Stator of rotary electric machine and the rotary electric machine with them

Abstract

To improve temperature detection accuracy of a stator coil.SOLUTION: A stator coil 220 of the present invention, is formed in a U-character shape while having a bottom part 223 to which a first layer 221 and a second layer 222 are approached, and the first layer 221 and the second layer 222 are inserted into a different slot 212 in a peripheral direction of the stator core 211, respectively. In the slot 212, a plurality of stator coils 220 is arranged along a radial direction. In a bottom part 223 of a stator coil 220a in which the first layer 221 is positioned to the innermost periphery from the plurality of stator coils 220 arranged along a radial direction of the slot 212, a folding part 226 nipping and fixing a thermistor 270 for detecting a temperature of the stator coil 220a is connected. The second layer 222 comprises a first bent part 227 bent toward a peripheral direction.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a stator for a rotating electric machine, and a rotating electric machine including the stator. [Background technology]

[0002] In recent years, electric vehicles that run only on a rotating electric machine and hybrid electric vehicles that are driven by both an engine and a rotating electric machine have become widespread. The stator of the rotating electric machine is provided with a temperature detection element such as a thermistor to detect the temperature of the stator coil. For example, the technology described in Patent Document 1 has been proposed as a technology for providing a thermistor on a stator.

[0003] In Patent Document 1, a plurality of segment conductors are arranged in slots of a stator core, and the ends of the segment conductors are joined together to form a coil. The segment conductors have a rectangular cross section, a first surface and a second surface, and are arranged in the slots so that the first surface is parallel to the radial direction. A plurality of segment conductors are arranged in each slot so that the second surfaces of the segment conductors face each other. The plurality of segment conductors are joined at their respective ends so that the first surfaces face each other. In at least one of the plurality of pairs of joined two ends, a horizontal portion that is one of the ends has an extension portion formed by extending so as to protrude from a vertical portion that is the other end. A thermistor that detects the temperature of the coil is attached in contact with the extension portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-214011 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, the thermistor is placed in contact with the extension section. This requires time for the temperature of the heated stator coil to be transmitted to the extension section, resulting in poor sensitivity of the thermistor and reduced accuracy in detecting the temperature of the stator coil.

[0006] In addition, multiple stator coils are arranged radially in one slot, and the temperature of the stator coil located at the innermost position in the radial direction tends to be higher than the temperatures of stator coils located at other positions. However, the technology described in Patent Document 1 does not take into consideration the point of selecting the stator coil with the highest temperature among the stator coils arranged radially in a row and arranging the thermistor therein. For this reason, Patent Document 1 has an issue of reduced accuracy in detecting the temperature of the stator coil.

[0007] SUMMARY OF THE PRESENT INVETION It is an object of the present invention to provide a stator for a rotating electric machine that solves the above-mentioned problems and improves the accuracy of temperature detection of the stator coil, and a rotating electric machine including the stator. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a stator for a rotating electric machine, comprising a stator core formed extending in a radial direction and having a plurality of slots arranged in a circumferential direction, and a plurality of stator coils inserted into the plurality of slots, the stator coils being formed in a U-shape with a bottom where a first layer and a second layer approach each other, the first layer and the second layer being inserted into different slots in the circumferential direction of the stator core, the plurality of stator coils being arranged in the radial direction in the slots, the bottom of the stator coil in which the first layer is located at the innermost periphery among the plurality of stator coils arranged in the radial direction of the slots is connected to a folded portion that clamps and fixes a temperature detection element that detects the temperature of the stator coil, and the second layer is provided with a first bent portion bent toward the circumferential direction. Effect of the Invention

[0009] According to the present invention, it is possible to provide a stator for a rotating electric machine that improves the accuracy of temperature detection of a stator coil, and a rotating electric machine including the stator. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotating electric machine according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a circuit diagram of the power conversion device of FIG. [Diagram 3] 2 is a cross-sectional view of the rotating electric machine of FIG. 1 taken along the axial direction. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 2 is a perspective view of a stator according to an embodiment of the present invention. [Figure 6] FIG. 2 is a schematic cutaway view of a stator. [Figure 7] FIG. 2 is a partially enlarged view of a stator according to an embodiment of the present invention, as viewed from the radially inner side. [Figure 8] 1 is a perspective view of a stator coil including a thermistor according to an embodiment of the present invention, as viewed from the radially inner side; [Figure 9] 1 is a perspective view of a stator coil including a thermistor according to an embodiment of the present invention, as viewed from the radially outer side; [Figure 10] FIG. 10 is an enlarged view of a portion X in FIG. [Figure 11] 2 is a plan view of a stator coil 220 including a thermistor according to an embodiment of the present invention, as viewed from the radially inner side. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Like elements are given like reference numerals and similar descriptions will not be repeated.

[0012] The various components of the present invention do not necessarily have to be independent entities, and it is permitted that one component is made up of multiple members, that multiple components are made up of one member, that one component is part of another component, or that part of one component overlaps with part of another component.

[0013] The rotating electric machine according to the present invention can be applied to pure electric vehicles that run only on the rotating electric machine, and hybrid electric vehicles that are driven by both an engine and a rotating electric machine, but the following description will be given using a hybrid electric vehicle as an example.

[0014] FIG. 1 is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotating electric machine according to an embodiment of the present invention. An engine 120, a first rotating electric machine 200, a second rotating electric machine 300, and a battery 180 are mounted on a vehicle 100. When driving force from the rotating electric machines 200, 300 is required, the battery 180 supplies DC power to the rotating electric machines 200, 300 via a power conversion device 600, and receives DC power from the rotating electric machines 200, 300 during regenerative running. DC power is exchanged between the battery 180 and the rotating electric machines 200, 300 via the power conversion device 600. Although not shown, the vehicle is also equipped with a battery that supplies low-voltage power (for example, 14-volt power), and supplies DC power to a control circuit described below.

[0015] The rotational torque from the engine 120 and the rotating electric machines 200, 300 is transmitted to the front wheels 110 (wheels) via the transmission 130 and the differential gear 160. The front wheels 110 (wheels) are driven by the engine 120 and the rotating electric machines 200, 300. The transmission 130 is controlled by a transmission control device 134, and the engine 120 is controlled by an engine control device 124. The battery 180 is controlled by a battery control device 184. The transmission control device 134, the engine control device 124, the battery control device 184, the power conversion device 600, and the integrated control device 170 are connected by a communication line 174.

[0016] The integrated control device 170 is a higher-level control device than the transmission control device 134, the engine control device 124, the power conversion device 600, and the battery control device 184, and receives information indicating the respective states of the transmission control device 134, the engine control device 124, the power conversion device 600, and the battery control device 184 from them via a communication line 174. The integrated control device 170 calculates control commands for each control device based on the acquired information. The calculated control commands are transmitted to each control device via the communication line 174.

[0017] The high-voltage battery 180 is composed of a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery, and outputs high-voltage DC power of 250 to 600 volts or more. The battery control device 184 outputs the charge / discharge status of the battery 180 and the status of each unit cell battery that constitutes the battery 180 to the integrated control device 170 via the communication line 174.

[0018] When the integrated control device 170 determines that charging of the battery 180 is necessary based on information from the battery control device 184, it issues a command to the power conversion device 600 to perform power generation operation. The integrated control device 170 also mainly manages the output torque of the engine 120 and the rotating electric machines 200, 300, and performs calculation processing of the total torque and torque distribution ratio of the output torque of the engine 120 and the output torque of the rotating electric machines 200, 300, and transmits control commands based on the results of this calculation processing to the transmission control device 134, the engine control device 124, and the power conversion device 600. Based on the torque command from the integrated control device 170, the power conversion device 600 controls the rotating electric machines 200, 300 so that a torque output or generated power is generated as commanded.

[0019] The power conversion device 600 is provided with power semiconductors that constitute inverters for operating the rotating electric machines 200 and 300. The power conversion device 600 controls the switching operation of the power semiconductors based on commands from the integrated control device 170. The switching operation of the power semiconductors causes the rotating electric machines 200 and 300 to operate as electric motors or generators.

[0020] When the rotating electric machines 200, 300 are operated as electric motors, DC power from the high-voltage battery 180 is supplied to a DC terminal of an inverter of the power conversion device 600. The power conversion device 600 controls the switching operation of the power semiconductors to convert the supplied DC power into three-phase AC power and supplies it to the rotating electric machines 200, 300. On the other hand, when the rotating electric machines 200, 300 are operated as generators, the rotors of the rotating electric machines 200, 300 are rotated by a rotational torque applied from the outside, and three-phase AC power is generated in the stator coils of the rotating electric machines 200, 300. The generated three-phase AC power is converted into DC power by the power conversion device 600, and the DC power is supplied to the high-voltage battery 180, thereby charging the battery 180.

[0021] Fig. 2 is a circuit diagram of the power conversion device 600 in Fig. 1. The power conversion device 600 is provided with a first inverter device for the rotating electric machine 200 and a second inverter device for the rotating electric machine 300. The first inverter device includes a power module 610, a first drive circuit 652 that controls the switching operation of each power semiconductor 21 of the power module 610, and a current sensor 660 that detects the current of the rotating electric machine 200. The drive circuit 652 is provided on a drive circuit board 650.

[0022] On the other hand, the second inverter device includes a power module 620, a second drive circuit 656 that controls the switching operation of each power semiconductor 21 in the power module 620, and a current sensor 662 that detects the current of the rotating electric machine 300. The drive circuit 656 is provided on a drive circuit board 654. A control circuit 648 provided on a control circuit board 646, a capacitor module 630, and a transmission / reception circuit 644 mounted on a connector board 642 are used in common by the first inverter device and the second inverter device.

[0023] The power modules 610, 620 are operated by drive signals output from the corresponding drive circuits 652, 656. The power modules 610, 620 convert the DC power supplied from the battery 180 into three-phase AC power and supply the power to the stator coils, which are the armature windings of the corresponding rotating electric machines 200, 300. The power modules 610, 620 also convert the AC power induced in the stator coils of the rotating electric machines 200, 300 into DC power and supply it to the high-voltage battery 180.

[0024] The power modules 610 and 620 each include a three-phase bridge circuit as shown in Fig. 2, and series circuits corresponding to the three phases are electrically connected in parallel between the positive and negative sides of the battery 180. Each series circuit includes a power semiconductor 21 constituting an upper arm and a power semiconductor 21 constituting a lower arm, and these power semiconductors 21 are connected in series. The power modules 610 and 620 have substantially the same circuit configuration as shown in Fig. 2, and the power module 610 will be described here as a representative example.

[0025] In this embodiment, an IGBT (insulated gate bipolar transistor) 21 is used as a switching power semiconductor element. The IGBT 21 has three electrodes: a collector electrode, an emitter electrode, and a gate electrode. A diode 38 is electrically connected between the collector electrode and the emitter electrode of the IGBT 21. The diode 38 has two electrodes: a cathode electrode and an anode electrode, and the cathode electrode is electrically connected to the collector electrode of the IGBT 21 and the anode electrode is electrically connected to the emitter electrode of the IGBT 21 such that the direction from the emitter electrode to the collector electrode of the IGBT 21 is the forward direction.

[0026] Alternatively, a MOSFET (metal oxide semiconductor field effect transistor) may be used as the switching power semiconductor element. A MOSFET has three electrodes: a drain electrode, a source electrode, and a gate electrode. In the case of a MOSFET, a parasitic diode is provided between the source electrode and the drain electrode, with the forward direction being from the drain electrode to the source electrode, so there is no need to provide the diode 38 in FIG. 2.

[0027] The arm of each phase is configured by electrically connecting the emitter electrode of the IGBT 21 and the collector electrode of the IGBT 21 in series. In this embodiment, only one IGBT is shown in each upper and lower arms of each phase, but since the current capacity to be controlled is large, in reality, multiple IGBTs are electrically connected in parallel. In the following, for simplicity, the description will be given as one power semiconductor.

[0028] 2, each of the upper and lower arms of each phase is composed of three IGBTs. The collector electrodes of the IGBTs 21 of each upper arm of each phase are electrically connected to the positive electrode side of the battery 180, and the source electrodes of the IGBTs 21 of each lower arm of each phase are electrically connected to the negative electrode side of the battery 180. The midpoints of each arm of each phase (the connection parts between the emitter electrodes of the IGBTs on the upper arm side and the collector electrodes of the IGBTs on the lower arm side) are electrically connected to the armature coils (stator coils) of the corresponding phases of the corresponding rotating electric machines 200, 300.

[0029] The drive circuits 652, 656 constitute a drive unit for controlling the corresponding inverter device (power module 610, 620), and generate a drive signal for driving the IGBT 21 based on a control signal output from the control circuit 648. The drive signals generated by the drive circuits 652, 656 are output to the gates of the power semiconductor elements of the corresponding power modules 610, 620. The drive circuits 652, 656 each include six integrated circuits for generating drive signals to be supplied to the gates of the upper and lower arms of each phase, and the six integrated circuits are configured as one block.

[0030] The control circuit 648 constitutes a control section of each inverter device (power modules 610, 620), and is constituted by a microcomputer that calculates a control signal (control value) for operating (on / off) a plurality of switching power semiconductor elements. A torque command signal (torque command value) from a higher-level control device, the sensor output of the current sensors 660, 662, and the sensor output of the rotation sensor mounted on the rotating electric machines 200, 300 are input to the control circuit 648. The control circuit 648 calculates a control value based on these input signals, and outputs a control signal to the drive circuits 652, 656 for controlling the switching timing.

[0031] The transmitter / receiver circuit 644 mounted on the connector board 642 serves to electrically connect the power conversion device 600 to an external control device, and transmits and receives information to and from other devices via the communication line 174 in Fig. 1. The capacitor module 630 constitutes a smoothing circuit for suppressing fluctuations in DC voltage caused by the switching operation of the IGBT 21, and is electrically connected in parallel to the DC side terminals of the first power module 610 and the second power module 620.

[0032] FIG. 3 is a cross-sectional view of the rotating electric machine 200 of FIG. 1 cut along the axial direction. Note that FIG. 1 shows only one side of the rotating shaft center as a boundary. FIG. 4 is a cross-sectional view of FIG. 3 cut along line IV-IV. Note that FIG. 4 shows only the stator 210 and the rotor 250. Also, the stator coil 220 is omitted. Furthermore, the rotating electric machine 200 and the rotating electric machine 300 have almost the same structure, and the structure of the rotating electric machine 200 will be described below as a representative example. However, the structure shown below does not need to be adopted in both the rotating electric machines 200 and 300, and may be adopted in only one of them.

[0033] In the figure, the direction along the rotating shaft is defined as the "axial direction", the direction around the shaft is defined as the "circumferential direction", and the radial direction when the shaft is at the center is defined as the "radial direction".

[0034] A stator 210 is held inside housing 201, which is open on both axial sides. Stator 210 includes a stator core 211 formed by laminating a plurality of thin electromagnetic steel plates, a plurality of slots 212 formed in stator core 211, a plurality of teeth 213 formed between adjacent slots 212, and a plurality of stator coils 220 inserted into the plurality of slots 212 and wound around each of the plurality of teeth 213.

[0035] A rotor 250 is rotatably supported on the inner periphery of the stator core 211 via a gap G1.

[0036] The rotor 250 is formed by laminating a plurality of thin electromagnetic steel plates, and includes a rotor core 252 fixed to a rotating shaft 260, a plurality of magnet insertion holes 253 penetrating the rotor core 252 in the axial direction, a plurality of permanent magnets 254 inserted into the magnet insertion holes 253, and non-magnetic end plates 257, 258 arranged on both axial ends of the rotor core 252 to prevent the permanent magnets 254 from slipping out. The magnet insertion holes 253 are arranged at equal intervals along the circumferential direction of the rotor core 252. The permanent magnets 254 are rectangular parallelepiped-shaped, and are fixed in the magnet insertion holes 253 by pouring an adhesive into the magnet insertion holes 253 after being inserted into the magnet insertion holes 253. The circumferential width of the magnet insertion holes 253 is formed larger than the circumferential width of the permanent magnets 254, and magnetic gaps 255 are formed on both sides of the permanent magnets 254. The magnetic gap 255 may be filled with adhesive, or may be solidified integrally with the permanent magnet 254 using resin.

[0037] The magnetization direction of the permanent magnets 254 faces the radial direction, and the magnetization direction is reversed for each field pole. That is, if the surface of the permanent magnet 254 that forms a certain magnetic pole on the stator 210 side is an N pole and the surface on the rotating shaft 260 side is an S pole, the surface of the permanent magnet 254 that forms the adjacent magnetic pole on the stator 210 side is an S pole and the surface on the rotating shaft 260 side is an N pole. In this embodiment, eight permanent magnets 254 are magnetized and arranged at equal intervals in the circumferential direction so that the magnetization direction alternates for each magnetic pole, and the rotor 250 forms eight poles.

[0038] Openings on both axial sides of housing 201 are closed by a pair of end brackets 202, and both axial sides of stator 210 and rotor 250 are covered by these end brackets 202. The center of end bracket 202 is penetrated, and rotating shaft 260 protrudes from this penetrated portion.

[0039] End bracket 202 is provided with bearings 203 and 204 , respectively, and rotor 250 is rotatably supported on the inner periphery side of stator 210 by bearings 203 and 204 supporting rotating shaft 260 .

[0040] The rotating shaft 260 is provided with a resolver 261 that detects the pole position and rotation speed of the rotor 250. An output from the resolver 261 is input to a control circuit 648 shown in FIG. 2. The control circuit 648 outputs a control signal to a drive circuit 652 based on the input output. The drive circuit 652 outputs a drive signal based on the control signal to a power module 610. The power module 610 performs a switching operation based on the control signal, and converts the DC power supplied from the battery 180 into three-phase AC power. This three-phase AC power is supplied to the stator coil 220 shown in FIG. 3, and a rotating magnetic field is generated in the stator 210. The frequency of the three-phase AC current is controlled based on the output value of the resolver 261, and the phase of the three-phase AC current with respect to the rotor 250 is also controlled based on the output value of the resolver 261.

[0041] Further description will be given of the configuration of the stator 210. Fig. 5 is a perspective view of the stator 210 according to an embodiment of the present invention. Fig. 6 is a schematic view of the stator 210 with a part cut away.

[0042] The stator coil 220 is formed by bending a rectangular wire into a U-shape, and is inserted into the slots 212. More specifically, the stator coil 220 is formed into a U-shape with a bottom 223 where the first layer 221 and the second layer 222 approach each other, and the first layer 221 and the second layer 222 are inserted into different slots 212 in the circumferential direction of the stator core 211.

[0043] The first layer 221 of the stator coil 220 includes a first straight portion 221a inserted into the slot 212, a first inclined portion 221b protruding axially outward from the stator core 211 and arranged at an incline relative to the stator core 211, and an end portion 221c protruding axially outward from the stator core 211 opposite the first inclined portion.

[0044] The second layer 222 of the stator coil 220 includes a second straight portion 222a inserted into the slot 212, a second inclined portion 222b protruding axially outward from the stator core 211 and arranged at an incline relative to the stator core 211, and an end portion 222c protruding axially outward from the stator core 211 opposite the second inclined portion.

[0045] In this embodiment, a rectangular wire is used for the stator coil 220, and the stator coil 220 is wound by a distributed winding method. Distributed winding is a winding method in which the stator coil 220 is housed in spaced slots 212 across multiple slots 212. A rectangular wire with a rectangular cross section is formed into a U-shape in advance using foam molding or the like, and the stator coil 220 is inserted along the slot 212 in which insulating paper 256 is provided. Then, the first straight portion 221a and the second straight portion 222a of the stator coil 220 are inserted into two spaced slots 212 across multiple slots 212.

[0046] Thereafter, the end 222c protruding outward in the axial direction of the stator core 211 (toward the lower side of the paper) is twisted, and the end 222c is joined by welding or the like to an end 221c of another stator coil 220 that has been similarly twisted, to form a joint 235. In this manner, a single phase winding is formed by inserting a plurality of stator coils 220 into the slots 212 of the stator core 211 and connecting them.

[0047] In the stator coil 220, the surface is covered with a thin insulating resin layer for insulation treatment. However, the insulating resin layer is peeled off from the end 222c of the stator coil 220 in order to weld it to the end 221c of another stator coil 220. The portion from which the insulating resin layer is peeled off is powder coated for insulation treatment after the ends 221c, 222c of the stator coil 220 are welded together to form a joint 235. Furthermore, in the stator 210, the joint 235 is powder coated, and then the slots 212 of the stator core 211 are infiltrated with insulating resin.

[0048] Rotating electric machines used in electric vehicles such as hybrid electric automobiles require precise control, and in order to achieve this, it is necessary to detect the temperature of the stator coil with high accuracy. Means for solving this problem will be described below.

[0049] Fig. 7 is a partially enlarged view of a stator 210 according to an embodiment of the present invention, as viewed from the radially inner side. Fig. 8 is an external perspective view of a stator coil 220 including a thermistor 270 according to an embodiment of the present invention, as viewed from the radially inner side. Fig. 9 is an external perspective view of a stator coil 220 including a thermistor 270 according to an embodiment of the present invention, as viewed from the radially outer side. Fig. 10 is an enlarged view of a portion X in Fig. 9. In Fig. 10, a resin portion 280 is shown in a see-through state. Fig. 11 is a plan view of a stator coil 220 including a thermistor 270 according to an embodiment of the present invention, as viewed from the radially inner side.

[0050] In the slots 212, a plurality of stator coils 220 (straight portions of the stator coils 220) are arranged along the radial direction of the slots 212. Also, each of the plurality of stator coils 220 is arranged so as to straddle one slot 212 and another slot 212 different from the one slot 212.

[0051] In this embodiment, among the multiple stator coils 220 arranged in the slots 212, the first straight portion 221a and the first inclined portion 221b constituting the first layer 221 of the stator coil 220a are located on the innermost circumference of the stator core 211.

[0052] The stator coil 220a includes extensions 224, 225 extending in the axial direction from a bottom portion 223, and a folded portion 226 extending in the axial direction from the extension 224, folded back at a predetermined position, and connected to the extension 225. In the stator coil 220a, the extension 224 constitutes a part of the first layer 221, and the extension 225 constitutes a part of the second layer 222.

[0053] Folded portion 226 is folded back so that the faces of folded portion 226 face each other in the radial direction. A thermistor 270 (temperature detection element) that detects the temperature of stator coil 220a is disposed and fixed to folded portion 226. Thermistor 270 is disposed so as to extend in the circumferential direction of stator core 211.

[0054] The folded portion 226 is connected to the bottom portion 223 via the extension portions 224 and 225. In other words, among the multiple stator coils 220 arranged in the slot 212, the folded portion 226 that clamps and fixes thermistor 270 (temperature detection element) that detects the temperature of the stator coil 220a is connected to the bottom portion 223 of the stator coil 220a in which the first layer 221 is located on the innermost periphery.

[0055] In addition, a first bent portion 227 bent in the circumferential direction is formed between the folded-back portion 226 and the bottom portion 223 of the second layer 222. The first bent portion 227 provided in the second layer 222 is bent in the circumferential direction so as to move away from the first layer 221.

[0056] Furthermore, a second bent portion 228 bent in the radial direction is formed between the folded portion 226 and the bottom portion 223 of the second layer 222. The second bent portion 228 of the second layer 222 is bent in the radially outward direction so as to move away from the first layer 221.

[0057] The thermistor 270 is connected to the integrated controller 170 via a wiring 271 , and the temperature of the stator coil 220 a detected by the thermistor 270 is input to the integrated controller 170 .

[0058] The surface of stator coil 220 (stator coil 220a) is insulated, but the insulation is removed at folded-back portion 226 of stator coil 220a. In this embodiment, the thermistor 270 is in contact with and clamped to the portion of stator coil 220a where the insulation is removed, so that the thermistor 270 and stator coil 220a can measure the copper temperature directly without going through the coating, improving the heat tracking of thermistor 270 and improving the temperature detection accuracy of stator coil 220a.

[0059] The folded portion 226, the first bent portion 227, and the second bent portion 228 of the stator coil 220a from which the insulation treatment has been removed are covered with resin to form a resin portion 280. The resin portion 280 may be made of a super engineering plastic such as polyphenylene sulfide (PPS), polyamide-imide (PAI), or fluororesin.

[0060] The resin part 280 prevents the thermistor 270 from coming out of the folded part 226 and insulates the peeled part. Therefore, the molding of the resin part 280 is performed in a state where the thermistor 270 is sandwiched by the folded part 226 after the first bent part 227 and the second bent part 228 are formed in the second layer 222. The resin part 280 is molded, for example, by pouring resin into two dies having a division surface D as shown in FIG. 9, and removing the two dies after the resin has hardened. The resin part 280 includes a bulging part 280a that bulges in the circumferential direction so as to be away from the first layer 221 in a portion that covers the first bent part 227 in accordance with the shape of the first bent part 227. Furthermore, the resin part 280 is formed such that the radially outer position that covers the second bent part 228 is formed in accordance with the shape of the second bent part 228. In other words, since the radially outer outer surface and the radially inner outer surface of the resin part 280 are formed with a predetermined distance between them, the distance between the radially outer outer surface and the dividing surface D and the distance between the radially inner outer surface and the dividing surface D of the mold can be secured, thereby improving the manufacturability of the mold.

[0061] According to this embodiment, the folded portion 226 holding thermistor 270 is covered with resin portion 280, so that thermistor 270 can be firmly fixed to the folded portion 226. Also, the portion of stator coil 220a where the insulation treatment has been peeled off is covered with resin portion 280, so that insulation can be ensured.

[0062] The present invention is not limited to the above-mentioned embodiment, and various modifications are included. For example, the above-mentioned embodiment has been described in detail to easily explain the present invention, and is not necessarily limited to those including all of the configurations described. Also, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Also, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0063] 21...power semiconductor, 38...diode, 100...vehicle, 110...front wheel, 120...engine, 124...engine control device, 130...transmission, 134...transmission control device, 160...differential gear, 170...integrated control device, 174...communication line, 180...battery, 184...battery control device, 200...rotating electric machine, 201...housing, 202...end bracket, 203 ...bearing, 204...bearing, 210...stator, 211...stator core, 212...slot, 213...teeth, 220...stator coil, 220a...stator coil, 221...first layer, 221a...first straight portion, 221b...first inclined portion, 221c...end portion, 222...second layer, 222a...second straight portion, 222b...second inclined portion, 222c...end portion, 223...bottom portion, 224...extension portion, 225...extension portion, 226...folded portion, 227...first bent portion, 228...second bent portion, 235...joint portion, 250...rotor, 252...rotor core, 253...magnet insertion hole, 254...permanent magnet, 255...magnetic gap, 256...insulating paper, 257...end plate, 258...end plate, 260...rotating shaft, 261...resolver, 270...thermistor, 271...wiring, 280...resin portion, 280a...bulging portion , 300... rotating electric machine, 600... power conversion device, 610... first power module, 620... second power module, 630... capacitor module, 642... connector board, 644... transmitting / receiving circuit, 646... control circuit board, 648... control circuit, 650... drive circuit board, 652... drive circuit, 654... drive circuit board, 656... drive circuit, 660... current sensor, 662... current sensor

Claims

1. A stator for a rotating electric machine includes a stator core having a plurality of slots formed to extend along a radial direction and arranged in a circumferential direction, and a plurality of stator coils inserted into the plurality of slots, The stator coil is formed in a U-shape with a bottom where a first layer and a second layer approach each other, and the first layer and the second layer are inserted into different slots in a circumferential direction of the stator core, A plurality of stator coils are arranged in the slot along a radial direction, a folded portion that sandwiches and fixes a temperature detection element that detects a temperature of the stator coil is connected to the bottom of the stator coil in which the first layer is located at the innermost periphery among the plurality of stator coils arranged along the radial direction of the slot, A stator for a rotating electric machine, wherein the second layer is provided with a first bent portion bent in a circumferential direction.

2. 2. The stator of a rotating electric machine according to claim 1, A stator for a rotating electric machine, wherein the second layer is provided with a second bent portion bent in a radial direction.

3. 3. The stator of a rotating electric machine according to claim 2, A stator for a rotating electric machine, wherein the folded portion, the first bent portion, and the second bent portion are covered with a resin.

4. 4. The stator of a rotating electric machine according to claim 3, A stator for a rotating electric machine, wherein the resin covering the first bent portion is provided with a bulging portion that bulges in a circumferential direction.

5. A rotating electric machine including a stator and a rotor rotatably supported on an inner circumferential side of the stator via a gap, 5. A rotating electric machine, wherein the stator is as defined in claim 1.

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