JPWO2019087747A1 - Rotor of rotary electric machine and rotary electric machine using it - Google Patents

Abstract

An object of the present invention is to provide a rotor of a rotating electric machine capable of increasing torque while suppressing an induced voltage when no load is applied. A rotor of a rotating electric machine having a configuration in which a permanent magnet is inserted into a magnet insertion hole provided in a rotor core. The permanent magnet has a first end face and a second end face facing in the magnetization direction. The first magnetic gap formed by the recesses on the inner wall surface of the magnet insertion hole in the region facing the first end face of the permanent magnet and the magnet insertion hole in the region facing the second end face of the permanent magnet. It is characterized in that a second magnetic void formed by a recess on the inner wall surface is formed. Further, the width (w1) and depth (d1) of the first magnetic void, the width (w2) and depth (d2) of the second magnetic void are w1 ≧ w2 and d1 ≦ d2, or , W1 ≤ w2, and d1 ≥ d2.

Description

The present invention relates to a rotor structure of a rotating electric machine such as a motor or a generator.

In the rotary electric machine used for driving a vehicle, higher torque is required within a predetermined range as compared with a normal rotary electric machine. In a permanent magnet type rotary electric machine capable of increasing torque within a predetermined range, for example, Patent Document 1 describes a structure of a permanent magnet type rotary electric machine capable of increasing torque.

Japanese Unexamined Patent Publication No. 2011-101504

In a rotary electric machine used for driving a vehicle, the induced voltage at no load is limited due to the relationship with the withstand voltage of peripheral devices. In general, the characteristics of torque, induced voltage and magnetic flux are proportional. Since the induced voltage rises with the torque, the induced voltage may exceed the limit value when the torque exceeds a predetermined value. Therefore, in order to increase the torque of the rotary electric machine, it is required to realize the high torque while suppressing the induced voltage when there is no load.

In the technique described in Patent Document 1, the relationship between such torque and induced voltage has not been sufficiently studied.

An object of the present invention is to provide a rotor of a rotating electric machine capable of increasing torque while suppressing an induced voltage when no load is applied.

In order to solve the above problems, for example, the configuration described in the claims is adopted.

The present application includes a plurality of means for solving the above problems, and one example thereof is a rotary electric machine provided with a rotor in which a permanent magnet is inserted into a magnet insertion hole provided in a double rotor iron core. The permanent magnet has a first end face and a second end face facing in the magnetization direction, and is on the inner wall surface of the magnet insertion hole in the region facing the first end face of the permanent magnet, on the permanent magnet side. The first magnetic gap formed by the protruding convex portion and the inner wall surface of the magnet insertion hole in the region facing the second end surface of the permanent magnet are formed by the convex portion protruding toward the permanent magnet. A second magnetic void is formed, and the width (w1) and depth (d1) of the first magnetic void and the width (w2) and depth (d2) of the second magnetic void are formed. ) Satisfies the relationship of w1 ≧ w2 and d1 ≦ d2, or w1 ≦ w2 and d1 ≧ d2.

According to the present invention, it is possible to provide a rotor of a rotating electric machine capable of increasing torque while suppressing an induced voltage when no load is applied. Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

The schematic block diagram of the hybrid type electric vehicle equipped with the rotary electric machine of this embodiment. The circuit diagram of the power converter 600. Sectional drawing of the rotary electric machine of this embodiment. The r-θ cross-sectional view of the stator 230 and the rotor 250 of this embodiment. An enlarged view of one magnetic pole of the stator 230 and the rotor 250 of the present embodiment. An enlarged view of part B in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotary electric machine according to an embodiment of the present invention. The vehicle 100 is equipped with an engine 120, a first rotary electric machine 200, a second rotary electric machine 202, and a battery 180. The battery 180 supplies DC power to the rotary electric machines 200 and 202 via the power conversion device 600 when the driving force of the rotary electric machines 200 and 202 is required, and receives DC power from the rotary electric machines 200 and 202 during regenerative running. .. The transfer of DC power between the battery 180 and the rotary electric machines 200 and 202 is performed via the power converter 600. Further, although not shown, the vehicle is equipped with a battery that supplies low-voltage power (for example, 14-volt power), and supplies DC power to the control circuit described below.

The rotational torque of the engine 120 and the rotary electric machines 200 and 202 is transmitted to the front wheels 110 via the transmission 130 and the differential gear 160. The transmission 130 is controlled by the transmission control device 134, and the engine 120 is controlled by the engine control device 124. The battery 180 is controlled by the 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.

The integrated control device 170 is a control device higher than the transmission control device 134, the engine control device 124, the power conversion device 600, and the battery control device 184, and is a transmission control device 134, an engine control device 124, and a power conversion device 600. And the information representing each state of the battery control device 184 is received from them via the communication line 174, respectively. The integrated control device 170 calculates a control command of each control device based on the acquired information. The calculated control command is transmitted to each control device via the communication line 174.

The high-voltage battery 180 is composed of a secondary battery such as a lithium-ion battery or a nickel-hydrogen 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 state of each unit cell battery constituting the battery 180 to the integrated control device 170 via the communication line 174.

When the integrated control device 170 determines that the battery 180 needs to be charged based on the information from the battery control device 184, the integrated control device 170 issues an instruction for power generation operation to the power conversion device 600. Further, the integrated control device 170 mainly manages the output torques of the engine 120 and the rotary electric machines 200 and 202, and calculates the total torque and the torque distribution ratio of the output torque of the engine 120 and the output torques of the rotary electric machines 200 and 202. Is performed, and a control command based on the calculation processing result is transmitted to the transmission control device 134, the engine control device 124, and the power conversion device 600. The power conversion device 600 controls the rotary electric machines 200 and 202 so that torque output or generated power as instructed is generated based on a torque command from the integrated control device 170.

The power conversion device 600 is provided with a power semiconductor that constitutes an inverter for operating the rotary electric machines 200 and 202. The power conversion device 600 controls the switching operation of the power semiconductor based on a command from the integrated control device 170. By the switching operation of the power semiconductor, the rotary electric machines 200 and 202 are operated as an electric motor or a generator.

When the rotary electric machines 200 and 202 are operated as electric motors, the DC power from the high-voltage battery 180 is supplied to the DC terminal of the inverter of the power converter 600. The power conversion device 600 controls the switching operation of the power semiconductor, converts the supplied DC power into three-phase AC power, and supplies the DC power to the rotating electric machines 200 and 202. On the other hand, when the rotary electric machines 200 and 202 are operated as a generator, the rotors of the rotary electric machines 200 and 202 are rotationally driven by a rotational torque applied from the outside, and three phases are connected to the stator windings of the rotary electric machines 200 and 202. AC power is generated. The generated three-phase AC power is converted into DC power by the power converter 600, and the DC power is supplied to the high-voltage battery 180 to charge the battery 180.
FIG. 2 shows a circuit diagram of the power conversion device 600 of FIG. The power conversion device 600 is provided with a first inverter device for the rotary electric machine 200 and a second inverter device for the rotary electric machine 202. 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 rotary electric machine 200. .. The drive circuit 652 is provided on the drive circuit board 650.

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 rotary electric machine 202. ing. The drive circuit 656 is provided on the drive circuit board 654. The control circuit 648 provided on the control circuit board 646, the capacitor module 630, and the transmission / reception circuit 644 mounted on the connector board 642 are commonly used by the first inverter device and the second inverter device.

The power modules 610 and 620 operate according to the drive signals output from the corresponding drive circuits 652 and 656, respectively. The power modules 610 and 620 convert the DC power supplied from the battery 180 into three-phase AC power, and supply the power to the stator windings which are the armature windings of the corresponding rotating electric machines 200 and 202. Further, the power modules 610 and 620 convert the AC power induced in the stator windings of the rotary electric machines 200 and 202 into direct current and supply it to the high voltage battery 180.

As shown in FIG. 2, the power modules 610 and 620 include a three-phase bridge circuit, and a series circuit corresponding to the three phases is electrically connected in parallel between the positive electrode side and the negative electrode side of the battery 180, respectively. ing. Each series circuit includes a power semiconductor 21 forming an upper arm and a power semiconductor 21 forming a lower arm, and the power semiconductors 21 are connected in series. As shown in FIG. 2, the power module 610 and the power module 620 have substantially the same circuit configuration, and will be described here as a representative of the power module 610.

In this embodiment, an IGBT (Insulated Gate Bipolar Transistor) 21 is used as the switching power semiconductor element. The IGBT 21 includes 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 includes two electrodes, a cathode electrode and an anode electrode, and the cathode electrode is the collector electrode of the IGBT 21 and the anode electrode is the IGBT 21 so that the direction from the emitter electrode of the IGBT 21 to the collector electrode is forward. Each is electrically connected to the emitter electrode.

A MOSFET (metal oxide semiconductor type field effect transistor) may be used as the switching power semiconductor element. The MOSFET includes three electrodes, a drain electrode, a source electrode, and a gate electrode. In the case of MOSFET, since the parasitic diode in which the direction from the drain electrode to the source electrode is in the forward direction is provided between the source electrode and the drain electrode, it is not necessary to provide the diode 38 in FIG.

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 of each upper and lower arm of each phase is shown, but since the current capacity to be controlled is large, a plurality of IGBTs are actually electrically connected in parallel. ing. In the following, for the sake of simplicity, a single power semiconductor will be described.

In the example shown in FIG. 2, each upper and lower arm of each phase is composed of three IGBTs. The collector electrode of the IGBT 21 of each upper arm of each phase is electrically connected to the positive electrode side of the battery 180, and the source electrode of the IGBT 21 of each lower arm of each phase is electrically connected to the negative electrode side of the battery 180. The midpoint of each arm of each phase (the connection part between the emitter electrode of the upper arm side IGBT and the collector electrode of the lower arm side IGBT) is the armature winding (fixed) of the corresponding phase of the corresponding rotating electric machines 200 and 202. It is electrically connected to the child winding).

The drive circuits 652 and 656 constitute a drive unit for controlling the corresponding inverter devices 610 and 620, and generate a drive signal for driving the IGBT 21 based on the control signal output from the control circuit 648. To do. The drive signals generated by the respective drive circuits 652 and 656 are output to the gates of the respective power semiconductor elements of the corresponding power modules 610 and 620, respectively. The drive circuits 652 and 656 are each provided with six integrated circuits that generate 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.

The control circuit 648 constitutes the control unit of each of the inverter devices 610 and 620, and is composed of a microcomputer that calculates a control signal (control value) for operating (on / off) a plurality of power semiconductor elements for switching. ing. The torque command signal (torque command value) from the host control device, the sensor output of the current sensors 660 and 662, and the sensor output of the rotation sensor mounted on the rotary electric machines 200 and 202 are input to the control circuit 648. The control circuit 648 calculates a control value based on those input signals, and outputs a control signal for controlling the switching timing to the drive circuits 652 and 656.

The transmission / reception circuit 644 mounted on the connector board 642 is for electrically connecting the power conversion device 600 and the external control device, and connects information with other devices via the communication line 174 of FIG. Send and receive. The capacitor module 630 constitutes a smoothing circuit for suppressing fluctuations in the DC voltage caused by the switching operation of the IGBT 21, and is electrically connected to the DC side terminals of the first power module 610 and the second power module 620. They are connected in parallel.

FIG. 3 shows an rZ cross-sectional view of the rotary electric machine 200 of FIG. The rotary electric machine 200 and the rotary electric machine 202 have substantially the same structure, and the structure of the rotary electric machine 200 will be described below as a representative example. However, the structure shown below does not have to be adopted in both the rotary electric machines 200 and 202, and may be adopted in only one of them.

A stator 230 is held inside the housing 212, and the stator 230 includes a stator core 232 and a stator winding 238. A rotor 280 is rotatably held on the inner peripheral side of the stator core 232 via a gap 222. The rotor 280 includes a rotor core 282 fixed to a shaft 218, a permanent magnet 284, and a non-magnetic cover plate 226. The housing 212 has a pair of end brackets 214 provided with bearings 216, and the shaft 218 is rotatably held by these bearings 216.

The shaft 218 is provided with a resolver 224 that detects the position of the pole of the rotor 280 and the rotation speed. The output from the resolver 224 is taken into the control circuit 648 shown in FIG. The control circuit 648 outputs a control signal to the drive circuit 652 based on the captured output. The drive circuit 652 outputs a drive signal based on the control signal to the 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 winding 238 shown in FIG. 3, and a rotating magnetic field is generated in the stator 230. The frequency of the three-phase alternating current is controlled based on the output value of the resolver 224, and the phase of the three-phase alternating current with respect to the rotor 280 is also controlled based on the output value of the resolver 224.

FIG. 4 is a diagram showing an r-θ cross section of the stator 230 and the rotor 250, and is a cross-sectional view taken along the line AA of FIG. In FIG. 4, the description of the housing 212, the shaft 218, and the stator winding 238 is omitted. On the inner peripheral side of the stator core 232, a large number of slots 237 and teeth 236 are evenly arranged over the entire circumference. In FIG. 4, not all of the slots and teeth are coded, but only some of the teeth and slots are represented. A slot insulating material (not shown) is provided in the slot 237, and a plurality of U-phase, V-phase, and W-phase windings constituting the stator winding 238 of FIG. 3 are mounted. In the present embodiment, since the number of slots for each pole and each phase is 2, 48 slots 237 are formed at equal intervals. The number of slots for each pole and each phase is two, that is, the U phase, V phase, and W phase of each slot 237 are U phase, U phase, V phase, V phase, W phase, W phase, and so on in the θ direction. It means that the phases are arranged so as to be lined up one by one, and six slots 237 are used for the U phase, V phase, and W phase of one pole. In the present embodiment, since eight sets of permanent magnets 254, which will be described later, are arranged in the θ direction, the number of slots 237 of the stator core 232 is 48, which is 6 × 8.

In the vicinity of the outer circumference of the rotor core 252, eight sets of a plurality of magnet insertion holes 253 for inserting magnets are arranged at equal intervals along the θ direction. Each magnet insertion hole 253 is formed along the z direction, and a permanent magnet 254 is embedded in the magnet insertion hole 253, and is fixed with a filler such as an adhesive or a resin. The width of the magnet insertion hole 253 in the θ direction is set larger than the width of the permanent magnets 254 (254a, 254b) in the θ direction, and the hole spaces 257 on both sides of the permanent magnet 254 function as magnetic voids. The hole space 257 may be embedded with an adhesive, or may be integrally solidified with the permanent magnet 254 with a molding resin. The permanent magnet 254 acts as a field pole of the rotor 250, and has an 8-pole configuration in this embodiment.

The magnetization direction of the permanent magnet 254 in this embodiment is oriented at right angles to the long side of the permanent magnet 254, and the direction of the magnetization direction is reversed for each field magnetic pole. That is, if the stator side surface of the permanent magnet 254a is the N pole and the shaft side surface is the S pole, the stator side surface of the adjacent permanent magnet 254b is the S pole and the shaft side surface is the N pole. .. Then, these permanent magnets 254a and 254b are alternately arranged in the θ direction.

The permanent magnet 254 may be magnetized and then inserted into the magnet insertion hole 253, or may be magnetized by applying a strong magnetic field after being inserted into the magnet insertion hole 253 of the rotor core 252. However, since the magnetized permanent magnet 254 is a strong magnet, if the magnet is magnetized before the permanent magnet 254 is fixed to the rotor 250, a strong attractive force is applied to the rotor core 252 when the permanent magnet 254 is fixed. Will occur and hinder the assembly work. Further, due to the strong attractive force of the permanent magnet 254, dust such as iron powder may adhere to the permanent magnet 254. Therefore, when considering the productivity of the rotary electric machine, it is preferable to magnetize the permanent magnet 254 after inserting it into the rotor core 252.

As the permanent magnet 254, a neodymium-based or samarium-based sintered magnet, a ferrite magnet, a neodymium-based bonded magnet, or the like can be used. The residual magnetic flux density of the permanent magnet 254 is about 0.4 to 1.45 T.

When a rotating magnetic field is generated in the stator 230 by passing a three-phase alternating current through the stator winding 238, the rotating magnetic field acts on the permanent magnets 254a and 254b of the rotor 250 to generate torque. This torque is represented by the product of the component interlinking each phase winding of the magnetic flux generated from the permanent magnet 254 and the component orthogonal to the interlinking magnetic flux of the alternating current flowing through each phase winding. Here, since the alternating current is controlled to have a sinusoidal shape, the product of the fundamental wave component of the interlinkage magnetic flux and the fundamental wave component of the alternating current becomes the time average component of the torque, and becomes the harmonic component of the interlinkage magnetic flux. The product of the fundamental wave components of the alternating current is the torque ripple, which is the harmonic component of the torque. That is, in order to reduce the torque ripple, the harmonic component of the interlinkage magnetic flux may be reduced.

The torque of the rotating electric machine in which the permanent magnet is embedded in the rotor core is the magnet torque expressed by the product of the magnetic flux of the permanent magnet and the energized current, and the relaxation torque generated by the difference between the d-axis inductance and the q-axis inductance of the rotor. It is represented by the sum of. In order to improve the torque of a rotary electric machine, a method of improving both the magnet torque and the reluctance torque is generally adopted.

The reluctance torque will be described. Generally, the axis through which the magnetic flux passes through the center of the magnet is called the d-axis, and the axis through which the magnetic flux flows from one pole to the other of the magnet is called the q-axis. At this time, the iron core portion at the center between the poles of the magnet is called an auxiliary salient pole portion. Since the magnetic permeability of the permanent magnet 254 provided on the rotor 250 is almost the same as that of air, the d-axis portion is magnetically concave and the q-axis portion is magnetically convex when viewed from the stator side. It has become. Therefore, the iron core portion of the q-axis portion is called a salient pole. The reluctance torque is generated by the difference in the ease of passage of the magnetic fluxes on the d-axis and the q-axis, that is, the salient pole ratio.

In the rotary electric machine of the present embodiment, the reluctance torque is increased by the shape of the magnet insertion hole 253, and the high torque is realized while suppressing the induced voltage when there is no load.

FIG. 5 is an enlarged view of one magnetic pole in the cross-sectional view shown in FIG. The magnetization direction of the permanent magnet 254 is perpendicular to the long side of the permanent magnet 254. Hole spaces 257, which are magnetic voids, are provided at both ends of the permanent magnet 254 orthogonal to the magnetization direction. Further, in this embodiment, the rotor outer peripheral side magnetic gap 258 and the rotor inner peripheral side magnetic gap 259 are provided at both ends in the magnetization direction.

FIG. 6 is an enlarged view of the portion surrounded by B in FIG. The outer peripheral side magnetic gap 258 provided in the inner wall of the magnet insertion hole 253 in the region facing the outer peripheral side end surface 262 of the permanent magnet 254a is a concave portion formed by two convex portions 260. Further, the inner peripheral side magnetic gap 259 provided in the inner wall of the magnet insertion hole 253 in the region facing the inner peripheral side end surface 263 of the permanent magnet 254a is a concave portion formed by the two convex portions 261. Here, the recess forming the outer peripheral side magnetic gap 258 or the inner peripheral side magnetic gap 259 is such that the end face of the permanent magnet and the magnet insertion hole are the most in the region where the end face of the permanent magnet and the magnet insertion hole face each other. It is a region recessed from the apex of the adjacent convex portion to the rotor core side.

By forming magnetic voids 258 and 259 above and below the magnetization direction of the permanent magnet 254 in this way, the region of the void having a large magnetic resistance increases, and as a result, the magnetic resistance of the magnetic flux passing through the d-axis increases. As a result, the reluctance torque can be increased because it is more magnetically dented and the difference in ease of passage of magnetic flux is created.

On the other hand, the induced voltage at no load is proportional to the magnetic flux of the magnet, and the larger the magnetic flux of the magnet, the higher the induced voltage at no load. In the rotary electric machine of the present embodiment, by providing the magnetic gaps 258 and 259, the air gap is artificially widened, and the magnet torque and the induced voltage at no load are reduced. In other words, since the magnetic flux of the permanent magnet is weakened by the magnetic voids 258 and 259, it is possible to suppress an increase in the induced voltage when there is no load, which is affected by the magnetic flux. As for the torque of the rotary electric machine, the magnet torque decreases, but the decrease in torque can be suppressed as a whole by increasing the reluctance torque. By relatively improving the reluctance torque that does not affect the induced voltage when there is no load in this way, it is possible to realize a high torque while suppressing the induced voltage when there is no load.

Next, the shapes of the outer peripheral side magnetic gap 258 and the inner peripheral side magnetic gap 259 will be described. As shown in FIG. 6, the width in the direction perpendicular to the magnetization direction of the outer peripheral side magnetic void 258 is w1, the depth in the direction parallel to the magnetization direction is d1, and the inner peripheral side magnetic void 259 is relative to the magnetization direction. The width in the vertical direction is described as w2, and the depth in the direction parallel to the magnetization direction is described as d2. As for the shape of the magnetic gap 258 on the outer peripheral side located on the stator side, a change in magnetic flux density due to the shape tends to affect the generation of trickle. This is because the harmonics become large due to the density of the magnetic flux on the outer peripheral side end surface 262 where the magnetic flux of the permanent magnet 254a is generated, and the torque ripple tends to deteriorate. Therefore, it is desirable that the width w1 of the magnetic gap 258 on the outer peripheral side be set as wide as possible and the depth d1 be set shallow so that the shape easily suppresses the occurrence of trickle. Then, the magnetic gap required for improving the reluctance torque is set as the depth d2 of the inner peripheral side magnetic gap 259. Further, the width w2 of the inner peripheral side magnetic gap 259 is preferably set as wide as possible as the width w1 of the outer peripheral side magnetic gap 258, but the positioning portion of the permanent magnet 254 (for example, the inner peripheral side end surface 263). If there is a limitation due to (convex parts) for defining the positions of both ends of the magnet, it may be set narrower. When the width w2 is narrower than the width 1, it is preferable to set the depth d2 deeper than the depth d1. From the above, it is preferable that w1 ≧ w2 and d1 ≦ d2 as the relationship between the depth and the width of each. Further, from the viewpoint of reducing trickle, it is more desirable that w1 ≧ w2 and d1 <d2. By providing the outer peripheral side magnetic gap 258 and the inner peripheral side magnetic gap 259 in this way, it is possible to achieve high torque and low torque ripple while suppressing the induced voltage when there is no load.

Further, from the viewpoint of increasing the torque while suppressing the increase in the induced voltage when there is no load, the relationship between the depth and the width is w1 ≤ w2, which is the opposite of the above, and d1 ≥ d2, and further. Can be w1 ≤ w2 and d1> d2.

In this embodiment, the outer peripheral side magnetic gap 258 and the inner peripheral side magnetic gap 259 are each formed by two convex portions (260 or 261), but the same applies even if there are two or more convex portions. The effect of can be obtained.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, 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. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

200 ... Rotor machine 230 ... Stator 232 ... Stator core 238 ... Stator winding 250, 280 ... Rotor 252 ... Rotor core 253 ... Magnet insertion hole 254 ... Permanent magnet 257 ... Hole space 258 ... Outer peripheral side magnetic gap 259 ... Inner peripheral side magnetic gap 260, 261 ... Convex part

Claims (4)

Rotor A rotor of a rotating electric machine having a configuration in which a permanent magnet is inserted into a magnet insertion hole provided in an iron core.
The permanent magnet has a first end face and a second end face facing each other in the magnetization direction.
A first magnetic void formed by a recess on the inner wall surface of the magnet insertion hole in a region facing the first end face of the permanent magnet,
A rotor of a rotating electric machine, characterized in that a second magnetic gap formed by a recess on the inner wall surface of a magnet insertion hole in a region facing the second end surface of the permanent magnet is formed. In claim 1,
The width (w1) and depth (d1) of the first magnetic void, the width (w2) and depth (d2) of the second magnetic void are w1 ≧ w2 and d1 ≦ d2, or , W1 ≤ w2, and d1 ≥ d2, a rotor of a rotating electric machine. In claim 1,
The width (w1) and depth (d1) of the first magnetic void, the width (w2) and depth (d2) of the second magnetic void are w1 ≧ w2 and d1 <d2, or , W1 ≤ w2, and d1> d2, which is a rotor of a rotating electric machine. The rotor according to any one of claims 1 to 3 and a stator having a stator core and a stator winding are provided, and the rotor is rotatably arranged in the stator core through a gap. Rotating electric machine.

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