JP7113003B2 - Rotor of rotary electric machine and rotary electric machine provided with the same - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotating electrical machine such as a motor or a generator, and a rotating electrical machine having the same.

Motors used for driving automobiles are required to have high rotation speed and high torque. As shown in Patent Document 1, in order to improve the torque, the rotor mounted on the motor has a width w1 of the magnetic path between the two flux barriers and a width between the flux barrier and the edge of the outer peripheral flux barrier. describes a technique of arranging flux barriers so as to satisfy the relationship w1≧w2, where w2 is the width of the magnetic path.

However, it is insufficient as a configuration for considering the demagnetization resistance when a plurality of permanent magnets are arranged while maintaining the high torque performance of the motor.

Japanese Patent Application Laid-Open No. 2006-314152

SUMMARY OF THE INVENTION An object of the present invention is to improve the demagnetization resistance when a plurality of permanent magnets are arranged while maintaining the high torque performance of the motor.

A rotary electric machine rotor according to the present invention is a rotary electric machine rotor that forms a first space that houses a first magnet and a second space that houses a second magnet, wherein the first space and The thickness of the bridge that is the smallest part of the outer circumference of the rotor core is larger than the thickness of the bridge that is the smallest part of the circumference of the rotor core and the second space, and the second magnet has the outermost part of the second magnet. The second space is arranged to be inside the innermost part of the first magnet, and the second space is configured by a third space and a fourth space that are formed apart from each other and that respectively accommodate the second magnet, The third space and the fourth space form a V shape, the first space is formed between the third space and the fourth space, and the first magnet and the second magnet are , each of which has a rectangular shape in a cross section perpendicular to the axial direction, and the long sides of each of the rectangles facing each other when housed in the first space, the third space, and the fourth space are in the shape of ▽. The third space and the fourth space are divided by a bridge portion into a storage portion that stores the second magnet and a gap that faces the storage portion, and the bridge portion In each of the three spaces and the fourth space, one short side of the rectangular second magnet that is closer to the outer circumference of the rotor iron core out of the two short sides of the second magnet is arranged parallel to the short side of the second magnet. are provided one by one .

According to the present invention, it is possible to improve the demagnetization resistance when a plurality of permanent magnets are arranged while maintaining the high torque performance of the motor.

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; FIG. 2 is a circuit diagram of the power conversion device 600 of FIG. 1; FIG. 2 is a partial cross-sectional view of the rZ cross section of rotating electric machine 200 shown in FIG. 1. FIG. FIG. 4 is a view showing r-θ cross sections of the stator 230 and the rotor 250, and shows the AA cross-sectional view of FIG. 3; 5 is a partially enlarged view showing one magnetic pole portion of the cross-sectional view of the rotor 280 and the stator 230 shown in FIG. 4; FIG. It is the partial enlarged view which expanded and showed one magnetic pole part of sectional drawing of the rotor 280 and stator 230 which concern on other embodiment.

Embodiments for carrying out the present invention will be described below with reference to the drawings.

This embodiment is suitable as a driving motor for an electric vehicle, for example. The rotating electrical machine according to the present invention can be applied to a pure electric vehicle that runs only by a rotating electrical machine and a hybrid electric vehicle that is driven by both an engine and a rotating electrical machine. explain.

FIG. 1 is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotating electric machine according to one embodiment of the present invention. Vehicle 100 is equipped with engine 120 , first rotating electrical machine 200 , second rotating electrical machine 202 , and battery 180 .

Battery 180 supplies DC power to first rotating electrical machine 200 and second rotating electrical machine 202 via power conversion device 600 when driving power from first rotating electrical machine 200 and second rotating electrical machine 202 is required. Further, battery 180 receives DC power from first rotating electrical machine 200 and second rotating electrical machine 202 during regenerative running.

Transfer of DC power between battery 180 and first rotating electrical machine 200 and second rotating electrical machine 202 is performed via power conversion device 600 . Although not shown, the vehicle is equipped with a battery that supplies low-voltage power (for example, 14-volt system power), and supplies DC power to the control circuit described below.

Rotational torque generated by engine 120 , first rotating electrical machine 200 and second rotating electrical machine 202 is transmitted to front wheels 110 via transmission 130 and differential gear 160 . Transmission 130 is controlled by transmission controller 134 and engine 120 is controlled by engine controller 124 .

Battery 180 is controlled by battery controller 184 . Transmission control device 134 , engine control device 124 , battery control device 184 , power conversion device 600 and integrated control device 170 are connected by 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 information representing the respective states of the battery controller 184 from each of them via the communication line 174 . The integrated control device 170 calculates control commands for 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 V to 600 V or higher. The battery control device 184 outputs the charge/discharge status of the battery 180 and the status 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, it instructs the power conversion device 600 to start the power generation operation. Integrated control device 170 mainly manages the output torque of engine 120, first rotating electric machine 200 and second rotating electric machine 202, and controls the output torque of engine 120 and the output of first rotating electric machine 200 and second rotating electric machine 202. Arithmetic processing of torque, total torque, and torque distribution ratio is performed, and a control command based on the results of the arithmetic processing is transmitted to transmission control device 134 , engine control device 124 and electric power conversion device 600 . Power conversion device 600 controls first rotating electric machine 200 and second rotating electric machine 202 based on a torque command from integrated control device 170 so as to generate torque output or generated electric power according to the command.

Power converter 600 is provided with a power semiconductor that constitutes an inverter for driving first rotating electrical machine 200 and second rotating electrical machine 202 . Power conversion device 600 controls the switching operation of power semiconductors based on commands from integrated control device 170 . Due to the switching operation of the power semiconductor, the first rotating electric machine 200 and the second rotating electric machine 202 are operated as electric motors or as generators.

When first rotating electrical machine 200 and second rotating electrical machine 202 are operated as electric motors, DC power from high-voltage battery 180 is supplied to the DC terminal of the inverter of power conversion device 600 . The power conversion device 600 controls the switching operation of the power semiconductor to convert the supplied DC power into three-phase AC power, and supplies the three-phase AC power to the first rotating electric machine 200 and the second rotating electric machine 202 .

On the other hand, when the first rotating electrical machine 200 and the second rotating electrical machine 202 are operated as generators, the rotors of the first rotating electrical machine 200 and the second rotating electrical machine 202 are rotationally driven by a rotational torque applied from the outside. Three-phase AC power is generated in the stator windings of the first rotating electrical machine 200 and the second rotating electrical machine 202 . 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, whereby the battery 180 is charged.

FIG. 2 shows a circuit diagram of the power converter 600 of FIG. Power conversion device 600 is provided with a first inverter device for first rotating electrical machine 200 and a second inverter device for second rotating electrical 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. there is The drive circuit 656 is provided on the drive circuit board 654 .

A control circuit 648 provided on a control circuit board 646, a capacitor module 630, and a transmitting/receiving circuit 644 mounted on a connector board 642 are commonly used by the first inverter device and the second inverter device.

The power modules 610 and 620 are operated by drive signals output from the corresponding first drive circuit 652 and second drive circuit 656, respectively. Power modules 610 and 620 each convert DC power supplied from battery 180 into three-phase AC power, and apply the power to stators, which are armature windings of first rotating electric machine 200 and second rotating electric machine 202, respectively. supply the windings. Power modules 610 and 620 also convert AC power induced in the stator windings of first rotating electrical machine 200 and second rotating electrical machine 202 into DC power, and supply the DC power to battery 180 .

The power modules 610 and 620 have 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, respectively. It is Each series circuit includes a power semiconductor 21 forming an upper arm and a power semiconductor 21 forming 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.

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. They are electrically connected to emitter electrodes, respectively.

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, since a parasitic diode is provided between the source electrode and the drain electrode and the forward direction is the direction from the drain electrode to the source electrode, there is no need to provide the diode 38 in FIG.

Each phase arm is configured by electrically connecting an emitter electrode of the IGBT 21 and a collector electrode of the IGBT 21 in series. In this embodiment, only one IGBT is shown for each upper and lower arm of each phase. However, since the current capacity to be controlled is large, a plurality of IGBTs are actually connected electrically in parallel. ing. In the following description, one power semiconductor will be described for the sake of simplicity.

In the example shown in FIG. 2, each upper and lower arm of each phase is composed of three IGBTs. The collector electrode of each upper arm IGBT 21 of each phase is electrically connected to the positive electrode side of the battery 180 , and the source electrode of each lower arm IGBT 21 of each phase is electrically connected to the negative electrode side of the battery 180 . The midpoint of each arm of each phase (the connecting portion between the emitter electrode of the upper arm side IGBT and the collector electrode of the lower arm side IGBT) is the corresponding phase of the corresponding first rotating electrical machine 200 or second rotating electrical machine 202 . It is electrically connected to the armature winding (stator winding).

The first drive circuit 652 and the second drive circuit 656 constitute a drive section for controlling the corresponding power modules 610 and 620, and drive the IGBT 21 based on the control signal output from the control circuit 648. to generate a drive signal for

The drive signals generated by each of the first drive circuit 652 and the second drive circuit 656 are output to the gates of the power semiconductors 21 of the corresponding power modules 610 and 620, respectively. The first drive circuit 652 and the second drive circuit 656 are each provided with six integrated circuits for generating drive signals to be supplied to the gates of the upper and lower arms of each phase. It is configured.

The control circuit 648 constitutes a control section of each of the power modules 610 and 620, and is composed of a microcomputer that calculates control signals (control values) for operating (turning on/off) a plurality of switching power semiconductor elements. It is A control circuit 648 receives a torque command signal (torque command value) from a host controller, sensor outputs of current sensors 660 and 662, and sensor outputs of rotation sensors mounted on first rotating electrical machine 200 and second rotating electrical machine 202. is entered. The control circuit 648 calculates control values based on those input signals and outputs control signals for controlling switching timing to the first drive circuit 652 and the second drive circuit 656 .

A transmitting/receiving circuit 644 mounted on the connector board 642 is for electrically connecting between the power conversion device 600 and an external control device, and communicates information with other devices via the communication line 174 in 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 in parallel to the DC side terminals of the power modules 610 and 620. .

FIG. 3 is a partial cross-sectional view of the rZ cross section of first rotating electric machine 200 shown in FIG. Note that the first rotating electrical machine 200 and the second rotating electrical machine 202 have substantially the same structure, and the structure of the first rotating electrical machine 200 will be described below as a representative example. However, the structure described below need not be employed in both the first rotating electrical machine 200 and the second rotating electrical machine 202, and may be employed in only one of them.

A stator 230 is held inside the housing 212 . Stator 230 includes a stator core 232 and stator windings 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 the shaft 218, permanent magnets 284, and a cover plate 226 of non-magnetic material.

The housing 212 has a pair of end brackets 214 provided with bearings 216, and a shaft 218 is rotatably held by these bearings 216. As shown in FIG.

The shaft 218 is provided with a resolver 224 that detects the pole position and rotational speed of the rotor 280 . The output from this resolver 224 is taken into the control circuit 648 shown in FIG.

Control circuit 648 outputs a control signal to drive circuit 652 based on the captured output. Drive circuit 652 outputs a drive signal based on the control signal to power module 610 . Power module 610 performs a switching operation based on a control signal to convert DC power supplied from 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. FIG. 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 similarly controlled based on the output value of the resolver 224.

FIG. 4 is a diagram showing the r-θ section of the stator 230 and the rotor 250, and shows the AA section of FIG. Note that the illustration of the housing 212, the shaft 218, and the stator winding 238 is omitted in FIG.

A large number of slots 237 and teeth 236 are evenly arranged along the inner circumference of the stator core 232 . In FIG. 4, not all the slots and teeth are labeled, but only some of the teeth and slots are labeled as a representative.

A slot insulating material (not shown) is provided in the slot 237, and a plurality of phase windings of U-phase, V-phase, and W-phase constituting the stator winding 238 of FIG. 3 are mounted. In this embodiment, since the number of slots per phase per pole is 2, 48 slots 237 are formed at regular intervals. The number of slots per pole per phase means that the U phase, V phase, and W phase of each slot 237 are arranged in the θ direction (circumferential direction) in the U phase, U phase, V phase, V phase, W phase, W phase, . ., and 2 phases are arranged in a row, and six slots 237 are used for the U phase, V phase, and W phase of one pole. In the present embodiment, the number of slots 237 in the stator core 232 is 48 (6×8) because the permanent magnets 254, which will be described later, have eight poles arranged in eight pairs in the θ direction.

A plurality of holes 253 for inserting the permanent magnets 254 are arranged in eight pairs at regular intervals along the θ direction near the outer circumference of the rotor core 252 . Each hole 253 is formed along the z-direction (axial direction), and a permanent magnet 254 is embedded in each hole 253 and fixed with a filler such as adhesive or resin.

The width of the hole 253 in the θ direction is set larger than the width in the θ direction between the permanent magnets 254a and 254b, and the hole spaces 257 on both sides of the permanent magnet 254 function as magnetic gaps. This hole space 257 may be filled with an adhesive, or may be integrally fixed with the permanent magnet 254 with molding resin.

The permanent magnets 254 act as field poles of the rotor 250 and have an 8-pole configuration in this embodiment.

The magnetization direction of the permanent magnet 254 in this embodiment is perpendicular to the long side of the permanent magnet 254, and the magnetization direction is reversed for each field pole. That is, if the stator side surface of the permanent magnet 254a is the north pole and the shaft side surface is the south pole, the adjacent permanent magnet 254b has the stator side surface of the south pole and the shaft side surface of the north pole. . These permanent magnets 254a and 254b are alternately arranged in the θ direction.

The permanent magnets 254 may be inserted into the holes 253 after being magnetized, or may be magnetized by applying a strong magnetic field after being inserted into the holes 253 of the rotor core 252 . However, since the magnetized permanent magnet 254 is a strong magnet, if the magnet is magnetized before fixing the permanent magnet 254 to the rotor 250, a strong attractive force between the permanent magnet 254 and the rotor core 252 is generated when the permanent magnet 254 is fixed. is generated and interferes with the assembly work. Also, due to the strong attractive force of the permanent magnet 254, dust such as iron powder may adhere to the permanent magnet 254. FIG. Therefore, considering the productivity of the rotating electric machine, it is preferable to magnetize the permanent magnets 254 after inserting them 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 0.4-1.45T.

When a rotating magnetic field is generated in the stator 230 by applying a three-phase alternating current to the stator windings 238, this 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 of the magnetic flux output from the permanent magnet 254 interlinking with each phase winding and the component orthogonal to the interlinking magnetic flux of the alternating current flowing in each phase winding.

Here, since the alternating current is controlled to have a sine wave shape, the product of the fundamental wave component of the interlinkage magnetic flux and the fundamental wave component of the alternating current is the time average component of the torque, and the harmonic component of the interlinkage magnetic flux is 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 components of the interlinkage magnetic flux should be reduced. In other words, since the induced voltage is the product of the interlinkage magnetic flux and the rotational angular velocity of the rotor, reducing the harmonic component of the interlinkage flux is equivalent to reducing the harmonic component of the induced voltage.

FIG. 5 is a partially enlarged view showing one magnetic pole in the cross-sectional view shown in FIG.

The magnet insertion hole 253 forms a first insertion hole 253a that houses the first permanent magnet 254a1 and two second insertion holes 253b that respectively house the two second permanent magnets 254a2.

A first magnetic gap 257a is formed outside the magnetic pole of the first permanent magnet 254a1 and near both ends of the first permanent magnet 254a1. A second magnetic gap 257b is formed outside the magnetic pole of the second permanent magnet 254a2. As a result, cogging torque and torque pulsation during energization are reduced.

The second insertion holes 253b are V-shaped, and the first insertion holes 253a are formed between the second insertion holes 253b. The two second insertion holes 253b are symmetrical with respect to the d-axis 300, are formed apart from each other, and house the second permanent magnets 254a2 therein.

Although the two second insertion holes 253b are formed separately in this embodiment, the insertion holes may be connected to each other across the d-axis 300 . The ∇ arrangement in which such magnet insertion holes and permanent magnets are arranged provides higher torque than the V-shaped arrangement of permanent magnets. However, with respect to the demagnetization of the permanent magnets, unless the plurality of permanent magnets are arranged in a well-balanced manner, only some of the magnets are extremely likely to be demagnetized.

In the case of the ∇ arrangement in this embodiment, the magnetic flux generated by the stator 230 is easily received by the first permanent magnets 254a1 and easily demagnetized.

Therefore, in the present embodiment, the bridge thickness W1, which is the smallest portion between the first insertion hole 253a and the outer circumference of the rotor core 252, is set to the bridge thickness W1, which is the smallest portion between the second insertion hole 253b and the outer circumference of the rotor core 252. It is formed to be larger than the height W2.

Furthermore, the outermost part of the second permanent magnet 254a2 is arranged to be inside the innermost part of the first permanent magnet 254a1.

This prevents the magnetic flux from the stator 230 from concentrating on either the first permanent magnet 254a1 or the second permanent magnet 254a2, and maintains the high torque performance of the ∇ arrangement while maintaining the first permanent magnet 254a1 and the second permanent magnet 254a1. The permanent magnet 254a2 can have the same demagnetization resistance.

Further, when projected from a direction parallel to the direction of the magnetic flux generated from the second permanent magnet 254a2, the second permanent magnet 254a2 is projected so that the projected portion of the outer peripheral side end portion 258 of the second permanent magnet 254a2 overlaps the first insertion hole 253a. A permanent magnet 254a2 is formed. As a result, the first permanent magnet 254a1 and the second permanent magnet 254a2 can have the same demagnetization resistance while maintaining the high torque performance of the ∇ arrangement.

In this embodiment, the first permanent magnet 254a and the second permanent magnet 254b are accommodated in the first insertion hole 254a1 and the second insertion hole 254a2, respectively. performance can be obtained.

FIG. 6 is a partially enlarged view showing one magnetic pole portion of the cross-sectional view of the rotor 280 and the stator 230 according to another embodiment.

A difference from the embodiment shown in FIG. 5 is that a mechanical bridge is provided between the second insertion hole 253b where the second permanent magnet 254a2 is accommodated and the magnetic air gap 257b in order to increase the mechanical strength. The point is that the portion 259 is provided.

This provides support when the rotor 250 rotates, making it possible to achieve a higher rotational speed than the configuration of FIG. In order to further increase the mechanical strength, a plurality of mechanical bridge portions 259 may be provided.

In addition, 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 in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace part of the configuration of each embodiment with another configuration.

21 power semiconductor or IGBT 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 First rotating electric machine 202 Second rotating electric machine 174 Communication line 180 Battery 200 First rotating electric machine 202 Second 2 rotary electric machine 212 housing 214 end bracket 216 bearing 218 shaft 222 gap 224 resolver 226 cover plate 230 stator 232 stator core 236 tooth 237 Slot 238 Stator winding 253 Hole 253a First insertion hole 254 Permanent magnet 254a Permanent magnet 254a1 First permanent magnet 254a2 Second permanent magnet 253b Second insertion Hole 254b Permanent magnet 257 Hole space 257a First magnetic gap 257b Second magnetic gap 258 Outer peripheral end 259 Bridge 280 Rotor 282 Rotor core , 284... Permanent magnet 300... d-axis 600... Power converter 610... Power module 620... Power module 630... Capacitor module 642... Connector board 644... Transmission/reception circuit 646... Control circuit board 648... Control circuit 650 Drive circuit board 652 First drive circuit 654 Drive circuit board 656 Second drive circuit 660 Current sensor 662 Current sensor

Claims (5)

A rotor of a rotating electric machine that forms a first space that houses a first magnet and a second space that houses a second magnet,
A bridge thickness, which is the narrowest part between the first space and the outer circumference of the rotor core, is larger than a bridge thickness, which is the narrowest part between the second space and the outer circumference of the rotor core,
The second magnet is arranged such that the outermost part of the second magnet is inside the innermost part of the first magnet,
The second space is configured by a third space and a fourth space which are separated from each other and accommodate the second magnet, respectively, and the third space and the fourth space form a V shape. is,
The first space is formed between the third space and the fourth space,
The first magnet and the second magnet each have a rectangular shape in a cross section perpendicular to the axial direction, and face each other when housed in the first space, the third space, and the fourth space, respectively. The long sides of each rectangle are arranged in the shape of ▽,
The third space and the fourth space are divided by a bridge portion into a storage portion that stores the second magnet and a gap portion that faces the storage portion, and
In each of the third space and the fourth space, the bridge portion is provided on the short side of the rectangular second magnet that is closer to the outer circumference of the rotor core, of the two short sides of the second magnet. A rotor of a rotary electric machine provided one by one in parallel with the short side of the rotor. A rotor of a rotary electric machine according to claim 1,
When projected from a direction parallel to the direction of the magnetic flux generated from the second magnet,
A rotor of a rotary electric machine, wherein the second magnet is arranged such that a projected portion of an outer diameter side end portion of the second magnet overlaps a projected portion of the first magnet storage space. A rotor of a rotary electric machine according to claim 1 or 2,
A rotor of a rotary electric machine, wherein the first magnet is composed of a plurality of magnets divided in a circumferential direction. A rotor of a rotary electric machine according to any one of claims 1 to 3,
A rotor of a rotary electric machine, wherein a bridge thickness, which is the narrowest part between the second space and the outer circumference of the rotor core, is defined by the distance between the air gap and the outer circumference of the rotor core. A rotary electric machine comprising the rotor according to any one of claims 1 to 4, comprising a stator facing the rotor in a radial direction with a gap therebetween.

Images