CN113036961B

CN113036961B - Rotary electric machine

Info

Publication number: CN113036961B
Application number: CN202011450465.9A
Authority: CN
Inventors: 服部宏之
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2019-12-25
Filing date: 2020-12-09
Publication date: 2023-10-03
Anticipated expiration: 2040-12-09
Also published as: CN113036961A; JP7172979B2; JP2021103928A

Abstract

The invention provides a rotary electric machine capable of suppressing reduction of efficiency even if exciting magnetic flux is generated by energizing an exciting coil. A rotating electrical machine is provided with: a rotation shaft member; a rotor having a rotor core in which a plurality of soft magnetic plates are laminated and a plurality of permanent magnets; a stator having a stator core and a stator coil in which a plurality of soft magnetic plates are laminated; and an exciting coil disposed on the outer side of the rotor and the stator core with respect to the axial direction, wherein the rotor end portion is provided with a smaller number of permanent magnets or no permanent magnets than the rotor center portion, and the direction of the magnet flux and the exciting flux in the radial direction is the same in one magnetic pole and opposite in the other magnetic pole, and the magnetic resistance in the radial direction at the position corresponding to the one magnetic pole in the circumferential direction is smaller than the magnetic resistance in the radial direction at the position corresponding to the other magnetic pole in the circumferential direction at the rotor end portion.

Description

Rotary electric machine

Technical Field

The present invention relates to a rotating electrical machine.

Background

Patent document 1 discloses a rotating electrical machine including: a rotor provided on the shaft and having a circular rotor core in which a plurality of permanent magnets are buried; a stator having an annular stator core and a stator coil arranged at a radial interval from the rotor core; an excitation yoke disposed outside the rotor and the stator in the axial direction; and an exciting coil provided to the exciting yoke and generating exciting magnetic fluxes flowing between the exciting yoke, the rotor core, and the stator core.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2008-043099

Disclosure of Invention

In the rotating electrical machine disclosed in patent document 1, when exciting magnetic flux is generated by energizing the exciting coil, a part of the magnet magnetic flux generated by the permanent magnet interferes with a part of the exciting magnetic flux, and the magnet magnetic flux and the exciting magnetic flux between the rotor and the stator are reduced, which may reduce the efficiency of the rotating electrical machine.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a rotary electric machine capable of suppressing a decrease in efficiency even when exciting magnetic flux is generated by energizing an exciting coil.

In order to solve the above problems and achieve the object, a rotary electric machine according to the present invention includes: a rotation shaft member rotatable about an axis; a rotor fixed to the rotary shaft member, the rotor having a rotor core formed in a circular shape by stacking a plurality of soft magnetic plates in an axial direction of the rotary shaft member, a plurality of permanent magnets being provided in a circumferential direction of the rotor core, and magnetic poles of N-poles and magnetic poles of S-poles being alternately formed; a stator that is disposed at an interval in a radial direction, which is a direction orthogonal to an axial direction of the rotary shaft member, with respect to the rotor, and that has a stator core formed in a circular shape by stacking a plurality of soft magnetic plates in the axial direction, and that is provided with a stator coil; and an exciting coil disposed on the outer side of the rotor and the stator core with respect to the axial direction, wherein exciting magnetic fluxes are generated between the rotor core and the stator core by energization, wherein the number of permanent magnets is smaller than or the number of permanent magnets is not provided at a rotor end portion of the rotor, which is an end portion of the rotor on the exciting coil side in the axial direction, or the number of permanent magnets is smaller than or the number of permanent magnets is not provided at a rotor center portion of the rotor, which is a center portion of the rotor, wherein a direction of a magnetic flux of a magnet generated by the permanent magnets in one of magnetic poles of the N pole and magnetic poles of the S pole is the same as a direction of the exciting magnetic fluxes between the rotor core and the stator core in the radial direction, and wherein a direction of the magnetic fluxes of the magnet in the other magnetic pole is opposite to the direction of the exciting magnetic fluxes between the rotor core and the stator core in the radial direction, and a reluctance of the other magnetic pole in the circumferential direction is smaller than a corresponding position of the magnetic pole in the radial direction of the rotor at the other magnetic pole at a position corresponding to the one of the rotor center portion in the circumferential direction.

In this way, in the rotating electrical machine according to the present invention, the rotor core and the stator core are each formed by stacking a plurality of soft magnetic plates in the axial direction, so that the magnetic resistance in the axial direction of each of the rotor core and the stator core is larger than the magnetic resistance in the radial direction. Therefore, in the rotor core and the stator core, the exciting magnetic flux flows more easily in the radial direction than in the axial direction. Therefore, the exciting magnetic flux flows more in the rotor end portion, which is the end portion on the exciting coil side in the axial direction, than in the rotor center portion. Further, since the rotor end portion is provided with a smaller number of permanent magnets than the rotor center portion or no permanent magnets, the exciting magnetic flux at the rotor end portion is less likely to interfere with the magnet magnetic flux, and the exciting magnetic flux at the rotor end portion and the magnet magnetic flux can be suppressed from canceling each other and reducing. In addition, at the rotor end, the magnetic resistance at a position corresponding to one magnetic pole of the rotor center portion facing the same direction in the radial direction of the magnet flux and the exciting flux is smaller than the magnetic resistance at a position corresponding to the other magnetic pole of the rotor center portion facing the opposite direction in the radial direction of the magnet flux and the exciting flux. Therefore, at the rotor end, the excitation magnetic flux flows more easily than the position corresponding to the one magnetic pole. In this way, a part of the magnet flux in the one magnetic pole in the rotor center portion is less likely to interfere with the excitation flux at the rotor end portion, and the part of the magnet flux and the excitation flux can be suppressed from canceling each other and reducing. Therefore, in the rotating electrical machine according to the present invention, even when the exciting coil is energized to generate the exciting magnetic flux, the magnet magnetic flux between the rotor and the stator and the exciting magnetic flux are reduced, and the efficiency of the rotating electrical machine is reduced.

In the above, the permanent magnet may be provided in the rotor center portion in each of the one magnetic pole and the other magnetic pole.

This can increase the magnetic flux generated by the permanent magnet in the center of the rotor.

In the above, the permanent magnet may not be provided in the one magnetic pole at the center of the rotor, and the permanent magnet may be provided in the other magnetic pole.

This reduces the number of permanent magnets in the rotor center portion, thereby realizing cost reduction.

In the above, the rotor core at the rotor end may have a shape in which the flow easiness of the exciting magnetic flux in the radial direction is different between a position corresponding to the one magnetic pole at the rotor center portion in the circumferential direction and a position corresponding to the other magnetic pole at the rotor center portion in the circumferential direction.

As a result, the exciting magnetic flux is more likely to flow in the position of the rotor end portion corresponding to the one magnetic pole than in the position of the rotor end portion corresponding to the other magnetic pole, and the exciting magnetic flux of the rotor end portion and a part of the magnet magnetic flux of the rotor center portion are less likely to interfere with each other by the shape of the rotor core in the rotor end portion.

In the above, the permanent magnet may not be provided at the rotor end, and a notch portion recessed from the outer side toward the inner side in the radial direction may be provided at an outer peripheral portion of the rotor core at a position corresponding to the other magnetic pole of the rotor center portion in the circumferential direction.

This makes it possible to prevent the excitation magnetic flux at the rotor end portion and a part of the magnet magnetic flux at the rotor center portion from being disturbed.

In the above, the permanent magnet may not be provided at the rotor end, and a gap may be provided in the rotor core at the rotor end at a position corresponding to the other magnetic pole of the rotor center in the circumferential direction.

In the above, the void may be a slit having a concave arc formed from the outer side toward the inner side in the radial direction, and a plurality of slits may be provided in the rotor core at the rotor end portion so as to be spaced apart in the radial direction.

Thus, the plurality of slits provided in the rotor core at the rotor end portion can prevent the exciting magnetic flux from flowing in the radial direction, and the three-phase magnetic flux from the stator can easily flow between the plurality of slits of the rotor core. Therefore, the excitation magnetic flux and the three-phase magnetic flux are less likely to interfere with each other, and the rotational torque can be generated at the rotor end portion by the rotational magnetic field generated by the three-phase magnetic flux.

In the above, the permanent magnet may be provided at a position of the rotor end portion corresponding to the other magnetic pole of the rotor center portion in the circumferential direction, and the permanent magnet may not be provided at a position of the rotor end portion corresponding to the one magnetic pole of the rotor center portion in the circumferential direction.

Thus, the exciting magnetic flux is less likely to interfere with the magnet magnetic flux at the rotor end, and the rotational torque due to the magnet magnetic flux can be generated at the rotor end.

In the above, the excitation magnetic flux may flow from the stator core toward the rotor core in the radial direction, one of the magnetic poles may be the S-pole magnetic pole, and the other magnetic pole may be the N-pole magnetic pole.

This makes it possible to match the direction of the magnet flux in the one magnetic pole with the excitation flux flowing from the stator core toward the rotor core in the radial direction.

In the above, an excitation yoke may be provided on the outer side of the rotor and the stator in the axial direction, and the excitation coil may be wound around the excitation yoke.

Thus, a magnetic circuit based on the excitation magnetic flux generated by the excitation coil can be formed between the ends of the rotor and the stator in the axial direction and the excitation yoke.

In the rotating electrical machine according to the present invention, since the rotor core and the stator core are each formed by stacking a plurality of soft magnetic plates in the axial direction, the magnetic resistance in the axial direction of each of the rotor core and the stator core is larger than the magnetic resistance in the radial direction. Therefore, in the rotor core and the stator core, the exciting magnetic flux flows more easily in the radial direction than in the axial direction. Therefore, the rotor end portion, which is the end portion on the exciting coil side in the axial direction, flows more exciting magnetic flux than the rotor center portion in the rotor. Further, since the rotor end portion is provided with a smaller number of permanent magnets than the rotor center portion or no permanent magnets, the exciting magnetic flux at the rotor end portion is less likely to interfere with the magnet magnetic flux, and the exciting magnetic flux at the rotor end portion and the magnet magnetic flux can be suppressed from canceling each other and reducing. In addition, at the rotor end, the magnetic resistance at a position corresponding to one magnetic pole of the rotor center portion facing the same direction in the radial direction of the magnet flux and the exciting flux is smaller than the magnetic resistance at a position corresponding to the other magnetic pole of the rotor center portion facing the opposite direction in the radial direction of the magnet flux and the exciting flux. Therefore, at the rotor end, the excitation magnetic flux flows more easily at the position corresponding to the one magnetic pole than at the position corresponding to the other magnetic pole. In this way, a part of the magnet flux in the one magnetic pole in the rotor center portion is less likely to interfere with the excitation flux at the rotor end portion, and the part of the magnet flux and the excitation flux can be suppressed from canceling each other and reducing. Therefore, the rotating electrical machine according to the present invention has an effect that even when the exciting coil is energized to generate exciting magnetic flux, the phenomenon that the magnet magnetic flux between the rotor and the stator and the exciting magnetic flux decrease to reduce the efficiency of the rotating electrical machine can be suppressed.

Drawings

Fig. 1 is a cross-sectional view of the rotating electrical machine according to embodiment 1, as viewed from a direction perpendicular to the axial direction.

Fig. 2 (a) is a cross-sectional view of C1-C1 in fig. 1 of the rotor center according to embodiment 1. Fig. 2 (b) is a sectional view A1-A1 of fig. 1 of the rotor end according to embodiment 1.

Fig. 3 is a cross-sectional view of the rotating electrical machine according to embodiment 1 showing the flow of excitation magnetic flux when viewed from a direction orthogonal to the axial direction.

Fig. 4 (a) is a C2-C2 cross-sectional view of fig. 3 of the rotor center according to embodiment 1. Fig. 4 (b) is a sectional view A2-A2 of fig. 3 of the rotor end according to embodiment 1.

Fig. 5 (a) is a cross-sectional view of C1-C1 in fig. 1 of the rotor center according to embodiment 2. Fig. 5 (b) is a sectional view A1-A1 of fig. 1 of the rotor end according to embodiment 2.

Fig. 6 (a) is a C2-C2 cross-sectional view of fig. 3 of the rotor center according to embodiment 2. Fig. 6 (b) is a sectional view A2-A2 of fig. 3 of the rotor end according to embodiment 2.

Fig. 7 (a) is a cross-sectional view of C1-C1 in fig. 1 of the rotor center according to embodiment 3. Fig. 7 (b) is a sectional view A1-A1 of fig. 1 of a rotor end portion according to embodiment 3.

Fig. 8 (a) is a C2-C2 cross-sectional view of fig. 3 of the rotor center according to embodiment 3. Fig. 8 (b) is a sectional view A2-A2 of fig. 3 of the rotor end according to embodiment 3.

Fig. 9 (a) is a cross-sectional view of C1-C1 in fig. 1 of the rotor center according to embodiment 4. Fig. 9 (b) is a sectional view A1-A1 of fig. 1 of a rotor end portion according to embodiment 4.

Fig. 10 (a) is a C2-C2 cross-sectional view of fig. 3 of the rotor center according to embodiment 4. Fig. 10 (b) is a sectional view A2-A2 of fig. 3 of the rotor end according to embodiment 4.

Fig. 11 (a) is a cross-sectional view of C1-C1 in fig. 1 of the rotor center according to embodiment 5. Fig. 11 (b) is a sectional view A1-A1 of fig. 1 of a rotor end portion according to embodiment 5.

Fig. 12 (a) is a C2-C2 cross-sectional view of fig. 3 of the rotor center according to embodiment 5. Fig. 12 (b) is a sectional view A2-A2 of fig. 3 of the rotor end according to embodiment 5.

(symbol description)

1: a rotating electric machine; 2: a shaft lever; 3: a rotor; 3A, 3B: a rotor end; 3C: a rotor center portion; 4: a stator; 5A, 5B: an excitation yoke; 6A, 6B: an exciting coil; 31A, 31B: a rotor core end; 31C: a rotor core center portion; 32: a permanent magnet; 33A: a protruding pole part; 34A: a notch portion; 35A, 37A, 38C: iron core magnetic pole parts; 36A: a slit portion; 41: a stator core; 42: a stator coil; 51A, 51B: an outer side wall portion; 52A, 52B: an end wall portion; 53A, 53B: an inner side wall portion; 361a, 361b, 361c: a slit.

Detailed Description

(embodiment 1)

Embodiment 1 of a rotating electrical machine according to the present invention will be described below. The present invention is not limited to the present embodiment.

Fig. 1 is a cross-sectional view of a rotary electric machine 1 according to embodiment 1, as viewed from a direction perpendicular to an axis direction D1.

As shown in fig. 1, a rotary electric machine 1 according to embodiment 1 includes a shaft 2, a rotor 3, a stator 4, an exciting yoke 5A, an exciting yoke 5B, an exciting coil 6A, an exciting coil 6B, and the like, and is used to function as at least one of a motor and a generator.

The shaft 2 is a metallic rotating shaft member that is long in the axial direction D1 and rotatable about the axis AX. In the following description, the "axial direction D1" is defined as the axial direction (longitudinal direction) of the shaft 2.

The rotor 3 includes a rotor end portion 3A, a rotor end portion 3B, and a rotor center portion 3C that are disposed on the same axis in contact with each other in the axial direction D1. The rotor end 3A is disposed on one end side in the axial direction D1. The rotor end 3B has the same structure as the rotor end 3A and is disposed on the other end side in the axial direction D1. The rotor center portion 3C has a different structure from the rotor end portions 3A and 3B, and is disposed between the rotor end portions 3A and 3B in the axial direction D1.

Further, the rotor end portion 3A and the rotor center portion 3C, and the rotor end portion 3B and the rotor center portion 3C are in contact with each other in the axial direction D1, but a gap or a nonmagnetic material may be provided between the rotor end portion 3A and the rotor center portion 3C, and between the rotor end portion 3B and the rotor center portion 3C, respectively.

Fig. 2 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 1 from C1 to C1 in fig. 1. As shown in fig. 2 (a), the rotor center portion 3C includes a rotor core center portion 31C and a plurality of permanent magnets 32.

The rotor core center 31C is formed in a cylindrical shape by stacking a plurality of electromagnetic steel plates, which are a plurality of soft magnetic plates, in the axial direction D1 of the shaft 2, and is directly fixed to the shaft 2 so as to be rotatable together with the shaft 2. Since the rotor core central portion 31C has a gap between the electromagnetic steel plates in the axial direction D1, the magnetic resistance in the axial direction D1 is larger than the magnetic resistance in the radial direction D2, which is a direction orthogonal to the axial direction D1 of the rotor core central portion 31C, and the circumferential direction D3 of the rotor core central portion 31. Therefore, in the rotor core central portion 31C, the magnetic flux is less likely to flow in the axial direction D1, and the magnetic flux is more likely to flow in the radial direction D2 and the circumferential direction D3.

As shown in fig. 2 (a), a plurality of permanent magnets 32 extending in the axial direction D1 are provided on the outer peripheral portion of the rotor core central portion 31C. The permanent magnets 32 are arranged in adjacent pairs of 2 pairs, and have a V-shape that opens radially outward. The pair of permanent magnets 32 are arranged to have the same polarity orientation. For example, the N poles of the pair of permanent magnets 32 are arranged to face the outside in the radial direction D2 of the rotor core center portion 31C, and one magnetic pole PC1 is formed. Further, one magnetic pole PC2 is formed by arranging the S-pole outside the radial direction D2 in the other pair of permanent magnets 32 adjacent to the pair of permanent magnets 32 forming the magnetic pole PC1 in the circumferential direction D3. The rotor center portion 3C includes 8 poles (magnetic poles PC1 and PC 2) each including a pair of permanent magnets 32 disposed so as to extend in a V-shape toward the radial outside so that the N poles and the S poles alternate with each other at the outer peripheral portion.

Fig. 2 (b) is a sectional view A1-A1 in fig. 1 of a rotor end 3A according to embodiment 1. Since the rotor end 3A and the rotor end 3B have the same structure as described above, the rotor end 3A will be described below, and the description of the rotor end 3B will be omitted. As shown in fig. 2 (b), the rotor end portion 3A is a rotor not provided with the permanent magnets 32, and has a rotor core end portion 31A in which 4 protruding pole portions 33A and 4 notched portions 34A are alternately provided in the circumferential direction D3.

The rotor core end 31A is formed in a circular shape by stacking a plurality of electromagnetic steel plates in the axial direction D1, and is directly fixed to the shaft 2 so as to be rotatable together with the shaft 2. Regarding the rotor core end 31A, the outer diameter in the salient pole portion 33A is the same as the outer diameter of the rotor core end 31A. Since the rotor core end 31A has a gap between the electromagnetic steel plates in the axial direction D1, the magnetic resistance in the axial direction D1 is larger than the magnetic resistance in the radial direction D2 and the circumferential direction D3. Therefore, in the rotor core end 31A, the magnetic flux is less likely to flow in the axial direction D1, and the magnetic flux is more likely to flow in the radial direction D2 and the circumferential direction D3.

The rotor core end 31A is shaped so that the flow easiness of the excitation magnetic flux MF1 in the radial direction D2 is different between a position (magnetic pole PA 2) corresponding to the magnetic pole PC2 as one magnetic pole of the rotor center portion 3C in the circumferential direction D3 and a position (magnetic pole PA 1) corresponding to the magnetic pole PC1 as the other magnetic pole of the rotor center portion 3C in the circumferential direction D3.

The 4 protruding pole portions 33A are located on a concentric circle at a mechanical angle of 90 ° in the circumferential direction D3, protrude outward in the radial direction D2, and form a magnetic pole PA2 as a magnetic pole of the S-pole. In addition, the 4 projecting pole portions 33A are located at positions corresponding to the magnetic poles PC2 in the rotor center portion 3C in the circumferential direction D3, respectively. The 4 notched portions 34A are located concentrically at a mechanical angle of 90 ° in the circumferential direction D3, and are recessed from the outer periphery of the rotor core end 31A toward the inner side in the radial direction D2, thereby forming a magnetic pole PA1 as a magnetic pole of the N pole. The 4 notched portions 34A forming the magnetic pole PA1 are provided at positions corresponding to the magnetic pole PC1 in the rotor center portion 3C in the circumferential direction D3. In this way, the magnetic pole PA1 as the magnetic pole of the N pole and the magnetic pole PA2 as the magnetic pole of the S pole are alternately arranged in the circumferential direction D3 in the rotor end 3A.

As shown in fig. 1, the stator 4 includes a cylindrical stator core 41 disposed at a predetermined interval outward in the radial direction D2 of the rotor 3, and a stator coil 42 wound around the stator core 41. The stator core 41 is configured by stacking a plurality of electromagnetic steel plates in the axial direction D1. Since the stator core 41 has a gap between the electromagnetic steel plates in the axial direction D1, the magnetic resistance in the axial direction D1 is larger than the magnetic resistance in the radial direction D2 and the circumferential direction. Therefore, the magnetic flux does not easily flow in the axial direction D1 in the stator core 41, and the magnetic flux easily flows in the radial direction D2 and the circumferential direction.

The excitation yokes 5A and 5B are made of a magnetic material, and are, as shown in fig. 1, made of outer side wall portions 51A and 51B, end wall portions 52A and 52B, and inner side wall portions 53A and 53B, and are disposed outside the rotor 3 and the stator 4 with respect to the axial direction D1. The outer side wall 51A and the outer side wall 51B extend from the outer peripheral edge of the end wall 52A and the end wall 52B in the radial direction D2 toward the stator core 41 in the axial direction D1. The inner end surfaces of the outer side wall portions 51A, 51B in the axial direction D1 are in contact with the both end surfaces of the stator core 41 in the axial direction D1. The end wall portions 52A and 52B extend in the radial direction D2, and are disposed at positions apart from both ends of the rotor 3 and the stator 4 in the axial direction D1. The inner side wall portions 53A and 53B extend in the axial direction D1, are formed continuously with the inner peripheral edge portion in the radial direction D2 of the end wall portions 52A and 52B, and are disposed at a predetermined interval from both end surfaces of the rotor 3 in the axial direction D1. The inner side wall portions 53A and 53B are disposed at a predetermined interval from the shaft 2 in the radial direction D2.

On the surfaces of the end wall portions 52A, 52B on the rotor 3 side in the axial direction D1, excitation coils 6A, 6B are arranged in a circular shape and generate excitation magnetic fluxes by energization.

The stator 4 generates a rotating magnetic field by flowing three-phase alternating current through the stator coil 42 and flowing three-phase magnetic flux through the inner periphery of the stator 4. As a result, the magnetic poles formed on the outer peripheral portion of the rotor 3 attract and repel each other with the rotating magnetic field formed by the stator 4, and thereby a rotational torque is generated in the rotor 3. Further, since the salient pole portion 33A of the rotor end portion 3A is formed by the iron pole portion of the rotor core end portion 31A, the salient pole portion 33A of the rotor end portion 3A is attracted by the rotating magnetic field generated by the three-phase magnetic flux from the stator 4, and a rotational torque is generated.

Fig. 3 is a cross-sectional view of the rotating electric machine 1 according to embodiment 1, as viewed from a direction orthogonal to the axis direction D1, showing a flow of the excitation magnetic flux MF 1. In fig. 3, the flow of the excitation magnetic flux MF1 is indicated by solid arrows. As shown in fig. 3, when the exciting coil 6A is energized, a magnetic circuit is formed in which the exciting magnetic flux MF1 flows in the order of the inner wall portion 53A, the end wall portion 52A, the outer wall portion 51A, the stator core 41, and the rotor core end portion 31A when viewed from the inner wall portion 53A of the exciting yoke 5A. That is, the exciting coil 6A is energized, so that a magnetic circuit is formed among the exciting yoke 5A, the rotor end 3A, and the stator 4. At this time, since the magnetic resistance in the axial direction D1 in the stator core 41 is larger than the magnetic resistance in the radial direction D2 as described above, the excitation magnetic flux MF1 flowing from the outer side wall portion 51A of the excitation yoke 5A to the stator core 41 tends to flow from the end portion on the excitation coil 6A side in the axial direction D1 of the stator core 41 toward the rotor core end portion 31A in the radial direction D2. The amount of the excitation magnetic flux MF1 between the rotor end 3A and the stator 4 can be controlled by adjusting the amount of current flowing through the excitation coil 6A.

As shown in fig. 3, the exciting coil 6B is energized, so that a magnetic circuit is formed in which the exciting magnetic flux MF1B flows in the order of the inner wall portion 53B, the outer wall portion 51B, the end wall portion 52B, the stator core 41, and the rotor core end portion 31B when viewed from the inner wall portion 53B of the exciting yoke 5B. That is, the exciting coil 6B is energized, so that a magnetic circuit is formed among the exciting yoke 5B, the rotor end 3B, and the stator 4. At this time, since the magnetic resistance in the axial direction D1 in the stator core 41 is larger than the magnetic resistance in the radial direction D2 as described above, the excitation magnetic flux MF1 flowing from the outer side wall portion 51B of the excitation yoke 5B to the stator core 41 tends to flow from the end portion on the excitation coil 6B side in the axial direction D1 of the stator core 41 toward the rotor core end portion 31B in the radial direction D2. The amount of the excitation magnetic flux MF1 between the rotor end 3B and the stator 4 can be controlled by adjusting the amount of current flowing through the excitation coil 6B.

Fig. 4 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 1 from C2 to C2 in fig. 3. Fig. 4 (b) is a sectional view A2-A2 in fig. 3 of a rotor end 3A according to embodiment 1. In fig. 4 (a), the arrow indicated by the two-dot chain line indicates the flow of the three-phase magnetic flux MF2, and the arrow indicated by the broken line indicates the magnet magnetic flux MF3. In fig. 4 (b), the solid-line arrow indicates the excitation magnetic flux MF1, and the two-dot chain arrow indicates the three-phase magnetic flux MF2.

As shown in fig. 4 (a), in the rotor center portion 3C, the magnetic flux MF3 generated by the permanent magnets 32 of the respective magnetic poles PC1, PC2 and the three-phase magnetic flux MF2 from the stator 4 flow through the outer peripheral portion of the rotor core center portion 31C.

On the other hand, as shown in fig. 4 (b), at the rotor end 3A, the excitation magnetic flux MF1 from the stator 4 flows from the outside toward the inside in the radial direction D2 at each salient pole portion 33A of the rotor core end 31A. In addition, at the rotor end 3A, the three-phase magnetic flux MF2 from the stator 4 flows through the outer peripheral portion of the salient pole portion 33A of the rotor core end 31A. In the rotating electrical machine 1 according to embodiment 1, as shown in fig. 4 (b), since the permanent magnet 32 is not provided at the rotor end portion 3A, the excitation magnetic flux MF1 and the magnet magnetic flux MF3 flowing from the end portion on the excitation coil 6A side of the stator 4 toward the rotor end portion 3A are less likely to interfere with each other, and the excitation magnetic flux MF1 and the magnet magnetic flux MF3 can be suppressed from canceling each other and reducing.

In addition, at the rotor core end 31A, the magnetic resistance in the radial direction D2 at the position (magnetic pole PA 2) corresponding to the magnetic pole PC2 as one magnetic pole of the rotor core center portion 31C in the circumferential direction D3 is smaller than the magnetic resistance in the radial direction D2 at the position (magnetic pole PA 1) corresponding to the magnetic pole PC1 as the other magnetic pole of the rotor core center portion 31C in the circumferential direction D3. Therefore, the excitation magnetic flux MF1 easily flows in the rotor core end portion 31A from the outside toward the inside in the radial direction D2 via the salient pole portion 33A of the magnetic pole PA2 forming the rotor core end portion 31A.

As a result, a part of the magnet flux MF3 flowing from the rotor center portion 3C toward the stator 4 in the magnetic pole PC1 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 flowing from the stator 4 toward the rotor end portion 3A in the magnetic pole PA2 of the rotor core end portion 31A, and the part of the magnet flux MF3 and the excitation flux MF1 can be suppressed from canceling each other and reducing. In addition, a part of the magnet flux MF3 in the rotor center portion 3C is less likely to interfere with the excitation flux MF1 in the rotor end portion 3B, similarly to the excitation flux MF1 in the rotor end portion 3A, and a reduction in the part of the magnet flux MF3 can be suppressed. Therefore, the rotational torque based on the magnet flux MF3 can be efficiently generated in the rotor center portion 3C. Further, since the excitation magnetic flux MF1 of the rotor end portions 3A and 3B can be suppressed from interfering with a part of the magnet magnetic flux MF3 of the rotor center portion 3C to be reduced, the rotational torque due to the excitation magnetic flux MF1 can be generated more efficiently at the rotor end portions 3A and 3B.

In the rotating electrical machine 1 according to embodiment 1, the exciting magnetic flux MF1 and the magnet magnetic flux MF3 between the rotor 3 and the stator 4 can be reduced, and the efficiency of the rotating electrical machine 1 can be suppressed from being reduced.

(embodiment 2)

Embodiment 2 of a rotating electrical machine according to the present invention will be described below. Note that, the description of the portions common to the rotary electric machine 1 according to embodiment 1 is appropriately omitted.

In the rotary electric machine 1 according to embodiment 2, as in the rotary electric machine 1 according to embodiment 1, the rotor 3 includes a rotor end portion 3A disposed at one end portion in the axial direction D1, a rotor end portion 3B disposed at the other end portion in the axial direction D1, and a rotor center portion 3C disposed at a center portion in the axial direction D1, as shown in fig. 1.

Fig. 5 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 2 from C1 to C1 in fig. 1. Fig. 5 (b) is a sectional view A1-A1 of fig. 1 of a rotor end 3A according to embodiment 2.

As shown in fig. 5 (a), the rotor center portion 3C according to embodiment 2 has a rotor core center portion 31C and a plurality of permanent magnets 32, and has the same structure as the rotor center portion 3C of the rotating electrical machine 1 according to embodiment 1.

As shown in fig. 5 (b), the permanent magnets 32 are not provided at the rotor core end 31A of the rotor end 3A according to embodiment 2, and 4 core magnetic pole portions 35A and 4 slit portions 36A are alternately provided in the circumferential direction D3.

The rotor core end 31A is shaped such that the ease of flow of the excitation magnetic flux MF1 in the radial direction D2 differs between a position (magnetic pole PA 2) corresponding to the magnetic pole PC2 as one magnetic pole of the rotor center portion 3C in the circumferential direction D3 and a position (magnetic pole PA 1) corresponding to the magnetic pole PC1 as the other magnetic pole of the rotor center portion 3C in the circumferential direction D3.

The 4 core magnetic pole portions 35A are located on a concentric circle at intervals of 90 ° in the circumferential direction D3 at a mechanical angle, and form a magnetic pole PA2 as a magnetic pole of the S-pole. The 4 core magnetic pole portions 35A forming the magnetic pole PA2 are provided at positions corresponding to the magnetic pole PC2 of the rotor center portion 3C in the circumferential direction D3 at the rotor end portion 3A.

The 4 slit portions 36A are located on a concentric circle at intervals of 90 ° in the circumferential direction D3 at a mechanical angle, and form a magnetic pole PA1 as a magnetic pole of the N pole. Each of the 4 slit portions 36A is 3 void portions extending so as to intersect the radial direction D2, and has 3 slits 361a, 361b, 361c each having a concave arc formed from the outside toward the inside in the radial direction D2. Slits 361A, 361b, and 361c are provided in the order of slits 361A, 361b, and 361c from the outside toward the inside in the radial direction D2 in each of the plurality of electromagnetic steel plates constituting the rotor core end 31A. The 4 slit portions 36A forming the magnetic pole PA1 are provided at positions corresponding to the magnetic pole PC1 of the rotor center portion 3C in the circumferential direction D3 at the rotor end portion 3A. In this way, at the rotor end 3A, the magnetic pole PA1 as the magnetic pole of the N pole and the magnetic pole PA2 as the magnetic pole of the S pole are alternately arranged in the circumferential direction D3.

The number of slits provided in the slit portion 36A is not limited to 3, and 1 or more slits may be provided. The shape of the slit provided in the slit portion 36A is not limited to an arc shape recessed from the outside toward the inside in the radial direction D2, and may be, for example, a rectangular shape.

Fig. 6 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 2 from C2 to C2 in fig. 3. Fig. 6 (b) is a sectional view A2-A2 in fig. 3 of a rotor end 3A according to embodiment 2. In fig. 6 (a), the arrow indicated by the two-dot chain line indicates the flow of the three-phase magnetic flux MF2, and the arrow indicated by the broken line indicates the magnet magnetic flux MF3. In fig. 6 (b), the solid-line arrow indicates the excitation magnetic flux MF1, and the two-dot chain arrow indicates the three-phase magnetic flux MF2.

As shown in fig. 6 (a), in the rotor center portion 3C, the magnetic flux MF3 generated by the permanent magnets 32 of the respective magnetic poles PC1, PC2 and the three-phase magnetic flux MF2 from the stator 4 flow through the outer peripheral portion of the rotor core center portion 31C. In this way, in the rotor center portion 3C, a rotational torque can be generated in the rotor center portion 3C by the magnet torque generated by the magnet flux MF3 and the reactive torque generated by the three-phase flux MF2.

On the other hand, as shown in fig. 6 (b), at the rotor end portion 3A, the excitation magnetic flux MF1 from the stator 4 flows from the outside toward the inside in the radial direction D2 at the core magnetic pole portion 35A of the rotor core end portion 31A. In the rotating electrical machine 1 according to embodiment 2, as shown in fig. 6 (b), the permanent magnet 32 is not provided at the rotor end 3A of the rotor 3, so that the excitation magnetic flux MF1 and the magnet magnetic flux MF3 flowing from the end of the stator 4 on the side of the excitation coil 6A toward the rotor end 3A are less likely to interfere with each other, and the excitation magnetic flux MF1 and the magnet magnetic flux MF3 can be suppressed from canceling each other and reducing.

In addition, at the rotor core end 31A, 3 slits 361A, 361b, 361c provided at predetermined intervals in the radial direction D2 in the slit portion 36A become large magnetic resistances that prevent the flow of the excitation magnetic flux MF1 flowing from the outside toward the inside in the radial direction D2 with respect to the rotor core end 31A. Therefore, at the rotor core end portion 31A, the magnetic resistance in the core magnetic pole portion 35A forming the magnetic pole PA2 is smaller than the magnetic resistance in the slit portion 36A forming the magnetic pole PA 1. Therefore, the excitation magnetic flux MF1 easily flows in the rotor core end portion 31A from the outside toward the inside in the radial direction D2 via the core magnetic pole portion 35A forming the magnetic pole PA 2.

As a result, a part of the magnet flux MF3 flowing from the rotor center portion 3C toward the stator 4 in the magnetic pole PA1 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 flowing from the stator 4 toward the rotor end portion 3A in the magnetic pole PA2 of the rotor core end portion 31A, and the part of the magnet flux MF3 and the excitation flux MF1 can be suppressed from canceling each other and reducing. In addition, a part of the magnet flux MF3 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 of the rotor end portion 3B, similarly to the excitation flux MF1 of the rotor end portion 3A, and a reduction in the excitation flux can be suppressed. Therefore, the rotational torque based on the magnet flux MF3 can be efficiently generated in the rotor center portion 3C. Further, since the excitation magnetic flux MF1 of the rotor end portions 3A and 3B can be suppressed from interfering with a part of the magnet magnetic flux MF3 of the rotor center portion 3C to be reduced, the rotational torque due to the excitation magnetic flux MF1 can be generated more efficiently at the rotor end portions 3A and 3B.

In the rotating electrical machine 1 according to embodiment 2, the exciting magnetic flux MF1 and the magnet magnetic flux MF3 between the rotor 3 and the stator 4 can be reduced, and the efficiency of the rotating electrical machine 1 can be suppressed from being reduced.

As shown in fig. 6 (b), the three-phase magnetic flux MF2 from the stator 4 flows between the rotor core end portion 31A and the slit 361A, between the slit 361A and the slit 361b, and between the slit 361b and the slit 361c in the slit portion 36A of the rotor core end portion 31A at the rotor end portion 3A. As a result, the reactive torque generated by the three-phase magnetic flux MF2 can generate a rotational torque at the rotor end 3A, and the rotational efficiency of the rotating electrical machine 1 can be improved.

Embodiment 3

Embodiment 3 of a rotating electrical machine according to the present invention will be described below. Note that, the description of the portions common to the rotary electric machine 1 according to embodiment 1 is appropriately omitted.

In the rotary electric machine 1 according to embodiment 3, as in the rotary electric machine 1 according to embodiment 1, the rotor 3 includes a rotor end portion 3A disposed at one end portion in the axial direction D1, a rotor end portion 3B disposed at the other end portion in the axial direction D1, and a rotor center portion 3C disposed at a center portion in the axial direction D1, as shown in fig. 1.

Fig. 7 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 3 from C1 to C1 in fig. 1. Fig. 7 (b) is a sectional view A1-A1 of fig. 1 of a rotor end 3A according to embodiment 3.

As shown in fig. 7 (a), the rotor center portion 3C has a rotor core center portion 31C and a plurality of permanent magnets 32, and has the same structure as the rotor center portion 3C of the rotating electrical machine 1 according to embodiment 1. That is, in the circumferential direction D3, the magnetic pole PA1 as the magnetic pole of the N pole formed by the pair of permanent magnets 32 arranged in a V-shape so that the N pole faces outward in the radial direction D2 and the magnetic pole PA2 as the magnetic pole of the S pole formed by the pair of permanent magnets 32 arranged in a V-shape so that the S pole faces outward in the radial direction D2 are alternately arranged.

As shown in fig. 7 (b), the rotor end portion 3A has a rotor core end portion 31A and a smaller number of permanent magnets 32 than the rotor center portion 3C. Further, 4 magnetic poles PA1 as magnetic poles of the N pole and 4 magnetic poles PA2 as magnetic poles of the S pole are formed at the rotor end 3A.

The rotor end 3A has a structure in which the ease of flow of the excitation magnetic flux MF1 in the radial direction D2 differs between a position (magnetic pole PA 2) corresponding to the magnetic pole PC2 as one magnetic pole of the rotor center 3C in the circumferential direction D3 and a position (magnetic pole PA 1) corresponding to the magnetic pole PC1 as the other magnetic pole of the rotor center 3C in the circumferential direction D3.

The 4 magnetic poles PA1 are spaced apart at a mechanical angle of 90 ° in the circumferential direction D3, and are formed of a pair of permanent magnets 32 on concentric circles in the outer peripheral portion of the rotor core end portion 31A, respectively. The pair of permanent magnets 32 are arranged in a V-shape that opens outward in the radial direction D2 so that the N-poles of the 2 permanent magnets face outward in the radial direction D2 of the rotor core end 31A. The 4 magnetic poles PA1 are located at positions corresponding to the magnetic poles PC1 in the rotor center portion 3C in the circumferential direction D3. The 4 magnetic poles PA2 are each formed by a core magnetic pole portion 37A that is formed by a core portion of the rotor core end portion 31A without providing the permanent magnet 32 between the adjacent magnetic poles PA1 in the rotor core end portion 31A. The 4 magnetic poles PA2 are located at positions corresponding to the magnetic poles PC2 in the rotor center portion 3C in the circumferential direction D3. In this way, at the rotor end 3A, the magnetic poles PA1 of the N pole and the magnetic poles PA2 of the S pole are alternately arranged in the circumferential direction D3.

Fig. 8 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 3 from C2 to C2 in fig. 3. Fig. 8 (b) is a sectional view A2-A2 in fig. 3 of a rotor end 3A according to embodiment 3. In fig. 8 (a), the arrow indicated by the two-dot chain line indicates the flow of the three-phase magnetic flux MF2, and the arrow indicated by the broken line indicates the magnet magnetic flux MF3. In fig. 8 (b), the solid line arrow indicates the excitation magnetic flux MF1, the two-dot chain line arrow indicates the three-phase magnetic flux MF2, and the broken line arrow indicates the magnet magnetic flux MF3.

As shown in fig. 8 (a), in the rotor center portion 3C, the magnetic flux MF3 generated by the permanent magnets 32 of the respective magnetic poles PC1, PC2 and the three-phase magnetic flux MF2 from the stator 4 flow through the outer peripheral portion of the rotor core center portion 31C. In this way, in the rotor center portion 3C, a rotational torque can be generated in the rotor center portion 3C by the magnet torque generated by the magnet flux MF3 and the reactive torque generated by the three-phase flux MF 2.

On the other hand, as shown in fig. 8 (b), in the magnetic pole PA2 of the rotor end portion 3A, the excitation magnetic flux MF1 from the stator 4 flows from the outside toward the inside in the radial direction D2. In the rotating electrical machine 1 according to embodiment 3, as shown in fig. 8 (b), the permanent magnet 32 is not provided in the core magnetic pole portion 37A of the magnetic pole PA2 forming the rotor core end portion 31A, so that the excitation magnetic flux MF1 and the magnet magnetic flux MF3 flowing from the end portion on the excitation coil 6A side of the axial direction D1 of the stator 4 toward the rotor end portion 3A are less likely to interfere with each other, and the excitation magnetic flux MF1 and the magnet magnetic flux MF3 can be suppressed from canceling each other and decreasing.

As shown in fig. 8 (b), in the magnetic pole PA2 of the rotor core end portion 31A, the magnet flux MF3 generated by the permanent magnet 32 of the magnetic pole PA1 flows from the outside toward the inside in the radial direction D2 with respect to the rotor core end portion 31A, similarly to the excitation flux MF 1. Therefore, the disturbance between the exciting magnetic flux MF1 and the magnet magnetic flux MF3 generated by the permanent magnet 32 of the magnetic pole PA1 can be suppressed, and the exciting magnetic flux MF1 and the magnet magnetic flux MF3 cancel each other out and reduce. Therefore, the rotational torque based on the excitation magnetic flux MF1 can be efficiently generated at the rotor end 3A. In addition, in the rotor end portion 3B as well, the reduction of the excitation magnetic flux MF1 can be suppressed, and the rotational torque due to the excitation magnetic flux MF1 can be efficiently generated.

In addition, a part of the magnet flux MF3 flowing from the inside to the outside in the radial direction D2 of the magnetic pole PC1 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 flowing from the outside to the inside in the radial direction D2 of the magnetic pole PA2 of the rotor core end portion 31A, and the part of the magnet flux MF3 and the excitation flux MF1 can be suppressed from canceling each other and reducing. In addition, a part of the magnet flux MF3 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 of the rotor end portion 3B, similarly to the excitation flux MF1 of the rotor end portion 3A, and a reduction in the excitation flux can be suppressed. Therefore, in the rotating electrical machine 1 according to embodiment 3, the rotational torque based on the magnet magnetic flux MF3 can be efficiently generated in the rotor center portion 3C. Further, since the excitation magnetic flux MF1 of the rotor end portions 3A and 3B can be suppressed from interfering with a part of the magnet magnetic flux MF3 of the rotor center portion 3C to be reduced, the rotational torque due to the excitation magnetic flux MF1 can be generated more efficiently at the rotor end portions 3A and 3B.

In the rotating electrical machine 1 according to embodiment 3, the exciting magnetic flux MF1 and the magnet magnetic flux MF3 between the rotor 3 and the stator 4 can be reduced, and the efficiency of the rotating electrical machine 1 can be suppressed from being reduced.

As shown in fig. 8 (b), at the rotor end 3A, the three-phase magnetic flux MF2 from the stator 4 flows in the outer peripheral portion of the magnetic pole PA1 at the rotor core end 31A. As a result, the reactive torque generated by the three-phase magnetic flux MF2 can generate a rotational torque at the rotor end 3A, and the rotational efficiency of the rotating electrical machine 1 can be improved.

Embodiment 4

Embodiment 4 of a rotating electrical machine according to the present invention will be described below. Note that, the description of the portions common to the rotary electric machine 1 according to embodiment 1 is appropriately omitted.

In the rotary electric machine 1 according to embodiment 4, as in the rotary electric machine 1 according to embodiment 1, the rotor 3 includes a rotor end portion 3A disposed at one end portion in the axial direction D1, a rotor end portion 3B disposed at the other end portion in the axial direction D1, and a rotor center portion 3C disposed at a center portion in the axial direction D1, as shown in fig. 1.

Fig. 9 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 4 from C1 to C1 in fig. 1. Fig. 9 (b) is a sectional view A1-A1 of fig. 1 of a rotor end 3A according to embodiment 4.

As shown in fig. 9 (a), the rotor center portion 3C according to embodiment 4 has a rotor core center portion 31C and a plurality of permanent magnets 32, and has the same structure as the rotor end portion 3A according to embodiment 3. That is, the rotor center portion 3C has a structure in which magnetic poles PA1 as N-poles formed by a pair of permanent magnets 32 arranged in a V-shape so that the N-poles face outward in the radial direction D2 and magnetic poles PA2 as S-poles formed by the core magnetic pole portions 38C are alternately arranged in the circumferential direction D3. This can reduce the number of permanent magnets 32 in the rotor center portion 3C, and can reduce the cost.

As shown in fig. 9 (b), the rotor end 3A according to embodiment 4 has the same structure as the rotor end 3A according to embodiment 1. That is, at the rotor end 3A, 4 salient pole portions 33A forming the magnetic pole PA2 are provided at positions corresponding to the magnetic pole PC2 of the rotor center portion 3C in the circumferential direction D3. In addition, 4 notched portions 34A forming the magnetic pole PA1 are provided at positions corresponding to the magnetic pole PC1 of the rotor center portion 3C in the circumferential direction D3 at the rotor end portion 3A.

Fig. 10 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 4 from C2 to C2 in fig. 3. Fig. 10 (b) is a sectional view A2-A2 in fig. 3 of a rotor end 3A according to embodiment 4. In fig. 10 (a), the arrow indicated by the two-dot chain line indicates the flow of the three-phase magnetic flux MF2, and the arrow indicated by the broken line indicates the magnet magnetic flux MF3. In fig. 10 (b), the solid-line arrow indicates the excitation magnetic flux MF1, and the two-dot chain arrow indicates the three-phase magnetic flux MF2.

As shown in fig. 10 (a), in the rotor center portion 3C, the magnet flux MF3 generated by the permanent magnet 32 in the magnetic pole PC1 flows from inside to outside in the radial direction D2. In the rotor center portion 3C, the three-phase magnetic flux MF2 from the stator 4 flows through the outer peripheral portion of the magnetic pole PA1 in the rotor core center portion 31C. As a result, a rotational torque can be generated in the rotor center portion 3C by the magnet torque generated by the magnet flux MF3 and the reactive torque generated by the three-phase flux MF 2.

On the other hand, as shown in fig. 10 (b), at the rotor end 3A, the excitation magnetic flux MF1 from the stator 4 flows from the outside toward the inside in the radial direction D2 at each salient pole portion 33A of the rotor core end 31A. In addition, at the rotor end 3A, the three-phase magnetic flux MF2 from the stator 4 flows in the outer peripheral portion of the salient pole portion 33A of the rotor core end 31A.

In the rotating electrical machine 1 according to embodiment 4, as shown in fig. 10 (b), the permanent magnet 32 is not provided at the rotor end portion 3A of the rotor 3, so that the disturbance of the excitation magnetic flux MF1 and the magnet magnetic flux MF3 and the reduction of the disturbance of the excitation magnetic flux MF1 and the magnet magnetic flux MF3 due to the cancellation of each other can be suppressed. Therefore, the rotational torque based on the excitation magnetic flux MF1 can be efficiently generated at the rotor end 3A. In addition, in the rotor end portion 3B as well, the reduction of the excitation magnetic flux MF1 can be suppressed, and the rotational torque due to the excitation magnetic flux MF1 can be efficiently generated.

In addition, at the rotor core end 31A, the magnetic resistance in the magnetic pole PA2 as one magnetic pole corresponding to the position of the magnetic pole PC2 of the rotor core center 31C is smaller than the magnetic resistance in the magnetic pole PA1 as the other magnetic pole corresponding to the position of the magnetic pole PC1 of the rotor core center 31C. Therefore, the excitation magnetic flux MF1 easily flows in the rotor core end portion 31A from the outside toward the inside in the radial direction D2 via the salient pole portion 33A forming the magnetic pole PA 2.

As a result, a part of the magnet flux MF3 flowing from the inside to the outside in the radial direction D2 in the magnetic pole PA1 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 flowing from the outside to the inside in the radial direction D2 in the magnetic pole PA2 of the rotor core end portion 31A, and the part of the magnet flux MF3 and the excitation flux MF1 can be suppressed from canceling each other and reducing. In addition, a part of the magnet flux MF3 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 of the rotor end portion 3B, similarly to the excitation flux MF1 of the rotor end portion 3A, and a reduction in the excitation flux can be suppressed. Therefore, in the rotating electrical machine 1 according to embodiment 4, the rotational torque due to the magnet magnetic flux MF3 can be efficiently generated in the rotor center portion 3C. Further, since the excitation magnetic flux MF1 of the rotor end portions 3A and 3B can be suppressed from interfering with a part of the magnet magnetic flux MF3 of the rotor center portion 3C to be reduced, the rotational torque due to the excitation magnetic flux MF1 can be generated more efficiently at the rotor end portions 3A and 3B.

In the rotating electrical machine 1 according to embodiment 4, the exciting magnetic flux MF1 and the magnet magnetic flux MF3 between the rotor 3 and the stator 4 can be reduced, and the efficiency of the rotating electrical machine 1 can be suppressed from being reduced.

Embodiment 5

In the rotary electric machine 1 according to embodiment 5, as in the rotary electric machine 1 according to embodiment 1, the rotor 3 includes a rotor end portion 3A disposed at one end portion in the axial direction D1, a rotor end portion 3B disposed at the other end portion in the axial direction D1, and a rotor center portion 3C disposed at a center portion in the axial direction D1, as shown in fig. 1.

Fig. 11 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 5 from C1 to C1 in fig. 1. Fig. 11 (b) is a sectional view A1-A1 of fig. 1 of a rotor end 3A according to embodiment 5.

As shown in fig. 11 (a), the rotor center portion 3C according to embodiment 5 has the same structure as the rotor center portion 3C according to embodiment 4. That is, in the circumferential direction D3, the magnetic pole PA1 as the magnetic pole of the N pole and the magnetic pole PA2 as the magnetic pole of the S pole formed by the core magnetic pole portion 38C are alternately arranged by the pair of permanent magnets 32 arranged in a V-shape so that the N pole faces the outside in the radial direction D2.

As shown in fig. 11 (b), the rotor end 3A according to embodiment 5 has the same structure as the rotor end 3A according to embodiment 2. That is, the 4 core magnetic pole portions 35A forming the magnetic pole PA2 are provided at positions corresponding to the magnetic pole PC2 of the rotor center portion 3C in the circumferential direction D3. The 4 slit portions 36A forming the magnetic pole PA1 are provided at positions corresponding to the magnetic pole PC1 of the rotor center portion 3C in the circumferential direction D3.

Fig. 12 (a) is a cross-sectional view of the rotor center portion 3C according to embodiment 5 from C2 to C2 in fig. 3. Fig. 12 (b) is a sectional view A2-A2 in fig. 3 of a rotor end 3A according to embodiment 5. In fig. 12 (a), the arrow indicated by the two-dot chain line indicates the flow of the three-phase magnetic flux MF2, and the arrow indicated by the broken line indicates the magnet magnetic flux MF3. In fig. 12 (b), the solid-line arrow indicates the excitation magnetic flux MF1, and the two-dot chain arrow indicates the three-phase magnetic flux MF2.

As shown in fig. 12 (a), in the rotor center portion 3C, the magnet flux MF3 generated by the permanent magnet 32 in the magnetic pole PC1 flows from inside to outside in the radial direction D2. In the rotor center portion 3C, the three-phase magnetic flux MF2 from the stator 4 flows through the outer peripheral portion of the magnetic pole PA1 in the rotor core center portion 31C. As a result, a rotational torque can be generated in the rotor center portion 3C by the magnet torque generated by the magnet flux MF3 and the reactive torque generated by the three-phase flux MF2.

On the other hand, as shown in fig. 12 (b), at the rotor end portion 3A, the excitation magnetic flux MF1 from the stator 4 flows from the outside toward the inside in the radial direction D2 at the core magnetic pole portion 35A of the rotor core end portion 31A. In the rotating electrical machine 1 according to embodiment 5, as shown in fig. 12 (b), since the permanent magnet 32 is not provided at the rotor end portion 3A of the rotor 3, it is possible to suppress the phenomenon in which the excitation magnetic flux MF1 and the magnet magnetic flux MF3 interfere with each other and the excitation magnetic flux MF1 and the magnet magnetic flux MF3 cancel each other out and decrease. Therefore, the rotational torque based on the excitation magnetic flux MF1 can be efficiently generated at the rotor end 3A. In addition, in the rotor end portion 3B as well, the reduction of the excitation magnetic flux MF1 can be suppressed, and the rotational torque due to the excitation magnetic flux MF1 can be efficiently generated.

In addition, at the rotor core end 31A, the magnetic resistance in the core magnetic pole portion 35A forming the magnetic pole PA2 is smaller than the magnetic resistance in the slit portion 36A forming the magnetic pole PA 1. Therefore, the excitation magnetic flux MF1 easily flows in the rotor core end portion 31A from the outside toward the inside in the radial direction D2 via the core magnetic pole portion 35A forming the magnetic pole PA 2.

As a result, a part of the magnet flux MF3 flowing from the inside to the outside in the radial direction D2 in the magnetic pole PA1 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 flowing from the outside to the inside in the radial direction D2 in the magnetic pole PA2 of the rotor core end portion 31A, and the part of the magnet flux MF3 and the excitation flux MF1 can be suppressed from canceling each other and reducing. In addition, a part of the magnet flux MF3 of the rotor center portion 3C is less likely to interfere with the excitation flux MF1 of the rotor end portion 3B, similarly to the excitation flux MF1 of the rotor end portion 3A, and a reduction in the excitation flux can be suppressed. Therefore, in the rotating electrical machine 1 according to embodiment 5, the rotational torque based on the magnet magnetic flux MF3 can be efficiently generated in the rotor center portion 3C. Further, since the excitation magnetic flux MF1 of the rotor end portions 3A and 3B can be suppressed from interfering with a part of the magnet magnetic flux MF3 of the rotor center portion 3C to be reduced, the rotational torque due to the excitation magnetic flux MF1 can be generated more efficiently at the rotor end portions 3A and 3B.

In the rotating electrical machine 1 according to embodiment 5, the exciting magnetic flux MF1 and the magnet magnetic flux MF3 between the rotor 3 and the stator 4 can be reduced, and the efficiency of the rotating electrical machine 1 can be suppressed from being reduced.

In addition, at the rotor end 3A, the three-phase magnetic flux MF2 from the stator 4 flows between the rotor core end 31A and the slit 361A, between the slit 361A and the slit 361b, and between the slit 361b and the slit 361c in the slit portion 36A of the rotor core end 31A. As a result, the reactive torque generated by the three-phase magnetic flux MF2 can generate a rotational torque at the rotor end 3A, and the efficiency of the rotating electrical machine 1 can be improved.

Claims

1. A rotating electrical machine (1) is provided with:

a rotation shaft member (2) rotatable about an axis;

a rotor (3) fixed to the rotary shaft member, the rotor having a rotor core formed in a circular shape by stacking a plurality of soft magnetic plates in an axial direction of the rotary shaft member, wherein a plurality of permanent magnets are provided in a circumferential direction of the rotor core, and a magnetic pole of an N pole and a magnetic pole of an S pole are alternately formed;

a stator (4) which is disposed at intervals in a radial direction which is a direction orthogonal to the axial direction of the rotary shaft member with respect to the rotor, and which has a stator core formed in a circular shape by stacking a plurality of soft magnetic plates in the axial direction, wherein a stator coil is provided to the stator core; and

An exciting coil (6) which is disposed on the outer side of the rotor and the stator core with respect to the axial direction and generates exciting magnetic flux between the rotor core and the stator core by energization,

the rotating electrical machine (1) is characterized in that,

in the rotor, rotor end parts (3A, 3B) which are end parts on the exciting coil (6) side in the axial direction are provided with a smaller number of permanent magnets (32) than a rotor central part (3C) which is a central part in the axial direction in the rotor, or the permanent magnets (32) are not provided,

in the rotor center portion (3C), the radial direction of the magnet flux generated by the permanent magnet (32) is the same as the radial direction of the exciting flux between the rotor core and the stator core in one of the magnetic poles of the N pole and the magnetic poles of the S pole, and the radial direction of the magnet flux is opposite to the radial direction of the exciting flux between the rotor core and the stator core in the other magnetic pole,

at the rotor end portion, the magnetic resistance in the radial direction at a position corresponding to the one magnetic pole of the rotor center portion in the circumferential direction is smaller than the magnetic resistance in the radial direction at a position corresponding to the other magnetic pole of the rotor center portion in the circumferential direction.

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

the permanent magnets are provided in the rotor center portion in the one magnetic pole and the other magnetic pole, respectively.

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

the permanent magnet is not provided in one of the magnetic poles at the rotor center, and the permanent magnet is provided in the other magnetic pole.

4. A rotary electric machine according to any one of claims 1 to 3, characterized in that,

the rotor core at the rotor end portion has a shape in which the ease of flow of the excitation magnetic flux in the radial direction differs between a position corresponding to the one magnetic pole at the rotor center portion in the circumferential direction and a position corresponding to the other magnetic pole at the rotor center portion in the circumferential direction.

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

the permanent magnets are not provided at the rotor ends,

in the rotor core at the rotor end portion, a notched portion recessed from the outer side toward the inner side in the radial direction is provided at an outer peripheral portion of a position corresponding to the other magnetic pole of the rotor center portion in the circumferential direction.

6. The rotating electrical machine according to claim 4, wherein,

the permanent magnets are not provided at the rotor ends,

in the rotor core at the rotor end portion, a void portion is provided at a position corresponding to the other magnetic pole of the rotor center portion in the circumferential direction.

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

the void part is a slit forming a concave arc from the outer side to the inner side in the radial direction,

in the rotor core in the rotor end portion, a plurality of the slits are provided at intervals in the radial direction.

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

the permanent magnet is provided at the rotor end portion at a position corresponding to the other magnetic pole of the rotor center portion in the circumferential direction, and the permanent magnet is not provided at a position corresponding to the one magnetic pole of the rotor center portion in the circumferential direction.

9. The rotating electrical machine according to any one of claims 1, 2, 3, 5, 6, 7,

the exciting magnetic flux flows in the radial direction from the stator core toward the rotor core,

The one magnetic pole is the magnetic pole of the S-pole, and the other magnetic pole is the magnetic pole of the N-pole.

10. The rotating electrical machine according to any one of claims 1, 2, 3, 5, 6, 7,

an excitation yoke is provided on the outer side of the rotor and the stator in the axial direction,

the exciting coil is wound around the exciting yoke.