Rotor and rotating electric machine

Abstract

A rotor of a rotary electrical machine in which a plurality of blocks are layered in the axial direction, each of the blocks being provided with a plurality of magnet holes and magnets that are inserted into the magnet holes to form magnetic poles, wherein: the magnet holes retain the magnets so as to be inclined relative to a d-axis of the magnetic poles; between each of the magnetic poles, the plurality of blocks are provided with a through-hole having a set of first edges that extend in the radial direction, a second edge that extends in the circumferential direction on the radially inner side, and a protrusion that protrudes radially outward from the second edge; and the first edges are formed along the radially inner edge of the magnet holes that are adjacent to each other in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a rotor of a rotating electrical machine and a rotating electrical machine.

Background Art

[0002] Some rotors of rotating electrical machines perform skewing to make the magnetic circuit oblique in the axial direction as a countermeasure against torque ripple. Due to the configuration of the skewing, some rotor cores are provided with through holes used for circumferential positioning. As an example of such a through hole of a rotor, Patent Document 1 discloses a configuration of a motor having a through hole provided as a positioning hole and a multi-stage skewing structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration described in Patent Document 1, since the shapes of the through holes provided as positioning holes are not optimized in each stage, when the rotational speed of the rotor increases, the maximum principal stress of the rotor core generated by centrifugal force may exceed the material strength of the electromagnetic steel sheet, which is the core material. Therefore, it cannot cope with high-speed rotation. The present invention has been made in view of the above problems, and an object thereof is to provide a rotor of a rotating electrical machine that achieves both torque ripple reduction and stress optimization.

Means for Solving the Problems

[0005] The rotor of the rotating electric machine according to the present invention is A plurality of blocks each including a plurality of magnet holes and magnets inserted into the magnet holes to form magnetic poles are laminated in the axial direction thingThe magnet hole holds the magnet at an inclination with respect to the d-axis of the timepiece, and the plurality of blocks each have a through hole between each magnetic pole having a pair of first edges extending radially, a second edge extending circumferentially on the radially inward side, and a projection protruding radially outward from the second edge. each The first edge is formed along the radially inward edge of the circumferentially adjacent magnet hole. The through-hole includes a first through-hole formed in one of the plurality of blocks and a second through-hole formed in another of the plurality of blocks, wherein the circumferential position or number of the protrusions in the first through-hole and the circumferential position or number of the protrusions in the second through-hole are different from each other. . [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a rotor for a rotating electric machine that achieves both torque ripple reduction and stress optimization. [Brief explanation of the drawing]

[0007] [Figure 1] Overall configuration diagram of a rotating electric machine [Figure 2] Diagram illustrating the rotor in one embodiment of the present invention. [Figure 3] Diagram illustrating the through-holes in each block of a rotor according to one embodiment of the present invention. [Figure 4] Detailed diagram of the through hole in Figure 3.

[0008] Embodiments of the present invention will be described below with reference to the drawings. The following description and drawings are illustrative for illustrating the present invention, and have been omitted and simplified as appropriate for clarity of explanation. The present invention can also be carried out in various other forms. Unless otherwise specified, each component may be singular or plural.

[0009] The positions, sizes, shapes, and ranges of the components shown in the drawings may not represent their actual positions, sizes, shapes, and ranges in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the positions, sizes, shapes, and ranges disclosed in the drawings.

[0010] (One embodiment of the present invention and its overall configuration) (Figure 1) Figure 1 is a simplified cross-sectional view of the rotating electric machine of the present invention. The upper side of the shaft 7 is shown as a cross-sectional view, and the lower side is shown as a side view. The arrow r indicates the direction of rotation, and the arrow z indicates the axial direction. The left side of the drawing is the front side.

[0011] The rotating electric machine 3 comprises a rotor 12 and a stator 13. The rotating electric machine 3 is housed inside a case 11, which consists of a front bracket 8, a rear bracket 9, and a housing 10. The case 11 may be an integrated case 11 consisting of the front bracket 8 and the housing 10, or an integrated case 11 consisting of the rear bracket 9 and the housing 10.

[0012] The stator 13 is fixed in a position where its outer circumference faces the inner circumference of the housing 10. The rotor 12 is positioned to face the inner circumference of the stator 13 with a predetermined gap between them. 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 perspective view of the rotor 12, and Figure 2(b) is a view of Figure 2(a) from the R direction. The rotor 12 comprises a plurality of magnet holes 15 and magnets (not shown) inserted into the magnet holes 15 to form magnetic poles. In a plurality of blocks 5 made of steel plates stacked in the axial direction, the magnets inserted into the magnet holes 15 are held at an inclination with respect to the d-axis 3a, each forming a magnetic pole.

[0014] The rotor 12 has through holes 4 on its outer circumference, which are used for circumferential positioning of the block 5 in the rotor core. The through holes 4 have a triangular shape that has a stress-reducing effect.

[0015] In the rotor 12, a plurality of blocks 5a to 5c are skewed and laminated. Thereby, suppression of torque ripple can be realized. Details of the through hole 4 that realizes the skew of the plurality of blocks 5a to 5c will be described later.

[0016] (Fig. 3) Figs. 3(a) to 3(c) are diagrams for explaining the through holes 4 formed in the blocks 5a to 5c, respectively. The through hole 4 includes a through hole 4a formed in the block 5a disposed at both ends in the plurality of laminated blocks 5, a through hole 4c formed in the block 5c disposed at the center in the plurality of laminated blocks 5, and a through hole 4b formed in the block 5b disposed between the block 5a disposed at both ends and the block 5c disposed at the center. The laminated blocks 5a to 5c are positioned in the circumferential direction through the positioning jig or the like in the through holes 4a to 4c formed in this way, thereby realizing skew. Note that, due to the definition relationship, it is in the order of 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 thereto.

[0017] (Fig. 4) Fig. 4(a) is an explanatory diagram of the block 5c for explaining an example of the through hole 4 formed in the block 5, Fig. 4(b) is an enlarged view of Fig. 4(a), and Fig. 4(c) is an explanatory diagram of the through hole 4b formed in the block 5b. Note that the explanatory diagram of the through hole 4c of the block 5c shown in Fig. 4(a) becomes an explanatory diagram of the through hole 4a of the block 5a when the shape is reversed left and right.

[0018] The blocks 5a to 5c each have a through hole 4 having a set of first edges 21 extending in the radial direction, second edges 22 extending in the circumferential direction on the inner side in the radial direction, and a protruding portion 20 protruding from the second edge 22 to the outside in the radial direction, provided between the magnetic poles. The position of the protruding portion 20 with respect to the d-axis 3a in the circumferential direction is different in each of the through holes 4a to 4c.

[0019] The rotating electrical machine 3 has a first through-hole 4a formed in one of the plurality of blocks 5a to 5c, and a second through-hole 4b formed in another one of the plurality of blocks 5a to 5c. The first through-hole 4a and the second through-hole 4b have different shapes respectively. The number of protrusions 20 formed in the first through-hole 4a and the second through-hole 4b is different respectively. By having a plurality of protrusions 20, the second through-hole 4b has the merit that it can be freely positioned in the circumferential direction regardless of one side of the through-hole and realize skew, compared with the case of having only one protrusion 20.

[0020] The through-hole 4 has a first arc 23 formed on the radially outer side, and a second arc 24 formed on the radially inner side than 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 two second arcs 24.

[0021] The circumferential position of the protrusion 20 in the through-hole 4a is different between the first through-hole 4a and the second through-hole 4b. Also, the protrusion 20 is formed at a position close to one of the two second arcs 24 formed side by side in the circumferential direction. Also, different from the through-hole 4a, the protrusion 20 in the through-hole 4c is formed at a position close to the other second arc 24, which is different from the one second arc 24 close to the protrusion 20 of the through-hole 4a. Two protrusions 20 are formed in the through-hole 4b in the block 5b, and the distances to the two second arcs 24 are the same. In the through-hole 4b, as shown in Fig. 4(c), the two protrusions 20 are formed so as to sandwich the second edge 22 therebetween.

[0022] The through-hole 4 has a positioning space 26 defined by a first edge 21, a second edge 22, and an edge 20a formed by the protrusion 20. This positioning space 26 is the space through which the aforementioned positioning jig, etc., is inserted, and it is in the same position continuously from one end face to the other end face of the multiple stacked blocks 5a to 5c. In this way, by providing a through-hole 4 that has a protrusion 20 in a triangular shape formed by the first edge 21 and the second edge 22, and a positioning space 26 that is continuously formed in the same position, it is possible to maintain core rotation strength by reducing stress below the material strength and suppress angular displacement when the rotor core is positioned in the circumferential direction. Furthermore, by assembling the rotor core with high precision using this protrusion 20, the assembly accuracy of the skew can be ensured, and the equivalence of the magnetic circuits of each skewed cross-section 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, which are arranged circumferentially. Furthermore, the distance 25 from the first edge 21 to the edge 15a is the same for all through holes 4a to 4c. In this way, the relative positions of the through holes 4 with respect to the edge 15a are the same in each block 5, resulting in similar magnetic paths and effectively reducing torque ripple.

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

[0025] (1) A rotor for a rotating electric machine is provided, in which multiple blocks are stacked in the axial direction, each having multiple magnet holes 15 and magnets inserted into the magnet holes 15 to form magnetic poles, wherein the magnet holes 15 hold the magnets at an inclination with respect to the d-axis 3a of the magnetic poles, and each of the multiple blocks 5 has a through hole 4 between each magnetic pole, each having a pair of first edges 21 extending radially, a second edge 22 extending circumferentially on the radially inward side, and a projection 20 projecting radially outward from the second edge 22. The first edges 21 are formed along the radially inward edge 15a of adjacent magnet holes 15 in the circumferential direction. In this way, a rotor 12 for a rotating electric machine can be provided that reduces torque ripple and achieves both stress reduction and productivity improvement (improved assembly) in response to high rotational speeds.

[0026] (2) The protruding portion 20 has 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. This is how skew is achieved.

[0027] (3) The protruding portion 20 has a first through hole 4a formed in one of the blocks and a second through hole 4b formed in another of the blocks. The circumferential positions of the first through hole 4a and the second through hole 4b at the second edge 22 of the protruding portion 20 are different. This is how skew is achieved.

[0028] (4) The protruding portion 20 has a first through hole 4a formed in one of the blocks and a second through hole 4b formed in another of the blocks. The number of first through holes 4a and second through holes 4b in the protruding portion 20 is different. This makes it possible to achieve skew.

[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 protruding portion 20, and in the stacked blocks 5a to 5c, each positioning space 26 is in the same position continuously from one end face to the other in the axial direction. In this way, the stacked blocks 5a to 5c that are positioned in the circumferential direction by a positioning jig or the like are skewed, making it possible to achieve both torque ripple reduction and improved productivity.

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

[0031] (7) The protruding portion 20 has 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, the first edges 21 of each are parallel to the radially inner edge 15a of the magnet hole 15. In this way, the relative position of the through hole 4 with respect to the edge 15a is the same, and by making the magnetic paths of each of the skewed blocks 5a to 5c the same, torque ripple can be effectively reduced.

[0032] (8) The through-holes 4 include through-holes 4a formed in blocks 5a located at both ends of the stacked blocks 5, through-holes 4c formed in block 5c located in the center of the stacked blocks 5, and through-holes 4b formed in block 5b located between the blocks 5a at both ends and the block 5c located in the center. The multiple blocks 5a to 5c are skewed by being positioned in the circumferential direction by the through-holes 4a to 4c. This ensures the assembly accuracy of the skew.

[0033] (9) The position of the protruding portion 20 relative to the d-axis 3a in the circumferential direction is different for through holes 4a, 4c, and 4b. In this way, the stacked blocks 5a to 5c are skewed, making it possible to achieve both stress reduction and torque ripple reduction.

[0034] (10) The rotating electric machine 3 comprises a rotor 12 having the features of the present invention and a stator 13 facing the rotor 12 with a predetermined air gap between them. In this way, a rotating electric machine 3 can be provided that reduces torque ripple and achieves both stress reduction and improved productivity.

[0035] It should be noted that the present invention is not limited to the embodiments described above, and various modifications and combinations of other configurations can be made without departing from the spirit of the invention. Furthermore, the present invention is not limited to having all the configurations described in the embodiments described above, and may also include configurations in which some of those configurations are omitted. [Explanation of Symbols]

[0036] 3. Rotating Electric Machines 3a d axis 4. Through holes for positioning 5 blocks 7 shafts 8 Front Bracket 9 Rear Bracket 10 Housing 11 cases 12 rotors 13 Stator 14a, 14b bearings 15 Magnetic holes 15a Radial inner edge 20 Protrusion 20a Edge of the protruding part 21 First Edge 22 Second Edge 23. First arc 24. Second Arc 25 Distance between the first edge and the edge on the inner circumference side of the magnet hole 26 Positioning space

Claims

1. A rotor for a rotating electric machine, comprising a plurality of blocks stacked axially, each having a plurality of magnet holes and a magnet inserted into the magnet holes to form a magnetic pole, The magnet hole holds the magnet at an inclination with respect to the d-axis of the magnetic pole, Each of the aforementioned blocks is provided with a through hole having, between each of the magnetic poles, a pair of first edges extending radially, a second edge extending circumferentially on the radially inward side, and a projection extending radially outward from the second edge. The first edge is formed along the radially inner edge of the circumferentially adjacent magnet hole, The through-hole includes a first through-hole formed in one of the plurality of blocks and a second through-hole formed in another of the plurality of blocks. The circumferential position of the protrusion in the first through hole and the circumferential position of the protrusion in the second through hole are different from each other. Rotor of a rotating electric machine.

2. A rotor for a rotating electric machine, comprising a plurality of blocks stacked in the axial direction, each having a plurality of magnet holes and a magnet inserted into the magnet holes to form a magnetic pole, The magnet hole holds the magnet at an inclination with respect to the d-axis of the magnetic pole, Each of the aforementioned blocks is provided with a through hole having, between each of the magnetic poles, a pair of first edges extending radially, a second edge extending circumferentially on the radially inward side, and a projection extending radially outward from the second edge. The first edge is formed along the radially inner edge of the circumferentially adjacent magnet hole, The through-hole includes a first through-hole formed in one of the plurality of blocks and a second through-hole formed in another of the plurality of blocks. The number of protrusions in the first through hole and the number of protrusions in the second through hole are different from each other. Rotor of a rotating electric machine.

3. A rotor for a rotating electric machine according to claim 1 or 2, The first through hole and the second through hole each have different shapes. Rotor of a rotating electric machine.

4. A rotor for a rotating electric machine according to claim 1 or 2, The through hole has a positioning space defined by the first edge, the second edge, and the edge of the protruding portion. In the stacked plurality of blocks, the positioning space of each block is in the same position continuously from one end face in the axial direction to the other end face. Rotor of a rotating electric machine.

5. A rotor for a rotating electric machine according to claim 1 or 2, In the first through-hole and the second through-hole, the distance from the first edge to the radially inner edge of the magnet hole is the same. Rotor of a rotating electric machine.

6. A rotor for a rotating electric machine according to claim 1 or 2, In the first through-hole and the second through-hole, the first edge of each is formed parallel to the radially inner edge of the magnet hole. Rotor of a rotating electric machine.

7. A rotor for a rotating electric machine according to claim 1 or 2, The aforementioned through-hole includes, in addition to the first and second through-holes, a third through-hole. The first through-hole is formed in the first block located at both ends of the stacked plurality of blocks, The second through-hole is formed in the second block located in the center of the plurality of stacked blocks, The third through-hole is formed in the third block, which is positioned between the first block, which is positioned at both ends, and the second block, which is positioned in 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. Rotor of a rotating electric machine.

8. A rotor for a rotating electric machine according to claim 7, The position of the protrusion in the first through hole with respect to the d-axis in the circumferential direction is different from the position of the protrusion in the second through hole with respect to the d-axis in the circumferential direction. Rotor of a rotating electric machine.

9. A rotor according to claim 1 or 2, and a stator facing the rotor with a predetermined gap between them. Rotating electric machine.

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