a fifth embodiment of the present invention, which is a partially enlarged view similar to FIG. 3. FIG. 9 is a perspective view of a fixing member according to a sixth embodiment of the present invention. FIG. 10 is a perspective view of a fixing member according to a seventh embodiment of the present invention. FIG. 11 is a block diagram of an electric vehicle equipped with a rotating electric machine according to an eighth embodiment of the present invention.

[0009] To prevent the stator windings of a rotating electric machine from falling out of the slots (stator slot portions) of the stator core, grooves (locking grooves) are provided on both circumferential sides of the stator slot portions, and locking portions of the fixing members are placed in these grooves to prevent the stator windings from falling out. The fixing members are made of a magnetic or non-magnetic material. Here, the two circumferential side surfaces of the stator slot portions are the same as the two circumferential side surfaces of the stator teeth facing the stator slot portions. Also, the circumferential side surfaces are the side surfaces facing in the circumferential direction.

[0010] On the other hand, by providing grooves on the side surfaces of the stator slots, the width of the stator teeth in the grooved areas becomes narrower, which makes it more difficult for the magnetic flux generated by the stator windings and the magnetic flux generated by the rotor field source to pass through, resulting in leakage flux and a decrease in torque relative to the current.

[0011] Furthermore, increasing the width of the stator teeth reduces the width of the stator slots, reducing the cross-sectional area of ​​the stator winding and increasing its resistance, which poses a problem of increased copper loss when current is passed through the stator winding.

[0012] To solve these problems, the grooves on the side surfaces of the stator slots are provided on the outer diameter side (outer periphery) of the stator, which alleviates magnetic saturation of the stator teeth 22 and increases torque.

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] [Embodiment 1] A first embodiment of the present invention will be described with reference to Figs.

[0015] FIG. 1 is a cross-sectional view along the axial direction of a rotating electric machine 1 according to a first embodiment of the present invention. The rotating electric machine 1 is illustrated as a permanent magnet synchronous motor, and will be described as such in the following embodiments. The stator 2 of the rotating electric machine 1 is composed of a stator core 4, a multi-phase stator winding (coil) 5 wound around the stator core 4, and a housing 11 that holds the stator core 4 on its inner circumferential surface. The rotor 3 is composed of a rotor core 7, end plates 15, a shaft 8, and bearings 10, and the bearings 10 rotatably support the rotor 3. The bearings 10 are supported by end brackets 9, which are fixed to the housing 11. The rotor core 7 is axially held down at both axial ends by the end plates 15.

[0016] The rotor core 7 of the rotor 3 is provided with a plurality of rotor slots 6 for inserting permanent magnets 13. The permanent magnets 13 are held in the axial direction by end plates 15 at both axial ends of the rotor 3. Here, the axial direction refers to the direction along the central axis of the shaft 8.

[0017] In order to reduce the weight of the rotor 3, an axial duct 17 is formed in the end plate 15 and the rotor core 7, penetrating in the axial direction.

[0018] Fig. 2 is a cross-sectional view perpendicular to the axial direction of the stator 2 and rotor 3 according to the first embodiment of the present invention. Note that the axial duct 17 is not shown in Fig. 2.

[0019] The rotating electric machine 1 is composed of a stator 2 and a rotor 3. The stator 2 is composed of a stator core 4 and a stator winding 5. The stator winding 5 is wound around the stator core 4, more specifically, around stator teeth 22.

[0020] The stator core 4 includes a cylindrical stator yoke 21 and a plurality of stator teeth 22 that protrude radially inward from the inner peripheral surface of the stator yoke 21 and extend axially along the inner peripheral surface of the stator yoke 21. The stator teeth 22 are arranged at equal intervals in the circumferential direction along the inner peripheral surface of the stator yoke 21. Stator slots 12 in which stator windings 5 ​​are housed are formed between the stator teeth 22. The stator windings 5 ​​housed in the stator slots 12 are fixed to the stator teeth 22 (stator slots 12) by fixing members 20 so as not to fall into the gaps 18 between the stator 2 and the rotor 3.

[0021] The rotor 3 includes a rotor core 7 formed by laminating multiple electromagnetic steel plates, and permanent magnets 13 inserted into multiple rotor slots 6 provided in the rotor core 7. The rotor core 7 has a structure in which the rotor slots 6, an axial duct 17 that penetrates in the axial direction, and a shaft insertion hole 8a are punched out. The rotor 3 is configured by inserting a shaft 8 into the shaft insertion hole 8a that penetrates the rotor core 7. The rotor 3 is driven to rotate in a clockwise or counterclockwise direction, and the rotating electric machine 1 is operated as an electric motor.

[0022] FIG. 3 is a partially enlarged view of the stator 2 in FIG. 2 . Note that the housing 11 and the rotor 3 are not shown in FIG. 3 . Grooves (locking grooves) 14 for fixing the fixing member 20 are provided on the circumferential side surfaces 22 a of the stator teeth 22 . The fixing member 20 holds the stator winding 5 in the stator slot 12 by inserting (locking) its locking portions 20 a into the grooves 14 . The fixing member 20 has a shape that opens toward the stator yoke 21 of the stator slot 12 . Furthermore, the fixing member 20 has a protrusion 20 a at its tip that is inserted into the groove 14 . That is, the protrusion 20 a forms a locking portion. The stator winding 5 is held in the stator slot 12 by inserting the protrusion 20 a into the groove 14 . In this case, the grooves 14 are positioned close to the stator yoke 21 , thereby mitigating magnetic saturation of the stator teeth 22 and improving torque. As a result, this embodiment can contribute to the miniaturization of the rotating electrical machine 1.

[0023] That is, the stator tooth portion 22 has a groove portion 14 for engaging the fixing member 20 on a side surface 22a facing the circumferential direction, in a portion located deep inside the stator slot portion 12. The fixing member 20 has a shape that is open on one surface 20d (see FIG. 4), and is arranged so that the open surface 20d faces the stator yoke portion 21 of the stator core 4. Furthermore, the fixing member 20 has an engaging portion (protrusion) 20a that engages with the groove portion 14 at the tip portion on the side of the open surface 20d.

[0024] The circumferential dimension (width) W12 of the stator slot portion 12 is larger than the circumferential dimension (width) W5 of the stator winding 5 to be inserted into the stator slot portion 12. In this embodiment, the circumferential dimension (width) of the slot opening of the stator slot portion 12 is the same as the circumferential dimension W12 of the stator slot portion 12. This allows the stator winding 5 to be inserted into the stator slot portion 12 from the inner diameter side of the stator 2.

[0025] 4 is a perspective view of a fixing member 20 according to a first embodiment of the present invention. The fixing member 20 is made of a liquid crystal polymer, which is a type of super engineering plastic with excellent heat resistance and flame retardancy. The fixing member 20 has a protrusion 20a, a teeth opposing surface portion 20b, and a connecting portion 20c. In this embodiment, the protrusion 20a, the teeth opposing surface portion 20b, and the connecting portion 20c are formed as a single member. Two teeth opposing surface portions 20b are provided on one fixing member 20, and the two teeth opposing surface portions 20b respectively face two side surfaces 22a of two stator teeth 22 that form one stator slot portion 12. The connecting portion 20c connects the two side surfaces 20b on the inner diameter side of the stator 2 (on the side of the gap 18 between the stator 2 and the rotor 3).

[0026] The fixing member 20 is closed on three sides by the two tooth opposing surface portions 20b and the connecting portion 20c, and has an open shape (open portion) 20d on the side opposite to the connecting portion 20c in the radial direction D1 of the stator core 4 (see FIG. 3). This allows the stator winding 5 to be inserted into the stator slot portion 12 from the inner diameter side of the stator 2, and reduces restrictions on the winding method of the stator winding 5.

[0027] Convex portions 20 a are provided on each of the two tooth opposing surface portions 20 b. Convex portions 20 a are provided on the end of tooth opposing surface portions 20 b on the opposite side to connecting portion 20 c in radial direction D1. That is, convex portions 20 a are provided on the end of tooth opposing surface portions 20 b on the stator yoke portion 21 side in radial direction D1.

[0028] In this embodiment, the two tooth opposing surface portions 20b are parallel to each other, and the distance W20b between the two tooth opposing surface portions 20b is constant in the radial direction D1. This corresponds to the fact that the two side surfaces 22a of the two stator teeth 22 that form one stator slot 12 are parallel to each other, and the distance W22a (see FIG. 3) between the two side surfaces 22a of the two stator teeth 22 is constant in the radial direction D1.

[0029] The two protrusions 20a provided on one fixing member 20 are provided such that the distance between them increases from the inside to the outside in the radial direction, and are inclined with respect to the teeth opposing surface 20b and the radial direction D1, so that the protrusions 20a protrude in the circumferential direction relative to the teeth opposing surface 20b.

[0030] 3, the groove 14 is formed with inclined surfaces so that the distance W22a between the two side surfaces 22a of the two stator teeth 22 that form one stator slot 12 widens to a distance W22a' on the outermost side in accordance with the inclination of the protrusion 20a. Due to the shapes of the groove 14 and the protrusion (locking portion) 20a, the groove 14 is formed in a shape that is approximately parallel to the protrusion (locking portion) 20a.

[0031] Due to the presence of groove 14, the distance W22a between the two side surfaces 22a changes to W22a' (W22a<W22a') on the stator yoke 21 side. This means that the circumferential dimension (depth) D14 of groove 14 increases from the inside to the outside in the radial direction, and the depth D14 of groove 14 increases from the inside to the outside in the radial direction.

[0032] The circumferential dimension (width) W22 of the stator teeth 22 decreases from the radial outside to the radial inside. The grooves 14 are formed with inclined surfaces and are inclined in a direction that increases the width W22 of the stator teeth 22 from the radial outside to the radial inside, which significantly reduces magnetic saturation of the stator teeth 22.

[0033] [Embodiment 2] A second embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a diagram of a stator 2 according to the second embodiment of the present invention, and is a partially enlarged view similar to Fig. 3. The following description will focus on differences from the first embodiment. Configurations not described below can adopt the same configuration as the first embodiment, as long as they do not contradict the first embodiment.

[0034] If the circumferential dimension (width) of the stator tooth 22 where the groove 14 is located is Wt2, the maximum depth of the groove 14 is Dk, and the circumferential dimension (width) of the stator tooth 22 on the inner diameter side of the stator is Wt1, then at the radial positions where the groove 14 is located on the stator tooth 22, there is a relationship of Wt2 > Wt1 between Wt2 and Wt1. In other words, the groove 14 is located at a radial position where Wt2 > Wt1. As a result, while the stator winding 5 is held by the fixing member 20, magnetic saturation caused by the magnetic flux passing through the stator tooth 22 is alleviated at the radial positions where the groove 14 of the stator tooth 22 is provided, thereby improving torque.

[0035] Furthermore, in this embodiment, the radial dimension (width) W14 of the groove 14 is smaller than half the circumferential dimension (width) W12 of the stator slot 12. The circumferential dimension W12 of the stator slot 12 is the same as the distance W22a between the two side surfaces 22a described above. This makes it possible to reduce the radial dimension W14 of the groove 14, and to prevent a decrease in the width W22 of the stator tooth 22 at a position radially inwardly away from the stator yoke 21.

[0036] [Embodiment 3] A third embodiment of the present invention will be described with reference to Fig. 6. Fig. 6 is a diagram of a stator 2 according to the third embodiment of the present invention, and is a partially enlarged view similar to Fig. 3. The following description will focus on differences from the first and second embodiments. Configurations not described below can adopt the same configurations as the first and second embodiments, as long as they are not inconsistent with the first and second embodiments.

[0037] Grooves 14 are provided on the side surfaces of the stator teeth 22, and the stator windings 5 ​​are fixed by the fixing member 20. Furthermore, the protrusions (locking portions) 20a of the fixing member 20 are arranged to be fixed to the stator yoke 21 side of the stator slots 12 using wedges 30. That is, the wedges 30 are provided on the side of the open portion 20d (see FIG. 4) of the fixing member 20, and are sandwiched between the two protrusions 20a of the fixing member 20 and the inner circumferential surface of the stator yoke 21. That is, the wedges 30 constitute sandwiching members sandwiched between the two protrusions 20a of the fixing member 20 and the stator yoke 21. The wedges 30 are made of a material that expands when heated.

[0038] After insertion, the wedge 30 is made of, for example, foam insulating paper that expands when heated, thereby reinforcing the fixation of the fixing member 20. In this embodiment as well, magnetic saturation caused by the magnetic flux passing through the stator teeth 22 is alleviated, improving torque and the holding strength of the stator winding 5.

[0039] [Embodiment 4] A fourth embodiment of the present invention will be described with reference to Fig. 7. Fig. 7 is a diagram of a stator 2 according to the fourth embodiment of the present invention, and is a partially enlarged view similar to Fig. 3. The following description will focus on differences from the first to third embodiments. Configurations not described below can adopt the same configurations as the first to third embodiments, as long as they are not inconsistent with the first to third embodiments.

[0040] Grooves 14 are provided on the side surfaces 22a of the stator teeth 22, and the stator windings 5 ​​are fixed by the fixing members 20. Furthermore, wedges 30 are arranged on the side surfaces 22a of the stator teeth 22 of the stator slots 12, and the fixing members 20 are fixed in the stator slots 12. That is, the wedges 30 are sandwiched between the side surfaces 22a of the stator teeth 22 and the teeth-facing surfaces 20b of the fixing members 20. That is, the wedges 30 constitute sandwiching members sandwiched between the side surfaces 22a of the stator teeth 22 and the teeth-facing surfaces 20b of the fixing members 20. The wedges 30 are made of a material that expands when heated.

[0041] After insertion, the wedge 30 is made of foam insulating paper that expands when heated, thereby reinforcing the fixation of the fixing member 20. In this embodiment as well, magnetic saturation caused by the magnetic flux passing through the stator teeth 22 is alleviated, improving torque and the holding strength of the stator winding 5.

[0042] [Embodiment 5] A fifth embodiment of the present invention will be described with reference to Fig. 8. Fig. 8 is a view of a stator 2 according to the fifth embodiment of the present invention, and is a partially enlarged view similar to Fig. 3. The following description will focus on differences from the first to fourth embodiments. Configurations not described below can adopt the same configurations as the first to fourth embodiments, as long as they are not inconsistent with the first to fourth embodiments.

[0043] A plurality of grooves 14 are provided on one side surface of the stator teeth 22, and the stator windings 5 ​​are fixed with a plurality of fixing members 20. In this case, the plurality of fixing members 20 are arranged side by side in the radial direction. Figure 8 shows an example in which two fixing members 20o, 20i are arranged side by side in the radial direction. The two fixing members 20o, 20i are configured in the same shape, and each fixing member 20 has a protrusion (locking portion) 20a that is locked into a plurality of grooves 14 provided on one side surface of the stator teeth 22.

[0044] Furthermore, in this embodiment, the protruding portions 20a of the fixing members 20i are fixed into the stator slot portions 12 by using wedges 30 near the middle of the stator windings 5 ​​housed in the stator slot portions 12. The wedges 30 are sandwiched between the two protruding portions 20a of the fixing member (inner peripheral side fixing member) 20i arranged on the inner diameter side (inner peripheral side) and the connecting portion 20c of the fixing member (outer peripheral side fixing member) 20 arranged on the outer diameter side (outer peripheral side).

[0045] That is, in the rotating electric machine 1 of this embodiment, the fixing members 20o, 20i include an inner fixing member 20i arranged on the inner periphery side in the radial direction and an outer fixing member 20o arranged on the outer periphery side. In addition to the first groove portion formed by the groove portion 14A, the stator teeth 22 include a second groove portion 14B in the radially middle portion of the circumferentially facing side surface 22a, which locks the inner fixing member 20i. The outer fixing member 20o has a first locking portion 20a that locks into the first groove portion 14A. The inner fixing member 20i has a second locking portion 20a that locks into the second groove portion 14B. Furthermore, the stator core 4 is arranged at a radial position of the second groove portion 14B and has a sandwiching member 30 that is sandwiched between the inner fixing member 20i and the outer fixing member 20o.

[0046] In this case, too, it is preferable that the circumferential dimension (width) of the stator tooth 22 at the radial position of the second groove portion 14B is larger than the circumferential dimension (width) Wt1 on the inner diameter side of the stator.

[0047] In this embodiment as well, magnetic saturation due to the magnetic flux passing through the stator teeth 22 is alleviated, improving torque, and the electromagnetic force acting on the fixing member 20 can be reduced, improving the holding strength of the stator winding 5.

[0048] Sixth Embodiment A sixth embodiment of the present invention will be described with reference to Fig. 9. Fig. 9 is a perspective view of a fixing member 20 according to the sixth embodiment of the present invention. The following description will focus on differences from the first to fifth embodiments. Configurations not described below can adopt the same configurations as the first to fifth embodiments, as long as they are not inconsistent with the first to fifth embodiments.

[0049] This embodiment differs from the previous configurations in that the fixed member 20 is divided into multiple pieces in the axial direction D2. Each divided fixed member 20A to 20D has the same configuration as the fixed member 20 described in the first embodiment. In this embodiment as well, magnetic saturation due to magnetic flux passing through the stator teeth 22 is alleviated, improving torque. Furthermore, by being able to reduce the axial dimension of each of the fixed members 20A to 20D, the fixed member 20 can be easily manufactured and costs can be reduced.

[0050] Seventh Embodiment A seventh embodiment of the present invention will be described with reference to Fig. 10. Fig. 10 is a perspective view of a fixing member 20 according to the seventh embodiment of the present invention. The following description will focus on differences from the first to sixth embodiments. Configurations not described below can adopt the same configurations as the first to sixth embodiments, as long as they are not inconsistent with the first to sixth embodiments.

[0051] In this embodiment, fixing member 20 is divided into multiple pieces in axial direction D2, and fixing members 20A and 20D (see FIG. 9) arranged at both axial ends of fixing member 20 are provided with flanges 20e that cover the end faces of stator core 4. In other words, fixing member 20 of this embodiment has a configuration in which flanges 20e are provided on fixing members 20A and 20D of the sixth embodiment. Flanges 20e are provided on each of two tooth opposing surface portions 20b that constitute one fixing member 20A.

[0052] In this embodiment as well, magnetic saturation caused by the magnetic flux passing through the stator teeth 22 is alleviated, improving torque. Furthermore, the fixing member 20 can increase the insulation distance between the stator winding 5 and the stator core 4, eliminating the need for insulation at the coil end portions and reducing costs.

[0053] In the above-described embodiments, a permanent magnet synchronous motor has been described as the rotating electric machine 1, but the same effects can be obtained with an induction motor, a wound field synchronous motor, or a synchronous reluctance synchronous motor.

[0054] [Eighth Embodiment] An eighth embodiment in which the present invention is applied to an electric vehicle 100 will be described with reference to Fig. 11. Fig. 11 is a block diagram of the electric vehicle 100 equipped with a rotating electric machine 1 according to the eighth embodiment of the present invention.

[0055] The body 200 of the electric vehicle 100 is supported by four wheels 110, 112, 114, and 116. Because the electric vehicle 100 is front-wheel drive, a rotating electric machine 1 is attached to the front axle 154. The driving torque of the rotating electric machine 1 is controlled by a control device 130. A battery 140 is provided as a power source for the control device 130, and electric power is supplied from the battery 140 to the rotating electric machine 1 via the control device 130, driving the rotating electric machine 1 and causing the wheels 110 and 114 to rotate.

[0056] In the above embodiment, the permanent magnet rotating electric machine has been described as being used to drive the wheels of an electric vehicle, but it can also be used to drive the wheels of an electric locomotive, etc. An electric vehicle, electric vehicle, electric locomotive, etc. are called a drive system, and this drive system uses the above-mentioned rotating electric machine 1 to drive a moving body.

[0057] According to this embodiment, by applying the rotating electric machine 1 to an electric vehicle or an electric automobile, a high-torque rotating electric machine drive device can be mounted, and a small and lightweight electric vehicle or an electric automobile can be provided.

[0058] Each of the above-described embodiments has the following features: (1) In a rotating electric machine 1 comprising a stator 2 having a stator core 4, a rotor 3 arranged opposite the stator 2 with a gap 18 therebetween, a plurality of stator teeth 22 formed on the stator core 4, stator slots 12 formed between adjacent stator teeth 22, stator windings 5 ​​inserted into the stator slots 12 and wound around the stator teeth 22, and a fixing member 20 for fixing the stator windings 5 ​​to the stator teeth 22, wherein the stator slots 12 have slot openings with a circumferential dimension larger than the circumferential dimension of the stator windings 5 ​​inserted into the stator slots 12, the stator teeth 22 have grooves 14 for engaging the fixing member 20 in portions of their circumferentially facing side surfaces 22a located deep within the stator slots 12, The fixing member 20 has a shape that is open on one surface 20d, and is arranged so that the open surface 20d faces the stator yoke portion 21 of the stator core 4. Furthermore, the fixing member 20 has a locking portion (protrusion) 20a at the tip on the side of the open surface 20d that is locked into the groove portion 14.

[0059] (2) The groove 14 is shaped to be substantially parallel to the locking portion 20a.

[0060] (3) The circumferential dimension (width) Wt2 of the stator teeth 22 at the radial position of the groove 14 is larger than the circumferential dimension (width) Wt1 of the stator teeth 22 on the inner diameter side of the stator.

[0061] (4) The stator core 4 has a sandwiching member 30 (FIG. 6) sandwiched between the locking portion 20a of the fixing member 20 and the stator yoke portion 21 and made of a material that expands when heated.

[0062] (5) The stator core 4 has a sandwiching member 30 (Figure 7) sandwiched between the circumferentially facing side 22a of the stator tooth portion 22 and the tooth opposing surface portion 20b of the fixing member 20 that faces the side 22a of the stator tooth portion 22, and is made of a material that expands when heated.

[0063] (6) The fixing member 20 includes an inner fixing member 20i arranged on the inner circumferential side in the radial direction and an outer fixing member 20o arranged on the outer circumferential side, the stator teeth portion 22 includes, in addition to the first groove portion formed by the groove portion 14A, a second groove portion 14B that engages the inner fixing member 20i in the radial middle portion of the side surface 22a facing the circumferential direction, the outer fixing member 20o has a first engaging portion 20a that engages with the first groove portion 14A, the inner fixing member 20i has a second engaging portion 20a that engages with the second groove portion 14B, and the stator core 4 is arranged at a radial position of the second groove portion 14B and has a clamping member 30 that is sandwiched between the inner fixing member 20i and the outer fixing member 20o.

[0064] (7) The fixing member 20 is divided into a plurality of parts (20A to 20D) in the axial direction.

[0065] (8) The fixing members 20A, 20D disposed at both axial ends of the stator core 4 have flanges 20e that cover the end faces of the stator core 4.

[0066] (9) A drive system using the rotating electric machine 1 according to any one of (1) to (8) for driving a moving body.

[0067] The present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0068] 2...stator, 3...rotor, 4...stator core, 5...stator winding, 12...stator slot portion, 14...groove portion, 14A...first groove portion, 14B...second groove portion, 18...gap, 20, 20A to 20D...fixing member, 20a...locking portion (convex portion), first locking portion and second locking portion, 20b...teeth-facing surface portion of fixing member 20 that faces side surface 22a of stator tooth portion 22, 20d...open surface of fixing member 20, 20e...flange portion, 20i...inner peripheral side fixing member, 20o...outer peripheral side fixing member, 21...stator yoke portion, 22...stator tooth portion, 22a...side surface of stator tooth portion 22 facing circumferential direction, 30...sandwiching member.

Claims

1. A rotating electric machine comprising: a stator having a stator core; a rotor arranged opposite the stator with a gap therebetween; a plurality of stator teeth formed on the stator core; stator slots formed between adjacent stator teeth; stator windings inserted into the stator slots and wound around the stator teeth; and fixing members for fixing the stator windings to the stator teeth, wherein the stator slots have slot openings with circumferential dimensions larger than the circumferential dimension of the stator windings inserted into the stator slots; wherein the stator teeth have grooves on their circumferential side faces located deep inside the stator slots for engaging the fixing member; the fixing member has a shape with one face open, and is arranged so that the open face faces the stator yoke of the stator core; and the fixing member has a locking portion at its tip on the open face side that is engaged with the groove.

2. A rotating electric machine according to claim 1, wherein the groove portion is shaped to be substantially parallel to the locking portion.

3. A rotating electric machine according to claim 1, characterized in that the circumferential dimension of the stator teeth at the radial position of the groove is greater than the circumferential dimension of the stator teeth on the inner diameter side of the stator.

4. A rotating electric machine according to claim 1, characterized in that the stator core has a sandwiched member sandwiched between the locking portion of the fixing member and the stator yoke portion, and made of a material that expands when heated.

5. A rotating electric machine according to claim 1, characterized in that the stator core has a sandwiched member sandwiched between the side surface facing the circumferential direction of the stator teeth portion and the teeth opposing surface portion of the fixed member opposing the side surface of the stator teeth portion, and made of a material that expands when heated.

6. A rotating electric machine according to claim 3, wherein the fixing members comprise an inner fixing member arranged on the inner periphery side in the radial direction and an outer fixing member arranged on the outer periphery side, the stator teeth portion comprises, in addition to the first groove portion constituted by the groove portion, a second groove portion for engaging the inner fixing member in a radially intermediate portion of the side surface facing the circumferential direction, the outer fixing member has a first engaging portion engaged with the first groove portion, the inner fixing member has a second engaging portion engaged with the second groove portion, and the stator core is arranged at a radial position of the second groove portion and comprises a sandwiching member sandwiched between the inner fixing member and the outer fixing member.

7. A rotating electric machine according to claim 1, wherein the fixing member is divided into a plurality of parts in the axial direction.

8. A rotating electric machine according to claim 7, wherein the fixing members arranged at both axial ends of the stator core have flanges that cover the end faces of the stator core.

9. A drive system using the rotating electric machine according to claim 1 for driving a moving body.

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