WO2023189909A1 - Rotor and rotating electric machine - Google Patents

Abstract

This rotor is rotatable about the central axis and comprises: a rotor core; and annular conductive parts arranged at axially opposite sides of the rotor core. The rotor core has a plurality of flux barrier groups arranged at intervals along the circumferential direction. The plurality of flux barrier groups each include a plurality of flux barriers arranged radially side by side, and the plurality of flux barriers each have a shape protruding radially inward as viewed in the axial direction. One or more flux barriers, of the plurality of flux barriers in each of the flux barrier groups, have disposed thereinside conductor bodies electrically connected to the annular conductive parts. As viewed in the axial direction, when the half of the outer diameter of the rotor core is defined as Ror, the half of the outer diameter of the annular conductive parts is defined as Roer, and the minimum distance from the central axis line to the radially outermost one of the flux barriers which have disposed thereinside the conductor bodies is defined as Rocb, the relation of Rocb<Roer<Ror is satisfied.

Description

Rotor and rotating electrical machine

The present invention relates to a rotor and a rotating electric machine.

This application is based on Japanese Patent Application No. 2022-051475 filed on March 28, 2022. This application claims priority over that application. The entire contents are incorporated into this application by reference.

A rotating electric machine is known that has a rotor including a rotor core having a plurality of holes and end rings arranged on both sides of the rotor core in the axial direction. For example, the rotor of Patent Document 1 has a plurality of holes that penetrate in the axial direction of the rotor core, and a conductor and a magnet are arranged in the holes.

China Utility Model No. 202134978

Viewed in the axial direction, the outer diameter of the end ring of Patent Document 1 is equivalent to the outer diameter of the rotor core, and a rectangular opening is provided on the radially inner side of the end ring. In such a configuration, the resistance when short-circuiting the conductors electrically connected by the end ring becomes large, and the efficiency during normal rotation of the rotating electric machine may not be sufficiently improved.

In view of the above circumstances, one of the objects of the present invention is to provide a rotor and a rotating electrical machine having a structure that can improve efficiency and torque during normal rotation in the rotating electrical machine.

One aspect of the rotor core of the present invention is a rotor that is rotatable around a central axis, and includes a rotor core and annular conductive parts disposed on both sides of the rotor core in the axial direction. The rotor core is provided with a plurality of flux barrier part groups arranged at intervals in the circumferential direction, and each of the plurality of flux barrier part groups has a plurality of flux barrier parts arranged in line in the radial direction. However, the plurality of flux barrier portions have a shape convex radially inward when viewed from the axial direction. A conductor electrically connected to the annular conductive part is disposed inside at least one flux barrier part among the plurality of flux barrier parts of each flux barrier part group. When viewed from the axial direction, half of the outer diameter of the rotor core is Ror, half of the outer diameter of the annular conductive part is Roer, and from the central axis, in the radial direction of the flux barrier part in which the conductor is arranged. When the shortest distance to the outermost flux barrier section is Rocb, Rocb<Roer<Ror is satisfied.

One aspect of the rotating electric machine of the present invention includes the above-mentioned rotor and a stator located on the radially outer side of the rotor.

According to one aspect of the present invention, it is possible to provide a rotor and a rotating electrical machine having a structure that can improve efficiency and torque during normal rotation in the rotating electrical machine.

FIG. 1 is a sectional view showing a schematic diagram of a rotating electrical machine according to a first embodiment. FIG. 2 is a top view showing the rotor of the first embodiment, and is a view taken along arrow II-II in FIG. FIG. 3 is a sectional view showing the rotor of the first embodiment, and is a sectional view taken along line III-III in FIG. FIG. 4A is a top view showing the rotor of the first embodiment, and is a diagram for explaining dimensions of each component of the rotor. FIG. 4B is a cross-sectional view showing the rotor of the first embodiment, and is a diagram for explaining dimensions of each component of the rotor. FIG. 5 is a sectional view showing a modification of the rotor of the first embodiment. FIG. 6 is a sectional view showing the rotor of the second embodiment. FIG. 7 is a sectional view showing the rotor of the third embodiment. FIG. 8 is a sectional view showing the rotor of the fourth embodiment. FIG. 9 is a sectional view showing a modification of the rotor of the first to fourth embodiments. FIG. 10 is a sectional view showing another modification of the rotor of the first to fourth embodiments. FIG. 11 is a sectional view showing a rotor of Comparative Example 1.

(First embodiment)
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 an imaginary line that is parallel to the Z-axis direction and extends in the vertical direction. In the following description, 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." When viewed from above in the axial direction, the direction of clockwise movement in the circumferential direction is called the +θ side, and the direction of movement counterclockwise is called the -θ side.

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.

The rotating electrical machine 1 of this embodiment shown in FIG. 1 is an inner rotor type motor. As shown in FIG. 1, the rotating electric machine 1 of this embodiment includes a housing 2, a rotor 10, a stator 3, a bearing holder 4, and bearings 5a and 5b. The housing 2 houses therein a rotor 10, a stator 3, a bearing holder 4, and 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 and 5b are, for example, ball bearings.

The stator 3 is located on the outside of the rotor 10 in the radial direction. As shown in FIG. 1, the stator 3 includes a stator core 3a, an insulator 3d, and a plurality of coils 3e. Stator core 3a has a core back 3b and a plurality of teeth 3c. The core back 3b has an annular shape centered on the central axis J. The plurality of teeth 3c extend radially inward from the core back 3b. The plurality of teeth 3c are arranged at equal intervals all around the circumferential direction. The plurality of coils 3e are attached to the stator core 3a via an insulator 3d.

The rotor 10 is rotatable around the central axis J. As shown in FIGS. 1, 2, and 3, the rotor 10 includes a shaft 11, a rotor core 20, a conductor 40, an annular conductive portion 50, and a magnet 60. 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.

The rotor core 20 is a magnetic material. The material of the rotor core 20 is, for example, silicon steel, which has higher magnetic permeability and lower electrical conductivity than an alloy of iron and carbon. The rotor core 20 is fixed to the outer peripheral surface of the shaft 11. The rotor core 20 has a through hole 20a that passes through the rotor core 20 in the axial direction. As shown in FIG. 2, the through hole 20a 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 20a. The shaft 11 is fixed within the through hole 20a 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.

As shown in FIG. 1, the annular conductive parts 50 are arranged at both ends of the rotor core 20 in the axial direction. The annular conductive portion 50 has an annular shape centered on the central axis J. The material constituting the annular conductive portion 50 is a material with high electrical conductivity. Examples of the material constituting the annular conductive portion 50 include aluminum, copper, and an alloy of aluminum and copper.

As shown in FIGS. 2 and 3, the rotor core 20 has a plurality of flux barrier sections 30. In this embodiment, each flux barrier section 30 is constituted by a hole provided in the rotor core 20. For example, the flux barrier section 30 passes through the rotor core 20 in the axial direction. As shown in FIG. 3, each flux barrier section 30 extends along a plane perpendicular to the axial direction, and has a shape that is convex radially inward when viewed in the axial direction. The rotor core 20 is provided with a plurality of sets including two or more flux barrier parts 30. One set of flux barrier sections 30 is also referred to as a flux barrier section group 130. Each flux barrier section group 130 includes a plurality of flux barrier sections 30.

In this embodiment, four flux barrier unit groups 130 are provided. The four flux barrier section groups 130 are hereinafter also referred to as a first flux barrier section group 130A, a second flux barrier section group 130B, a third flux barrier section group 130C, and a fourth flux barrier section group 130D. When viewed in the axial direction, the first flux barrier section group 130A, the second flux barrier section group 130B, the third flux barrier section group 130C, and the fourth flux barrier section group 130D are arranged in this order toward the +θ direction. There is.

The rotor core 20 provided with the flux barrier portion 30 in this manner becomes a rotor core of a synchronous reluctance motor having a magnetic salient pole structure. More specifically, the flux barrier part 30 is difficult for magnetic flux to pass through, and when viewed from the axial direction, the direction between two adjacent flux barrier part groups 130 is a salient pole direction in which magnetic flux can easily pass, and one set of flux barrier part groups A direction in which the magnetic flux is difficult to pass is provided in the center portion of 130 in the circumferential direction. In the following description, the salient pole direction through which the magnetic flux easily passes is referred to as the "d-axis direction", and the direction through which the magnetic flux is difficult to pass is referred to as the "q-axis direction". Since the rotor core 20 has magnetic anisotropy in the q-axis direction and the d-axis direction, reluctance torque is generated when a magnetic field is generated by the stator 3, making it possible to rotate the rotor 10.

Further, the d-axis direction is a radial direction passing through the circumferential center of the magnetic pole portions P of the rotor core 20, and the q-axis direction is a radial direction passing through the circumferential center between circumferentially adjacent magnetic pole portions P. The portion located between circumferentially adjacent magnetic pole portions P will hereinafter be referred to as a magnetic pole intermediate portion M. The q-axis passes through the middle part M of the magnetic pole.
In this way, the rotor 10 is provided with a plurality of magnetic pole parts P provided along the circumferential direction and a plurality of magnetic pole intermediate parts M located between circumferentially adjacent magnetic pole parts P. . The magnetic pole intermediate parts M each have a flux barrier part group 130.

In this embodiment, a conductor 40 and a magnet 60 are arranged within the flux barrier section 30.
A conductor 40 is arranged inside at least one flux barrier section 30 among the plurality of flux barrier sections 30 of each flux barrier section group 130 . The material constituting the conductor 40 has high electrical conductivity. The material constituting the conductor 40 is the same as the material constituting the annular conductive portion 50, and examples thereof include aluminum, copper, and an alloy of aluminum and copper. The material constituting the conductor 40 is a non-ferromagnetic metal so as not to affect the magnetic salient pole structure constituted by the flux barrier section 30.

The conductors 40 disposed within each flux barrier section 30 are electrically connected to the annular conductive section 50, respectively. Therefore, the conductors 40 in each flux barrier section 30 are electrically connected via the annular conductive section 50, and the annular conductive section 50 electrically shorts the conductors 40 in each flux barrier section 30. ing.
The conductor 40 in the flux barrier section 30 is made by heating the metal that will become the conductor 40 and pouring it into the flux barrier section 30.

In this embodiment, the conductor 40 and the annular conductive portion 50 are part of the same single member. For example, molds for the annular conductive part 50 are placed on both sides of the rotor core 20 in the axial direction, and the metal that will become the conductor 40 and the annular conductive part 50 is heated and poured into the flux barrier part 30 and the mold, thereby forming the conductor. 40 and an annular conductive portion 50 are made. At this time, in order to prevent the heated metal from flowing into the void of the flux barrier section 30 where the conductor 40 is not placed, a member for preventing the heated metal from entering is placed in a part of the flux barrier section 30. Pour the metal with.
Note that the conductor 40 and the annular conductive portion 50 may be separate members or may be made of different constituent materials.

A magnet 60 is arranged inside at least one flux barrier section 30 among the plurality of flux barrier sections 30 of each flux barrier section group 130 . The magnet 60 has a rectangular shape when viewed in the axial direction. Although not shown, the magnet 60 has a rectangular parallelepiped shape, for example.
In this embodiment, when viewed in the axial direction, the magnets 60 are arranged at both ends 30f in the extending direction of the flux barrier section 30 in which the conductor 40 is arranged. Magnet 60 is a ferrite magnet. The type of magnet is not particularly limited, and the magnet may be a neodymium magnet.

When the conductor 40 is placed within the flux barrier section 30 of the synchronous reluctance motor, the conductor is placed in a rotating magnetic field. Therefore, when the magnetic field generated by the stator 3 rotates, an induced current flows through the conductor 40 due to electromagnetic induction, and the Lorentz force of the induced current allows the rotor 10 to generate rotational force. In particular, since torque due to Lorentz force can be obtained when the stationary rotor 10 starts rotating, performance at startup can be improved. A synchronous reluctance motor with improved startup characteristics in this way is also called a DOL SynRM (Direct-On-Line Synchronous Reluctance Motor).
Furthermore, the output of the rotating electric machine 1 can be improved by the magnetic force of the magnet placed inside the flux barrier section 30. Therefore, the DOL SynRM in which a magnet is further arranged in the flux barrier section 30 is also called DOL-PMa SynRM (Direct-On-Line Permanent Magnet assisted Synchronous Reluctance Motor).

Hereinafter, the configuration of the flux barrier section 30 of this embodiment will be described in more detail using FIGS. 2, 3, 4A, and 4B. Furthermore, the arrangement relationship between the conductor 40 and magnet 60 disposed within the flux barrier section 30 and the annular conductive section 50 will also be described.

(Flux barrier section 30)
The rotor 10 of this embodiment includes four flux barrier sections 30 including a first flux barrier section 31, a second flux barrier section 32, a third flux barrier section 33, and a fourth flux barrier section 34. It has four flux barrier unit groups 130. The first flux barrier section 31, the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 are arranged in this order from the radially outer side to the radially inner side. . In the flux barrier section group 130 of the present embodiment, among the plurality of flux barrier sections 30, the flux barrier section located at the outermost radial direction is the first flux barrier section 31, and the flux barrier section located at the innermost radial direction is the first flux barrier section 31. is the fourth flux barrier section 34.

In this embodiment, four flux barrier sections 30 are arranged in one flux barrier section group 130. The number of flux barrier sections 30 in one set of flux barrier section group 130 is not limited to four, and two or more flux barrier sections 30 may be arranged. The number of flux barrier sections 30 may be changed as appropriate depending on the size of rotor core 20. Hereinafter, when any one of the first flux barrier section 31, the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 is referred to, it will also simply be referred to as the flux barrier section 30.

The four flux barrier section groups 130 are arranged at equal intervals along the circumferential direction of the rotor 10.
Each set of the flux barrier unit group 130 has the same configuration except that each set is arranged in a position rotated by 90° in the circumferential direction. In the following description of each flux barrier section 30, the flux barrier section 30 included in one representative group among the four flux barrier section groups 130 will be explained.

The first flux barrier section 31, the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 included in the flux barrier section group 130 are not in contact with each other, and the diameter located far apart in direction. In the rotor core 20, a radially outer region of the first flux barrier section 31, a region between two radially adjacent flux barrier sections 30, and a radially inner region of the flux barrier section group 130; is a magnetic path MP through which the magnetic flux generated by the stator 3 flows.

Each flux barrier portion 30 is a polygonal slit consisting of a plurality of line segments when viewed in the axial direction, and is convex inward in the radial direction. In the present embodiment, each flux barrier section 30 is composed of a polygonal line made up of three straight lines, but may be composed of a polygonal line composed of less than three or more than three straight lines.
In this embodiment, each of the flux barrier parts 30 has a line-symmetrical shape with the circumferential center of the magnetic pole intermediate part M as an axis of symmetry when viewed in the axial direction. In this embodiment, the circumferential center of the magnetic pole intermediate portion M is provided at a position overlapping the q-axis.

As shown in FIG. 3, when viewed from the axial direction, each flux barrier section 30 includes a straight section 30a orthogonal to the q-axis, and a straight section 30a that extends outward in the radial direction from the -θ side end of the straight section 30a. The first bent portion 30b has a second bent portion 30c that is bent and extends radially outward from the +θ side end of the straight portion 30a.

The straight parts of the first flux barrier part 31, the second flux barrier part 32, the third flux barrier part 33, and the fourth flux barrier part 34 are defined as a straight part 31a, a straight part 32a, a straight part 33a, and a straight part, respectively. It is designated with the reference numeral 34a.
Hereinafter, when referring to any straight part of the flux barrier section 30, it will also simply be referred to as the straight part 30a.
The straight portion 31a, the straight portion 32a, the straight portion 33a, and the straight portion 34a extend in a direction perpendicular to the q-axis when viewed in the axial direction. That is, when viewed in the axial direction, the straight portions 30a extend parallel to each other.

The first bent portions on the −θ side of the first flux barrier portion 31, the second flux barrier portion 32, the third flux barrier portion 33, and the fourth flux barrier portion 34 are bent into the first bent portion 31b and the first bent portion, respectively. They are referred to by reference numerals as a portion 32b, a first bent portion 33b, and a first bent portion 34b.
Hereinafter, when any first bent part of the flux barrier section 30 is referred to, it will also simply be referred to as a first bent part 30b.

The second bent portions on the +θ side of the first flux barrier portion 31, the second flux barrier portion 32, the third flux barrier portion 33, and the fourth flux barrier portion 34 are bent into the second bent portion 31c and the second bent portion, respectively. They are referred to by reference numerals as a portion 32c, a second bent portion 33c, and a second bent portion 34c.
Hereinafter, when any second bent part of the flux barrier section 30 is referred to, it will also simply be referred to as a second bent part 30c.

The straight portion 30a, the first bent portion 30b, and the second bent portion 30c each have a rectangular shape, for example, when viewed in the axial direction.
When viewed in the axial direction, a first bent portion 30b and a second bent portion 30c extending toward the outer circumferential surface of the rotor 10 are arranged in a polygonal shape at both ends of the straight portion 30a extending in a direction perpendicular to the q-axis. Thus, the flux barrier section 30 is configured. A pair of bent portions including the first bent portion 30b and the second bent portion 30c extend linearly in a direction away from each other as they go radially outward when viewed in the axial direction.

<Bending angle of flux barrier section 30>
In each flux barrier section 30, the angle between the straight section 30a and the first bent section 30b is the same as the angle between the straight section 30a and the second bent section 30c. Hereinafter, the angle between the straight portion 30a and the first bent portion 30b and the angle between the straight portion 30a and the second bent portion 30c will be referred to as a “bending angle”.
In this embodiment, the bending angles of the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 are the same. Therefore, the first bent portion 32b, the first bent portion 33b, and the first bent portion 34b extend parallel to each other when viewed in the axial direction. The second bent portion 32c, the second bent portion 33c, and the second bent portion 34c extend parallel to each other when viewed in the axial direction.
In the flux barrier section group 130, the bending angle of the first flux barrier section 31 is larger than that of the other flux barrier sections 30.
Note that the bending angles may be the same in all flux barrier sections 30. The bending angle of the flux barrier portion 30 located on the outer side in the radial direction may be larger or smaller.

<Length of flux barrier section 30 in stretching direction>
In the following description, the direction in which the flux barrier section 30 extends in a polygonal line shape when viewed in the axial direction will be referred to as the "stretching direction." The directions in which the first flux barrier section 31, the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 extend in the form of a polygonal line when viewed in the axial direction are referred to as a "first stretching direction" and a "first stretching direction," respectively. 2 stretching direction,""third stretching direction," and "fourth stretching direction."

When viewed in the axial direction, the farther the flux barrier part 30 is located on the outer side in the radial direction, the shorter the dimension in the stretching direction of the flux barrier part 30 is. That is, the dimension of the first flux barrier section 31 in the first stretching direction is shorter than the dimension of the second flux barrier section 32 in the second stretching direction. The dimension of the second flux barrier section 32 in the second stretching direction is shorter than the dimension of the third flux barrier section 33 in the third stretching direction. The dimension of the third flux barrier section 33 in the third stretching direction is shorter than the dimension of the fourth flux barrier section 34 in the fourth stretching direction.

When viewed in the axial direction, the circumferential center of the flux barrier portion 30 is the circumferential center of the straight portion 30a.
In this embodiment, the dimensions in the stretching direction of the straight portions 30a in the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 are the same. That is, the dimensions of the straight portion 32a, the straight portion 33a, and the straight portion 34a in the extending direction are the same. In the flux barrier section group 130, the dimension in the stretching direction of the straight section 31a of the first flux barrier section 31 is shorter than the dimension in the stretching direction of the straight section 30a of the flux barrier section 30 excluding the first flux barrier section 31.
Note that the dimensions of the linear portions 30a in the stretching direction may be the same in all flux barrier portions 30. Furthermore, the further the flux barrier section 30 is located on the outer side in the radial direction, the shorter the length of the linear section 30a in the extending direction may be. The longer the flux barrier portion 30 is located on the outer side in the radial direction, the longer the linear portion 30a in the extending direction may be.

When viewed in the axial direction, the farther the first bent portion 30b is located on the outer side in the radial direction, the shorter the dimension in the extending direction of the first bent portion 30b.
When viewed in the axial direction, the second bent portion 30c located on the outer side in the radial direction has a shorter dimension in the extending direction of the second bent portion 30c.
Note that the dimensions of the first bent portion 30b and the second bent portion 30c in the stretching direction may be the same in all flux barrier portions 30. Furthermore, the farther outward the flux barrier section 30 is located in the radial direction, the longer the first bending section 30b and the second bending section 30c may have longer dimensions in the stretching direction.

<Width of flux barrier section 30>
In the following description, the direction perpendicular to the stretching direction of the flux barrier section 30 when viewed in the axial direction will be referred to as the "width direction" of the flux barrier section 30. The dimension of the flux barrier section 30 in the width direction is simply referred to as width. In the straight portion 30a, the width of the flux barrier portion 30 is the dimension in the q-axis direction.
The width of each flux barrier section 30 is uniform in the stretching direction. Thereby, it is possible to prevent the magnetic paths MP between two radially adjacent flux barrier parts 30 from becoming too narrow.

<End portion 30f of flux barrier section 30 in the stretching direction>
Each of the flux barrier sections 30 has an outer end 30f in the stretching direction. The end portion 30f includes a first end portion 30f1 that is an end portion on the −θ side, and a second end portion 30f2 that is an end portion on the +θ side. The first end 30f1 and the second end 30f2 of the flux barrier section 30 are located at the radially outer peripheral edge of the rotor core 20. The radial positions of the first end 30f1 and the second end 30f2 are the same.

<Bridge portion 30g of flux barrier portion 30>
In the flux barrier section group 130, at least one of the flux barrier sections 30 excluding the first flux barrier section 31 located at the radially outermost position has a radially inner first edge 30e1 of the flux barrier section 30. A bridge portion 30g connecting the outer second edge portion 30e2 is provided.
In this embodiment, as shown in FIG. 3, the first flux barrier section 31 having the shortest dimension in the stretching direction is not provided with the bridge section 30g, and the second flux barrier section 32, the third flux barrier section 33 In the fourth flux barrier section 34, bridge sections 30g are arranged at positions overlapping with the q-axis. As a result, the mechanical strength of the rotor 10 can be suitably maintained.

Note that in this specification, "certain parameters are the same" includes not only cases where certain parameters are strictly the same, but also cases where certain parameters are substantially the same. "Certain parameters are substantially the same" includes, for example, that certain parameters are slightly different from each other within the range of tolerance.

(Conductor 40)
In this embodiment, the conductor 40 is disposed inside part of the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34. The conductor 40 is not arranged in the first flux barrier section 31 .
In this way, the flux barrier section 30 in which the conductor 40 is disposed is connected to the second flux barrier section 31, which is disposed radially inwardly from the first flux barrier section 31, which is the most radially outermost part in the flux barrier section group 130. They are a flux barrier section 32, a third flux barrier section 33, and a fourth flux barrier section 34.

When viewed from the axial direction, the conductor 40 is disposed apart from both ends 30f in the extending direction of the flux barrier section 30 where the conductor 40 is disposed.
In the present embodiment, the first end 30f1 and the second end 30f2 of the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 have a region R where the conductor 40 is not arranged. are provided for each. The region R includes a first region R1 arranged on the first end 30f1 side and a second region R2 arranged on the second end 30f2 side. The first region R1 is provided at the first bent portion 30b, and the second region R2 is provided at the second bent portion 30c.
The first region R1 extends from the end surface of the first end portion 30f1 of the flux barrier portion 30 along the first bent portion 30b in the stretching direction. The second region R2 extends from the end surface of the second end portion 30f2 of the flux barrier portion 30 along the second bent portion 30c in the stretching direction.

In each flux barrier section 30, the first region R1 and the second region R2 have the same dimensions in the stretching direction. In the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34, the dimensions of the region R in the stretching direction are the same.
Note that the dimensions in the stretching direction of the first region R1 and the second region R2 may be different from each other. Furthermore, the farther the flux barrier portion 30 is located on the outer side in the radial direction of each flux barrier portion 30, the shorter or longer the dimensions of the first region R1 and the second region R2 in the stretching direction may be.

(Annular conductive part 50)
When viewed in the axial direction, the annular conductive portion 50 overlaps each conductor 40 in the flux barrier portion 30 at least in part.
More specifically, as shown in FIGS. 4A and 4B, when viewed from the axial direction, half of the outer diameter of the rotor core 20 is Ror, half of the outer diameter of the annular conductive portion 50 is Roer, and conductive is conducted inside from the central axis J. When Rocb is the shortest distance to the second flux barrier section 32 disposed at the outermost position in the radial direction among the flux barrier sections 30 in which the body 40 is disposed, Rocb<Roer<Ror is satisfied.
In order to satisfy Rocb<Roer, all of the conductors 40 disposed within the flux barrier section 30 are electrically connected by the annular conductive section 50. That is, the conductors 40 can be electrically short-circuited.
Here, the smaller the copper loss in the annular conductive portion 50 when the conductors 40 are electrically short-circuited, the more efficient the rotating electric machine 1 is when rotating the rotor 10. For example, in the conventional rotor 100 shown in FIG. 11, the rotor core 200 and the annular conductive portion 500 have the same outer diameter. Compared to the rotor 100 shown in FIG. 11, in this embodiment, since Roer<Ror is satisfied, the length of the outer periphery of the annular conductive portion 50 can be shortened. Therefore, the distance in the circumferential direction connecting the conductors 40 to each other by the annular conductive portion 50 is shortened, and copper loss can be reduced.

Further, in this embodiment, the conductor 40 is not arranged within the first flux barrier section 31. Therefore, when Re is the shortest distance from the central axis J to the first flux barrier section 31, which is the innermost part of the flux barrier section 30 in the radial direction and in which no conductor 40 is disposed, Rocb <Roer≦Re is satisfied.
Thereby, the length of the outer periphery of the annular conductive portion 50 can be shortened, so that the distance in the circumferential direction connecting each conductor 40 by the annular conductive portion 50 is shortened, and copper loss can be reduced.

The annular conductive part 50 is provided with an inner hole 51 that penetrates the annular conductive part 50 in the axial direction about the central axis J. The inner hole has a circular shape when viewed from the axial direction. The diameter of the inner hole 51 becomes the inner diameter of the annular conductive portion 50.
When viewed from the axial direction, when Rier is half the inner diameter of the annular conductive portion 50 and Rs is half the inner diameter of the through hole 20a, Rs≦Rier<Rocb is satisfied.
Thereby, the width W in the radial direction of the annular conductive portion 50 can be ensured, so that the copper loss of the annular conductive portion 50 can be reduced. Further, since the inner hole 51 of the annular conductive portion 50 has a circular shape when viewed from the axial direction, the width W in the radial direction is uniform in the circumferential direction. For example, in the rotor 100 shown in FIG. 11, the magnet 60 disposed on the straight portion 30a of the flux barrier portion 30 when viewed from the axial direction is exposed from the opening 501 of the annular conductive portion 500. Therefore, in the circumferential direction, the radial width of the annular conductive portion 500 becomes narrower at the location where the magnet 60 is arranged, and the electrical resistance becomes higher in this range. In contrast, in the present embodiment, the radial width W of the annular conductive portion 50 is uniform in the circumferential direction, and the electrical resistance when connecting the conductors 40 to each other can be suppressed.

Further, in this embodiment, when viewed from the axial direction, the shortest distance from the central axis J to the fourth flux barrier section 34 disposed innermost in the radial direction of the flux barrier section 30 in which the conductor 40 is disposed. When the distance is Ricb, Rier≦Ricb≦Rocb is satisfied. Thereby, the width W in the radial direction of the annular conductive portion 50 can be secured, so that the copper loss of the annular conductive portion 50 can be reduced.

As shown in FIGS. 2 and 3, the annular conductive portion 50 is located at a different position from the region R when viewed from the axial direction. When viewed from the axial direction, the annular conductive portion 50 is disposed radially inside the region R.
Therefore, the distance in the circumferential direction connecting the respective conductors 40 by the annular conductive portion 50 is shortened, and the copper loss of the rotor 10 can be reduced.

The shortest distance from the central axis J to the region R located innermost in the radial direction among the regions R is defined as Rir. In this embodiment, Rir is the shortest distance from the central axis J to the region R of the fourth flux barrier section 34. In this embodiment, Roer, which is half the outer diameter of the annular conductive portion 50, is equal to or greater than the shortest distance Rir. That is, Roer≦Rir is satisfied. Thereby, the region R and the annular conductive portion 50 do not overlap when viewed from the axial direction, and each conductor 40 can be electrically connected to the annular conductive portion 50.

The farthest distance from the central axis J to the region R is Rofr. In this embodiment, the radial positions of the radially outer ends of the region R are the same, so that from the central axis J to the end 30f of the flux barrier section 30 in the extending direction, It can also be said to be the farthest distance. Roer, which is half the outer diameter of the annular conductive portion 50, is smaller than the distance Rofr. That is, Roer<Rofr is satisfied. Thereby, each conductor 40 can be electrically connected to the annular conductive part 50 while preventing at least a portion of the region R from overlapping with the annular conductive part 50.

Note that an annular conductive portion 50 as shown in FIG. 5 may be employed. In the annular conductive portion 50 shown in FIG. 5, the inner hole 51 is provided at a position intersecting the flux barrier portion 30 when viewed in the axial direction. That is, when viewed from the axial direction, a part of the flux barrier section 30 is provided radially inside the inner hole 51, and Ricb≦Rier is satisfied. Also in this case, since the radial width W of the annular conductive portion 50 can be made uniform in the circumferential direction, the electrical resistance when connecting the conductors 40 to each other can be suppressed.

(Magnet 60)
As shown in FIG. 3, the magnet 60 is arranged at the first end 30f1 and the second end 30f2 of the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34. More specifically, the magnet 60 is arranged in the first region R1 and the second region R2 where the conductor 40 is not arranged. The magnet 60 is not arranged in the first flux barrier section 31 .

The magnet 60 has a rectangular shape extending along the extending direction of the region R when viewed in the axial direction. Since the region R extends linearly in the stretching direction, the rectangular magnet 60 can be easily arranged.
The dimension of the magnet 60 in the stretching direction is equal to or less than the dimension of the region R in the stretching direction, and the magnets 60 disposed in the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34 are each The dimensions in the stretching direction are the same. Note that the dimension in the extending direction of the magnet 60 may be shorter or longer as the magnet 60 is disposed in the flux barrier section 30 located on the outer side in the radial direction.
Both sides of the magnet 60 in the width direction are in contact with the first edge 30e1 and the second edge 30e2 of the flux barrier section 30, respectively.

The end of the magnet 60 in the stretching direction on the side closer to the q-axis is in contact with the conductor 40 .
A part of the end of the magnet 60 in the stretching direction on the side far from the q-axis is in contact with the end surface of the flux barrier section 30 in the stretching direction, or is provided apart from the end surface of the flux barrier section 30 in the stretching direction. There is. That is, in the stretching direction, a gap is provided between the stretching direction end of the magnet 60 on the side far from the q-axis and the end face of the flux barrier section 30 in the stretching direction.
More specifically, when viewed in the axial direction, the end face of the flux barrier section 30 in the extending direction extends along the outer peripheral surface of the rotor 10 and is not perpendicular to the extending direction of the flux barrier section 30. Therefore, when the end face of the flux barrier section 30 in the stretching direction and a part of the rectangular magnet 60 are in contact with each other, a triangular void is provided when viewed in the axial direction. Furthermore, when the end face of the flux barrier section 30 in the stretching direction and the rectangular magnet 60 are provided apart from each other, a trapezoidal gap is provided when viewed in the axial direction.

Note that the shape of the magnet 60 may be similar to the shape of the region R when viewed from the axial direction. Alternatively, the end face of the flux barrier section 30 in the stretching direction may be perpendicular to the stretching direction of the flux barrier section 30. In this case, the magnet 60 contacts the entire inner peripheral surface of the region R when viewed from the axial direction.

When viewed from the axial direction, the magnet 60 is arranged at a different position from the annular conductive part 50. Thereby, the outer diameter of the annular conductive portion 50 can be reduced, so that the conductors 40 can be efficiently short-circuited while reducing copper loss in the rotor 10. Moreover, since the magnet 60 is not covered with the annular conductive part 50 when viewed from the axial direction, the magnet 60 can be inserted into the region R after the conductor 40 and the annular conductive part 50 are made, for example. In this case, demagnetization of the magnet 60 due to the heat of the heated metal serving as the conductor 40 can be prevented.

<Direction of magnetic poles of magnet 60>
The magnetic poles of the magnet 60 are arranged along the circumferential direction.
In the first flux barrier group 130A and the third flux barrier group 130C, the magnet 60 provided in the first region R1 is referred to as the first magnet 61b, and the magnet 60 provided in the second region R2 is referred to as the second magnet 61c. call.
In the first magnet 61b and the second magnet 61c, which are arranged between the radially adjacent magnetic pole intermediate part M and the magnetic pole part P, the magnetic pole part P side is the N pole in the circumferential direction, and the magnetic pole The middle part M side is the S pole. In FIG. 3, in the flux barrier unit groups 130A and 130C, the magnetic pole directions of the three first magnets 61b and the three second magnets 61c arranged at intervals in the circumferential direction are indicated by arrows B11 and B12, respectively. Shown.

In the second flux barrier group 130B and the fourth flux barrier group 130D, the magnet 60 provided in the first region R1 is referred to as the first magnet 62b, and the magnet 60 provided in the second region R2 is referred to as the second magnet 62c. call.
In the first magnet 62b and the second magnet 62c, which are arranged between the magnetic pole part P and the magnetic pole intermediate part M that are adjacent to each other in the radial direction, the magnetic pole part P side is the S pole in the circumferential direction, and the magnetic pole The middle part M side is the north pole. In FIG. 3, the directions of the magnetic poles of the three first magnets 62b and the three second magnets 62c arranged at intervals in the circumferential direction in the flux barrier unit groups 130B and 130D are indicated by arrows B21 and B22, respectively. It shows.

In this way, in the flux barrier section groups 130 that are adjacent to each other in the circumferential direction, the magnetic pole directions of the magnets 60 are opposite to each other.

As shown in FIG. 3, three second magnets 62c are arranged on the -θ side, sandwiching the magnetic pole part P between the fourth flux barrier part group 130D and the first flux barrier part group 130A, and three second magnets 62c are arranged on the +θ side. Three first magnets 61b are arranged. The six magnets 62c and 61b are arranged on the outer peripheral edge of the rotor 10 at intervals in the circumferential direction. Among the six magnets 60, the magnetic pole direction B22 of the second magnet 62c and the magnetic pole direction B11 of the first magnet 61b are the same.
Similarly, the magnetic pole directions of the six magnets 62c and 61b placed across the magnetic pole part P between the second flux barrier group 130B and the third flux barrier group 130C are B22 and B11, respectively. are the same as each other.

Further, three second magnets 61c are arranged on the -θ side, and three second magnets 61c are arranged on the +θ side, sandwiching the magnetic pole part P between the first flux barrier part group 130A and the second flux barrier part group 130B. 1 magnet 62b is arranged. The six magnets 61c and 62b are arranged on the outer peripheral edge of the rotor 10 at intervals in the circumferential direction. Among the six magnets 60, the magnetic pole direction B12 of the second magnet 61c and the magnetic pole direction B21 of the first magnet 62b are the same.
Similarly, the magnetic pole directions of the six magnets 61c and 62b placed across the magnetic pole part P between the third flux barrier part group 130C and the fourth flux barrier part group 130D are also the magnetic pole directions B12 and B21, respectively. are the same as each other.

In this way, the six magnets 60 arranged between the first flux barrier parts 31 adjacent to each other in the circumferential direction have the same magnetic pole direction. Moreover, the directions of the magnetic poles of the six circumferentially adjacent magnets 60 are reversed in the circumferential direction.

<Improvement of torque of rotating electric machine 1 by magnet torque>
In this embodiment, the magnet 60 is arranged as described above within the flux barrier section 30 that generates reluctance torque. Thereby, both the reluctance torque generated by the magnetic anisotropy of the rotor 10 and the magnetic torque generated in the rotor 10 by the magnetic force of the magnet 60 can be suitably utilized, so that the torque of the rotating electric machine 1 can be improved.
For example, in a conventional rotor 100 shown in FIG. 11, a magnet 60 is disposed within a straight portion 30a of a flux barrier portion 30. Further, as shown by an arrow C1 in FIG. 11, the magnetic flux generated by the magnet 60 flows in a direction perpendicular to the extending direction of the straight portion 30a. In this case, the arrow C1, through which the magnetic flux of the magnet 60 passes, extends in a direction different from the d-axis, through which the magnetic flux of the synchronous reluctance motor easily passes. Furthermore, in the configuration of the rotor 100 shown in FIG. 11, in the relationship between the load angle of the rotating electric machine, reluctance torque, and magnet torque, the load angle at which the reluctance torque is the minimum and the load angle at which the magnet torque is the minimum are different. It becomes an angle. For this reason, the composite torque of the reluctance torque and the magnet torque may not be sufficiently improved.

On the other hand, in the rotor 10 of the present embodiment, a plurality of magnets 60 are arranged in parallel in the circumferential direction with the d-axis through which the magnetic flux of the synchronous reluctance motor easily passes. Further, the magnetic poles of the plurality of magnets 60 are arranged along the circumferential direction. With this configuration, in the relationship between the load angle of the rotating electrical machine 1 and the reluctance torque and magnet torque, the load angle at which the reluctance torque is the minimum and the load angle at which the magnet torque is the minimum can be matched. Furthermore, the load angle at which the reluctance torque is maximum and the load angle at which the magnet torque is maximum can be made to match.
In this way, in the rotor 10 of the present embodiment, the composite torque of the reluctance torque and the magnet torque can be suitably improved, so that the torque of the rotating electric machine 1 can be suitably improved.

Further, when viewed from the axial direction, the magnet 60 is disposed radially outward from the annular conductive portion 50. As a result, the magnet 60 can be disposed on the outer peripheral edge of the rotor core 20 in the circumferential direction, so that the composite torque of the reluctance torque and the magnet torque can be suitably improved as described above, and the outer diameter of the annular conductive portion 50 can be reduced. By making it smaller, copper loss can be reduced.
Moreover, since the plurality of magnets 60 are arranged at intervals in the circumferential direction, the magnetic path MP of the rotor core 20 can be secured between the magnets 60.

As explained above, the rotor 10 of this embodiment is a rotor 10 that is rotatable around the central axis J, and includes a rotor core 20 and annular conductive parts 50 arranged on both sides of the rotor core 20 in the axial direction. The rotor core 20 is provided with a plurality of flux barrier section groups 130 arranged at intervals in the circumferential direction, and the plurality of flux barrier section groups 130 include a plurality of flux barrier sections arranged in a line in the radial direction. 30, each of the plurality of flux barrier parts 30 has a shape convex inward in the radial direction when viewed from the axial direction, and at least one of the plurality of flux barrier parts 30 of each flux barrier part group 130 A conductor 40 electrically connected to the annular conductive part 50 is disposed inside the barrier part 30, and when viewed from the axial direction, half of the outer diameter of the rotor core 20 is Ror, and half of the outer diameter of the annular conductive part 50 is Ror. When half is Roer and the shortest distance from the central axis J to the flux barrier section 30 that is disposed at the outermost position in the radial direction among the flux barrier sections 30 in which the conductor 40 is disposed inside is Rocb, Rocb< Satisfies Roer<Ror.

Thereby, the outer diameter of the annular conductive portion 50 can be made smaller than the outer diameter of the rotor core 20, and the copper loss of the rotor 10 can be reduced. Therefore, efficiency and torque can be improved during normal rotation when the rotor 10 rotates at the rated speed.
Further, since the copper loss of the rotor 10 can be reduced without increasing the axial thickness of the annular conductive portion 50, the axial dimension of the rotating electric machine 1 can be made compact.
Furthermore, since the rotor 10 of this embodiment can be manufactured using the same manufacturing process as the conventional rotor 100 having the annular conductive portion 500 as shown in FIG. It becomes possible to obtain a rotor 10 with exceptional effects.

Further, the flux barrier section 30 in which the conductor 40 is disposed is a flux barrier section 30 disposed radially inward from the first flux barrier section 31 located at the radially outermost position in the flux barrier section group 130. It is. Thereby, the outer diameter of the annular conductive portion 50 can be made smaller, so that copper loss in the annular conductive portion 50 can be further reduced.

Furthermore, when viewed from the axial direction, the conductor 40 is disposed away from both ends 30f in the stretching direction of the flux barrier section 30 where the conductor 40 is disposed. Thereby, for example, the magnet 60 can be placed in the region R where the conductor 40 is not placed. Further, the region R may be a gap without the magnet 60, or it is also possible to arrange a structure other than the magnet. In this way, by arranging the conductor 40 apart from the end portion 30f, it is possible to obtain a rotor 10 that can be adapted to various designs.

Further, the rotating electrical machine 1 of the present embodiment includes the above-described rotor 10 and the stator 3 located on the outside of the rotor 10 in the radial direction.
This makes it possible to obtain the rotating electric machine 1 that can improve efficiency and torque during normal rotation when the rotor 10 rotates at the rated speed.

(Second embodiment)
Next, a second embodiment according to the present invention will be described, which has the same basic configuration as the first embodiment. Therefore, similar configurations will be given the same reference numerals and their explanations will be omitted, and only the different points will be explained.
As shown in FIG. 6, compared to the first embodiment, the rotor 10 of the present embodiment has a second end 30f2 of the second flux barrier section 32, the third flux barrier section 33, and the fourth flux barrier section 34. The conductor 40 is arranged, and the second region R2 is not provided. Further, the magnet 60 is not provided at the second end portion 30f2.
In the rotor 10 of this embodiment, the dimension in the stretching direction of the first region R1 is longer than that in the first embodiment, and the dimension in the stretching direction of the magnet 60 arranged in the first region R1 is also longer than that in the first embodiment. It is longer than.

In this embodiment, in the flux barrier group 130, the magnetic torque can be suitably used on the −θ side with respect to the q-axis. Therefore, the efficiency and torque when rotating the rotor 10 in the -θ direction can be improved. Furthermore, the current flowing through the stator 3 during normal operation in which the rotor 10 rotates in the −θ direction at the rated speed can be reduced.
Furthermore, compared to the first embodiment, the relationship between the direction of the magnetic flux generated by the stator 3 and the direction of the magnetic flux of the magnet 60 makes demagnetization of the magnet 60 arranged in the rotor 10 less likely to occur.

(Third embodiment)
Next, a third embodiment according to the present invention will be described, which has the same basic configuration as the first embodiment. Therefore, similar configurations will be given the same reference numerals and their explanations will be omitted, and only the different points will be explained.
As shown in FIG. 7, compared to the first embodiment, in the rotor 10 of this embodiment, the directions of the magnetic poles of the first magnets 61b and 62b of the four flux barrier section groups 130 are reversed in the circumferential direction.
That is, among the six magnets 60 arranged across the magnetic pole part P between the fourth flux barrier part group 130D and the first flux barrier part group 130A, the magnetic pole direction B22 of the second magnet 62c and the first The magnetic pole direction B11 of the magnet 61b faces in a direction that faces each other in the circumferential direction.
Similarly, the magnetic pole directions of the six magnets 62c and 61b placed across the magnetic pole part P between the second flux barrier group 130B and the third flux barrier group 130C are B22 and B11, respectively. are facing in directions opposite to each other in the circumferential direction.

Moreover, among the six magnets 60 arranged across the magnetic pole part P between the first flux barrier part group 130A and the second flux barrier part group 130B, the magnetic pole direction B12 of the second magnet 61c and the first The magnetic pole direction B21 of the magnet 62b faces in a direction opposite to each other in the circumferential direction.
Similarly, the magnetic pole directions of the six magnets 61c and 62b placed across the magnetic pole part P between the third flux barrier part group 130C and the fourth flux barrier part group 130D are also the magnetic pole directions B12 and B21, respectively. are facing in directions opposite to each other in the circumferential direction.

Thereby, the efficiency and torque when rotating the rotor 10 can be improved. Furthermore, the current flowing through the stator 3 during normal operation when the rotor 10 rotates at the rated speed can be reduced.
Furthermore, compared to the first embodiment, the relationship between the direction of the magnetic flux generated by the stator 3 and the direction of the magnetic flux of the magnet 60 makes demagnetization of the magnet 60 arranged in the rotor 10 less likely to occur.

(Fourth embodiment)
Next, a fourth embodiment according to the present invention will be described, but the basic configuration is the same as that of the first embodiment and the second embodiment. Therefore, similar configurations will be given the same reference numerals and their explanations will be omitted, and only the different points will be explained.
As shown in FIG. 8, compared to the second embodiment, the rotor core 20 does not have a magnetic path MP located outside the first flux barrier section 31 in the radial direction. That is, the first flux barrier section 31 is open to the outer peripheral surface of the rotor core 20.
Thereby, the efficiency and torque when rotating the rotor 10 can be improved. Furthermore, the current flowing through the stator 3 during normal operation when the rotor 10 rotates at the rated speed can be reduced.
Furthermore, compared to the first embodiment, the relationship between the direction of the magnetic flux generated by the stator 3 and the direction of the magnetic flux of the magnet 60 makes demagnetization of the magnet 60 arranged in the rotor 10 less likely to occur.

Hereinafter, the above embodiment will be described using specific examples. Note that the present invention is not limited to the following examples.

In a rotating electric machine having a rotor in which the arrangement of the magnets 60 and the shape of the flux barrier section 30 are different, copper loss in the rotor, operating current of the stator during normal rotation of the rotor, maximum torque that allows synchronous rotation of the rotor, and The torque at startup was compared.
In the following description, the rotor of Example 1 is the rotor 10 of the first embodiment shown in FIG. 5, the rotor of Example 2 is the rotor 10 of the second embodiment shown in FIG. 6, and the rotor of Example 3 is the rotor 10 of the first embodiment shown in FIG. is the rotor 10 of the third embodiment shown in FIG. 7, the rotor of Example 4 is the rotor 10 of the fourth embodiment shown in FIG. 8, and the rotor of Comparative Example 1 is the rotor 100 shown in FIG. 11. . Note that the Roer and Rier of the annular conductive portion 50 of Examples 1 to 4 are equivalent to each other.

<Rotor copper loss>
Compared to Comparative Example 1, the copper loss of the rotor 10 of Examples 1 to 4 was lower. This is because the outer diameter of the annular conductive portion 50 of Examples 1 to 4 was smaller than that of the annular conductive portion 500 of Comparative Example 1. For example, the copper loss of the rotor of Example 1 was about half that of Comparative Example 1.
Among Examples 1 to 4, in Example 2, the copper loss of the rotor 10 was greater than in Examples 1, 3, and 4. The reason why the copper loss of Example 2 is larger than that of Examples 1 and 4 is considered to be that in Example 2, the conductor 40 is disposed at the second end 30f2. In Example 2, the conductor 40 was arranged up to the outer peripheral edge of the rotor 10, and the magnetic flux generated by the stator 3 effectively flowed through the conductor 40. Therefore, in Example 2, due to electromagnetic induction in the conductor 40 disposed at the outer peripheral edge of the rotor 10, a larger induced current was generated than in Examples 1 and 3, resulting in larger copper loss.

In the fourth embodiment, the conductor 40 is arranged at the outer peripheral edge of the rotor 10 as in the second embodiment, but the copper loss of the rotor 10 in the fourth embodiment is smaller than in the first, second and third embodiments. Ta. This is considered to be because in Example 4, the first flux barrier section 31 is open, which increases the anisotropy of reluctance and reduces the induced current caused by electromagnetic induction.
Note that the copper loss of the rotor of Example 2 was larger than that of Examples 1, 3, and 4, but lower than that of Comparative Example 1. This is considered to be an effect due to the fact that the outer diameter of the annular conductive portion 50 of Comparative Example 2 is smaller than that of Comparative Example 1.

<Rated operating current>
In Examples 1 to 4, compared to Comparative Example 1, the rated operating current, which is the operating current of the stator during normal rotation of the rotor, was equal to or lower than that of Comparative Example 1. In particular, in Examples 2, 3, and 4, compared to Comparative Example 1, the operating current of the stator during normal rotation of the rotor 10 was suitably reduced. This is because by arranging the magnet 60 at the outer peripheral edge of the rotor core 20, the composite torque of the reluctance torque and the magnet torque can be suitably improved. This shows that in Examples 1 to 4, the efficiency of the rotating electric machine 1 can be improved.

<Maximum synchronous torque of rotor>
In Examples 1 to 4, compared to Comparative Example 1, the maximum torque that allows the rotor to rotate synchronously was equal to or higher than that of Comparative Example 1. In particular, in Examples 2, 3, and 4, there was a large improvement in the maximum motive torque. This is considered to be because, as described above, the composite torque was suitably improved in Examples 1 to 4.

<Performance at rotor startup>
In Examples 1 to 4, the performance at startup was sometimes inferior to Comparative Example 1. This is considered to be because in Examples 1 to 4, the amount of conductors 40 disposed at the outer peripheral edge of the rotor 10 is smaller than in Comparative Example 1, so that the Lorentz force generated at the time of startup becomes smaller.
Here, the performance of the rotor at startup can be improved by using a known configuration for controlling the rotation of the rotor at startup. A configuration for controlling the rotation of the rotor during startup includes a VF drive (Variable-Frequency drive) and the like. For example, in Examples 1 to 4, by using the VF drive, it is possible to improve the performance of the rotor 10 at startup, and also to significantly increase the efficiency compared to Comparative Example 1 during normal rotation at the rated speed.

The present invention is not limited to the above-described embodiments, and other configurations may be adopted within the scope of the technical idea of the present invention.

For example, in the rotor 10 shown in FIG. 6, the magnet 60 is disposed only in the first region R1 disposed at the first end 30f1, but the magnet 60 is not limited to this example.
For example, the magnet 60 may be disposed only in the second region R2 disposed at the second end 30f2, and the magnet 60 may not be disposed at the first end 30f1. This makes it possible to increase the efficiency when rotating toward the +θ side.

Furthermore, the number of flux barrier sections 30 that each flux barrier section group 130 has is not limited to four, but only two flux barrier sections 30 may be included. For example, the number of flux barrier sections 30 included in each flux barrier section group 130 may be two, three, or four or more.
For example, in the rotor core 20 shown in FIG. 9, the number of flux barrier sections 30 included in each flux barrier section group 130 is three.

Further, in the rotor 10 shown in FIG. 3, the number of flux barrier sections 30 in which the conductor 40 is not disposed among the flux barrier section group 130 is only one, but the number may be two or more. Further, the flux barrier section 30 in which the conductor 40 is not arranged may not be provided.
For example, as shown in FIG. 9, the conductor 40 may be disposed in the first flux barrier section 31 that is the outermost part in the radial direction. In the rotor 10 shown in FIG. 9, conductors 40 are disposed in at least a portion of all the flux barrier sections 30, and the conductors 40 are electrically connected to each other by an annular conductive section 50 having dimensions that satisfy Rocb<Roer<Ror. Connected. Note that among the flux barrier parts 30 in which the conductor 40 is arranged, the outermost flux barrier part in the radial direction is the first flux barrier part 31, so the shortest distance Rocb is from the center axis J to the first flux barrier part 31. This is the shortest distance to the flux barrier section 31.
As a result, the amount of conductors 40 disposed in the flux barrier section 30 increases, so a larger Lorentz force can be obtained, and the performance at startup can be improved.

Further, as in the rotor 10 shown in FIG. 9, regions R may be provided at both ends 30f of the first flux barrier section 31 where the conductor 40 is arranged, and the magnet 60 may be arranged. Note that in the rotor 10 shown in FIG. 9, the region R and the magnet 60 may not be arranged in the first flux barrier section 31, and the inside of the first flux barrier section 31 may be filled with the conductor 40 without any voids.

Further, the number of magnetic pole parts P of the rotor core 20 is not limited to four poles, and may be less than four poles or more than four poles. The number of magnetic pole parts P of the rotor 10 may be, for example, two poles, six poles, or eight poles.
FIG. 9 shows a rotor 10 having a six-pole structure. The six flux barrier unit groups 130 are arranged at equal intervals along the circumferential direction of the rotor 10. Since the magnetic pole portions P are provided between the flux barrier portion groups 130 adjacent to each other in the circumferential direction, six magnetic pole portions P are provided in the rotor 10 shown in FIG. 5 .

Furthermore, in the rotor 10 shown in FIG. 3, in the flux barrier section group 130, the first flux barrier section 31 is not provided with the bridge section 30g, and each of the other flux barrier sections 30 is provided with one bridge section 30g. However, it is not limited to this example.
For example, the first flux barrier section 31 may be provided with a bridge section 30g. The bridge portion 30g may be provided in only one of the second flux barrier portion 32, the third flux barrier portion 33, and the fourth flux barrier portion 34. The number of bridge parts 30g provided in each flux barrier part 30 is not limited to one, but may be two or more. Further, the bridge portion 30g may be arranged at a position other than on the q-axis.
In addition, in each flux barrier part 30, it is preferable to adjust the dimensions of the annular conductive part 50 so that the conductors 40 separated by the bridge part 30g are electrically connected to the annular conductive part 50, respectively.

Further, as shown in FIG. 9, the bridge portion 30g may not be provided in the flux barrier portion 30.
For example, if the conductor 40 is electrically separated by the bridge portion 30g, the Lorentz force generated in the rotor 10 may not be obtained appropriately. By not providing the bridge portion 30g, it becomes possible to suitably obtain the Lorentz force. In particular, in the flux barrier section group 130, by not providing the bridge section 30g in the flux barrier section 30 located on the outside in the radial direction, it becomes possible to obtain the Lorentz force more suitably.

Further, in the rotor 10 shown in FIG. 3, the shape of the plurality of flux barrier parts 30 is a polygonal line shape that is convex radially inward when viewed in the axial direction, but is not limited to this example. It may be an arcuate shape that is convex inward in the radial direction when viewed. Furthermore, one flux barrier section group 130 may include both arc-shaped flux barrier sections 30 and polygonal line-shaped flux barrier sections 30. Furthermore, the flux barrier section 30 may extend linearly in the stretching direction only at least in the portion where the magnet 60 is arranged.

Further, the rotor 10 does not need to include the magnet 60 located inside the flux barrier section 30. For example, the magnet 60 may not be arranged in the region R, and the region R may be a gap.

Further, the position where the magnet 60 is arranged is not limited to the end portion 30f of the flux barrier section 30. For example, as shown in FIG. 10, a magnet 60 may be provided within the straight portion 30a of the flux barrier section 30 other than the first flux barrier section 31. In the rotor 10 shown in FIG. 10, two magnets 60 are arranged with a bridge portion 30g provided at a position overlapping with the q-axis sandwiched therebetween. The magnetic poles of the magnet 60 are oriented in the radial direction or the extending direction.
In this case as well, the copper loss of the rotor 10 can be reduced by reducing the outer diameter of the annular conductive portion 50 while increasing the torque of the rotor 10 due to the magnetic force of the magnet.

In the rotor 10 shown in FIG. 3, both sides of the magnet 60 in the width direction are in contact with the first edge 30e1 and the second edge 30e2 of the flux barrier section 30, respectively, when viewed in the axial direction. Not limited to. The conductor 40 may be arranged between the side surface of the magnet 60 in the width direction and the edges 30e1 and 30e2 of the flux barrier section 30.
For example, the position of the magnet 60 may be fixed by placing the magnet 60 inside the flux barrier section 30 and then filling the flux barrier section 30 with the molten conductor 40.

Furthermore, the flux barrier section 30 does not have to penetrate the rotor core 20 in the axial direction. The flux barrier section 30 may be open at the end surface of the rotor core 20 in the axial direction.

The flux barrier section 30 is not particularly limited as long as it can suppress the flow of magnetic flux. In the above-described embodiment, the conductor 40 is disposed at a position other than the region R within the flux barrier section 30, but a part of the flux barrier section 30 where the conductor 40 is disposed may be a void. Further, the flux barrier section 30 may be configured by embedding a non-magnetic material such as resin in the gap.

The use of the rotating electric machine to which the present invention is applied 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 configurations described above in this specification can be combined as appropriate within a mutually consistent range.

DESCRIPTION OF SYMBOLS 1... Rotating electrical machine, 3... Stator, 10... Rotor, 20... Rotor core, 20a... Through hole, 30... Flux barrier part, 30e1... First edge part, 30e2... Second edge part, 30f... Extension direction of flux barrier part 30g...Bridge part, 40...Conductor, 50...Annular conductive part, 60...Magnet, 130...Flux barrier group, J...Central axis line

Claims (8)

1. A rotor rotatable around a central axis,
   rotor core and
   annular conductive parts disposed on both sides of the rotor core in the axial direction;
   Equipped with
   The rotor core is provided with a plurality of flux barrier portion groups arranged at intervals in the circumferential direction,
   Each of the plurality of flux barrier section groups includes a plurality of flux barrier sections arranged in a line in the radial direction,
   The plurality of flux barrier parts have a shape convex inward in the radial direction when viewed from the axial direction, and at least one of the plurality of flux barrier parts of each flux barrier part group has a , a conductor electrically connected to the annular conductive part is arranged,
   Viewed from the axial direction,
   Half the outer diameter of the rotor core is Ror,
   Half of the outer diameter of the annular conductive part is Roer,
   When Rocb is the shortest distance from the central axis to the flux barrier part disposed most outwardly in the radial direction among the flux barrier parts in which the conductor is disposed,
   A rotor that satisfies Rocb<Roer<Ror.
2. The rotor core has a through hole that passes through the rotor core in the axial direction,
   The central axis passes through the through hole,
   Viewed from the axial direction,
   Half of the inner diameter of the annular conductive part is set as Rier,
   When half of the inner diameter of the through hole is Rs,
   The rotor according to claim 1, satisfying Rs≦Rier<Rocb.
3. comprising a magnet located within the flux barrier section,
   The rotor according to claim 1 or 2, wherein the magnet is located at a different position from the annular conductive portion when viewed from the axial direction.
4. The rotor according to claim 3, wherein the magnet is disposed radially outward from the annular conductive portion when viewed from the axial direction.
5. In the flux barrier part group, at least one of the flux barrier parts other than the flux barrier part located at the radially outermost position has a first edge on the inner side in the radial direction and a first edge on the outer side in the radial direction of the flux barrier part. The rotor according to any one of claims 1 to 4, further comprising a bridge portion connecting the two edges.
6. The flux barrier section in which the conductor is disposed is the flux barrier section disposed radially inward from the flux barrier section located radially outermost in the flux barrier section group. The rotor according to any one of items 1 to 5.
7. The rotor according to any one of claims 1 to 6, wherein the electric conductor is disposed apart from both ends in the stretching direction of the flux barrier section in which the electric conductor is disposed, when viewed from the axial direction. .
8. A rotor according to any one of claims 1 to 7,
   a stator located on the radially outer side of the rotor;
   A rotating electric machine equipped with

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