Rotary electric machine

Abstract

To provide a rotary electric machine in which movement of a coil in the radially inward direction of a stator core can be restricted, and restrictions on the winding method of the coil can be reduced.SOLUTION: In a rotary electric machine, a stator teeth part 22 comprises a groove 14 for locking a fixing member 20 to a side face 22a facing the circumferential direction. The fixing member 20 is arranged so that one face has an open shape, and the open face faces a stator yoke part 21 of a stator core 4. In addition, the fixing member 20 includes a locking part (convex part) 20a to be locked to the groove 14 at the tip of the open face side.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[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. [Background technology]

[0002] Patent Document 1 describes a stator for a rotating electric machine that includes a stator core in which multiple teeth are arranged to form a ring, and multiple coils installed in slots between the multiple teeth. Engagement recesses are formed on the side of the teeth facing the slots, and the coils have insertion portions that are inserted into the slots covered with an insulating sheet, and the insulating sheet has engagement portions that engage with the engagement recesses (see abstract for the above). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-239583 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration of Patent Document 1, the engagement portion of the insulating sheet engages with the engagement recess (groove) provided on the side of the tooth, 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. [Means for solving the problem]

[0006] The rotating electric machine of the present invention comprises: a rotor disposed 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 a circumferential dimension larger than the circumferential dimension of the stator windings inserted into the stator slots; the stator teeth have grooves on their circumferential side surfaces that are located at the innermost portions of the stator slots, and the grooves engage with the fixing members; the fixing member has a shape with one surface open, and is arranged so that the open surface faces the stator yoke portion of the stator core, Furthermore, the fixing member has a locking portion at the tip end on the side of the open surface that is locked into the groove. [Effects of the Invention]

[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 inside in the radial direction of the stator core. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view taken along the axial direction of a rotating electric machine according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view perpendicular to the axial direction of a stator and a rotor according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a partially enlarged view of the stator of FIG. 2. [Figure 4] FIG. 2 is a perspective view of a fixing member according to the first embodiment of the present invention. [Figure 5]FIG. 4 is a view of a stator according to a second embodiment of the present invention, and is a partially enlarged view similar to FIG. 3. [Figure 6] FIG. 4 is a view of a stator according to a third embodiment of the present invention, and is a partially enlarged view similar to FIG. 3. [Figure 7] FIG. 10 is a view of a stator according to a fourth embodiment of the present invention, and is a partially enlarged view similar to FIG. [Figure 8] FIG. 10 is a view of a stator according to a fifth embodiment of the present invention, and is a partially enlarged view similar to FIG. 3. [Figure 9] FIG. 10 is a perspective view of a fixing member according to a sixth embodiment of the present invention. [Figure 10] FIG. 13 is a perspective view of a fixing member according to a seventh embodiment of the present invention. [Figure 11] FIG. 13 is a block diagram of an electric vehicle equipped with a rotating electric machine according to an eighth embodiment of the present invention. DETAILED DESCRIPTION OF THE 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] [Example 1] A first embodiment of the present invention will be described with reference to FIGS.

[0015] FIG. 1 is a cross-sectional view taken along the axial direction of a rotating electrical 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 polyphase 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] 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.

[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 are formed between the stator teeth 22 to house the stator windings 5. The stator windings 5 ​​housed in the stator slots 12 are fixed to the stator teeth 22 (stator slots 12) by fixing members 20 to prevent them from falling into the gaps 18 between the stator 2 and the rotor 3.

[0021] The rotor 3 includes a rotor core 7 made of multiple laminated electromagnetic steel sheets, 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 in Fig. 3, the housing 11 and the rotor 3 are not shown. Grooves (locking grooves) 14 for fixing the fixing member 20 are provided on the circumferential side surfaces 22a of the stator teeth 22. The fixing member 20 has its locking portions 20a inserted (locked) into the grooves 14, thereby holding the stator winding 5 in the stator slots 12. The fixing member 20 has an open shape toward the stator yoke 21 of the stator slots 12. Furthermore, the fixing member 20 has a protrusion 20a at its tip that is inserted into the groove 14. That is, the protrusion 20a forms a locking portion. The stator winding 5 is held in the stator slots 12 by inserting the protrusion 20a into the groove 14. In this case, the grooves 14 are positioned close to the stator yoke 21, which reduces magnetic saturation of the stator teeth 22 and improves torque. As a result, this embodiment contributes to the miniaturization of the rotating electric machine 1.

[0023] That is, the stator tooth portion 22 has a groove portion 14 for engaging the fixing member 20 in a portion of the circumferential side surface 22a 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] FIG. 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, a type of super engineering plastic with excellent heat resistance and flame retardancy, and 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 configured 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, reducing restrictions on the winding method of the stator winding 5.

[0027] Protrusions 20a are provided on each of the two tooth opposing surface portions 20b. Protrusions 20a are provided on the end of tooth opposing surface portions 20b on the opposite side to connecting portion 20c in radial direction D1. That is, protrusions 20a are provided on the end of tooth opposing surface portions 20b 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 convex portions 20a provided on one fixing member 20 are provided such that the interval therebetween expands from the radially inner side toward the outer side, and are inclined with respect to the tooth facing surface 20b and the radial direction D1. Therefore, the convex portions 20a project in the circumferential direction with respect to the tooth facing surface 20b.

[0030] As shown in FIG. 3, the groove portion 14 is formed by an inclined surface such that the interval W22a between the two side surfaces 22a of the two stator tooth portions 22 forming one stator slot portion 12 expands to an interval W22a' on the outermost peripheral side so as to correspond to the inclination of the convex portion 20a. Due to such shapes of the groove portion 14 and the convex portion (locking portion) 20a, the groove portion 14 is formed in a shape substantially parallel to the convex portion (locking portion) 20a.

[0031] Due to the presence of the groove portion 14, the interval W22a of the two side surfaces 22a changes to W22a' on the side of the stator yoke portion 21 (W22a < W22a'). This means that the circumferential dimension (depth) D14 of the groove portion 14 increases from the radially inner side toward the outer side, and the depth D14 of the groove portion 14 becomes deeper from the radially inner side toward the outer side.

[0032] The stator tooth portion 22 decreases in dimension (width) W22 in the circumferential direction from the radially outer side toward the inner side. Since the groove portion 14 is formed by an inclined surface and is inclined in a direction to expand the width W22 of the stator tooth portion 22 from the radially outer side toward the inner side, the magnetic saturation of the stator tooth portion 22 can be greatly alleviated.

[0033] [Embodiment 2] A second embodiment of the present invention will be described based on FIG. 5. FIG. 5 is a view of the stator 2 according to the second embodiment of the present invention, and is a partially enlarged view similar to FIG. 3. Hereinafter, the description will focus on the differences from the first embodiment. For configurations not described below, configurations similar to those of the first embodiment can be adopted as long as they do not conflict with 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. This allows the stator winding 5 to be held by the fixing member 20, while mitigating magnetic saturation caused by the magnetic flux passing through the stator tooth 22 at the radial positions where the groove 14 is located on the stator tooth 22, thereby improving torque.

[0035] Furthermore, in this embodiment, the radial dimension (width) W14 of the groove portion 14 is smaller than half the circumferential dimension (width) W12 of the stator slot portion 12. The circumferential dimension W12 of the stator slot portion 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 portion 14, and to prevent a decrease in the width W22 of the stator tooth portion 22 at a position radially inwardly away from the stator yoke portion 21.

[0036] [Example 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 members 20. Furthermore, the protrusions (locking portions) 20a of the fixing members 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] [Example 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 be similar to those of 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 with 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 sandwiched 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] [Example 5] A fifth embodiment of the present invention will be described with reference to Fig. 8. Fig. 8 is a diagram 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 be similar to those of 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. FIG. 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 to have 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 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 fixed members 20o, 20i include an inner-periphery-side fixed member 20i arranged on the inner periphery side in the radial direction and an outer-periphery-side fixed member 20o arranged on the outer periphery side. In addition to the first groove portion formed by the groove portion 14A, the stator teeth portion 22 includes a second groove portion 14B in the radially middle portion of the circumferentially facing side surface 22a, which engages the inner-periphery-side fixed member 20i. The outer-periphery-side fixed member 20o has a first locking portion 20a that engages with the first groove portion 14A. The inner-periphery-side fixed member 20i has a second locking portion 20a that engages with the second groove portion 14B. Furthermore, the rotor core 21 is arranged at a radial position of the second groove portion 14B and has a sandwiching member 30 sandwiched between the inner-periphery-side fixed member 20i and the outer-periphery-side fixed member 20o.

[0046] In this case as well, it is preferable that the circumferential dimension (width) of the stator teeth 22 at the radial position of the second groove portion 14B is greater 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] [Example 6] 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-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-20D, the fixed member 20 can be easily manufactured and costs can be reduced.

[0050] [Example 7] 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, the fixing member 20 is divided into a plurality of pieces in the axial direction D2, and fixing members 20A and 20D (see FIG. 9) arranged at both axial ends of the fixing member 20 are provided with flanges 20e that cover the end faces of the stator core 4. That is, the fixing member 20 of this embodiment has a configuration in which flanges 20e are provided on the fixing members 20A and 20D of the sixth embodiment. The flanges 20e are provided on each of the 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 each of the above-described embodiments, a permanent magnet synchronous motor has been described as the rotating electric machine 1, but the same effect can be obtained with an induction motor, a wound field synchronous motor, or a synchronous reluctance synchronous motor.

[0054] [Example 8] An embodiment (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 configuration diagram of an 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. As 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 object.

[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) 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); a stator winding (5) inserted into the stator slots (12) and wound around the stator teeth (22); and a fixing member (20) for fixing the stator winding (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 winding (5) inserted into the stator slots (12), The stator teeth 22 are provided with grooves 14 for engaging the fixing members 20 in the portions of the circumferentially facing side surfaces 22a located at the innermost portions of 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 that is locked into the groove portion 14 at the tip portion on the side of the open surface 20d.

[0059] (2) The groove portion 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 sandwiched 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 disposed on the inner circumferential side in the radial direction and an outer fixing member 20o disposed on the outer circumferential side, In addition to the first groove portion formed by the groove portion 14A, the stator teeth portion 22 includes a second groove portion 14B in a radially intermediate portion of a side surface 22a facing the circumferential direction, the second groove portion 14B engaging the inner peripheral side fixing member 20i, The outer circumferential fixing member 20o has a first locking portion 20a that is locked in the first groove portion 14A, The inner peripheral side fixing member 20i has a second locking portion 20a that is locked in the second groove portion 14B, The stator core 4 has a sandwiching member 30 that is disposed at a radial position of the second groove portion 14B and sandwiched between the inner circumferential side fixed member 20i and the outer circumferential side fixed member 20o.

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

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

[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 facing 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 rotor disposed 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 a circumferential dimension larger than the circumferential dimension of the stator windings inserted into the stator slots; the stator teeth have grooves on their circumferential side surfaces that are located at the innermost portions of the stator slots, and the grooves engage with the fixing members; the fixing member has a shape with one surface open, and is arranged so that the open surface faces the stator yoke portion of the stator core, The rotating electric machine further comprises a locking portion at a tip end of the fixing member on the side of the open surface, the locking portion being locked into the groove.

2. In claim 1, The rotating electric machine is characterized in that the groove portion has a shape that is approximately parallel to the locking portion.

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

4. In claim 1, a stator core having a sandwiching member sandwiched between the locking portion of the fixing member and the stator yoke portion, the sandwiching member being made of a material that expands when heated;

5. In claim 1, A rotating electric machine characterized in that the stator core has a sandwiched member sandwiched between the circumferential side of the stator tooth portion and the tooth opposing surface portion of the fixed member that faces the side of the stator tooth portion, and is made of a material that expands when heated.

6. In claim 3, the fixing member includes an inner fixing member disposed on the inner circumferential side in the radial direction and an outer fixing member disposed on the outer circumferential side, the stator teeth include, in addition to the first groove portion formed by the groove portion, a second groove portion that engages the inner peripheral side fixing member at a radially intermediate portion of the side surface facing the circumferential direction, the outer circumferential fixing member has a first locking portion that is locked in the first groove portion, the inner peripheral side fixing member has a second locking portion that is locked in the second groove portion, The rotating electric machine is characterized in that the stator core is arranged at a radial position of the second groove portion and has a sandwiching member sandwiched between the inner side fixing member and the outer side fixing member.

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

8. In claim 7, A rotating electric machine, characterized in that the fixing members disposed 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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