JP2022150091A - Rotor, rotary electric device, driving device, and mobile body - Google Patents

Abstract

To provide a technique attaining reduction of torque ripple and improvement of manufacture efficiency for a rotor having a skew structure.SOLUTION: A first rotor core 11 and a second rotor core, which are aligned in an axial direction and arranged with magnet poles thereof positioned deviated from each other in a circumferential direction, comprise: a pair of first magnets 13; and a pair of first magnet storage holes 14 in which the first magnets are stored. A flux barrier of the first rotor core includes a first flux barrier 31 and a second flux barrier 32 which are overlapped with the first magnet storage holes of the second rotor core in the axial direction. An imaginary line connecting an intermediate position of the pair of first magnets in the circumferential direction with a central axis is defined to be a first axis J1, and an imaginary line being adjacent with the first axis in the circumferential direction and magnetically orthogonal with the first axis and passing the central axis is defined to be a second axis J2. The first flux barrier is disposed between the first axis and the first magnet in the circumferential direction, and the second flux barrier is disposed on the second axis.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to rotors, rotating electric machines, driving devices, and moving bodies.

Conventionally, a rotor laminated core manufactured by fixing permanent magnets to a laminate by resin sealing is known (see, for example, Patent Document 1). Further, in a rotating electric machine having a permanent magnet rotor, the rotor is given a skew structure in order to reduce cogging torque (see, for example, Patent Document 2). In the skew structure, the laminated rotor core is divided into a plurality of pieces together with the permanent magnets in the lamination direction, and each divided rotor core is assembled with a predetermined angle.

Permanent magnets are inserted into the magnet insertion portion of the rotor core and fixed by bonding with a filler. In the skew structure, the positions of the magnet insertion parts are shifted between the split rotor cores. may not be satisfied. For this reason, conventionally, filling of the filler into the magnet inserting portion is performed for each divided stage. In this case, it is necessary to repeat the work for the number of divided stages, and there is a concern that the manufacturing process will become complicated.

For this reason, it has a skewed rotor core that is divided into a plurality of stages in the axial direction and arranged with a phase angle in the circumferential direction between each stage, and permanent magnets that create poles. It is known that the rotor has the following configuration (see Patent Document 2, for example). The rotor core has insertion holes for inserting permanent magnets and at least one intermediate hole provided between the poles independently of the insertion holes. A rotor core insertion hole in one stage communicates with an intermediate hole in an adjacent stage. According to this configuration, since the intermediate hole can secure the supply route of the filler to the insertion hole of the permanent magnet, the rotor having the skewed rotor core can be manufactured at low cost.

JP 2007-282392 A JP 2011-55641 A

In the case of the configuration in which the intermediate holes are provided between the poles formed by the permanent magnets as described above, the intermediate holes may affect magnetic characteristics such as torque ripple depending on, for example, the angle or skew angle of the permanent magnets.

An object of the present disclosure is to provide a technique capable of reducing torque ripple and improving manufacturing efficiency in a rotor having a skew structure.

An exemplary rotor of the present disclosure is a rotor that rotates about a central axis, and has a first rotor core and a second rotor core that are arranged axially and whose magnetic pole positions are circumferentially offset from each other. . Each of the first rotor core and the second rotor core is arranged in a V-shape in which the interval in the circumferential direction increases toward the radially outer side, and the pair of first magnets that constitute the magnetic poles; and a pair of first magnet housing holes for housing the first magnets. The first rotor core further has a plurality of axially penetrating flux barriers. The plurality of flux barriers have a first flux barrier and a second flux barrier that at least partially overlap with the first magnet housing hole of the second rotor core in the axial direction. In plan view from the axial direction, a virtual line connecting the intermediate position of the pair of first magnets in the circumferential direction and the central axis is defined as a first axis, and the first axis is adjacent to the first axis in the circumferential direction. A virtual line magnetically orthogonal to and passing through the central axis is defined as a second axis. The first flux barrier is arranged circumferentially between the first shaft and the first magnet, and the second flux barrier is arranged on the second shaft.

An exemplary rotating electrical machine of the present disclosure has a rotor configured as described above and a stator arranged radially outward of the rotor.

An exemplary drive device of the present disclosure includes the rotating electric machine having the above configuration and a gear unit connected to the rotating electric machine.

An exemplary moving body of the present disclosure includes the driving device configured as described above, and a moving operation unit connected to the driving device and capable of moving itself.

According to the present disclosure, it is possible to reduce torque ripple and improve manufacturing efficiency in a rotor having a skew structure.

FIG. 1 is a schematic diagram showing the configuration of a moving body according to an embodiment of the present disclosure. FIG. 2 is a diagram schematically showing the configuration of the driving device according to the embodiment of the present disclosure. FIG. 3 is a side view schematically showing the configuration of the rotor according to the first embodiment of the present disclosure; FIG. 4 is a plan view showing a schematic configuration of a first rotor core included in the rotor according to the first embodiment. FIG. 5 is a plan view schematically showing the detailed configuration of the first rotor core shown in FIG. 4. FIG. FIG. 6 is a diagram showing the relationship between the first rotor core shown in FIG. 5 and a second rotor core arranged below the first rotor core. FIG. 7 is a plan view schematically showing the configuration of part of the first rotor core after resin is injected. FIG. 8 is a diagram for explaining the details of the arrangement of the first flux barrier and the second flux barrier. FIG. 9 is a graph showing experimental results for explaining the placement of the second flux barrier. FIG. 10 is a plan view showing the configuration of the first rotor core of the rotor according to the second embodiment. FIG. 11 is a diagram showing the relationship between the first rotor core shown in FIG. 10 and a second rotor core arranged below the first rotor core. FIG. 12 is a plan view schematically showing the configuration of part of the first rotor core after resin is injected. FIG. 13 is a diagram for explaining the details of the arrangement of a plurality of flux barriers included in the first rotor core of the second embodiment. FIG. 14 is a graph showing experimental results for explaining the arrangement of the third flux barrier. FIG. 15 is a first graph showing experimental results for explaining the arrangement of the fourth flux barrier. FIG. 16 is a second graph showing experimental results for explaining the arrangement of the fourth flux barrier. FIG. 17 is a diagram for explaining a second rotor core included in the rotor of the second embodiment.

Exemplary embodiments of the present disclosure are described in detail below with reference to the drawings. In this specification, when describing the rotating electrical machine and the rotor, the direction in which the central axis A of the rotating electrical machine 100 shown in FIG. The directions and circumferential directions will be simply referred to as "radial" and "circumferential". In addition, in this specification, when describing the rotor, the axial direction when rotating electric machine 100 is arranged in the direction shown in FIG. 2 is defined as the vertical direction. In this specification, the clockwise circumferential side is defined as one side in the circumferential direction, and the counterclockwise circumferential side is defined as the other side in the circumferential direction when viewed from above in the axial direction. It should be noted that the definitions of the vertical direction, one side and the other side in the circumferential direction are names used merely for explanation, and do not limit actual positional relationships and directions.

<1. Moving Body, Driving Device, and Rotating Electric Machine>
FIG. 1 is a schematic diagram showing the configuration of a mobile object 300 according to an embodiment of the present disclosure. In this embodiment, the mobile object 300 is an automobile. However, the moving body 300 may be a vehicle other than an automobile, a ship, an aircraft, a robot, or the like. As shown in FIG. 1 , the moving body 300 has a driving device 200 and a moving operation section 301 .

The moving operation unit 301 is connected to the driving device 200 and makes itself 300 movable. Specifically, the moving motion unit 301 is a wheel fixed to an axle 302 . The axle 302 may be, for example, connected to the drive device 200 or included in the drive device 200 . The moving motion unit 301 rotates about the axle 302 by being driven by the driving device 200 . The moving body 300 moves according to the rotation of the moving operation unit 301 .

It should be noted that the driving device 200 may be arranged on any part of the moving body 300 as long as it can be directly or indirectly connected to the moving operation unit 301 . The driving device 200 may be a device constituting a so-called in-wheel motor.

FIG. 2 is a diagram schematically showing the configuration of the driving device 200 according to the embodiment of the present disclosure. As shown in FIG. 2 , the driving device 200 has a rotating electrical machine 100 and a gear unit 201 connected to the rotating electrical machine 100 .

In this embodiment, the rotating electric machine 100 is a motor. Drive device 200 has an inverter (not shown) that supplies electric power to rotating electric machine 100 . However, the technology of the present disclosure may be applied to a configuration in which a rotating electrical machine is used as a generator. The rotating electric machine 100 has a rotor 10 and a stator 20 arranged radially outward of the rotor 10 . That is, the rotating electrical machine 100 of the present embodiment is an inner rotor type rotating electrical machine.

The rotor 10 rotates around the central axis A. As shown in FIG. The rotor 10 is cylindrical with the central axis A as the center. The rotor 10 has field magnets embedded therein, as will be described later in detail. That is, the rotary electric machine 100 is an IPM (Interior Permanent Magnet) type rotary electric machine.

Stator 20 is an armature of rotating electric machine 100 . The stator 20 has a cylindrical shape centered on the central axis A. As shown in FIG. The stator 20 faces the rotor 10 arranged radially inward with a gap therebetween and surrounds the rotor 10 . Specifically, the stator 20 has a stator core 21 and coils 22 . Stator core 21 has a cylindrical core back 211 extending in the axial direction and a plurality of teeth 212 extending radially inward from core back 211 . The coil 22 is configured by winding a conductive wire around the teeth 212 of the stator core 21 via an insulator (not shown). When the drive current is supplied to the coils 22 , radial magnetic flux is generated in the teeth 212 of the stator core 21 . As a result, a torque is generated in the rotor 10 in the circumferential direction, and the rotor 10 rotates about the central axis A. As shown in FIG.

The rotary electric machine 100 further has a columnar shaft 40 extending in the axial direction. The shaft 40 is arranged radially inward of the rotor 10 and fixed to the rotor 10 . The shaft 40 rotates around the central axis A together with the rotor 10 . In this embodiment, the upper end of shaft 40 is inserted into casing 2011 of gear unit 201 . Gear unit 201 has a plurality of gears 2012 within its casing 2011 . When shaft 40 rotates, the rotational force of shaft 40 is transmitted to axle 302 by gears 2012 .

In this embodiment, the rotary electric machine 100 is connected to the moving operation section 301 via the gear unit 201 , but may be directly connected to the moving operation section 301 .

As will be described later, according to the present disclosure, the rotor 10 having the skew structure can be manufactured at low cost while reducing torque ripple. Therefore, the rotary electric machine 100 having the rotor 10, the driving device 200, and the moving body 300 can be manufactured at low cost while improving their characteristics.

<2. rotor>
Next, details of the rotor 10 will be described.

(2-1. First Embodiment)
FIG. 3 is a side view schematically showing the configuration of the rotor 10 according to the first embodiment of the present disclosure. As shown in FIG. 3, the rotor 10 has a first rotor core 11 and a second rotor core 12 arranged in the axial direction. In this embodiment, the first rotor core 11 and the second rotor core 12 are arranged vertically, with the first rotor core 11 on the top and the second rotor core 12 on the bottom. In this embodiment, the number of rotor cores forming the rotor 10 is two. However, the number of rotor cores forming the rotor 10 may be any number greater than two.

Both the first rotor core 11 and the second rotor core 12 are cylindrical with the central axis A as the center. The first rotor core 11 and the second rotor core 12 have the same inner diameter and outer diameter. Also, the first rotor core 11 and the second rotor core 12 have the same length in the axial direction. The first rotor core 11 and the second rotor core 12 are, for example, laminated steel plates in which a plurality of magnetic steel plates are laminated in the axial direction. A plurality of electromagnetic steel sheets are fixed to each other by caulking or welding, for example.

The first rotor core 11 and the second rotor core 12 have a plurality of magnetic poles in the circumferential direction. First rotor core 11 and second rotor core 12 have the same number of magnetic poles. In FIG. 3, a thick line TL indicates the center position of each magnetic pole in the circumferential direction. As shown in FIG. 3, the first rotor core 11 and the second rotor core 12 are arranged such that their magnetic pole positions are shifted from each other in the circumferential direction. That is, the rotor 10 has a skew structure. Cogging torque can be reduced by configuring the rotor 10 to have a skew structure in this way. In this embodiment, the first rotor core 11 is displaced to one side in the circumferential direction with respect to the second rotor core 12 . However, the first rotor core 11 may be displaced from the second rotor core 12 to the other side in the circumferential direction. The angle at which the first rotor core 11 and the second rotor core 12 are displaced in the circumferential direction may be an arbitrary value obtained by, for example, experiments or simulations.

FIG. 4 is a plan view showing a schematic configuration of the first rotor core 11 included in the rotor 10 according to the first embodiment. In the present embodiment, the second rotor core 12 has the same configuration as the first rotor core 11 except for the configuration in which the positions of the magnetic poles are shifted in the circumferential direction. For this reason, the configuration of the second rotor core 12 may also be collectively described with reference to FIG. 4 showing the configuration of the first rotor core 11 . In this embodiment, since the first rotor core 11 and the second rotor core 12 can be manufactured using the same mold, it is possible to manufacture the first rotor core and the second rotor core using different molds. manufacturing cost can be suppressed.

As shown in FIG. 4, each of the first rotor core 11 and the second rotor core 12 has a pair of first magnets 13a, 13b and a pair of first magnet housing holes 14a, 14b.

In this embodiment, in each of the first rotor core 11 and the second rotor core 12, eight pairs of first magnets 13a and 13b are arranged at regular intervals in the circumferential direction. A pair of first magnets 13a and 13b constitute magnetic poles. That is, each of the first rotor core 11 and the second rotor core 12 has eight magnetic poles. However, the number of magnetic poles may be other than eight, and the number of magnetic poles may be changed according to the intended design of the rotating electric machine 100, for example.

The pair of first magnets 13a and 13b are arranged in a V-shape in which the interval in the circumferential direction widens toward the radially outward direction. Specifically, each of the pair of first magnets 13a and 13b has a rectangular parallelepiped shape in plan view from the axial direction. In plan view from the axial direction, the longitudinal directions of the pair of first magnets 13a and 13b are inclined in opposite directions with respect to the radial direction. The pair of first magnets 13a and 13b have the same shape and size, and are arranged symmetrically with respect to a virtual line extending radially from the central axis A in plan view from the axial direction. The pair of first magnets 13a and 13b are permanent magnets having the same magnetic properties, such as sintered magnets or bonded magnets.

The pair of first magnet accommodation holes 14a, 14b accommodates the pair of first magnets 13a, 13b. Therefore, in the present embodiment, each of the first rotor core 11 and the second rotor core 12 has eight pairs of first magnet housing holes 14a and 14b. The number of the pair of first magnet housing holes 14a, 14b may be changed according to the number of the pair of first magnets 13a, 13b. The plurality of pairs of first magnet housing holes 14a, 14b are arranged at regular intervals in the circumferential direction.

Similar to the pair of first magnets 13a and 13b, the pair of first magnet housing holes 14a and 14b are V-shaped so that the interval in the circumferential direction increases toward the radially outward direction. The pair of first magnet housing holes 14a and 14b are arranged symmetrically with respect to a virtual line extending radially from the central axis A in plan view from the axial direction. The pair of first magnet housing holes 14a and 14b are through holes that axially penetrate the rotor cores 11 and 12 in which the housing holes 14a and 14b are provided.

In the present embodiment, each of the pair of first magnet accommodation holes 14a and 14b has two longitudinal ends of the first magnets 13a and 13b accommodated in the accommodation holes 14a and 14b in plan view from the axial direction. has a first gap 15 in the . The first gap 15 functions as a flux barrier.

FIG. 5 is a plan view schematically showing the detailed configuration of the first rotor core 11 shown in FIG. 4. As shown in FIG. FIG. 5 is an enlarged view of a portion of the first rotor core 11. As shown in FIG. As shown in FIG. 5, the first rotor core 11 further has a plurality of flux barriers 30 penetrating in the axial direction. The flux barrier 30 is a through hole provided separately from the first magnet housing hole 14 . Specifically, the multiple flux barriers 30 have a first flux barrier 31 and a second flux barrier 32 .

In this embodiment, the multiple flux barriers 30 include only two types of flux barriers, the first flux barrier 31 and the second flux barrier 32 . In this embodiment, the first flux barrier 31 and the second flux barrier 32 are different in shape and size from each other. However, the first flux barrier 31 and the second flux barrier 32 may have the same shape and size. The shape of the flux barrier 30 is not particularly limited.

FIG. 6 is a diagram showing the relationship between the first rotor core 11 shown in FIG. 5 and the second rotor core 12 arranged below the first rotor core 11. As shown in FIG. In FIG. 6, the configuration related to the second rotor core 12 is indicated by broken lines. As shown in FIG. 6 , the first flux barrier 31 and the second flux barrier 32 at least partially overlap the first magnet housing holes 14 of the second rotor core 12 in the axial direction.

Specifically, the first flux barrier 31 axially overlaps at least a portion of the first magnet accommodation hole 14a on one side of the pair of first magnet accommodation holes 14a and 14b of the second rotor core 12 in the circumferential direction. . The second flux barrier 32 axially overlaps at least a portion of the first magnet accommodation hole 14b on the other side of the pair of first magnet accommodation holes 14a and 14b of the second rotor core 12 in the circumferential direction.

In FIG. 6 , the black dots indicate injection positions of the resin 16 . FIG. 7 is a plan view schematically showing a configuration of part of first rotor core 11 after injection of resin 16. As shown in FIG. In the present embodiment, resin 16 is similarly injected at each magnetic pole of the rotor 10 in which the first rotor core 11 and the second rotor core 12 are superimposed. In each magnetic pole of the first rotor core 11 , the resin 16 is injected into each of the pair of first magnet housing holes 14 a and 14 b , the first flux barrier 31 and the second flux barrier 32 . At least a part of the first flux barrier 31 and the second flux barrier 32 overlaps the first magnet housing hole 14 of the second rotor core 12 in the axial direction. For this reason, by injecting the resin 16 from the first rotor core 11 side, the resin 16 is filled not only in the first magnet accommodation holes 14 of the first rotor core 11 but also in the first magnet accommodation holes 14 of the second rotor core 12 . be able to.

That is, the rotor 10 of this embodiment further has the resin 16 that fills the first magnet housing holes 14 and the flux barriers 30 . Specifically, the rotor 10 has a resin 16 that fills the first magnet housing holes 14 , the first flux barriers 31 and the second flux barriers 32 . The resin 16 is, for example, an epoxy resin or the like.

With such a configuration, the first magnets 13 can be fixed in the first magnet housing holes 14 using the resin 16 in each of the rotor cores 11 and 12 constituting the rotor 10 . Since the first rotor core 11 and the second rotor core 12 can be axially overlapped and the first magnets 13 in the respective rotor cores 11 and 12 can be collectively fixed by the resin 16, the rotor 10 can be manufactured with Work efficiency can be improved.

It is preferable that the first flux barrier 31 and the second flux barrier 32 overlap the first magnet housing hole 14 as much as possible. Thereby, the efficiency of filling the resin 16 can be improved. More specifically, the resin 16 is melted at the time of injection, and the first magnets 13 are fixed to the rotor cores 11 and 12 by solidifying the melted resin 16 in the first magnet housing holes 14 . Also, the resin 16 may cover the upper end surface of the first magnet 13 in the first magnet housing hole 14 . In the second rotor core 12 , the lower ends of the first magnets 13 accommodated in the first magnet accommodation holes 14 of the second rotor core 12 may not be covered with the resin 16 . On the lower side of the second rotor core 12 , the lower end of the first magnet 13 may be arranged on the same plane as the opening edge of the first magnet housing hole 14 of the second rotor core 12 .

As shown in FIG. 5, in plan view from the axial direction, a virtual line connecting the center axis A and the intermediate position in the circumferential direction of the pair of first magnets 13a and 13b is defined as a first axis J1. A virtual line adjacent to the first axis J1 in the circumferential direction, magnetically perpendicular to the first axis J1, and passing through the central axis A is defined as a second axis J2 in plan view from the axial direction. In other words, the second axis J2 is an imaginary line that connects the center axis A and the intermediate position in the circumferential direction between the first axes J1 that are adjacent in the circumferential direction. Note that the first axis J1 is a so-called d-axis. The second axis J2 is a so-called q-axis.

As shown in FIG. 5, the first flux barrier 31 is arranged between the first axis J1 and the first magnet 13 in the circumferential direction. In other words, the first flux barrier 31 is arranged between the first axis J1 and the first magnet housing hole 14 in the circumferential direction. In this embodiment, the first flux barrier 31 is arranged between the first axis J1 and the first magnet 13a on one side of the pair of first magnets 13a and 13b in the circumferential direction.

However, if the direction in which the second rotor core 12 is displaced in the circumferential direction with respect to the first rotor core 11 is the opposite direction to that of the present embodiment, the first flux barrier 31 has the first axis J1 and the pair of first It may be arranged between the first magnet 13b on the other side in the circumferential direction of the one magnets 13a and 13b in the circumferential direction. Further, another flux barrier may be provided at a position symmetrical to the first flux barrier 31 with respect to the first axis J1 of the first rotor core 11 . With this configuration, it is possible to prevent the first rotor core 11 from being out of balance, and the rotor 10 can be stably rotated.

Further, as shown in FIG. 5, the second flux barrier 32 is arranged on the second axis J2. By arranging the first flux barrier 31 and the second flux barrier 32 in consideration of the positional relationship between the first axis J1 and the second axis J2 in this manner, a plurality of flux barriers are arranged at positions capable of reducing torque ripple. 30 can be placed. That is, in the rotor 10 having the skew structure, it is possible to reduce torque ripple and improve manufacturing efficiency.

FIG. 8 is a diagram for explaining the details of the arrangement of the first flux barrier 31 and the second flux barrier 32. As shown in FIG. FIG. 8 is an enlarged plan view of the first rotor core 11 similar to FIG. As shown in FIG. 8, in plan view from the axial direction, a virtual circle having a radius extending from the central axis A to the radially outermost end of the first magnet housing hole 14 is defined as a first virtual circle VC1. A virtual circle having a radius from A to the radially outermost end of the first magnet 13 is defined as a second virtual circle VC2. As shown in FIG. 8, the second flux barrier 32 is arranged radially between the first virtual circle VC1 and the second virtual circle VC2.

Moreover, as shown in FIG. 6, the first flux barrier 31 and the second flux barrier 32 are arranged at symmetrical positions with respect to the first axis J1 of the second rotor core 12 . That is, the first flux barrier 31 is also arranged radially between the first virtual circle VC1 and the second virtual circle VC2.

By arranging the first flux barrier 31 and the second flux barrier 32 in this way, in a configuration in which the second rotor core 12 is arranged with the magnetic pole positions shifted in the circumferential direction with respect to the first rotor core 11 , the first rotor core 11 By using the first flux barrier 31 and the second flux barrier 32 provided, the resin 16 can be efficiently filled into the first magnet housing holes 14 of the second rotor core 12 . Further, the first flux barrier 31 and the second flux barrier 32 that enable efficient injection of the resin 16 into the first magnet housing holes 14 of the plurality of rotor cores 11 and 12 are used to reduce torque ripple. can be placed in a suitable position.

FIG. 9 is a graph showing experimental results for explaining the placement of the second flux barrier 32. In FIG. In FIG. 9, the horizontal axis X1 indicates the distance from the outer peripheral surface of the first rotor core 11 to the second flux barrier 32 arranged on the second axis J2. However, the distance is shown as a percentage of the radius of the first rotor core 11 . Also, the vertical axis Y1 is the torque ripple. However, the vertical axis Y1 indicates a normalized value assuming that the torque ripple value obtained when the second flux barrier 32 is not arranged is 1. Note that the experimental conditions used for normalization when the second flux barrier 32 was not arranged were the same as the experimental conditions when the experimental data shown in FIG. 9 were obtained, except that the second flux barrier 32 was not arranged. be.

As shown in FIG. 9, when the second flux barrier 32 is arranged at a distance of 2.9% of the radius of the first rotor core 11 from the outer peripheral surface of the first rotor core 11, the torque ripple causes the second flux barrier 32 to be arranged. It's almost the same as if you didn't. It can be estimated that if the second flux barrier 32 is arranged at a distance larger than 2.9% of the radius of the first rotor core 11 from the outer peripheral surface of the first rotor core 11, the torque ripple is reduced.

From the result of FIG. 9, it is preferable that the second flux barrier 32 be arranged at a distance of 3.5% or more of the radius of the first rotor core 11 from the outer peripheral surface of the first rotor core 11 . As a result, the flux barrier 30, which enables efficient injection of the resin 16 into the first magnet housing holes 14 of the plurality of rotor cores 11 and 12, is arranged at an appropriate position, thereby reducing torque ripple. can be done.

In addition, it is preferable that the plurality of flux barriers 30 are arranged on the same circumference around the central axis A. As shown in FIG. With this configuration, since the plurality of flux barriers 30 are provided at positions where the distances in the radial direction from the central axis A are the same, it is possible to prevent the rotor 10 from being out of balance. It can rotate stably.

(2-2. Second embodiment)
Next, the rotor 10A of 2nd Embodiment is demonstrated. In the description of the rotor 10A of the second embodiment, the description of the configuration and contents that overlap with those of the first embodiment will be omitted if there is no particular need for description.

A rotor 10A of this embodiment also has a first rotor core 11A and a second rotor core 12A having a skew structure, similarly to the first embodiment. FIG. 10 is a plan view showing the configuration of the first rotor core 11A included in the rotor 10A according to the second embodiment. FIG. 10 is an enlarged view of part of the first rotor core 11A. FIG. 11 is a diagram showing the relationship between the first rotor core 11A shown in FIG. 10 and the second rotor core 12A arranged below the first rotor core 11A. In FIG. 11, the configuration related to the second rotor core 12A is indicated by dashed lines.

As shown in FIGS. 10 and 11, also in the present embodiment, the first rotor core 11A and the second rotor core 12A each include a pair of first magnets 13aA and 13bA and a pair of first magnet housing holes 14aA and 14bA. and However, in the present embodiment, each of the first rotor core 11A and the second rotor core 12A further has a pair of second magnets 17a, 17b and a pair of second magnet housing holes 18a, 18b. This point is different from the first embodiment.

The pair of second magnets 17a and 17b are arranged in a V shape radially outwardly and circumferentially between the pair of first magnets 13aA and 13bA. Specifically, the V-shape is a V-shape in which the circumferential interval increases toward the radially outward direction. Each of the pair of second magnets 17a and 17b has a rectangular parallelepiped shape in plan view from the axial direction. In plan view from the axial direction, the longitudinal directions of the pair of second magnets 17a and 17b are inclined in opposite directions with respect to the radial direction. The pair of second magnets 17a and 17b have the same shape and size, and are arranged symmetrically with respect to the first axis J1 of the first rotor core 11A in plan view from the axial direction.

The pair of second magnets 17a and 17b are permanent magnets having the same magnetic properties, such as sintered magnets or bonded magnets. The pair of second magnets 17a and 17b constitute magnetic poles together with the pair of first magnets 13aA and 13bA. In each of the first rotor core 11A and the second rotor core 12A, eight magnetic poles are formed by the pair of first magnets 13aA and 13bA and the pair of second magnets 17a and 17b.

The pair of second magnet accommodation holes 18a, 18b accommodates the pair of second magnets 17a, 17b. Therefore, in the present embodiment as well, the number of pairs of second magnet housing holes 18a and 18b is eight in each of the first rotor core 11A and the second rotor core 12A. The plurality of pairs of second magnet housing holes 18a, 18b are arranged at regular intervals in the circumferential direction.

Like the pair of second magnets 17a and 17b, the pair of second magnet housing holes 18a and 18b are V-shaped, with the circumferential interval increasing radially outward. The pair of second magnet housing holes 18a and 18b are arranged symmetrically with respect to the first axis J1 of the first rotor core 11A in plan view from the axial direction. The pair of second magnet housing holes 18a and 18b are through holes that axially penetrate the rotor cores 11A and 12A in which the housing holes 18a and 18b are provided.

In the present embodiment, each of the pair of second magnet accommodation holes 18a and 18b has two longitudinal ends of the second magnets 17a and 17b accommodated in the accommodation holes 18a and 18b in plan view from the axial direction. has a second gap 19 in the . The second gap 19 functions as a flux barrier.

Also in this embodiment, the first rotor core 11A has a plurality of flux barriers 30A as in the first embodiment. The flux barrier 30A is a through hole provided separately from the first magnet accommodation hole 14 and the second magnet accommodation hole 18 . The multiple flux barriers 30A have a first flux barrier 31A and a second flux barrier 32A. However, in this embodiment, the multiple flux barriers 30</b>A further have a third flux barrier 33 and a fourth flux barrier 34 . This point is different from the first embodiment. The shape and size of the third flux barrier 33 and the fourth flux barrier 34 are also not particularly limited.

As shown in FIG. 11, in the present embodiment, as in the first embodiment, the first flux barrier 31A and the second flux barrier 32A are arranged at least one axial distance from the first magnet accommodating hole 14A of the second rotor core 12A. parts overlap. Specifically, the first flux barrier 31A axially overlaps at least a portion of the first magnet accommodation hole 14aA on one side of the pair of first magnet accommodation holes 14aA and 14bA of the second rotor core 12A in the circumferential direction. . The second flux barrier 32A axially overlaps at least a portion of the first magnet accommodation hole 14bA on the other circumferential side of the pair of first magnet accommodation holes 14aA and 14bA of the second rotor core 12A.

Furthermore, in the present embodiment, the third flux barrier 33 and the fourth flux barrier 34 at least partially overlap the second magnet housing holes 18 of the second rotor core 12A in the axial direction. Specifically, the third flux barrier 33 axially overlaps at least a portion of the second magnet accommodation hole 18b on the other side of the pair of second magnet accommodation holes 18a and 18b of the second rotor core 12 in the circumferential direction. . At least a portion of the fourth flux barrier 34 axially overlaps with the second magnet accommodation hole 18a on one side of the pair of second magnet accommodation holes 18a and 18b of the second rotor core 12 in the circumferential direction.

In FIG. 11, black dots indicate injection positions of the resin 16A. FIG. 12 is a plan view schematically showing the configuration of part of the first rotor core 11A after injection of the resin 16A. In the present embodiment, resin 16 is similarly injected at each magnetic pole of the rotor 10A in which the first rotor core 11A and the second rotor core 12A are overlapped. In each magnetic pole of the first rotor core 11A, each of the pair of first magnet housing holes 14aA and 14bA, each of the pair of second magnet housing holes 18a and 18b, the first flux barrier 31A, and the second flux barrier 32A. , the third flux barrier 33 and the fourth flux barrier 34 are injected with the resin 16A. At least a part of the first flux barrier 31A and the second flux barrier 32A overlaps the first magnet housing hole 14A of the second rotor core 12A in the axial direction, and the third flux barrier 33 and the fourth flux barrier 34 overlap each other in the axial direction. At least a part of it overlaps with the second magnet housing hole 18 of the two-rotor core 12A in the axial direction. Therefore, by injecting resin 16A from the first rotor core 11A side, not only the first magnet housing hole 14A and the second magnet housing hole 18 of the first rotor core 11A but also the first magnet housing hole 14A of the second rotor core 12A are filled. And the second magnet housing hole 18 can also be filled with the resin 16A.

That is, the rotor 10A of the present embodiment further has resin 16A that fills the first magnet housing hole 14A, the second magnet housing hole 18, and the flux barrier 30A. Specifically, in the rotor 10A, the first magnet housing hole 14A, the second magnet housing hole 18, the first flux barrier 31A, the second flux barrier 32A, the third flux barrier 33, and the fourth flux barrier 34 are filled. It has a resin 16A. The resin 16A is, for example, an epoxy resin or the like.

With this configuration, in each of the rotor cores 11A and 12A constituting the rotor 10A, the resin 16A is used to insert the first magnet 13A into the first magnet accommodation hole 14A and the second magnet 17 into the second magnet accommodation hole. 18 can be fixed. Since the first rotor core 11A and the second rotor core 12A can be axially overlapped and the first magnets 13A and the second magnets 17 in the respective rotor cores 11A and 12A can be collectively fixed by the resin 16A, the rotor It is possible to improve work efficiency during manufacturing of 10A. Also, the resin 16A may cover the upper end surface of the first magnet 13A in the first magnet housing hole 14A. In the second rotor core 12A, the lower end of the first magnet 13A housed in the first magnet housing hole 14A of the second rotor core 12A does not have to be covered with the resin 16A. On the lower side of the second rotor core 12A, the lower end of the first magnet 13A may be arranged on the same plane as the lower opening edge of the first magnet housing hole 14A of the second rotor core 12A. The resin 16</b>A may cover the upper end face of the second magnet 17 in the second magnet housing hole 18 . The lower end of the second magnet 17 housed in the second magnet housing hole 18 of the second rotor core 12A does not have to be covered with the resin 16A. On the lower side of the second rotor core 12A, the lower end of the second magnet 17 may be flush with the lower opening edge of the second magnet housing hole 18 of the second rotor core 12A.

As shown in FIG. 10, the first flux barrier 31A includes a pair of first magnets 13aA and 13bA on one side in the circumferential direction, and a pair of second magnets 17a and 17b on one side in the circumferential direction. It is arranged between the second magnets 17a in the circumferential direction. In other words, the first flux barrier 31A is formed in one of the pair of first magnet accommodation holes 14aA and 14bA in the circumferential direction and one of the pair of second magnet accommodation holes 18a and 18b in the circumferential direction. It is arranged between the second magnet accommodating hole 18a on the side in the circumferential direction.

The second flux barrier 32A is arranged on the second axis J2 as in the first embodiment. Also, the first flux barrier 31A and the second flux barrier 32A are arranged at symmetrical positions with respect to the first axis J1 of the second rotor core 12A, as in the first embodiment. Also, the first flux barrier 31A and the second flux barrier 32A are arranged between the first virtual circle VC1 and the second virtual circle VC2 in the circumferential direction as in the first embodiment.

The third flux barrier 33 is provided around the pair of first magnets 13aA and 13bA on the other side in the circumferential direction, and the second magnet 17b on the other side in the circumferential direction of the pair of second magnets 17a and 17b. placed between directions. In other words, the third flux barrier 33 is provided in the first magnet accommodation hole 14bA on the other side in the circumferential direction of the pair of first magnet accommodation holes 14aA and 14bA and in the other side in the circumferential direction of the pair of second magnet accommodation holes 18a and 18b. It is arranged between the second magnet accommodating hole 18b on the side in the circumferential direction.

The fourth flux barrier 34 is arranged circumferentially between the first axis J1 of the first rotor core 11A and the second magnet 17a on one side of the pair of second magnets 17a and 17b in the circumferential direction. In other words, the fourth flux barrier 34 is located between the first axis J1 of the first rotor core 11A and the second magnet accommodation hole 18a on one side of the pair of second magnet accommodation holes 18a and 18b in the circumferential direction. placed.

Considering the positional relationship between the first axis J1 and the second axis J2 and the positional relationship between the first magnet 13A and the second magnet 17, the first flux barrier 31A, the second flux barrier 32A, the second flux barrier 32A, and the second flux barrier 32A are arranged in this way. By arranging the 3rd flux barrier 33 and the 4th flux barrier, it is possible to arrange a plurality of flux barriers 30A at positions where torque ripple can be reduced. That is, in the rotor 10A having the skew structure, it is possible to reduce torque ripple and improve manufacturing efficiency. In addition, when the direction in which the second rotor core 12A is shifted in the circumferential direction with respect to the first rotor core 11A is opposite to that in the present embodiment, the positional relationship in the circumferential direction in which various flux barriers are provided may be changed in the circumferential direction. The one side and the other side of the above description may be reversed as appropriate.

FIG. 13 is a diagram for explaining the details of the arrangement of the plurality of flux barriers 30A included in the first rotor core 11A of the second embodiment. FIG. 13 is an enlarged plan view of the first rotor core 11A similar to FIG. As shown in FIG. 13, in plan view from the axial direction, a virtual circle having a radius extending from the central axis A to the radially outermost end of the second magnet housing hole 18 is defined as a third virtual circle VC3. A virtual circle having a radius from A to the radially outermost end of the second magnet 17 is defined as a fourth virtual circle VC4.

In this case, at least one of the third flux barrier 33 and the fourth flux barrier 34 is preferably arranged radially between the third virtual circle VC3 and the fourth virtual circle VC4. According to this configuration, the third flux barrier 33 and the fourth flux barrier 34 that enable efficient injection of the resin 16A into the second magnet housing holes 18 of the plurality of rotor cores 11A and 12A are placed at appropriate positions. , the torque ripple can be reduced. In this embodiment, as a more preferable form, both the third flux barrier 33 and the fourth flux barrier 34 are arranged radially between the third virtual circle VC3 and the fourth virtual circle VC4.

As shown in FIG. 11, in this embodiment, the third flux barrier 33 and the fourth flux barrier 34 are arranged at symmetrical positions with respect to the first axis J1 of the second rotor core 12A. When the third flux barrier 33 and the fourth flux barrier 34 are arranged in this way, in a configuration in which the second rotor core 12A is arranged with the magnetic pole positions shifted in the circumferential direction with respect to the first rotor core 11A, the first rotor core 11A Using the third flux barrier 33 and the fourth flux barrier 34 provided, the resin 16A can be efficiently filled into the second magnet housing holes 18 of the second rotor core 12 . Further, the third flux barrier 33 and the fourth flux barrier 34, which enable efficient injection of the resin 16A into the second magnet housing holes 18 of the plurality of rotor cores 11A, 12A, are used to reduce torque ripple. can be placed in a suitable position.

FIG. 14 is a graph showing experimental results for explaining the arrangement of the third flux barrier 33. In FIG. In FIG. 14, the horizontal axis X2 indicates the distance of the third flux barrier 33 from the outer peripheral surface of the first rotor core 11A. However, the distance is shown as a percentage of the radius of the first rotor core 11A. Also, the vertical axis Y2 is the torque ripple. However, the vertical axis Y2 indicates a normalized value assuming that the torque ripple value obtained when the third flux barrier 33 is not arranged is 1. Note that the experimental conditions used for normalization when the third flux barrier 33 was not arranged were the same as the experimental conditions when the experimental data shown in FIG. 14 were obtained, except that the third flux barrier 33 was not arranged. be. Further, when the third flux barriers 33 are arranged, the positions of the third flux barriers 33 in the circumferential direction are the same.

As shown in FIG. 14, the third flux barrier 33 tends to be able to reduce torque ripple when it is closer to the outer peripheral surface of the first rotor core 11A. However, the closer the third flux barrier 33 is to the outer peripheral surface of the first rotor core 11A, the more difficult it becomes in manufacturing to dispose the third flux barrier 33 on the first rotor core 11A. For this reason, it is preferable to dispose the third flux barrier 33 at a position slightly shifted radially inward from the outer peripheral surface of the first rotor core 11A. Further, when the third flux barrier 33 is arranged at a distance of 7.3% of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A, the torque ripple is different from the case where the third flux barrier 33 is not arranged. will hardly change.

From the above, the third flux barrier 33 is preferably arranged at a distance of 1.9% or more and 6.2% or less of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A. Thereby, the third flux barrier 33 can be arranged at an appropriate position to reduce torque ripple.

Like the third flux barrier 33, the first flux barrier 31A is arranged between the pair of first magnets 13aA and 13bA and the pair of second magnets 17a and 17b in the circumferential direction. For this reason, it is preferable that the distance of the first flux barrier 31A from the outer peripheral surface of the first rotor core 11A be the same as that of the third flux barrier 33. As shown in FIG. That is, the first flux barrier 31A is also preferably arranged at a distance of 1.9% or more and 6.2% or less of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A. Thereby, the first flux barrier 31A can be arranged at an appropriate position to reduce torque ripple.

In this embodiment, as a preferred form, the first flux barrier 31A and the third flux barrier 33 are arranged at symmetrical positions with respect to the first axis J1 of the first rotor core 11A in plan view from the axial direction. be. With such a configuration, the first rotor core 11A can be prevented from being out of balance, and the rotor 10A can be stably rotated.

FIG. 15 is a first graph showing experimental results for explaining the arrangement of the fourth flux barrier 34. FIG. In FIG. 15, the horizontal axis X3 represents the angle of the fourth flux barrier 34 with respect to the first axis J1 of the first rotor core 11A. Also, the vertical axis Y3 is the torque ripple. However, the vertical axis Y3 indicates a normalized value assuming that the torque ripple value obtained when the fourth flux barrier 34 is not arranged is 1. Note that the experimental conditions used for normalization when the fourth flux barrier 34 was not arranged were the same as the experimental conditions when the experimental data shown in FIG. 15 were obtained, except that the fourth flux barrier 34 was not arranged. be. Further, when the fourth flux barriers 34 are arranged, the radial positions of the fourth flux barriers 33 are the same.

As shown in FIG. 15, if the angle of the fourth flux barrier 34 with respect to the first axis J1 is too small, torque ripple tends to increase. If the angle of the fourth flux barrier 34 with respect to the first axis J1 is less than 1.5°, the torque ripple may increase compared to when the fourth flux barrier 34 is not arranged. Further, when the angle of the fourth flux barrier 34 with respect to the first axis J1 becomes too large, the torque ripple tends to increase. When the angle of the fourth flux barrier 34 with respect to the first axis J1 is 5.5°, the torque ripple is higher than when the fourth flux barrier 34 is not arranged.

FIG. 16 is a second graph showing experimental results for explaining the placement of the fourth flux barrier 34 . In FIG. 16, the horizontal axis X4 indicates the distance of the fourth flux barrier 34 from the outer peripheral surface of the first rotor core 11A. However, the distance is shown as a percentage of the radius of the first rotor core 11A. A vertical axis Y4 is a torque ripple. However, the vertical axis Y4 indicates a normalized value assuming that the torque ripple value obtained when the fourth flux barrier 34 is not arranged is 1. Note that the experimental conditions used for normalization when the fourth flux barrier 34 was not arranged were the same as the experimental conditions when the experimental data shown in FIG. 16 were obtained, except that the fourth flux barrier 34 was not arranged. be. Further, when the fourth flux barriers 34 are arranged, the positions of the fourth flux barriers 34 in the circumferential direction are the same.

As shown in FIG. 16, the fourth flux barrier 34 tends to be able to reduce torque ripple when it is closer to the outer peripheral surface of the first rotor core 11A. However, similarly to the case of the third flux barrier 33, the closer the fourth flux barrier 34 is to the outer peripheral surface of the first rotor core 11A, the more difficult it is to arrange on the first rotor core 11A. For this reason, it is preferable to dispose the fourth flux barrier 34 at a position slightly displaced radially inward from the outer peripheral surface of the first rotor core 11A. Further, when the fourth flux barrier 34 is arranged at a distance exceeding 5.2% of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A, the torque ripple arranges the fourth flux barrier 34. It is estimated that there will be almost no difference from the case without

As described above, the fourth flux barrier 34 is positioned within a range of 1.5° or more and 5° or less from the first axis J1 of the first rotor core 11A and 1.5° of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A. It is preferable that they are arranged at a distance of 9% or more and 4.5% or less. Thereby, the fourth flux barrier 34 can be arranged at an appropriate position to reduce torque ripple.

In this embodiment, as a preferred form, the plurality of flux barriers 30A are arranged at positions symmetrical to the fourth flux barriers 34 with respect to the first axis J1 of the first rotor core 11A in plan view from the axial direction. It further has a fifth flux barrier 35 (see, for example, FIG. 10). With such a configuration, the first rotor core 11A can be prevented from being out of balance, and the rotor 10A can be stably rotated. Since it is provided for the purpose of adjusting the balance of the first rotor core 11A, as shown in FIG. 12, the fifth flux barrier 35 is also preferably filled with the resin 16A.

It should be noted that the fifth flux barrier 35 does not have to be arranged symmetrically with the fourth flux barrier 34 . The fifth flux barrier 35 is located on the opposite side in the circumferential direction of the first rotor core 11A from the first axis J1 to the side where the fourth flux barrier 34 is provided. It may be arranged between the directions. In this case, the fifth flux barrier 35 is positioned within a range of 1.5° or more and 5° or less from the first axis J1 of the first rotor core 11A and 1.5° or more of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A. It is preferable that they are arranged at a distance of 9% or more and 4.5% or less. Thereby, the fifth flux barrier 35 can be arranged at an appropriate position to reduce torque ripple.

Also in this embodiment, it is preferable that the plurality of flux barriers 30 be arranged on the same circumference around the central axis A, as in the case of the first embodiment. With this configuration, since the plurality of flux barriers 30A are provided at positions having the same radial distance from the central axis A, it is possible to prevent the rotor 10A from being out of balance. It can rotate stably.

FIG. 17 is a diagram for explaining the second rotor core 12A included in the rotor 10A of the second embodiment. FIG. 17 is a diagram showing the configuration of the second rotor core 12A in FIG. 11 in more detail. As shown in FIG. 17, the second rotor core 12A may also have a flux barrier 30A extending axially therethrough.

In this embodiment, the second rotor core 12A has an unfilled flux barrier 36 which penetrates in the axial direction, is covered with the first rotor core 11A, and is unfilled with the resin 16A. By allowing such a configuration, the second rotor core 12A can have the same shape as the first rotor core 11A. That is, the first rotor core 11A and the second rotor core 12A can be manufactured with the same mold, and the manufacturing cost can be reduced. In this embodiment, the second rotor core 12A has the same configuration as the first rotor core 11A, except for the configuration in which the positions of the magnetic poles are shifted in the circumferential direction.

<3. Notes>
Various modifications can be made to the various technical features disclosed in this specification without departing from the gist of the technical creation. In addition, the multiple embodiments and modifications shown in this specification may be implemented in combination to the extent possible.

The technology of the present disclosure can be used, for example, in home appliances, automobiles, ships, aircraft, trains, power-assisted bicycles, wind power generators, and the like.

Reference Signs List 10, 10A Rotors 11, 11A First rotor cores 12, 12A Second rotor cores 13, 13A First magnets 14, 14A First magnet accommodating holes 16, 16A... Resin 17 Second magnet 18 Second magnet housing hole 20 Stator 30, 30A Flux barrier 31, 31A First flux barrier 32, 32A Second flux Barrier 33 Third flux barrier 34 Fourth flux barrier 35 Fifth flux barrier 36 Unfilled flux barrier 100 Rotary electric machine 200 Driving device 201 Gear Unit 300... Moving body 301... Moving motion unit A... Central axis J1... First axis J2... Second axis VC1... First virtual circle VC2... Second virtual circle VC3: Third virtual circle VC4: Fourth virtual circle

Claims (17)

A rotor that rotates about a central axis,
having a first rotor core and a second rotor core arranged in the axial direction and having magnetic pole positions shifted from each other in the circumferential direction;
Each of the first rotor core and the second rotor core,
a pair of first magnets that are arranged in a V shape with a circumferential interval that increases radially outward and that constitute the magnetic poles;
a pair of first magnet housing holes for housing the pair of first magnets;
has
The first rotor core further has a plurality of flux barriers penetrating in the axial direction,
The plurality of flux barriers have a first flux barrier and a second flux barrier that at least partially overlap with the first magnet housing hole of the second rotor core in the axial direction,
In a plan view from the axial direction,
An imaginary line connecting the intermediate position in the circumferential direction of the pair of first magnets and the central axis is defined as a first axis,
An imaginary line adjacent to the first axis in the circumferential direction, magnetically perpendicular to the first axis, and passing through the central axis is defined as a second axis;
The first flux barrier is arranged between the first shaft and the first magnet in the circumferential direction,
The rotor, wherein the second flux barrier is arranged on the second axis. In a plan view from the axial direction,
A virtual circle having a radius from the central axis to a radially outermost end of the first magnet housing hole is defined as a first virtual circle,
A virtual circle having a radius from the central axis to the radially outermost end of the first magnet is defined as a second virtual circle,
the second flux barrier is arranged radially between the first virtual circle and the second virtual circle;
2. The rotor according to claim 1, wherein said first flux barrier and said second flux barrier are arranged at symmetrical positions with respect to said first axis of said second rotor core. 3. The rotor according to claim 1, wherein said second flux barrier is arranged at a distance of 3.5% or more of the radius of said first rotor core from the outer peripheral surface of said first rotor core. Each of the first rotor core and the second rotor core,
a pair of second magnets arranged in the V shape radially outwardly and circumferentially between the pair of first magnets and forming the magnetic poles together with the pair of first magnets;
a pair of second magnet housing holes for housing the pair of second magnets;
further having
The plurality of flux barriers further include a third flux barrier and a fourth flux barrier at least partially overlapping the second magnet housing hole of the second rotor core in the axial direction,
The first flux barrier is disposed between the first magnet on one side in the circumferential direction of the pair of first magnets and the second magnet on the one side in the circumferential direction of the pair of second magnets,
The third flux barrier is disposed between the first magnet on the other side in the circumferential direction of the pair of first magnets and the second magnet on the other side in the circumferential direction of the pair of second magnets,
The fourth flux barrier is arranged between the first axis of the first rotor core and the second magnet on one side in the circumferential direction of the pair of second magnets in the circumferential direction. 4. The rotor according to any one of 3. In a plan view from the axial direction,
A virtual circle having a radius from the central axis to a radially outermost end of the second magnet housing hole is defined as a third virtual circle,
A virtual circle having a radius from the central axis to the radially outermost end of the second magnet is defined as a fourth virtual circle,
5. The rotor according to claim 4, wherein at least one of the third flux barrier and the fourth flux barrier is arranged radially between a third imaginary circle and a fourth imaginary circle. 6. The rotor according to claim 4, wherein the third flux barrier is arranged at a distance of 1.9% or more and 6.2% or less of the radius of the first rotor core from the outer peripheral surface of the first rotor core. . 7. The first flux barrier and the third flux barrier according to any one of claims 4 to 6, wherein the first flux barrier and the third flux barrier are arranged at symmetrical positions with respect to the first axis of the first rotor core in plan view from the axial direction. 2. The rotor according to item 1. The fourth flux barrier is in the range of 1.5° or more and 5° or less from the first axis of the first rotor core, and is 1.9% or more of the radius of the first rotor core from the outer peripheral surface of the first rotor core. , are spaced apart by a distance of 4.5% or less. The rotor according to any one of claims 4 to 8, wherein said third flux barrier and said fourth flux barrier are arranged at symmetrical positions with respect to said first axis of said second rotor core. 3. The plurality of flux barriers further includes a fifth flux barrier disposed at a position symmetrical to the fourth flux barrier with respect to the first axis of the first rotor core in plan view from the axial direction. 10. A rotor according to any one of 4 to 9. 4. The rotor according to any one of claims 1 to 3, further comprising a resin filling said first magnet housing hole and said flux barrier. 11. The rotor according to any one of claims 4 to 10, further comprising a resin filling said first magnet accommodation hole, said second magnet accommodation hole, and said flux barrier. 13. The rotor according to claim 11 or 12, wherein said second rotor core has an unfilled flux barrier that penetrates in the axial direction and is covered with said first rotor core and unfilled with said resin. 14. The rotor according to any one of claims 1 to 13, wherein said plurality of flux barriers are arranged on the same circle around a central axis. a rotor according to any one of claims 1 to 14;
a stator disposed radially outward of the rotor;
A rotating electric machine. a rotating electric machine according to claim 15;
a gear unit connected to the rotating electric machine;
A drive having a A driving device according to claim 16;
a moving operation unit connected to the driving device and capable of moving itself;
A moving body having

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