TW201828575A - Rotor and rotary electric machine - Google Patents

Abstract

Rotor (2) has a rotor core (3), a plurality of magnet insertion holes (6), a plurality of permanent magnets (5) of which each one is respectively inserted in the magnet insertion hole (6). The magnet insertion holes (6) are formed symmetrically in peripheral direction (D1) with respect to parallel magnetic pole center plan (SV). The permanent magnets (5) are disposed non-symmetrically in an axial direction (D2) and are also disposed non-symmetrically in a peripheral direction (D1) with respect to the magnet pole center plan (SV). The magnet pole center (71) is positioned on a line (9) that equally divides the width of an outer peripheral plan (31) of the magnet pole (7) in the peripheral direction.

Description

   Rotor and rotating electrical machine   

The invention relates to a rotor with a rotor core and a rotating electric machine.

As for a structure in which cogging torque is reduced in a buried-magnet-type rotating electrical machine in which a permanent magnet is embedded in a rotor core, a rotor of a stapped skew structure is known. However, due to the complicated rotor structure of the segment slope structure, there is a problem that the manufacturing time becomes longer and the productivity is low.

In the rotor core of the rotor disclosed in Patent Document 1, three magnet insertion holes are formed, and permanent magnets are inserted into each of the three magnet insertion holes. One magnetic pole is formed by three permanent magnets, and the three permanent magnets forming one magnetic pole are arranged in the circumferential direction with respect to the center of the magnetic pole in the circumferential direction of the rotor, and in the accumulation direction with respect to the center of the accumulation direction of the rotor core Symmetrically configured.

    [Prior Technical Literature]         [Patent Literature]    

Patent Document 1: Japanese Patent Laid-Open No. 2003-333778

However, the rotor disclosed in Patent Document 1 has a small slope angle between the permanent magnet disposed at the center of the magnetic pole in the circumferential direction and the permanent magnet adjacent to the permanent magnet. Each of the plurality of rotating iron cores in the axial direction deviates greatly in the circumferential direction, and a complicated manufacturing method of stacking can reduce the rotor of the cogging torque.

The present invention was developed in view of the above-mentioned problems, and its object is to obtain a rotor that can reduce cogging torque without complicating the structure.

In order to solve the above problems and achieve the objective, the rotor of the present invention includes: a rotor core, which forms a plurality of magnet insertion holes with respect to one magnetic pole; a permanent magnet, which is inserted into each of the plurality of magnet insertion holes; and includes a connecting rotor The line between the central axis of the iron core and the magnetic pole center of the magnetic pole is symmetrically formed in the circumferential direction with respect to the central surface of the magnetic pole parallel to the axial direction of the central axis, and passes through the center of the central axis The central plane of the axis direction orthogonal to the central plane of the magnetic pole, the permanent magnets are arranged in the axial direction in an asymmetric manner, and are arranged in the circumferential direction in an asymmetric manner with respect to the central plane of the magnetic pole. The width of the outer peripheral surface is given on the bisector.

The rotor of the invention can exert the effect of reducing cogging torque without complicating the structure.

1‧‧‧fixer

2‧‧‧Rotor

2A‧‧‧Rotor

2B‧‧‧Rotor

2C‧‧‧Rotor

2D‧‧‧Rotor

2E‧‧‧Rotor

2F‧‧‧Rotor

3‧‧‧Rotor core

3A‧‧‧Rotor core

3B‧‧‧Rotor core

3FB‧‧‧Gap

4‧‧‧axis

4VL‧‧‧ Opposite

5‧‧‧Permanent magnet

5Da‧‧‧Permanent magnet

5Db‧‧‧Permanent magnet

5Na‧‧‧Permanent magnet

5Nb‧‧‧Permanent magnet

5Ua‧‧‧Permanent magnet

5Ub‧‧‧Permanent magnet

5D‧‧‧2nd permanent magnet

5D1‧‧‧The second permanent magnet

5D2‧‧‧The second permanent magnet

5M‧‧‧The third permanent magnet

5N‧‧‧The third permanent magnet

5U‧‧‧First permanent magnet

5U1‧‧‧First permanent magnet

5U2‧‧‧First permanent magnet

5a‧‧‧End plate

5b‧‧‧End plate

6‧‧‧Magnet insertion hole

7‧‧‧ magnetic pole

8‧‧‧ line

9‧‧‧ line

31‧‧‧Perimeter

32‧‧‧One end

33‧‧‧The other end

34‧‧‧Axis center

61‧‧‧The first magnet insertion hole

61A‧‧‧First magnet insertion hole

61B‧‧‧First magnet insertion hole

62‧‧‧The second magnet insertion hole

62A‧‧‧Second magnet insertion hole

62B‧‧‧The second magnet insertion hole

63B‧‧‧The third magnet insertion hole

71‧‧‧Magnetic Center

72‧‧‧ Center

100‧‧‧rotating motor

100A‧‧‧rotating motor

AX‧‧‧Central axis

CL‧‧‧Interchange

D1‧‧‧Circumferential direction

D2‧‧‧Axis direction

D3‧‧‧direction

SH‧‧‧Axis center

SV‧‧‧Pole central plane

Fig. 1 is a vertical sectional view of a shaft of a rotating electric machine equipped with the rotor of the first embodiment.

FIG. 2 is a perspective view showing an arrangement of permanent magnets corresponding to one of the plurality of magnetic poles of the rotor shown in FIG. 1. FIG.

FIG. 3 is a view showing a state where the end plates of the rotor end faces of the rotor core shown in FIG. 2 are arranged.

Fig. 4 is a vertical cross-sectional view showing an arrangement state of permanent magnets corresponding to one of the plural magnetic poles of the rotor of the second embodiment.

FIG. 5 is a perspective view showing the configuration of the permanent magnet corresponding to the arrangement of one magnetic pole shown in FIG. 4. FIG.

FIG. 6 is a perspective view showing the arrangement of permanent magnets corresponding to one of the plural magnetic poles of the rotor of the third embodiment.

Fig. 7 is a diagram showing a first modification of the rotor of the first embodiment.

Fig. 8 is a diagram showing a second modification of the rotor of the first embodiment.

Fig. 9 is a diagram showing a modification of the rotor of the third embodiment.

Fig. 10 is a vertical cross-sectional view of a shaft of a rotating electric machine equipped with the rotor of the fourth embodiment.

Hereinafter, a rotor and a rotating electric machine according to embodiments of the present invention will be described in detail based on the drawings. In addition, this invention is not limited by this embodiment.

    Embodiment 1    

Fig. 1 is a vertical sectional view of a shaft of a rotating electric machine equipped with the rotor of the first embodiment. The rotating electric machine 100 shown in FIG. 1 includes a stator 1 and a rotor 2 provided inside the stator 1. The rotor 2 includes a rotor core 3, a shaft 4 provided on the rotor core 3, and a plurality of permanent magnets 5. Hereinafter, the axial direction of the central axis AX of the rotor core 3 is simply referred to as the “axial direction”, the radial direction of the rotor core 3 is simply referred to as the “radial direction”, and the circumferential direction of the rotor core 3 is simply referred to as the “circumferential direction” or direction".

The rotor core 3 is formed by laminating a plurality of thin plates in a ring shape through a ring-shaped electromagnetic steel base material, not shown, in the axial direction. A plurality of thin plates are fixed to each other in advance by welding or bonding. There is a gap between the rotor core 3 and the stator 1. The shaft 4 is fixed to the shaft portion of the rotor core 3 by burning, cold fitting or press-fitting.

A plurality of magnet insertion holes 6 are formed in the rotor core 3. Each of the plurality of magnet insertion holes 6 is arranged along the circumferential direction D1. The magnet insertion holes 6 adjacent to the circumferential direction D1 are spaced from each other.

The rotor 2 system includes 20 permanent magnets 5, and 10 magnetic poles 7 are formed on the rotor 2. One magnetic pole 7 is formed by a group of permanent magnets 5 inserted into each of two magnet insertion holes 6 adjacent to the circumferential direction D1. A plurality of groups of permanent magnets 5 are arranged along the circumferential direction D1 in such a manner that different polarities alternate with each other, and magnetize in such a way that the magnetization alignment direction becomes the radial direction.

FIG. 2 is a perspective view showing an arrangement of permanent magnets corresponding to one of the plurality of magnetic poles of the rotor shown in FIG. 1. FIG. As shown in FIG. 2, the permanent magnet 5 forming one magnetic pole 7 is composed of a first permanent magnet 5U and a second permanent magnet 5D.

A magnet insertion hole 6 is formed in the rotor core 3. The magnet insertion hole 6 is composed of a first magnet insertion hole 61 into which the first permanent magnet 5U is inserted, and a second magnet insertion hole 62 into which the second permanent magnet 5D is inserted.

Each of the first magnet insertion hole 61 and the second magnet insertion hole 62 is formed in a rectangular parallelepiped shape, and is formed at a position close to the outer peripheral surface 31 of the rotor core 3. Each of the first magnet insertion hole 61 and the second magnet insertion hole 62 penetrates from one end surface 32 of the rotor core 3 in the axial direction to the other end surface 33. The axis direction of the rotor core 3 is the direction indicated by the arrow D2 in FIG. 2. The first magnet insertion hole 61 and the second magnet insertion hole 62 are arranged adjacent to each other in the circumferential direction D1.

The first magnet insertion hole 61 and the second magnet insertion hole 62 are formed symmetrically with respect to the magnetic pole center plane SV. The magnetic pole center plane SV includes a line 8 connecting the central axis AX of the rotor core 3 and the magnetic pole center 71 of the rotor core 3 in the circumferential direction D1, and is a plane parallel to the axis direction D2 of the central axis AX. The magnetic pole center 71 is located on a line 9 that bisects the width of the outer circumferential surface 31 of the magnetic pole 7 in the circumferential direction D1.

The first permanent magnet 5U inserted into the first magnet insertion hole 61 is arranged close to one end surface 32 of the rotor core 3, and the second permanent magnet 5D inserted into the second magnet insertion hole 62 is arranged close to the rotor core 3 The position of the other end surface 33.

The width from one end surface 32 to the other end surface 33 of the rotor core 3 in the axial direction D2 is set to Lr, the width after the width Lr is halved is set to Lr / 2, and the first permanent magnet in the axial direction D2 When the width of 5U is Lmu and the width of the second permanent magnet 5D in the axial direction D2 is Lmd, each of the width Lmu and the width Lmd is equal to the width Lr / 2. In other words, the width Lr is equal to the length that doubles each of the width Lmu and the width Lmd.

In this way, the first permanent magnet 5U and the second permanent magnet 5D are arranged in the circumferential direction D1 so as to be asymmetric with respect to the magnetic pole center plane SV, and are perpendicular to the axial direction D2 with respect to the stacking direction of the rotor core 3 The axial center surface SH is arranged in the axial direction D2 so as to be asymmetric.

In addition, the 1st permanent magnet 5U and the 2nd permanent magnet 5D are arrange | positioned so that it may become point symmetry with respect to the intersection line CL of the magnetic pole center plane SV and the axial direction center plane SH. The axial center plane SH is a plane passing through the center 72 of the central axis AX of the rotor core 3 in the axial direction D2 and orthogonal to the magnetic pole central plane SV, and is a plane including the axial center 34. According to this configuration, the permanent magnets 5 can be arranged in a stepped shape, and the same slope effect with respect to any rotation direction of the rotor 2 can be obtained. Therefore, the cogging torque reduction with the same slope with respect to any rotation direction can be obtained. effect. Therefore, even if a complicated manufacturing method is adopted in which a plurality of rotating iron cores are shifted in the circumferential direction D1 and stacked, the cogging torque can be reduced with a simple structure.

In the rotor disclosed in the above Patent Document 1, since the permanent magnets are arranged symmetrically in the circumferential direction with respect to the center of the magnetic poles in the circumferential direction of the rotor, it is not possible to form one magnetic pole with a group of two permanent magnets. In contrast to this, the rotor 2 of the first embodiment is formed by two permanent magnets arranged at a slope to form a magnetic pole, and the segment slope angle is large. Therefore, compared with the rotor of Patent Document 1, the structure is simplified, and the manufacturing cost can be reduced. Can improve the cogging torque reduction effect.

Furthermore, according to the rotor 2 of the first embodiment, since the slope effect equivalent to any rotation direction can be obtained, the cogging torque reduction effect equivalent to any rotation direction can be obtained. Therefore, according to the rotor 2 of the first embodiment, it is possible to obtain a rotary electric machine 100 that is particularly suitable for products of servo motors and electric power steering.

Furthermore, in the rotor 2 of the first embodiment, the end face position of the first permanent magnet 5U in the axial direction D2 coincides with the position of one end face 32 of the rotor core 3, and the end face position of the second permanent magnet 5D in the axial direction D2 The position of the other end surface 33 of the rotor core 3 coincides. Furthermore, the position of the axial direction D2 of each of the first permanent magnet 5U and the second permanent magnet 5D can be inserted into the first magnet insertion hole 61 and the second magnet insertion hole 62 by pressing each permanent magnet It depends on each. Therefore, according to the rotor 2 of the first embodiment, the insertion process of the permanent magnet 5 is simplified, and the manufacturing cost can be reduced.

FIG. 3 is a view showing a state where end plates are arranged on the end surfaces of the rotor core shown in FIG. 2. In order to prevent the first permanent magnet 5U and the second permanent magnet 5D from protruding in the axial direction D2, as shown in FIG. 3, the rotor core 3 may be provided with an end plate 5a disposed on one end surface 32 and disposed on the other end surface 33.端 板 5b。 End plate 5b. In addition, in FIG. 3, although the end plates 5a and 5b are shaped to extend to the center of the rotor core 3 in the radial direction D3, if the end plates 5a and 5b are capable of preventing the first permanent magnet 5U and the second permanent magnet The prominent shape of 5D is not limited to the example shown in the figure. Furthermore, the end plates 5a and 5b may be provided with holes through which the fastening members are inserted, or through holes through which the shaft 4 shown in FIG. 1 may be provided.

Furthermore, each of the first permanent magnet 5U and the second permanent magnet 5D can be disposed asymmetrically with respect to the magnetic pole center plane SV, so the length in each axial direction may also be different.

Furthermore, in the present embodiment, the arrangement pattern of the plurality of permanent magnets 5 constituting each of the plurality of magnetic poles 7 formed in the rotor core 3 is identical for each magnetic pole 7. With this, the cogging torque can be most effectively reduced. However, even if the permanent magnet 5 forming one of the plurality of magnetic poles 7 is disposed asymmetrically with respect to the magnetic pole center plane SV, the cogging torque can be reduced.

In addition, when the magnetic pole 7 forming the N pole and the magnetic pole 7 forming the S pole are arranged symmetrically with respect to the interface between the magnetic poles, a structure in which the cogging torque is equally reduced with respect to any rotation direction may be adopted.

    Embodiment 2    

Fig. 4 is a vertical cross-sectional view showing an arrangement state of permanent magnets corresponding to one of the plural magnetic poles of the rotor of the second embodiment. Fig. 5 is a perspective view showing the configuration of the arrangement state of the permanent magnet corresponding to one magnetic pole shown in Fig. 4; In the rotor core 3A of the rotor 2A of the second embodiment, the first permanent magnet 5U of the two permanent magnets forming one magnetic pole 7 is inserted into the first magnet insertion hole 61A, and the second permanent magnet 5D is inserted into the second magnet Insert into the hole 62A.

Between the first permanent magnet 5U and the first magnet insertion hole 61A, a gap 3FB for preventing magnetic flux short-circuit is formed. Although not shown in FIG. 4, the same gap may be formed between the second permanent magnet 5D and the second magnet insertion hole 62A.

The first magnet insertion hole 61A and the second magnet insertion hole 62A are formed separated from each other in the circumferential direction D1, and are formed symmetrically with respect to the magnetic pole center plane SV. The first magnet insertion hole 61A and the second magnet insertion hole 62A are formed so that the distance between the opposing surfaces 4VL extends from the central axis AX toward the outer peripheral surface 31 of the rotor core 3A. In other words, the first magnet insertion hole 61A and the second magnet insertion hole 62A are planes orthogonal to the central axis AX of the rotor core 3A when viewed in the axial direction, and form a V shape.

The first permanent magnet 5U and the second permanent magnet 5D are magnetized so that the magnetization alignment direction is the direction indicated by arrow 41. That is, the first permanent magnet 5U and the second permanent magnet 5D are magnetized so that the opposing surfaces 4VL of the first magnet insertion hole 61A and the second magnet insertion hole 62A of the circumferential direction D1 are at right angles. In addition, in the rotor core 3A, the group of the first permanent magnet 5U and the second permanent magnet 5D magnetized as described above are alternately arranged in the circumferential direction D1 with different polarities.

The magnetic flux generated in the first permanent magnet 5U and the second permanent magnet 5D flows away from the magnet insertion hole adjacent to the circumferential direction D1 toward the outside of the radial direction D3 of the rotor core 3A as shown by the wavy arrow 42 and flows into the first The stator 1 shown in the figure.

The angle α formed by the opposing surfaces 4VL of the first magnet insertion hole 61A and the second magnet insertion hole 62A constituting one magnetic pole 7 is less than 90 °. With this configuration, the cross-sectional area of one magnetic pole 7 can be narrowed, and at the same time, the magnetic flux can be increased, and a rotating electric machine with a large motor torque can be obtained.

As shown in FIG. 5, the first permanent magnet 5U inserted into the first magnet insertion hole 61A is arranged close to one end surface 32 of the rotor core 3A, and the second permanent magnet 5D inserted into the second magnet insertion hole 62A It is arranged close to the other end surface 33 of the rotor core 3A.

The first permanent magnet 5U and the second permanent magnet 5D are arranged in the circumferential direction D1 so as to be asymmetric with respect to the magnetic pole center plane SV, and the axis is perpendicular to the axis direction D2 with respect to the stacking direction of the rotor core 3 The direction center plane SH is arranged in the axial direction D2 so as to be asymmetric. Furthermore, the first permanent magnet 5U and the second permanent magnet 5D are arranged symmetrically with respect to the intersection line CL.

According to the rotor 2A of the second embodiment, the same effect as the rotor 2 of the first embodiment can be obtained, and the motor torque can be further improved.

    Embodiment 3    

Fig. 6 is a perspective view showing an arrangement of permanent magnets corresponding to one of the plural magnetic poles of the rotor of the third embodiment. In the rotor core 3B of the rotor 2B of the third embodiment, one magnetic pole 7 is formed by the first permanent magnet 5U, the second permanent magnet 5D, and the third permanent magnet 5M.

The first permanent magnet 5U is inserted into the first magnet insertion hole 61B, and the second permanent magnet 5D is inserted into the second magnet insertion hole 62B. The third permanent magnet 5M is inserted into the third magnet insertion hole 63B formed in the magnetic pole center 71 of the circumferential direction D1.

The first magnet insertion hole 61B, the second magnet insertion hole 62B, and the third magnet insertion hole 63B are formed apart from each other in the circumferential direction D1, and are formed symmetrically with respect to the magnetic pole center plane SV. The first magnet insertion hole 61B, the second magnet insertion hole 62B, and the third magnet insertion hole 63B are arranged in the order of the first magnet insertion hole 61B, the third magnet insertion hole 63B, and the second magnet insertion hole 62B with respect to the circumferential direction D1 .

Each of the first magnet insertion hole 61B, the second magnet insertion hole 62B, and the third magnet insertion hole 63B penetrates from one end surface 32 to the other end surface 33 of the rotor core 3B in the axial direction D2. Each of the first magnet insertion hole 61B, the second magnet insertion hole 62B, and the third magnet insertion hole 63B is formed in a rectangular parallelepiped shape, and is formed at a position close to the outer peripheral surface 31 of the rotor core 3B.

The first magnet insertion hole 61B and the second magnet insertion hole 62B are formed so that the distance between the opposing surfaces extends from the central axis AX toward the outer peripheral surface 31 of the rotor core 3B. The third magnet insertion hole 63B is formed inside the first magnet insertion hole 61B and the second magnet insertion hole 62B in the radial direction D3.

The first permanent magnet 5U inserted into the first magnet insertion hole 61B is disposed near one end surface 32 of the rotor core 3B, and the second permanent magnet 5D inserted into the second magnet insertion hole 62B is disposed near the rotor core 3B The position of the other end surface 33. The third permanent magnet 5M inserted into the third magnet insertion hole 63B is arranged at the center 34 in the axial direction. That is, three permanent magnets divided into three in the axial direction D2 are arranged on the upper side, the center side, and the lower side of the rotor core 3B in the axial direction D2.

According to the rotor 2B of the third embodiment, the change in the magnetic force due to the three permanent magnets becomes gentle, and the cogging torque can be further reduced. In addition, in the rotor 2B of the third embodiment, if the axial lengths of the first permanent magnet 5U and the second permanent magnet 5D are the same, there is no need for the first permanent magnet 5U, the second permanent magnet 5D, and the third permanent magnet 5M The length in each axis direction is set to be the same. In addition, the positioning of the third permanent magnet 5M is more difficult than the first permanent magnet 5U and the second permanent magnet 5D, so after inserting the third permanent magnet 5M, the width of the axial direction D2 may not be equal The non-magnetic spacer is provided between the gaps of the third magnet insertion holes 63B, that is, above and below the third permanent magnet 5M. As a result, the determination accuracy of the third permanent magnet 5M is improved, and the reduction effect of the cogging torque can be further improved.

Furthermore, according to the rotor 2B of the third embodiment, since the three permanent magnets are arranged at an angle inclined with respect to the axial direction D2, compared with the rotor of Patent Document 1, the effect of the slope becomes larger and the embedding can be further reduced Tooth torque.

Fig. 7 is a diagram showing a first modification of the rotor of the first embodiment. In the rotor 2C shown in FIG. 7, in order to replace the first permanent magnet 5U and the second permanent magnet 5D shown in FIG. 2, the first permanent magnet 5U1 and the second permanent magnet 5D1 are used. The first permanent magnet 5U1 is composed of two permanent magnets 5Ua, 5Ub divided in the axial direction D2, and the second permanent magnet 5D1 is composed of two permanent magnets 5Da, 5Db divided in the axial direction D2.

The first permanent magnet 5U1 inserted into the first magnet insertion hole 61 is arranged close to one end surface 32 of the rotor core 3, and the second permanent magnet 5D1 inserted into the second magnet insertion hole 62 is arranged close to the rotor core 3. The position of the other end surface 33.

Let the width from one end surface 32 to the other end surface 33 of the rotor core 3 in the axial direction D2 be Lr, the width of the first permanent magnet 5U1 in the axial direction D2 be Lmu, and the second permanent magnet in the axial direction D2 When the width of 5D1 is Lmd, each of the width Lmu and the width Lmd is longer than the width Lr / 2 and shorter than the width Lr. In this way, the first permanent magnet 5U1 and the second permanent magnet 5D1 are arranged such that part of them overlap in the circumferential direction D1. According to the rotor 2C shown in FIG. 7, the magnetic flux can be increased while being arranged in a stepped slope, so the torque of the motor can be increased while suppressing the cogging torque.

Fig. 8 is a diagram showing a second modification of the rotor of the first embodiment. In the rotor 2D shown in FIG. 8, the first permanent magnet 5U2 and the second permanent magnet 5D2 are used instead of the first permanent magnet 5U and the second permanent magnet 5D shown in FIG. 2. The first permanent magnet 5U2 inserted into the first magnet insertion hole 61 is arranged close to one end surface 32 of the rotor core 3, and the second permanent magnet 5D2 inserted into the second magnet insertion hole 62 is arranged close to the rotor core 3. The position of the other end surface 33.

Let the width from one end surface 32 to the other end surface 33 of the rotor core 3 in the axial direction D2 be Lr, the width of the first permanent magnet 5U2 in the axial direction D2 be Lmu, and the second permanent magnet in the axial direction D2 When the width of 5D2 is Lmd, each of the width Lmu and the width Lmd is longer than the width Lr / 2 and shorter than the width Lr.

The first permanent magnet 5U1 and the second permanent magnet 5D1 are arranged such that part of them overlap in the circumferential direction D1. According to the rotor 2C shown in FIG. 8, the magnetic flux can be increased while being arranged in a stepped slope, so that the torque of the motor can be increased while suppressing the cogging torque.

In the rotor 2D, the first permanent magnet 5U2 and the second permanent magnet 5D2 are of the same size, the circumferential width Wmu of the first permanent magnet 5U2 is equal to the circumferential width Wmd of the second permanent magnet 5D2, and the first permanent magnet The radial width Tmu of 5U2 is equal to the radial width Tmd of the second permanent magnet 5D2. In this way, by using the first permanent magnet 5U2 and the second permanent magnet 5D2 of the same size, and compared with the case of two or more types of permanent magnets of different sizes, the quality variation is suppressed and the yield is improved, which can be reduced The manufacturing cost of permanent magnets.

Fig. 9 is a diagram showing a modification of the rotor of the third embodiment. In the rotor 2E shown in FIG. 9, the third permanent magnet 5N is used instead of the third permanent magnet 5M shown in FIG. 6. The third permanent magnet 5N is inserted into the third magnet insertion hole 63B, and is composed of permanent magnets 5Na and 5Nb divided into two in the axial direction D2.

The width of the third permanent magnet 5N in the axial direction D2 is equal to the width of the rotor core 3 in the axial direction D2. A part of the axial direction D2 of the first permanent magnet 5U and the third permanent magnet 5N is arranged so as to overlap in the circumferential direction D1, and a part of the second permanent magnet 5D and the third permanent magnet 5N are stacked in the circumferential direction D1 Configure in a proper way. According to the rotor 2E shown in FIG. 9, the magnetic flux is increased while being arranged in a stepped slope, so that the torque of the motor can be increased while suppressing the cogging torque.

    Embodiment 4    

Fig. 10 is a vertical cross-sectional view of a shaft of a rotating electric machine equipped with the rotor of the fourth embodiment. In the rotor 2F of FIG. 10, one magnetic pole 7 is formed by the group of two permanent magnets 5 inserted into each of the two magnet insertion holes 6. The two magnet insertion holes 6 have the same shape as the first magnet insertion hole 61A and the second magnet insertion hole 62A shown in FIG. 4. Therefore, the permanent magnet 5 inserted into each of the two magnet insertion holes 6 is arranged on the upper side in the axial direction and on the lower side in the axial direction. The number of magnetic poles 7 of the rotor 2F is 14, and each magnetic pole 7 is arranged in the circumferential direction.

The stator 1 has twelve slots with 12 salient poles. In the rotating electric machine 100A provided with the rotor 2F of the fourth embodiment, since the facing areas of the magnetic poles on the rotor 2F side and the stator 1 side become closer, the motor torque can be effectively increased. Therefore, according to the fourth embodiment, a rotary electric machine 100A with a small cogging torque and a large motor torque can be obtained.

Furthermore, in the rotors of the first, second, and fourth embodiments, the number of magnet insertion holes formed in the rotor core is two per one magnetic pole. By this, compared with the case where three or more magnet insertion holes with respect to one magnetic pole are formed, the quality variation is suppressed, the yield of the rotor core manufacturing is improved, and the number of permanent magnets constituting one magnetic pole is reduced , At the same time to obtain a slope structure can reduce cogging torque.

In addition, the rotors of Embodiments 1 to 4 can also be constructed so that all permanent magnets used in the rotor core have the same shape. When two or more types of permanent magnets with different sizes are used by this configuration, the yield will increase and the manufacturing cost of the permanent magnets can be reduced.

In addition, the rotors of the first to fourth embodiments can also be constructed so that all the magnet insertion holes formed in the rotor core have the same shape. Compared with the case where two or more types of magnet insertion holes of different sizes are formed by this configuration, the installation of permanent magnets is easier, and the manufacturing cost of the rotor can be reduced.

The configuration shown in the above embodiment is an example showing the content of the present invention, and may be combined with other well-known technologies, and a part of the configuration may be omitted or changed without departing from the gist of the present invention.

Claims (13)

    A rotor is provided with: a rotor core, which forms a plurality of the magnet insertion holes with respect to one magnetic pole; a permanent magnet, which is inserted into each of the plurality of magnet insertion holes; and includes a central axis connecting the rotor core and the magnetic pole The line of the magnetic pole center, and with respect to the central plane of the magnetic pole parallel to the axis direction of the central axis, the magnet insertion hole is formed symmetrically in the circumferential direction of the rotor core and passes through the center of the axis direction of the central axis, and The permanent magnets are arranged asymmetrically with respect to the axial direction center plane orthogonal to the magnetic pole center plane, and are arranged asymmetrically with respect to the magnetic pole center plane toward the circumferential direction. The center is located on a line that bisects the width of the outer circumferential surface of the magnetic pole in the circumferential direction.         The rotor according to item 1 of the scope of the patent application, wherein the arrangement pattern of the plurality of permanent magnets constituting each of the plurality of magnetic poles formed on the rotor core coincides with each of the magnetic poles.         The rotor according to claim 1 or claim 2, wherein the plurality of permanent magnets constituting one magnetic pole are arranged point-symmetrically with respect to the intersection of the magnetic pole central plane and the axial center plane.         The rotor according to claim 1 or claim 2, wherein the number of the magnet insertion holes formed in the rotor core is two with respect to one magnetic pole.         The rotor according to item 3 of the scope of the patent application, wherein the number of the magnet insertion holes formed in the rotor core is two per one magnetic pole.         The rotor according to item 4 of the patent application scope, wherein the two magnet insertion holes are viewed from the axial direction of the surface of the rotor core orthogonal to the central axis, and are formed in a V shape, and the two magnets are inserted The angle formed by the opposing surfaces of the holes is less than 90 °.         The rotor according to item 5 of the patent application scope, wherein the two magnet insertion holes are viewed from the axial direction of the surface of the rotor core orthogonal to the central axis, and are formed in a V shape, and the two magnets are inserted The angle formed by the opposing surfaces of the holes is less than 90 °.         The rotor according to claim 1 or claim 2, wherein the number of the magnet insertion holes formed in the rotor core is three with respect to one magnetic pole.         The rotor according to item 3 of the patent application scope, wherein the number of the magnet insertion holes formed in the rotor core is three with respect to one magnetic pole.         The rotor according to claim 1 or claim 2, wherein the plurality of permanent magnets constituting one magnetic pole are arranged so that part of each of them overlaps in the circumferential direction.         The rotor according to item 1 or 2 of the patent application scope, wherein the permanent magnets used for all the rotor cores have the same shape.         The rotor according to item 1 or 2 of the patent application scope, wherein the shapes of the magnet insertion holes formed in all the rotor cores are the same.         A rotating electric machine comprising a rotor according to the first or second patent application and a stator in which the stator of the rotor is arranged, wherein the number of the magnetic poles is 10 × n or 14 × n, the number of slots of the stator is 12 × m, and the n and the m are natural numbers.