Rotor of rotating electric machine and

Abstract

A rotor of a rotating electrical machine in which a plurality of blocks are stacked in the axial direction, each of the blocks having a plurality of magnet holes and magnets inserted into the magnet holes to form magnetic poles, the magnet holes holding the magnets obliquely with respect to the d-axis of the magnetic poles, and the plurality of blocks having through-holes between the magnetic poles, the through hole has a set of first edges extending in the radial direction, respectively, a second edge extending in the circumferential direction on the inner side in the radial direction, and a protruding portion protruding from the second edge toward the outer side in the radial direction, and the first edges are formed along the edges of the inner sides in the radial direction of the magnet holes adjacent in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a rotor of a rotating electric machine and a rotating electric machine. Background Art In the rotor of a rotating electric machine, as a measure against torque pulsation, there is a rotor that is skewed in order to tilt the magnetic circuit in the axial direction. In order to achieve the skew structure, a through hole for circumferential positioning is sometimes provided in the rotor core. As an example of such a through hole in a rotor, Patent Document 1 discloses a structure of an electric motor having a multi-stage skew structure in which the through hole is provided as a positioning hole. Prior art literature Patent Literature

[0003] Patent Document 1: International Publication No. 2019 / 073579 Summary of the invention Problem that the invention aims to solve

[0004] In the configuration described in Patent Document 1, since the shape of the through hole provided as the positioning hole is not optimized in each stage, when the rotation speed of the rotor increases, the maximum principal stress of the rotor core generated by the centrifugal force may exceed the material strength of the electromagnetic steel sheet as the core material, and thus cannot cope with high-speed rotation. The present invention has been made in view of the above-mentioned problems, and its object is to provide a rotor of a rotating electric machine that achieves both torque pulsation reduction and stress optimization. Technical means of solving problems

[0005] A rotor of a rotating electric machine, which has a plurality of blocks stacked in the axial direction, each of the plurality of blocks having a plurality of magnet holes and magnets inserted into the magnet holes to form magnetic poles, the magnet holes holding the magnets at an angle relative to the d-axis of the magnetic poles, the plurality of blocks having through holes between the magnetic poles, the through holes having a group of first edges extending in the radial direction, a second edge extending in the circumferential direction on the radial inner side, and a protrusion protruding from the second edge to the radial outer side, the first edge being formed along the radial inner edge of the magnet hole adjacent in the circumferential direction. Effects of the Invention

[0006] According to the present invention, it is possible to provide a rotor for a rotating electrical machine that achieves both torque ripple reduction and stress optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a diagram of the overall structure of a rotating electrical machine. Figure 2 This is an explanatory diagram of a rotor according to an embodiment of the present invention. Figure 3 It is an explanatory diagram of a through hole of each block of a rotor according to an embodiment of the present invention. Figure 4 yes Figure 3 Detailed description of the through hole. DETAILED DESCRIPTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following descriptions and drawings are examples for illustrating the present invention, and appropriate omissions and simplifications have been made for the purpose of clarifying the description. The present invention may also be implemented in various other ways. Unless otherwise specified, each constituent element may be singular or plural.

[0009] In order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

[0010] (One embodiment and overall structure of the present invention) ( Figure 1 ) Figure 1 This is a simplified cross-sectional view of the rotary electric machine of the present invention. In addition, the upper side across the shaft 7 is a cross-sectional view, and the lower side is a side view. In addition, the arrow r is the rotation direction, and the arrow z is the axial direction. In addition, the left side of the figure is the front side.

[0011] The rotating electric machine 3 has a rotor 12 and a stator 13. The rotating electric machine 3 is accommodated in a housing 11 composed of a front bracket 8, a rear bracket 9, and a casing 10. The casing 11 may be an integrated housing 11 composed of the front bracket 8 and the casing 10, or may be an integrated housing 11 composed of the rear bracket 9 and the casing 10.

[0012] The stator 13 is fixed at a position where its outer circumference is opposite to the inner circumference of the housing 10. The rotor 12 is arranged to be opposite to the inner circumference of the stator 13 with a predetermined gap therebetween. The rotor 12 is fixed to the shaft 7 and rotates integrally with the shaft 7. Both ends of the shaft 7 are rotatably supported by bearings 14a and 14b provided on the front bracket 8 and the rear bracket 9, respectively.

[0013] ( Figure 2 ) Figure 2 (a) is an overall stereogram of the rotor 12, Figure 2 (b) is observed from the R direction Figure 2 The rotor 12 includes a plurality of magnet holes 15 and magnets (not shown) inserted into the magnet holes 15 to form magnetic poles. In the plurality of blocks 5 stacked in the axial direction and made of steel plates, the magnets inserted into the magnet holes 15 are held tilted relative to the d-axis 3a to form magnetic poles.

[0014] The rotor 12 has a through hole 4 disposed on the outer circumferential side of the rotor 12. The through hole 4 is used for positioning the block 5 in the rotor core in the circumferential direction. The through hole 4 has a triangular shape that has a stress reduction effect.

[0015] In the rotor 12, the plurality of blocks 5a to 5c are stacked in a skewed manner. This makes it possible to suppress torque ripple. The through holes 4 for achieving the skew of the plurality of blocks 5a to 5c will be described in detail later.

[0016] ( Figure 3 ) Figure 3 (a)~ Figure 3 (c) is a diagram for explaining the through holes 4 formed on the blocks 5a to 5c, respectively. The through holes 4 include: through holes 4a formed on the blocks 5a arranged at the two end portions among the stacked multiple blocks 5, through holes 4c formed on the blocks 5c arranged at the center portion among the stacked multiple blocks 5, and through holes 4b formed on the blocks 5b between the blocks 5a arranged at the two end portions and the block 5c arranged at the center portion. The stacked blocks 5a to 5c are positioned in the circumferential direction by the through holes 4a to 4c formed in this way by a positioning fixture or the like, thereby achieving skew. In addition, according to the defined relationship, the order is the first block 5a and the first through hole 4a, the second block 5c and the second through hole 4c, and the third block 5b and the third through hole 4b, but it is not limited to this.

[0017] ( Figure 4 ) Figure 4 (a) is an explanatory diagram of a block 5c for explaining an example of a through hole 4 formed in a block 5, Figure 4 (b) is Figure 4 The enlarged view of (a) Figure 4 (c) is an illustration of the through hole 4b formed on the block 5b. Figure 4 The explanatory diagram of the through hole 4c of the block 5c shown in (a) becomes an explanatory diagram of the through hole 4a of the block 5a if the shape is reversed left and right.

[0018] Each of the blocks 5a to 5c includes a through hole 4 between the magnetic poles, and the through hole 4 has a set of first edges 21 extending in the radial direction, a second edge 22 extending in the circumferential direction on the radial inner side, and a protrusion 20 protruding radially outward from the second edge 22. The position of the protrusion 20 in the circumferential direction relative to the d-axis 3a is different in each of the through holes 4a to 4c.

[0019] The rotary electric machine 3 has a first through hole 4a formed on one of the plurality of blocks 5a to 5c, and a second through hole 4b formed on another of the plurality of blocks 5a to 5c. The first through hole 4a and the second through hole 4b have different shapes. The number of protrusions 20 formed in the first through hole 4a and the second through hole 4b is different. The second through hole 4b has an advantage of being able to be freely positioned in the circumferential direction and achieve skewness by having a plurality of protrusions 20, compared with a case where only one protrusion 20 is provided, without relying on a single side of the through hole.

[0020] The through hole 4 has a first arc 23 formed radially outward and a second arc 24 formed radially inward of the first arc 23. The first edge 21 is formed between the first arc 23 and the second arc 24. The second edge 22 is formed between the two second arcs 24.

[0021] The circumferential position of the protrusion 20 in the through hole 4a at the second edge 22 is different in the first through hole 4a and the second through hole 4b, respectively. In addition, the protrusion 20 is formed at a position close to one of the second arcs 24 formed in the circumferential direction. In addition, unlike the through hole 4a, the protrusion 20 in the through hole 4c is formed at a position close to the other of the two second arcs 24 that is different from the second arc 24 formed at the position close to the protrusion 20 in the through hole 4a. The protrusion 20 of the through hole 4b in the block 5b is formed at two locations, and the distances to the two second arcs 24 are the same. In addition, in the through hole 4b, as Figure 4 As shown in (c), the two protrusions 20 are formed so as to sandwich the second edge 22.

[0022] The through hole 4 has a positioning space 26 defined by the first edge 21, the second edge 22, and the edge 20a formed by the protrusion 20. The positioning space 26 is a space through which the above-mentioned positioning fixture or the like is inserted, and is continuously at the same position from one end face to the other end face of the stacked multiple blocks 5a to 5c. In this way, by having a through hole 4, the protrusion 20 is provided in the through hole 4 formed in a triangular shape by the first edge 21 and the second edge 22, and the through hole 4 has a positioning space 26 continuously formed at the same position, so that it is possible to take into account both maintaining the core rotation strength by reducing the stress below the material strength and suppressing the angular deviation when positioning the rotor core in the circumferential direction. In addition, by using the protrusion 20 to assemble the rotor core with high precision, the assembly accuracy of the skew can be ensured, and the equivalence of the magnetic circuits of each cross section of the skew can be ensured.

[0023] The first edges 21 of the through holes 4a to 4c are formed parallel to the radially inner edges 15a of the magnet holes 15 formed in a circumferential arrangement. In addition, the distances 25 from the first edges 21 to the edges 15a of the through holes 4a to 4c are the same. In this way, in each block 5, the relative positions of the through holes 4 with respect to the edges 15a are the same, so that the magnetic circuits are the same, and torque ripple can be effectively reduced.

[0024] According to one embodiment of the present invention described above, the following effects are achieved.

[0025] (1) A rotor of a rotating electric machine, wherein a plurality of blocks are stacked in the axial direction, each of the plurality of blocks having a plurality of magnet holes 15 and magnets inserted into the magnet holes 15 to form magnetic poles, the magnet holes 15 holding the magnets at an angle relative to the d-axis 3a of the magnetic poles, and the plurality of blocks 5 having through holes 4 between the respective magnetic poles, the through holes 4 having a group of first edges 21 extending in the radial direction, a second edge 22 extending in the circumferential direction on the radial inner side, and a protrusion 20 protruding radially outward from the second edge 22. The first edge 21 is formed along the radial inner edge 15a of the magnet hole 15 adjacent in the circumferential direction. In this way, a rotor 12 of a rotating electric machine can be provided, which reduces torque ripple and achieves both stress reduction and improved productivity (improved assembly) in accordance with the high rotation speed.

[0026] (2) The protrusion 20 includes a first through hole 4a formed in one of the blocks 5a to 5c and a second through hole 4b formed in another of the blocks. The first through hole 4a and the second through hole 4b have different shapes. In this way, the skew is achieved.

[0027] (3) The protrusion 20 includes a first through hole 4a formed in one of the plurality of blocks and a second through hole 4b formed in another of the plurality of blocks. The position of the protrusion 20 in the circumferential direction of the second edge 22 is different in the first through hole 4a and the second through hole 4b. In this way, the skew is achieved.

[0028] (4) The protrusion 20 includes a first through hole 4a formed in one of the plurality of blocks and a second through hole 4b formed in another of the plurality of blocks. The number of protrusions 20 formed in the first through hole 4a and the number of protrusions 20 formed in the second through hole 4b are different. In this way, skew can be achieved.

[0029] (5) The through hole 4 has a positioning space 26 defined by the first edge 21, the second edge 22, and the edge of the protrusion 20. In the stacked plurality of blocks 5a to 5c, each positioning space 26 is continuous and at the same position from one axial end face to the other end face. In this way, the stacked blocks 5a to 5c are positioned in the circumferential direction by a positioning jig or the like and are skewed, thereby achieving both reduction of torque ripple and improvement of productivity.

[0030] (6) The protrusion 20 includes a first through hole 4a formed in one of the plurality of blocks, and a second through hole 4b formed in another of the plurality of blocks. In the first through hole 4a and the second through hole 4b, the distance 25 from the first edge 21 to the edge 15a is the same. In this way, since the relative position of the through hole 4 with respect to the edge 15a is the same, the magnetic paths of the skewed blocks 5a to 5c are made the same, and thus the torque ripple can be effectively reduced.

[0031] (7) The protrusion 20 includes a first through hole 4a formed in a predetermined block among the plurality of blocks and a second through hole 4b formed in another block among the plurality of blocks. In the first through hole 4a and the second through hole 4b, each first edge 21 is parallel to the radial inner edge 15a of the magnet hole 15. In this way, since the relative position of the through hole 4 with respect to the edge 15a is the same, the magnetic circuits of the skewed blocks 5a to 5c are made the same, and thus the torque ripple can be effectively reduced.

[0032] (8) The through holes 4 include through holes 4a formed in blocks 5a disposed at both ends of the stacked blocks 5, through holes 4c formed in blocks 5c disposed at the center of the stacked blocks 5, and through holes 4b formed in blocks 5b between the blocks 5a disposed at both ends and the block 5c disposed at the center. The blocks 5a to 5c are skewed by being positioned in the circumferential direction by the through holes 4a to 4c. In this way, the assembly accuracy of the skew can be ensured.

[0033] (9) The position of the protrusion 20 relative to the d-axis 3a in the circumferential direction is different in the through hole 4a, the through hole 4c, and the through hole 4b. In this way, the stacked blocks 5a to 5c are skewed, and stress reduction and torque ripple reduction can be achieved at the same time.

[0034] (10) The rotating electric machine 3 includes: a rotor 12 having the features of the present invention; and a stator 13 facing the rotor 12 with a predetermined gap therebetween. Thus, it is possible to provide a rotating electric machine 3 that can reduce torque ripple and achieve both stress reduction and productivity improvement.

[0035] In addition, the present invention is not limited to the above-mentioned embodiment, and various modifications and other configurations can be combined within the scope of the gist thereof. In addition, the present invention is not limited to having all the configurations described in the above-mentioned embodiment, and also includes a configuration in which a part of the configuration is deleted. Explanation of symbols

[0036] 3 Rotating motor 3a d axis 4 Through holes for positioning 5 pieces 7 Axis 8 Front bracket 9 Rear bracket 10 Housing 11. Housing 12 Rotor 13. Stator 14a, 14b bearings 15 Magnet hole 15a Radially inner edge 20 Protrusion 20a Edge of the protrusion 21 First Edge 22 The Second Edge 23 First arc 24 Second arc 25 Distance between the first edge and the edge on the inner circumference of the magnet hole 26 Positioning space.

Claims

1. A rotor of a rotating electric machine, wherein a plurality of blocks are stacked in an axial direction, each of the plurality of blocks having a plurality of magnet holes and magnets inserted into the magnet holes to form magnetic poles, wherein the rotor of the rotating electric machine is characterized in that: The magnet hole holds the magnet in a manner tilted relative to the d-axis of the magnetic pole. The plurality of blocks include through holes between the magnetic poles, the through holes having a group of first edges extending in the radial direction, a second edge extending in the circumferential direction on the radial inner side, and a protrusion protruding from the second edge to the radial outer side. The first edge is formed along radially inner edges of the magnet holes adjacent to each other in the circumferential direction.

2. The rotor of a rotating electrical machine according to claim 1, characterized in that: The protrusion includes: a first through hole formed in one of the plurality of blocks; and a second through hole formed in another block among the plurality of blocks, The first through hole and the second through hole have different shapes, respectively.

3. The rotor of a rotating electrical machine according to claim 1, characterized in that: The protrusion includes: a first through hole formed in one of the plurality of blocks; and a second through hole formed in another block among the plurality of blocks, The circumferential position of the protrusion on the second edge is different in the first through hole and the second through hole.

4. The rotor of a rotating electrical machine according to claim 1, characterized in that: The protrusion includes: a first through hole formed in one of the plurality of blocks; and a second through hole formed in another block among the plurality of blocks, The number of the protrusions formed in the first through hole and the number of the protrusions formed in the second through hole are different.

5. The rotor of a rotating electrical machine according to claim 1, characterized in that: The through hole has a positioning space defined by the first edge, the second edge, and the edge of the protruding portion. In the plurality of stacked blocks, each of the positioning spaces is continuously located at the same position from one end surface to the other end surface in the axial direction.

6. The rotor of a rotating electrical machine according to claim 1, characterized in that: The protrusion includes: a first through hole formed in one of the plurality of blocks; and a second through hole formed in another block among the plurality of blocks, In the first through hole and the second through hole, the distance from the first edge to the radial inner edge is the same.

7. The rotor of a rotating electrical machine according to claim 1, characterized in that: The protrusion includes: a first through hole formed in a predetermined block among the plurality of blocks; and a second through hole formed in another block among the plurality of blocks, In the first through hole and the second through hole, each of the first edges is formed parallel to the radial inner edge of the magnet hole.

8. The rotor of a rotating electrical machine according to claim 1, characterized in that: The through holes include: a first through hole formed in a first block disposed at both ends of the stacked blocks; a second through hole formed in a second block disposed at a center of the stacked blocks; and a third through hole formed in a third block disposed between the first block disposed at both ends and the second block disposed at the center. The plurality of blocks are skewed by being positioned in the circumferential direction by the first through-hole, the second through-hole, and the third through-hole.

9. The rotor of a rotating electrical machine according to claim 1, characterized in that: The position of the protrusion in the circumferential direction relative to the d-axis is different in the first through hole, the second through hole, and the third through hole.

10. A rotating electrical machine, characterized in that: have: A rotor according to any one of claims 1 to 6, and a stator facing the rotor with a predetermined gap therebetween.

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