CN116827009A - Rotary electric machine - Google Patents

Abstract

An aspect of the rotating electrical machine of the present invention includes: a rotor rotatable about a central axis to one side in a circumferential direction; and a stator located radially outside the rotor. The rotor has: a rotor core having a plurality of magnet insertion holes; and a plurality of magnets which are respectively accommodated in the plurality of magnet insertion holes. The magnet extends in a direction perpendicular to the radial direction when viewed in the axial direction, and the rotor core has: a first magnetic flux barrier portion disposed on one side of the magnet in the circumferential direction when viewed in the axial direction; a second magnetic flux barrier portion disposed on the other side of the magnet in the circumferential direction when viewed in the axial direction; and a third magnetic flux barrier portion disposed between the second magnetic flux barrier portion and the q-axis in the circumferential direction when viewed in the axial direction. The third magnetic flux barrier portion extends from the outer periphery of the rotor core along the q-axis at least to a virtual line overlapping with the end surface on the radially inner side of the magnet when viewed in the axial direction.

Description

Rotary electric machine

Technical Field

The present invention relates to a rotating electrical machine.

Background

A rotary electric machine is known that has a rotor core and permanent magnets disposed in holes provided in the rotor core. For example, patent document 1 discloses a motor having gaps having an asymmetric shape that becomes magnetic resistance at both ends in the circumferential direction of a magnetic pole portion. In the motor disclosed in patent document 1, the clearance on the downstream side in the rotation direction of the rotor is made larger than the clearance on the upstream side in the rotation direction, whereby the rotation in one direction is optimized.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2010-252530

Disclosure of Invention

Problems to be solved by the invention

In the motor disclosed in patent document 1, in addition to large annular magnetic fluxes flowing into the respective core portions through the inside of the rotor core so as to bypass the respective gaps provided at both ends in the circumferential direction of the respective magnetic pole portions, small annular magnetic flux leakage is generated in the periphery of the edge portion of the permanent magnet on the upstream side in the rotational direction. Since magnetic flux leakage occurs, there occurs a problem such as a decrease in driving torque.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a rotary electric machine that increases driving torque.

Means for solving the problems

An aspect of the rotating electrical machine of the present invention includes: a rotor rotatable about a central axis to one side in a circumferential direction; and a stator located radially outward of the rotor, the rotor including: a rotor core having a plurality of magnet insertion holes; and a plurality of magnets housed in the plurality of magnet insertion holes, respectively, the magnets extending in a direction perpendicular to a radial direction when viewed in an axial direction, the rotor core including: a first magnetic flux barrier portion disposed on one side of the magnet in the circumferential direction when viewed in the axial direction; a second magnetic flux barrier portion disposed on the other side in the circumferential direction of the magnet when viewed in the axial direction; and a third magnetic flux barrier portion that is disposed between the second magnetic flux barrier portion and the q-axis in the circumferential direction when viewed in the axial direction, and that extends from the outer periphery of the rotor core along the q-axis to at least a virtual line overlapping with the end surface on the inner side in the radial direction of the magnet when viewed in the axial direction.

Effects of the invention

According to an aspect of the present invention, the drive torque can be increased in the rotating electrical machine.

Drawings

Fig. 1 is a cross-sectional view showing a rotary electric machine according to a first embodiment.

Fig. 2 is a partial cross-sectional view showing a part of the rotating electrical machine according to the first embodiment, and is a cross-sectional view II-II in fig. 1.

Fig. 3 is a cross-sectional view showing a magnetic pole portion of the rotor according to the first embodiment.

Fig. 4 is a graph showing the magnetic flux density when the third magnetic flux barrier portion is not provided.

Fig. 5 is a graph showing the magnetic flux density when the third magnetic flux barrier portion is provided on the other side in the circumferential direction.

Fig. 6 is a diagram showing a relationship between the circumferential dimension of the first portion in the third magnetic flux barrier portion and the torque.

Fig. 7 is a graph showing a relationship between a radial dimension of the second portion in the third magnetic flux barrier and torque.

Fig. 8 is a diagram showing a relationship between a length of the second portion of the third magnetic flux barrier extending in the circumferential direction from the first portion and torque.

Fig. 9 is a cross-sectional view showing a magnetic pole portion of a rotor according to the second embodiment.

In the figure:

1-rotating electrical machine, 10-rotor, 20-rotor core, 30-magnet insertion hole, 40-magnet, 41-virtual line, 52 a-first magnetic flux barrier portion, 52 b-second magnetic flux barrier portion, 53-third magnetic flux barrier portion, 53 a-first portion, 53 b-second portion, 60-stator, 70N, 70S-magnetic pole portion, IL 1-magnetic pole center line (d axis), IL 2-q axis.

Detailed Description

Hereinafter, a rotary electric machine according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and may be arbitrarily changed within the scope of the technical idea of the present invention. In the drawings below, the scale, the number, and the like of each structure may be different from those of the actual structure in order to facilitate understanding of each structure.

The Z-axis direction appropriately shown in each figure is a vertical direction in which the positive side is the "upper side" and the negative side is the "lower side". The central axis J shown in each figure is a virtual line extending in the vertical direction in parallel with the Z-axis direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the up-down direction is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". The arrow θ appropriately shown in each figure indicates the circumferential direction. The arrow θ is directed counterclockwise about the central axis J when viewed from above. In the following description, a side of the circumferential direction with respect to a certain object, which is a side that advances in the counterclockwise direction when viewed from the upper side, is referred to as a "circumferential direction one side", and an opposite side of the circumferential direction with respect to a certain object, which is a side that advances in the clockwise direction when viewed from the upper side, is referred to as a "circumferential direction other side".

The vertical direction, the upper side, and the lower side are only names for explaining the arrangement relation of the respective parts, and the actual arrangement relation may be an arrangement relation other than the arrangement relation represented by these names.

[ first embodiment of rotating Electrical machine ]

As shown in fig. 1, the rotary electric machine 1 is an inner rotor type rotary electric machine.

In the present embodiment, the rotary electric machine 1 is a three-phase ac rotary electric machine. The rotary electric machine 1 is, for example, a three-phase motor driven by a power supply supplied with three-phase alternating current. The rotating electrical machine 1 includes a housing 2, a rotor 10, a stator 60, a bearing holder 4, and bearings 5a and 5b.

The housing 2 accommodates therein the rotor 10, the stator 60, the bearing holder 4, and the bearings 5a and 5b. The bottom of the housing 2 holds a bearing 5b. The bearing holder 4 holds a bearing 5a. The bearings 5a, 5b are, for example, ball bearings.

The stator 60 is located radially outward of the rotor 10. The stator 60 includes a stator core 61, an insulator 64, and a plurality of coils 65. The stator core 61 has a core back 62 and a plurality of teeth 63. The core back 62 is located radially outward of the rotor core 20 described later. In fig. 2 below, the insulator 64 is not shown.

As shown in fig. 2, core back 62 is annular surrounding rotor core 20. The core back 62 is, for example, annular with the center axis J as the center.

A plurality of teeth 63 extend radially inward from the core back 62. The plurality of teeth 63 are arranged at intervals in the circumferential direction. The plurality of teeth 63 are arranged at equal intervals throughout the circumference, for example, along the circumferential direction. The teeth 63 are provided with 12, for example. That is, the number of grooves 67 of the rotary electric machine 1 is, for example, 12.

A plurality of coils 65 are mounted on the stator core 61. As shown in fig. 1, a plurality of coils 65 are mounted on the teeth 63 via, for example, insulators 64. In the present embodiment, the coils 65 are wound in a distributed manner. That is, each coil 65 is wound so as to span the plurality of teeth 63. In the present embodiment, the coil 65 is wound in full sections. That is, the circumferential pitch of the slots of the stator 60 into which the coils 65 are inserted is equal to the circumferential pitch of the magnetic poles generated when the three-phase ac power is supplied to the stator 60. The number of poles of the rotating electrical machine 1 is 8, for example. That is, the rotary electric machine 1 is, for example, an 8-pole 12-slot rotary electric machine.

The rotor 10 is rotatable about a central axis J. As shown in fig. 2, the rotor 10 includes a shaft 11, a rotor core 20, and a plurality of magnets 40. The shaft 11 is cylindrical and extends in the axial direction about the central axis J. As shown in fig. 1, the shaft 11 is supported rotatably about the central axis J by bearings 5a and 5b.

The rotor core 20 is a magnetic body. The rotor core 20 is fixed to the outer peripheral surface of the shaft 11. The rotor core 20 has a through hole 21 penetrating the rotor core 20 in the axial direction. As shown in fig. 2, the through hole 21 is circular with the central axis J as the center when viewed in the axial direction. The shaft 11 passes through the through hole 21. The shaft 11 is fixed in the through hole 21 by press fitting or the like, for example. Although not shown, the rotor core 20 is configured by stacking a plurality of electromagnetic steel plates in the axial direction, for example.

The rotor core 20 has a plurality of magnet insertion holes 30. The plurality of magnet insertion holes 30 penetrate the rotor core 20 in the axial direction, for example. A plurality of magnets 40 are inserted and accommodated in the plurality of magnet insertion holes 30. The method for fixing the magnet 40 in the magnet insertion hole 30 is not particularly limited.

The type of the plurality of magnets 40 is not particularly limited. The magnet 40 may be, for example, a neodymium magnet or a ferrite magnet. The plurality of magnets 40 constitute a pole. In the present embodiment, a plurality of magnets 40 are provided at intervals in the circumferential direction. For example, 8 magnets are provided in each of the magnet insertion holes 30 and the magnets 40.

The rotor 10 has a plurality of magnetic pole portions 70, each magnetic pole portion 70 including one magnet insertion hole 30 and one magnet 40. The number of the magnetic pole portions 70 is 8, for example. The plurality of magnetic pole portions 70 are arranged at equal intervals throughout the circumference, for example, along the circumferential direction. The plurality of magnetic pole portions 70 include a plurality of magnetic pole portions 70N of which the magnetic pole of the outer circumferential surface of the rotor core 20 is an N pole and a plurality of magnetic pole portions 70S of which the magnetic pole of the outer circumferential surface of the rotor core 20 is an S pole, respectively. For example, 4 magnetic pole portions 70N and 4 magnetic pole portions 70S are provided. The four magnetic pole portions 70N and the four magnetic pole portions 70S are alternately arranged in the circumferential direction. The structure of each magnetic pole portion 70 is the same except that the magnetic poles of the outer circumferential surface of the rotor core 20 are different and the circumferential positions are different.

The magnet insertion hole 30 extends substantially linearly in a direction perpendicular to the radial direction, for example, when viewed in the axial direction. As shown in fig. 3, the magnet insertion hole 30 extends, for example, in a direction orthogonal to the magnetic pole center line IL1 constituting the d-axis when viewed in the axial direction. The magnetic pole center line IL1 is an imaginary line extending in the radial direction through the circumferential center of the magnetic pole portion 70 and the center axis J.

When viewed in the axial direction, for example, the magnetic pole center line IL1 passes through the center of the magnet insertion hole 30 in the circumferential direction. That is, the circumferential position of the circumferential center of the magnet insertion hole 30 coincides with the circumferential position of the circumferential center of the magnetic pole portion 70, for example. The shape of the magnet insertion hole 30 as viewed in the axial direction is, for example, a line-symmetrical shape centered on the magnetic pole center line IL 1. The magnet insertion hole 30 is located at the radially outer peripheral edge portion of the rotor core 20.

The magnet insertion hole 30 has a straight portion 30a, one end portion 30b, and the other end portion 30c. The linear portion 30a extends linearly in the direction in which the magnet insertion hole 30 extends, as viewed in the axial direction. The linear portion 30a is, for example, rectangular in shape when viewed in the axial direction. One end 30b is connected to one end of the linear portion 30a on the circumferential direction side (+θ side). One end 30b is one end of the magnet insertion hole 30 on one side in the circumferential direction. The other end portion 30c is connected to the other end portion (- θ side) of the linear portion 30a in the circumferential direction. The other end 30c is the end on the other side in the circumferential direction of the magnet insertion hole 30.

The magnet 40 is accommodated in the magnet insertion hole 30. The magnet 40 extends along the magnet insertion hole 30 when viewed in the axial direction. The magnet 40 extends in a direction orthogonal to the radial direction when viewed in the axial direction. The shape of the magnet 40 viewed in the axial direction is, for example, a shape that is line-symmetrical with respect to the magnetic pole center line IL 1. The magnet 40 is, for example, rectangular in shape when viewed in the axial direction. Although not shown, the magnet 40 is, for example, rectangular parallelepiped. Although not shown, the magnet 40 is provided throughout the entire axial direction in the magnet insertion hole 30, for example.

The magnet 40 is disposed so that both ends in the extending direction are separated from both ends in the extending direction of the magnet insertion hole 30 when viewed in the axial direction. One end portion 30b and the other end portion 30c are disposed adjacent to each other on both sides of the magnet 40 in a direction in which the magnet 40 extends, as viewed from the axial direction. Here, in the present embodiment, the one end portion 30b constitutes the first magnetic flux barrier portion 52a. The other end portion 30c constitutes a second magnetic flux barrier portion 52b. That is, the rotor core 20 has a first magnetic flux barrier portion 52a and a second magnetic flux barrier portion 52b arranged to sandwich the magnet 40 in the direction in which the magnet 40 extends, as viewed in the axial direction. The first and second flux barrier portions 52a and 52b are each arc-shaped extending from the circumferential end of the magnet 40 to a side away from the magnet 40 in the circumferential direction.

The rotor core 20 of the present embodiment has a third magnetic flux barrier 53. The third flux barrier 53 is arranged between the second flux barrier 52b and the q-axis IL2 in the circumferential direction when viewed in the axial direction. That is, the third magnetic flux barrier 53 is disposed adjacent to only the second magnetic flux barrier 52b located on the other side in the circumferential direction opposite to the rotation direction of the rotor, from among the first magnetic flux barrier 52a and the second magnetic flux barrier 52b, in the circumferential direction. The q-axis IL2 is an axis extending in a direction electrically perpendicular to the magnetic pole center line (d-axis) IL 1. The third flux barrier 53 extends along the q-axis IL2 from the outer periphery of the rotor core 20 at least to a virtual line 41 overlapping the radially inner end surface of the magnet 40 when viewed in the axial direction.

The third flux barrier portion 53 has a J-shaped claw shape when viewed in the axial direction. The third flux barrier 53 has a first portion 53a and a second portion 53b. The first portion 53a extends from the outer periphery of the rotor core 20 to the radially inner side of the virtual line 41 along the q-axis IL2 as viewed in the axial direction. The first portion 53a extends parallel to the q-axis IL 2. The shortest distance W1 in the circumferential direction between the second magnetic flux barrier portion 52b and the first portion 53a of the third magnetic flux barrier portion 53 is shorter than the shortest distance W2 in the circumferential direction between the third magnetic flux barrier portion 53 and the q-axis IL 2. The shortest distance W1 and the shortest distance W2 are shorter than the circumferential dimension W3 of the first portion 53a in the third magnetic flux barrier 53, respectively.

The second portion 53b extends from a position radially inward of the virtual line 41 in the first portion 53a toward the circumferential direction one side. The circumferential one-side end of the second portion 53b overlaps the magnet 40 in the radial direction. The shortest distance W4 between the second magnetic flux barrier 52b and the second portion 53b in the radial direction is shorter than the shortest distance W5 between the end surface of the magnet 40 on the inner side in the radial direction and the second portion 53b in the radial direction. The shortest distance W4 is shorter than the shortest distance W1.

As shown in fig. 4, the driving torque is generated by the large flux ring FL shown by the two-dot chain line, but when the third flux barrier 53 is not provided, a region M1 where the magnetic flux leakage is generated and the magnetic flux density is high exists between the second flux barrier 52b and the q-axis IL2 on the other side in the circumferential direction of the magnet 40. The third flux barrier 53 is disposed between the second flux barrier 52b and the q-axis IL2 in the circumferential direction as viewed in the axial direction, and is disposed so as to extend along the q-axis IL2 to the virtual line 41 overlapping the end surface on the radially inner side of the magnet 40, whereby the flux leakage in the region M1 can be suppressed.

In the embodiment, the first portion 53a of the third magnetic flux barrier portion 53 is arranged between the second magnetic flux barrier portion 52b and the q-axis IL2 in the circumferential direction when viewed in the axial direction, whereby the region M1 can be reduced and the magnetic flux leakage can be reduced as shown in fig. 5. As a result, the driving torque can be increased by the large magnetic flux ring FL. The second portion 53b extending radially inward from the virtual line 41 of the first portion 53a overlaps the magnet 40 in the radial direction, thereby preventing the leakage magnetic flux from flowing into the magnet 40 and preventing the leakage magnetic flux from entering the magnetic flux ring FL. As a result, the driving torque can be increased by the large magnetic flux ring FL.

In the embodiment, the shortest distance W1 between the second magnetic flux barrier 52b and the first portion 53a of the third magnetic flux barrier 53 in the circumferential direction is shorter than the shortest distance W2 between the third magnetic flux barrier 53 and the q-axis IL2 in the circumferential direction when viewed in the axial direction, and therefore, the magnetic resistance between the second magnetic flux barrier 52b and the first portion 53a of the third magnetic flux barrier 53 can be increased. As a result, the magnetic flux that reduces the driving torque is less likely to pass, and the reduction in the driving torque can be suppressed.

Since the magnetic flux passing between the third magnetic flux barrier 53 and the q-axis IL2 is a magnetic flux contributing to an increase in driving torque, the shortest distance W2 is larger than the shortest distance W1, which contributes to an increase in driving torque.

As shown in fig. 6, the driving torque varies according to the circumferential dimension W3 of the first portion 53 a. In the present embodiment, when the rotor core 20 having a diameter of 54mm is used, the driving torque can be further increased when the dimension W3 is 1.2mm or more and 1.3mm or less.

If the shortest distance between the second magnetic flux barrier 52b and the second portion 53b in the radial direction is W4 and the shortest distance between the radially inner end surface of the magnet 40 and the second portion 53b in the radial direction is W5, the shortest distance W4 is shorter than the shortest distance W5. By making the shortest distance W4 shorter than the shortest distance W5, it is possible to prevent the leaking magnetic flux from flowing to the magnet 40 and to suppress the leaking magnetic flux from entering the magnetic flux ring FL. As a result, the driving torque can be increased by the large magnetic flux ring FL.

The shortest distance W4 is preferably shorter than the shortest distance W1. By making the shortest distance W4 shorter than the shortest distance W1, the leaking magnetic flux can be further prevented from flowing to the magnet 40.

If the radial dimension of the tip of the second portion 53b is W6 (mm), the drive torque varies according to the dimension W6 as shown in fig. 7. In the embodiment, when the rotor core 20 having a diameter of 54mm is used, the driving torque can be further increased when the dimension W6 is 1.8mm or more and 1.9mm or less.

If the length of the radially outer edge of the second portion 53b extending circumferentially from the first portion 53a is W7 (mm) as shown in fig. 3, the drive torque varies according to the length W7 as shown in fig. 8. In the embodiment, when the rotor core 20 having a diameter of 54mm is used, the driving torque can be further increased when the dimension W7 is 1.55mm or more and 1.65mm or less.

For example, when the third flux barriers 53 are provided on both sides in the circumferential direction, the presence of the third flux barriers disposed on one side in the circumferential direction reduces the magnetic path between the first flux barriers 52a and the q-axis IL2, and increases the magnetic resistance. Therefore, the magnetic flux that generates the reluctance torque is hard to pass, and the drive torque is reduced.

In the embodiment, the third magnetic flux barrier 53 is disposed between the second magnetic flux barrier 52b and the q-axis IL2 in the circumferential direction, but is not disposed between the first magnetic flux barrier 52a and the q-axis IL2, as viewed in the axial direction. As a result, the magnetic path between the first flux barrier 52a and the q-axis IL2 increases, and the magnetic resistance decreases. Therefore, the magnetic flux that generates the reluctance torque easily passes through, and the drive torque can be increased.

[ second embodiment of rotating Electrical machine ]

A second embodiment of the rotating electrical machine 1 will be described with reference to fig. 9.

In the drawings, the same components as those of the first embodiment shown in fig. 1 to 8 are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 9, the third flux barrier 53 of the present embodiment extends linearly along the q-axis IL2 from the outer periphery of the rotor core 20 at least to the virtual line 41 overlapping the radially inner end surface of the magnet 40 when viewed in the axial direction. The third flux barrier 53 extends from the outer periphery of the rotor core 20 to the radially inner side of the virtual line 41 in parallel with the q-axis IL2 when viewed in the axial direction. The third magnetic flux barrier 53 is groove-shaped extending parallel to the q-axis IL 2.

The shortest circumferential distance W1 between the second flux barrier portion 52b and the third flux barrier portion 53 is shorter than the shortest circumferential distance W2 between the third flux barrier portion 53 and the q-axis IL 2. The shortest distance W1 and the shortest distance W2 are shorter than the circumferential dimension W3 of the third flux barrier 53.

The other structures are the same as those of the first embodiment.

In the rotary electric machine 1 according to the second embodiment, the same operations and effects as those in the case of providing the first portion 53a in the third magnetic flux barrier 53 described in the first embodiment can be obtained.

Examples

The effects of the present invention will be more clearly understood from the following examples. The present invention is not limited to the following examples, and may be implemented with appropriate modifications within the scope of not changing the gist thereof.

Examples 1 to 2 and comparative examples 1 to 5

In this example, samples of examples 1 to 2 and comparative examples 1 to 5 were set according to the specifications shown in the following [ Table 1 ]. The sample of example 1 is a sample in which the third magnetic flux barrier portion of the claw type in the first embodiment shown in fig. 3 is provided on the other side in the circumferential direction.

The sample of example 2 is a sample in which the third magnetic flux barrier portion of the groove shape in the second embodiment shown in fig. 9 is provided on the other side in the circumferential direction.

The sample of comparative example 1 was a sample in which the third magnetic flux barrier portion was not provided.

The sample of comparative example 2 is a sample in which the third magnetic flux barrier portion of the claw type is provided only on one side in the circumferential direction with respect to the sample of example 1.

The sample of comparative example 3 is a sample in which the third magnetic flux barriers of the claw type are provided on both sides in the circumferential direction with respect to the sample of example 1.

The sample of comparative example 4 is a sample in which the groove-shaped third magnetic flux barrier portion is provided only on one side in the circumferential direction with respect to the sample of example 2.

The sample of comparative example 5 is a sample in which the third magnetic flux barrier portions of the groove type are provided on both sides in the circumferential direction with respect to the sample of example 2.

Regarding the samples of examples 1 to 2 and comparative examples 2 to 5, the driving torque when the sample of comparative example 1 was used was set to 100%, and the ratio of the driving torque when the samples of each example were used was found by analysis.

TABLE 1

As shown in table 1, in the samples of examples 1 to 2 in which the third magnetic flux barrier portion was provided on the other side in the circumferential direction, the driving torque was able to be increased as compared with the sample of comparative example 1 in which the third magnetic flux barrier portion was not provided. In the sample of example 1 provided with the claw-type third magnetic flux barrier portion, the driving torque can be increased as compared with the sample of example 2 provided with the groove-type third magnetic flux barrier portion.

On the other hand, in the samples of comparative examples 2 and 4 in which the third magnetic flux barrier portion is provided only on one side in the circumferential direction, and in the samples of comparative examples 3 and 5 in which the third magnetic flux barrier portion is provided on both sides in the circumferential direction, the driving torque is smaller than that in the sample of comparative example 1 in which the third magnetic flux barrier portion is not provided.

While the preferred embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the examples. The shapes, combinations, and the like of the respective constituent members shown in the above examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

The rotary electric machine to which the present invention is applied is not limited to the motor, but may be a generator. In this case, the rotating electrical machine may be a three-phase alternator. The use of the rotary electric machine is not particularly limited. The rotating electric machine may be mounted on a vehicle, for example, or may be mounted on a device other than the vehicle. The number of poles and slots of the rotating electrical machine is not particularly limited. In the rotating electric machine, the coil may be formed by any winding method. The structures described in the present specification can be appropriately combined within a range not contradicting each other.

Claims (7)

1. An electric rotating machine, comprising:

a rotor rotatable about a central axis to one side in a circumferential direction; and

a stator located radially outside the rotor,

the rotor includes:

a rotor core having a plurality of magnet insertion holes; and

a plurality of magnets which are respectively accommodated in the magnet insertion holes,

the magnet extends in a direction perpendicular to the radial direction when viewed in the axial direction,

the rotor core includes:

a first magnetic flux barrier portion disposed on one side of the magnet in the circumferential direction when viewed in the axial direction;

a second magnetic flux barrier portion disposed on the other side in the circumferential direction of the magnet when viewed in the axial direction; and

a third magnetic flux barrier portion disposed between the second magnetic flux barrier portion and the q-axis in the circumferential direction when viewed in the axial direction,

the third flux barrier portion extends from the outer periphery of the rotor core along the q-axis at least to a virtual line overlapping with the radially inner end surface of the magnet when viewed in the axial direction.

2. The rotating electrical machine according to claim 1, wherein,

the shortest distance between the second magnetic flux barrier portion and the third magnetic flux barrier portion in the circumferential direction is shorter than the shortest distance between the third magnetic flux barrier portion and the q-axis in the circumferential direction.

3. The rotating electrical machine according to claim 1 or 2, wherein,

the third magnetic flux barrier includes:

a first portion extending radially inward from the virtual line along the q-axis from an outer periphery of the rotor core; and

a second portion extending from a position radially inward of the virtual line toward one side in the circumferential direction.

4. A rotary electric machine according to claim 3, wherein,

the shortest distance between the second magnetic flux barrier portion and the first portion in the circumferential direction is shorter than the shortest distance between the first portion and the q-axis in the circumferential direction.

5. The rotating electrical machine according to claim 3 or 4, wherein,

the second portion overlaps the magnet in a radial direction.

6. The rotating electrical machine according to claim 5, wherein,

the shortest distance between the second magnetic flux barrier and the second portion in the radial direction is shorter than the shortest distance between the end surface of the magnet on the inner side in the radial direction and the second portion in the radial direction.

7. The rotating electrical machine according to claim 5 or 6, wherein,

the shortest distance between the second magnetic flux barrier portion and the second portion in the radial direction is shorter than the shortest distance between the second magnetic flux barrier portion and the first portion in the circumferential direction.