JP2023145119A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine capable of improving a driving torque.SOLUTION: A rotary electric machine comprises: a rotatable rotor; a stator that is positioned on an outer side of the rotor in a radial direction. The rotor includes: a rotor core 20 that includes a plurality of magnet insertion holes 30; and a plurality of magnets 40 that is housed into each of the plurality of magnet insertion holes 30. Each magnet 40 is extended in a direction orthogonal to a radial direction in view of a shaft direction. The rotor core 20 includes: a first flux barrier part 52a that is arranged to one side of each magnet 40 in a peripheral direction in view of the shaft direction; a second flux barrier part 52b that is arranged to the other side of each magnet 40 in the peripheral direction; and a third flux barrier part 53 that is arranged between the second flux barrier part 52b and a q-shaft IL2 in the peripheral direction. The third flux barrier part 53 is extended at least to a virtual line overlapped with an end surface of an inner side of each magnet 40 in the radial direction from the outer periphery of the rotor core 20 along the q-shaft IL2.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotating electrical machine.

2. Description of the Related Art Rotating electric machines are known that include a rotor core and permanent magnets arranged in holes provided in the rotor core. For example, Patent Document 1 discloses a motor having an asymmetrical gap serving as magnetic resistance at both circumferential ends of a magnetic pole portion. The motor disclosed in Patent Document 1 is optimized for rotation in one direction by making the gap on the downstream side of the rotor in the rotational direction larger than the gap on the upstream side in the rotational direction.

Japanese Patent Application Publication No. 2010-252530

In the motor disclosed in Patent Document 1, in addition to a large loop of magnetic flux that flows into each iron core portion via the inside of the rotor core so as to bypass each air gap provided at both circumferential ends of each magnetic pole portion, rotation A small loop of magnetic flux leaks around the edge of the permanent magnet on the upstream side. A problem arises in that the driving torque decreases due to magnetic flux leakage.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a rotating electrical machine that improves drive torque.

One aspect of the rotating electric machine of the present invention includes a rotor that is rotatable to one side in the circumferential direction about a central axis, and a stator that is located outside the rotor in the radial direction, and the rotor has a plurality of magnets inserted therein. The rotor core includes a rotor core having a hole, and a plurality of magnets respectively housed inside the plurality of magnet insertion holes, the magnets extending in a direction perpendicular to the radial direction when viewed in the axial direction, and the rotor core having: a first flux barrier section disposed on one circumferential side of the magnet when viewed in the axial direction; a second flux barrier section disposed on the other circumferential side of the magnet when viewed in the axial direction; a third flux barrier section disposed between the second flux barrier section and the q-axis in the circumferential direction, and when seen in the axial direction, the third flux barrier section is arranged between the rotor core and the q-axis. The magnet extends along the q-axis from the outer periphery to at least an imaginary line that overlaps the radially inner end surface of the magnet.

According to one aspect of the present invention, drive torque can be improved in a rotating electric machine.

FIG. 1 is a sectional view showing a rotating electric machine according to a first embodiment. FIG. 2 is a partial sectional view showing a part of the rotating electrical machine of the first embodiment, and is a sectional view taken along line II-II in FIG. FIG. 3 is a sectional view showing the magnetic pole portion of the rotor according to the first embodiment. FIG. 4 is a diagram showing the magnetic flux density when the third flux barrier section is not provided. FIG. 5 is a diagram showing the magnetic flux density when the third flux barrier section is provided on the other side in the circumferential direction. FIG. 6 is a diagram showing the relationship between the circumferential dimension and torque of the first portion in the third flux barrier section. FIG. 7 is a diagram showing the relationship between the radial dimension and torque of the second portion in the third flux barrier section. FIG. 8 is a diagram showing the relationship between torque and the length of the second portion of the third flux barrier portion extending in the circumferential direction from the first portion. FIG. 9 is a sectional view showing the magnetic pole portion of the rotor according to the second embodiment.

Hereinafter, a rotating electric machine according to an embodiment of the present invention will be described with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily modified within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each structure easier to understand, the scale, number, etc. of each structure may be different from the actual structure.

The Z-axis direction appropriately shown in each figure is an up-down direction in which the positive side is the "upper side" and the negative side is the "lower side." A central axis J shown as appropriate in each figure is a virtual line that is parallel to the Z-axis direction and extends in the vertical direction. In the following explanation, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as the "axial direction," and the radial direction centered on the central axis J is simply referred to as the "radial direction." The circumferential direction centered on is simply called the "circumferential direction." Arrows θ appropriately shown in each figure indicate the circumferential direction. The arrow θ is oriented counterclockwise around the central axis J when viewed from above. In the following explanation, the side in the circumferential direction where the arrow θ is directed with a certain object as a reference, that is, the side that proceeds counterclockwise when viewed from above, is referred to as "one side in the circumferential direction", and the side in the circumferential direction with a certain object as a reference Of these, the side opposite to the side toward which the arrow θ is directed, that is, the side proceeding clockwise when viewed from above, is called "the other side in the circumferential direction."

Note that the terms "vertical direction, upper side," and "lower side" are simply names used to explain the arrangement of each part, and the actual arrangement may be other than those indicated by these names. There may be.

[First embodiment of rotating electric machine]
As shown in FIG. 1, the rotating electrical machine 1 is an inner rotor type rotating electrical machine.
In this embodiment, the rotating electrical machine 1 is a three-phase AC rotating electrical machine. The rotating electric machine 1 is, for example, a three-phase motor that is driven by being supplied with three-phase AC power. The rotating electric machine 1 includes a housing 2, a rotor 10, a stator 60, a bearing holder 4, and bearings 5a and 5b.

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

Stator 60 is located on the outside of rotor 10 in the radial direction. Stator 60 includes a stator core 61, an insulator 64, and a plurality of coils 65. Stator core 61 has a core back 62 and a plurality of teeth 63. The core back 62 is located on the radially outer side of the rotor core 20, which will be described later. Note that in FIG. 2 below, illustration of the insulator 64 is omitted.

As shown in FIG. 2, the core back 62 has an annular shape surrounding the rotor core 20. The core back 62 has, for example, an annular shape centered on the central axis J.

The plurality of teeth 63 extend radially inward from the core back 62. The plurality of teeth 63 are arranged side by side at intervals in the circumferential direction. For example, the plurality of teeth 63 are arranged at equal intervals all around the circumferential direction. For example, twelve teeth 63 are provided. That is, the number of slots 67 in the rotating electric machine 1 is, for example, twelve.

A plurality of coils 65 are attached to stator core 61. As shown in FIG. 1, the plurality of coils 65 are attached to the teeth 63 via an insulator 64, for example. In this embodiment, the coil 65 is wound in a distributed manner. In other words, each coil 65 is wound across a plurality of teeth 63. In this embodiment, the coil 65 is fully wound. That is, the circumferential pitch between the slots of the stator 60 into which the coils 65 are inserted is equal to the circumferential pitch of the magnetic poles that occurs when the stator 60 is supplied with three-phase AC power. The number of poles of the rotating electric machine 1 is, for example, eight. That is, the rotating electrical machine 1 is, for example, an 8-pole, 12-slot rotating electrical machine.

The rotor 10 is rotatable around 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 has a cylindrical shape that extends in the axial direction centering on the central axis J. As shown in FIG. 1, the shaft 11 is rotatably supported around a central axis J by bearings 5a and 5b.

Rotor core 20 is a magnetic material. The rotor core 20 is fixed to the outer peripheral surface of the shaft 11. The rotor core 20 has a through hole 21 that passes through the rotor core 20 in the axial direction. As shown in FIG. 2, the through hole 21 has a circular shape centered on the central axis J when viewed in the axial direction. The shaft 11 is passed through the through hole 21 . The shaft 11 is fixed within the through hole 21 by, for example, press fitting. Although not shown, the rotor core 20 is configured by, for example, a plurality of electromagnetic steel sheets laminated in the axial direction.

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

The types of the plurality of magnets 40 are not particularly limited. The magnet 40 may be, for example, a neodymium magnet or a ferrite magnet. The plurality of magnets 40 constitute poles. In this embodiment, a plurality of magnets 40 are provided at intervals in the circumferential direction. For example, eight magnet insertion holes 30 and eight magnets 40 are provided.

The rotor 10 has a plurality of magnetic pole parts 70 each including one magnet insertion hole 30 and one magnet 40. For example, eight magnetic pole parts 70 are provided. For example, the plurality of magnetic pole parts 70 are arranged at equal intervals all around the circumferential direction. The plurality of magnetic pole parts 70 include a plurality of magnetic pole parts 70N whose magnetic poles on the outer circumferential surface of the rotor core 20 are north poles, and a plurality of magnetic pole parts 70S whose magnetic poles on the outer circumferential surface of the rotor core 20 are south poles. For example, four magnetic pole parts 70N and four magnetic pole parts 70S are provided. The four magnetic pole parts 70N and the four magnetic pole parts 70S are arranged alternately along the circumferential direction. The configuration of each magnetic pole portion 70 is the same except that the magnetic poles on the outer peripheral surface of the rotor core 20 are different and the positions in the circumferential direction are different.

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

For example, a magnetic pole center line IL1 passes through the circumferential center of the magnet insertion hole 30 when viewed in the axial 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 when viewed in the axial direction is, for example, a line-symmetrical shape about the magnetic pole center line IL1. The magnet insertion hole 30 is located at the outer periphery of the rotor core 20 in the radial direction.

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

The magnet 40 is housed inside 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 perpendicular to the radial direction when viewed in the axial direction. The shape of the magnet 40 when viewed in the axial direction is, for example, a line-symmetrical shape with respect to the magnetic pole center line IL1. For example, the magnet 40 has a rectangular shape when viewed in the axial direction. Although not shown, the magnet 40 has, for example, a rectangular parallelepiped shape. Although not shown, the magnet 40 is provided, for example, throughout the magnet insertion hole 30 in the axial direction.

When viewed in the axial direction, both ends of the magnet 40 in the stretching direction are spaced apart from both ends of the magnet insertion hole 30 in the stretching direction. One end 30b and the other end 30c are arranged adjacent to each other on both sides of the magnet 40 in the direction in which the magnet 40 extends when viewed in the axial direction. Here, in this embodiment, the one end portion 30b constitutes the first flux barrier portion 52a. The other end portion 30c constitutes a second flux barrier portion 52b. That is, the rotor core 20 includes a first flux barrier section 52a and a second flux barrier section 52b, which are arranged to sandwich the magnet 40 in the direction in which the magnet 40 extends when viewed in the axial direction. The first flux barrier section 52a and the second flux barrier section 52b each have an arc shape extending from the circumferential end of the magnet 40 in a direction away from the magnet 40 in the circumferential direction.

The rotor core 20 of this embodiment has a third flux barrier section 53. The third flux barrier section 53 is disposed between the second flux barrier section 52b and the q-axis IL2 in the circumferential direction when viewed in the axial direction. In other words, of the first flux barrier section 52a and the second flux barrier section 52b, the third flux barrier section 53 includes only the second flux barrier section 52b located on the other side in the circumferential direction opposite to the rotational direction of the rotor. are arranged adjacent to each other in the circumferential direction. The q-axis IL2 is an axis that extends electrically in a direction perpendicular to the magnetic pole center line (d-axis) IL1. The third flux barrier portion 53 extends along the q-axis IL2 from the outer periphery of the rotor core 20 to at least the imaginary line 41 that overlaps the radially inner end surface of the magnet 40 when viewed in the axial direction.

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

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

As shown in FIG. 4, the driving torque is generated by the large magnetic flux loop FL shown by the two-dot chain line, but if the third flux barrier section 53 is not provided, the second There is a region M1 where magnetic flux leaks and has a high magnetic flux density between the No. 2 flux barrier portion 52b and the q-axis IL2. The third flux barrier section 53 is disposed between the second flux barrier section 52b and the q-axis IL2 in the circumferential direction when viewed in the axial direction, and extends along the q-axis up to the imaginary line 41 that overlaps with the radially inner end surface of the magnet 40. By extending and arranging along IL2, magnetic flux leakage in region M1 can be suppressed.

In the embodiment, as shown in FIG. Furthermore, the region M1 can be made smaller and magnetic flux leakage can be reduced. As a result, the driving torque can be improved due to the large magnetic flux loop FL. The second portion 53b extending from a position radially inside the virtual line 41 in the first portion 53a to one side in the circumferential direction overlaps the magnet 40 in the radial direction, thereby preventing leaked magnetic flux from flowing to the magnet 40. , can be suppressed from entering the magnetic flux loop FL. As a result, the driving torque can be improved due to the large magnetic flux loop FL.

In the embodiment, when viewed in the axial direction, the shortest circumferential distance W1 between the second flux barrier section 52b and the first portion 53a of the third flux barrier section 53 is the same as the shortest distance W1 between the third flux barrier section 53 and the q-axis IL2. Since it is shorter than the shortest distance W2 in the circumferential direction, the magnetic resistance between the second flux barrier section 52b and the first portion 53a of the third flux barrier section 53 can be increased. As a result, it becomes difficult for the magnetic flux that reduces the drive torque to pass through, and a decrease in the drive torque can be suppressed.

The magnetic flux passing between the third flux barrier section 53 and the q-axis IL2 is a magnetic flux that contributes to an increase in drive torque, so the shortest distance W2 is larger than the shortest distance W1, which can contribute to an increase in drive torque. .

As shown in FIG. 6, the driving torque varies depending on the circumferential dimension W3 of the first portion 53a. In this embodiment, when the rotor core 20 with a diameter of 54 mm is used, the driving torque can be increased when the dimension W3 is 1.2 mm or more and 1.3 mm or less.

When the shortest radial distance between the second flux barrier section 52b and the second portion 53b is W4, and the shortest radial distance between the radially inner end face of the magnet 40 and the second portion 53b is W5, the shortest distance W4 is It is shorter than the shortest distance W5. Since the shortest distance W4 is shorter than the shortest distance W5, it is possible to prevent leaked magnetic flux from flowing to the magnet 40 and to prevent it from entering the magnetic flux loop FL. As a result, the driving torque can be improved due to the large magnetic flux loop FL.

It is preferable that the shortest distance W4 is shorter than the shortest distance W1. By making the shortest distance W4 shorter than the shortest distance W1, it is possible to further inhibit leaked magnetic flux from flowing to the magnet 40.

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

As shown in FIG. 3, if the length of the radially outer edge of the second portion 53b extending in the circumferential direction from the first portion 53a is W7 (mm), as shown in FIG. The value varies depending on W7. In the embodiment, when the rotor core 20 with a diameter of 54 mm is used, the driving torque can be increased when the dimension W7 is 1.55 mm or more and 1.65 mm or less.

For example, in the case where the third flux barrier parts 53 are provided on both sides in the circumferential direction, the presence of the third flux barrier part arranged on one side in the circumferential direction makes it possible for the first flux barrier part 52a and the q-axis IL2 to The magnetic path between them becomes smaller and the magnetic resistance increases. For this reason, it becomes difficult for the magnetic flux that generates reluctance torque to pass through, resulting in a decrease in driving torque.

In the embodiment, the third flux barrier section 53 is disposed between the second flux barrier section 52b and the q-axis IL2 in the circumferential direction when viewed in the axial direction, and is arranged between the first flux barrier section 52a and the q-axis IL2. It is not placed in between. As a result, the magnetic path between the first flux barrier section 52a and the q-axis IL2 becomes larger, and the magnetic resistance becomes smaller. Therefore, the magnetic flux that generates reluctance torque can easily pass through, and the driving torque can be increased.

[Second embodiment of rotating electric machine]
A second embodiment of the rotating electric machine 1 will be described with reference to FIG. 9.
In this figure, the same elements as those of the first embodiment shown in FIGS. 1 to 8 are denoted by the same reference numerals, and the explanation thereof will be omitted.

As shown in FIG. 9, the third flux barrier section 53 of this embodiment extends along the q-axis IL2 from the outer periphery of the rotor core 20 to at least the imaginary line 41 that overlaps with the radially inner end surface of the magnet 40, when viewed in the axial direction. It extends in a straight line. The third flux barrier portion 53 extends from the outer periphery of the rotor core 20 radially inward from the virtual line 41 in parallel to the q-axis IL2 when viewed in the axial direction. The third flux barrier section 53 has a groove shape extending parallel to the q-axis IL2.

The shortest distance W1 in the circumferential direction between the second flux barrier part 52b and the third flux barrier part 53 is shorter than the shortest distance W2 in the circumferential direction between the third flux barrier part 53 and the q-axis IL2. The shortest distance W1 and the shortest distance W2 are each shorter than the circumferential dimension W3 of the third flux barrier portion 53.
The other configurations are the same as those in the first embodiment.

In the rotating electrical machine 1 according to the second embodiment, the same operation and effect as in the case where the first portion 53a of the third flux barrier section 53 described in the first embodiment is provided can be obtained.

Hereinafter, the effects of the present invention will be made clearer by way of Examples. It should be noted that the present invention is not limited to the following examples, and can be implemented with appropriate changes without changing the gist thereof.

(Example 1-2, Comparative Example 1-5)
In this example, samples of Example 1-2 and Comparative Example 1-5 were set according to the specifications shown in Table 1 below. The sample of Example 1 is a sample in which the claw-shaped third flux barrier portion of 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 groove-shaped third flux barrier section in the second embodiment shown in FIG. 9 is provided on the other side in the circumferential direction.

The sample of Comparative Example 1 is a sample in which the third flux barrier section is not provided.
The sample of Comparative Example 2 is a sample in which a claw-shaped third flux barrier portion is provided only on one side in the circumferential direction compared to the sample of Example 1.
The sample of Comparative Example 3 is a sample in which claw-shaped third flux barrier parts are provided on both sides in the circumferential direction compared to the sample of Example 1.
The sample of Comparative Example 4 is a sample in which the groove-shaped third flux barrier portion is provided only on one side in the circumferential direction compared to the sample of Example 2.
The sample of Comparative Example 5 is a sample in which groove-shaped third flux barrier portions are provided on both sides in the circumferential direction compared to the sample of Example 2.

Regarding the samples of Example 1-2 and Comparative Example 2-5, the driving torque when using the sample of Comparative Example 1 was set as 100%, and the ratio of the driving torque when using the sample of each example was analyzed. I asked for it.

As shown in Table 1, the sample of Example 1-2 in which the third flux barrier section was provided on the other side in the circumferential direction had a higher driving torque than the sample of Comparative Example 1 in which the third flux barrier section was not provided. I was able to make it bigger. In the sample of Example 1 in which the claw-shaped third flux barrier section was provided, the driving torque could be made larger than in the sample of Example 2 in which the groove-shaped third flux barrier section was provided.

On the other hand, in the samples of Comparative Examples 2 and 4 in which the third flux barrier part was provided only on one side in the circumferential direction, and in the samples of Comparative Examples 3 and 5 in which the third flux barrier part was provided in both sides in the circumferential direction, both 3. The driving torque was smaller than that of the sample of Comparative Example 1 in which no flux barrier portion was provided.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. The various shapes and combinations of the constituent members shown in the above example are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

The rotating electric machine to which the present invention is applied is not limited to a motor, but may be a generator. In this case, the rotating electrical machine may be a three-phase AC generator. The use of the rotating electric machine is not particularly limited. The rotating electrical machine may be mounted on a vehicle, or may be mounted on equipment other than the vehicle, for example. The number of poles and the number of slots of the rotating electric machine are not particularly limited. In a rotating electrical machine, a coil may be wound in any manner. The configurations described above in this specification can be combined as appropriate within a mutually consistent range.

DESCRIPTION OF SYMBOLS 1... Rotating electric machine, 10... Rotor, 20... Rotor core, 30... Magnet insertion hole, 40... Magnet, 41... Virtual line, 52a... First flux barrier part, 52b... Second flux barrier part, 53... Third flux barrier Part, 53a...first part, 53b...second part, 60...stator, 70, 70N, 70S...magnetic pole part, IL1...magnetic pole center line (d axis), IL2...q axis

Claims (7)

a rotor that can rotate to one side in the circumferential direction around a central axis;
a stator located on the radially outer side of the rotor;
Equipped with
The rotor is
a rotor core having multiple magnet insertion holes;
a plurality of magnets respectively housed inside the plurality of magnet insertion holes;
has
The magnet extends in a direction perpendicular to the radial direction when viewed in the axial direction,
The rotor core is
a first flux barrier portion disposed on one circumferential side of the magnet when viewed in the axial direction;
a second flux barrier portion disposed on the other circumferential side of the magnet when viewed in the axial direction;
a third flux barrier section disposed between the second flux barrier section and the q-axis in the circumferential direction when viewed in the axial direction;
has
When viewed in the axial direction, the third flux barrier portion extends along the q-axis from the outer periphery of the rotor core to at least an imaginary line that overlaps a radially inner end surface of the magnet. The shortest distance in the circumferential direction between the second flux barrier part and the third flux barrier part is shorter than the shortest distance in the circumferential direction between the third flux barrier part and the q-axis.
The rotating electric machine according to claim 1. The third flux barrier section is
a first portion extending along the q-axis from an outer periphery of the rotor core radially inward from the imaginary line;
a second portion extending to one side in the circumferential direction from a position radially inner than the virtual line;
has,
The rotating electric machine according to claim 1 or 2. The shortest distance in the circumferential direction between the second flux barrier part and the first part is shorter than the shortest distance in the circumferential direction between the first part and the q-axis.
The rotating electric machine according to claim 3. the second portion radially overlaps the magnet;
The rotating electric machine according to claim 3 or 4. The shortest distance in the radial direction between the second flux barrier part and the second portion is shorter than the shortest distance in the radial direction between the radially inner end face of the magnet and the second portion.
The rotating electric machine according to claim 5. The shortest distance in the radial direction between the second flux barrier part and the second part is shorter than the shortest distance in the circumferential direction between the second flux barrier part and the first part.
The rotating electric machine according to claim 5 or 6.

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