Rotor of rotating electrical machine

Abstract

To provide a rotor of a rotating electrical machine that can improve the workability of attaching a plurality of magnet bodies to a rotor core.SOLUTION: A plurality of first grooves 12d are formed in the first end face 12a of a rotor core 12. A plurality of second grooves are formed in the second end face of the rotor core 12. Each pressing member 15 has a first fixing protrusion 15b inserted into the first groove 12d and a second fixing protrusion inserted into the second groove. Each pressing member 15 is guided by the first groove 12d and the second groove and is displaceable in the radial direction of the rotor core 12 between a pressing position and a release position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a rotor for a rotating electrical machine. [Background technology]

[0002] In a rotor for a conventional rotating electric machine, multiple magnet rows are attached to a rotor core by multiple fixing parts. Each fixing part has a fixing part body, multiple first pressing parts, and multiple second pressing parts. The fixing part body is disposed between two adjacent magnet rows and is fixed to the rotor core by multiple bolts.

[0003] The first pressing units press the magnets included in one of two adjacent magnet rows against the outer circumferential surface of the rotor core, while the second pressing units press the magnets included in the other of the two adjacent magnet rows against the outer circumferential surface of the rotor core (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-169833 Summary of the Invention [Problem to be solved by the invention]

[0005] In the rotors of conventional rotating electric machines described above, the multiple magnets included in the magnet rows located on both sides cannot be held down until each fixed part is completely fixed to the rotor core. For this reason, each fixed part must be fixed to the rotor core with great care to prevent the multiple magnets from falling off, which reduces workability.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a rotor for a rotating electric machine that can improve the workability of attaching multiple magnet bodies to a rotor core. [Means for solving the problem]

[0007] The rotor of the rotating electric machine according to the present disclosure comprises a cylindrical rotor core having a first end face which is one end face in the axial direction, a second end face which is the other end face in the axial direction, and an outer circumferential surface, a plurality of magnetic bodies provided on the outer circumferential surface at intervals from each other in the circumferential direction of the rotor core, and a plurality of pressing members attached to the rotor core so as to be arranged alternately with the plurality of magnetic bodies in the circumferential direction of the rotor core and pressing the plurality of magnetic bodies against the rotor core, the first end face having a plurality of first grooves extending from the outer circumferential surface toward the center of the first end face, and the second end face having a plurality of second grooves extending from the outer circumferential surface toward the center of the second end face, each pressing member having a main portion that abuts against the magnetic bodies, a first fixing protrusion inserted in the first groove, and a second fixing protrusion inserted in the second groove, and being guided by the first groove and the second groove and capable of being displaced radially of the rotor core between a pressing position and a release position, the pressing position being a position where the magnetic bodies are pressed against the rotor core, and the release position being a position radially outward of the rotor core from the pressing position. [Effects of the Invention]

[0008] According to the rotor for a rotating electric machine of the present disclosure, the workability of attaching a plurality of magnet bodies to a rotor core can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a rotor of a rotating electric machine according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing the rotor core of FIG. 1. [Figure 3] FIG. 2 is a perspective view showing the magnet piece of FIG. [Figure 4] FIG. 2 is a perspective view showing the pressing member of FIG. [Figure 5] 2 is a perspective view showing a state in which a magnet body is being attached to the rotor core of FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 Fig. 1 is a perspective view showing a rotor of a rotating electric machine according to embodiment 1. Fig. 2 is a perspective view showing a rotor core of Fig. 1.

[0011] In the figure, the rotor has a shaft 11 which is a rotation axis, a cylindrical rotor core 12, a plurality of magnet bodies 13, a plurality of pressing members 15, and a plurality of bolts 16 as fasteners.

[0012] The rotor core 12 is attached to the shaft 11. The shaft 11 passes through the center of the rotor core 12.

[0013] The rotor core 12 has a first end face 12a, a second end face 12b, and an outer peripheral surface 12c. The first end face 12a is one axial end face of the rotor core 12. The second end face 12b is the other axial end face of the rotor core 12. The axial direction of the rotor core 12 is a direction along the axis C of the rotor core 12.

[0014] A plurality of first grooves 12d are provided in the first end face 12a from the outer peripheral surface 12c toward the center of the first end face 12a. The plurality of first grooves 12d are provided radially around the axis C of the rotor core 12. That is, each of the first grooves 12d is provided along the radial direction of the rotor core 12. The radial direction of the rotor core 12 is a direction perpendicular to the axis C of the rotor core 12.

[0015] A plurality of second grooves 12e are provided in the second end face 12b from the outer circumferential surface 12c toward the center of the second end face 12b. The plurality of second grooves 12e are provided radially around the axis C of the rotor core 12. That is, each second groove 12e is provided along the radial direction of the rotor core 12.

[0016] The outer circumferential surface 12c is provided with a plurality of connecting grooves 12f extending along the axial direction of the rotor core 12. Each connecting groove 12f connects the corresponding first groove 12d and the corresponding second groove 12e.

[0017] A screw hole 12g is provided in the bottom surface of each of the first grooves 12d and the bottom surface of each of the second grooves 12e.

[0018] A plurality of end projections 12h are provided on one end of the outer peripheral surface 12c in the axial direction of the rotor core 12. A plurality of stopper projections 12i are provided on the other end of the outer peripheral surface 12c in the axial direction of the rotor core 12.

[0019] The end projections 12h and the stopper projections 12i face each other between adjacent connecting grooves 12f. The stopper projections 12i prevent the magnetic bodies 13 from falling off the rotor core 12 during the attachment of the magnetic bodies 13 to the rotor core 12.

[0020] The plurality of magnet bodies 13 are provided on the outer peripheral surface 12c at intervals from one another in the circumferential direction of the rotor core 12. The circumferential direction of the rotor core 12 is a direction along the circumference of a circle centered on the axis C of the rotor core 12.

[0021] The multiple magnet bodies 13 face the inner peripheral surface of a stator (not shown). The stator is provided with a stator coil. The stator coil generates a magnetic field when a current is passed through it. The multiple magnet bodies 13 generate a rotational force in response to the magnetic field generated by the stator coil.

[0022] Each magnet body 13 is composed of a plurality of magnet pieces 14. Each magnet piece 14 is a permanent magnet. In each magnet body 13, the plurality of magnet pieces 14 are arranged along the axial direction of the rotor core 12. In the example of FIG. 1, each magnet body 13 is composed of three magnet pieces 14.

[0023] The multiple pressing members 15 are attached to the rotor core 12 so as to be arranged alternately with the multiple magnetic bodies 13 in the circumferential direction of the rotor core 12. The multiple magnetic bodies 13 are pressed against the rotor core 12 by the multiple pressing members 15. That is, each magnetic body 13 is pressed against the rotor core 12 by a pair of pressing members 15 adjacent to both sides of the rotor core 12 in the circumferential direction.

[0024] The plurality of holding members 15 are attached to the rotor core 12 by a plurality of bolts 16 .

[0025] Fig. 3 is a perspective view showing the magnet pieces 14 of Fig. 1. A pair of magnet inclined surfaces 14a is provided on the surface of each magnet piece 14 opposite the rotor core 12. The pair of magnet inclined surfaces 14a are inclined in a tapered manner so that the distance between them becomes narrower as they move radially outward from the rotor core 12.

[0026] Both ends of each magnet piece 14 in the axial direction of the rotor core 12 are provided with chamfered portions 14b.

[0027] Fig. 4 is a perspective view showing the pressing members 15 of Fig. 1. Each pressing member 15 has a main portion 15a, a first fixing protrusion 15b, and a second fixing protrusion 15c.

[0028] The main portions 15a are arranged along the axial direction of the rotor core 12 and inserted into the corresponding connecting grooves 12f. The main portions 15a are also abutted against the magnet bodies 13 located on both sides.

[0029] The first fixing protrusions 15b protrude radially inward of the rotor core 12 from one end of the main portion 15a in the axial direction of the rotor core 12. The first fixing protrusions 15b are inserted into the corresponding first grooves 12d.

[0030] The second fixing protrusions 15c protrude radially inward of the rotor core 12 from the other end of the main portion 15a in the axial direction of the rotor core 12. The second fixing protrusions 15c are inserted into the corresponding second grooves 12e.

[0031] Each pressing member 15 is guided by the first groove 12d and the second groove 12e and is displaceable in the radial direction of the rotor core 12 between a pressing position shown in Fig. 1 and a release position shown in Fig. 5. The pressing position is a position where the main portions 15a press the magnetic bodies 13 located on both sides against the rotor core 12. The release position is a position further outward in the radial direction of the rotor core 12 than the pressing position.

[0032] As the retaining member 15 is displaced in the radial direction of the rotor core 12, the first fixing protrusion 15b is guided by the first groove 12d and slides on the first end face 12a, and the second fixing protrusion 15c is guided by the second groove 12e and slides on the second end face 12b.

[0033] An elongated hole 15d is formed in each of the first fixing protrusion 15b and the second fixing protrusion 15c of each pressing member 15. A bolt 16 is passed through each elongated hole 15d. Each bolt 16 is passed through the corresponding elongated hole 15d and screwed into the corresponding screw hole 12g.

[0034] Tightening each bolt 16 restricts displacement of each retaining member 15 in the radial direction of the rotor core 12. Loosening each bolt 16 allows displacement of each retaining member 15 in the radial direction of the rotor core 12 within the range of each elongated hole 15d.

[0035] A pair of pressing inclined surfaces 15e is provided on the main portion 15a of each pressing member 15. The pair of pressing inclined surfaces 15e are tapered so that the distance between them becomes narrower as they move radially inward of the rotor core 12. The pair of pressing inclined surfaces 15e abut against the magnet inclined surfaces 14a of the magnet pieces 14 located on both sides. That is, the pair of magnet inclined surfaces 14a of each magnet piece 14 abut against the pressing inclined surfaces 15e of the main portion 15a of the pressing members 15 located on both sides.

[0036] A plurality of positioning protrusions 15f are provided on a pair of pressing inclined surfaces 15e of each pressing member 15. The plurality of positioning protrusions 15f abut against the chamfered portions 14b of the corresponding magnet pieces 14, thereby positioning each magnet piece 14 in the axial direction of the rotor core 12.

[0037] Fig. 5 is a perspective view showing a state in the middle of attaching magnetic bodies 13 to rotor core 12 in Fig. 1. In the work of attaching multiple magnetic bodies 13 to rotor core 12, multiple pressing members 15 are first attached to rotor core 12. At this time, each pressing member 15 is attached to rotor core 12 so as to be positioned in the release position.

[0038] After this, the rotor core 12 is placed with the second end face 12b facing downwards. In this state, as shown in FIG. 5, each magnet piece 14 can be inserted between the rotor core 12 and the multiple pressing members 15 from the axial end of the rotor core 12. By inserting three magnet pieces 14 between adjacent pressing members 15, a magnetic body 13 is formed. At this time, the stopper protrusions 12i prevent each magnetic body 13 from falling off the rotor core 12.

[0039] Thereafter, while positioning each magnet piece 14 in the axial direction of the rotor core 12, each pressing member 15 is pushed into the pressing position, and each bolt 16 is tightened. As a result, each magnet body 13 is pressed against the rotor core 12 and fixed by the pressing members 15 located on both sides.

[0040] In such a rotor for a rotating electric machine, a plurality of first grooves 12d are formed in a first end face 12a of the rotor core 12. A plurality of second grooves 12e are formed in a second end face 12b of the rotor core 12. Each pressing member 15 has a first fixing protrusion 15b inserted into the first groove 12d and a second fixing protrusion 15c inserted into the second groove 12e. Each pressing member 15 is guided by the first groove 12d and the second groove 12e and is displaceable in the radial direction of the rotor core 12 between a pressing position and a release position.

[0041] This allows the multiple magnetic bodies 13 to be temporarily attached to the rotor core 12 with the multiple pressing members 15 attached to the rotor core 12. After the temporary attachment, each pressing member 15 can be displaced to the pressing position to press and fix the multiple magnetic bodies 13 to the rotor core 12.

[0042] This prevents the magnet bodies 13 from falling off the rotor core 12 during attachment, improving the workability of attaching the plurality of magnet bodies 13 to the rotor core 12.

[0043] Further, an elongated hole 15d is formed in each of the first fixing protrusion 15b and the second fixing protrusion 15c of each pressing member 15. Each pressing member 15 is displaceable in the radial direction of the rotor core 12 within the range of the elongated hole 15d.

[0044] Therefore, each pressing member 15 can be easily displaced between the pressing position and the release position, which further improves the workability of attaching the multiple magnet bodies 13 to the rotor core 12.

[0045] Each magnet piece 14 of each magnet body 13 is provided with a pair of tapered inclined magnet surfaces 14a. Each pressing member 15 has a main portion 15a with a pair of tapered inclined pressing surfaces 15e. The pair of inclined pressing surfaces 15e of each pressing member 15 abuts against the inclined magnet surfaces 14a of the magnet bodies 13 located on both sides.

[0046] This makes it possible to easily position each magnet body 13 in the circumferential direction of the rotor core 12. Also, each magnet body 13 can be pressed against the rotor core 12 more firmly.

[0047] Furthermore, a plurality of positioning protrusions 15f are provided on the main portion 15a of each pressing member 15. This makes it possible to easily position each magnet piece 14 in the axial direction of the rotor core 12.

[0048] Furthermore, a plurality of stopper projections 12i are provided at the end of the outer peripheral surface 12c in the axial direction of the rotor core 12. This more reliably prevents each magnetic body 13 from falling off the rotor core 12 while it is attached.

[0049] Each magnet body 13 may be made up of one magnet piece 14, or two or four or more magnet pieces 14.

[0050] Furthermore, the number of magnet bodies 13 and the number of pressing members 15 are not particularly limited.

[0051] The rotating electrical machine may be an electric motor, a generator, or a generator-motor.

[0052] The above describes in detail preferred embodiments, but the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0053] Various aspects of the present disclosure are summarized below as appendices.

[0054] (Appendix 1) a cylindrical rotor core having a first end face that is one end face in the axial direction, a second end face that is the other end face in the axial direction, and an outer circumferential surface; a plurality of magnet bodies provided on the outer peripheral surface of the rotor core at intervals in the circumferential direction of the rotor core; and a plurality of pressing members attached to the rotor core so as to be arranged alternately with the plurality of magnet bodies in the circumferential direction of the rotor core, and pressing the plurality of magnet bodies against the rotor core; Equipped with a plurality of first grooves are provided in the first end surface from the outer circumferential surface toward the center of the first end surface; a plurality of second grooves are provided in the second end surface from the outer circumferential surface toward the center of the second end surface; Each of the retaining members has a main portion that is brought into contact with the magnetic body, a first fixing protrusion that is inserted into the first groove, and a second fixing protrusion that is inserted into the second groove, and is guided by the first groove and the second groove and is displaceable in the radial direction of the rotor core between a retaining position and a release position, the pressing position is a position where the magnet body is pressed against the rotor core, The rotor of the rotating electric machine, wherein the release position is a position radially outward of the rotor core than the pressing position. (Appendix 2) The first fixing protrusion and the second fixing protrusion of each of the pressing members are each provided with a long hole, A fastener for attaching each of the holding members to the rotor core is passed through each of the elongated holes, 2. The rotor of a rotating electric machine according to claim 1, wherein each of the pressing members is displaceable in the radial direction of the rotor core within the range of the elongated hole. (Appendix 3) Each of the magnet bodies is provided with a pair of tapered magnet inclined surfaces against which the main portions of the pressing members located on both sides abut, A rotor for a rotating electric machine as described in Appendix 1 or Appendix 2, wherein the main portion of each pressing member is provided with a pair of tapered pressing inclined surfaces that abut the magnet inclined surfaces of the magnet bodies located on both sides. (Appendix 4) Each of the magnet bodies is composed of a plurality of magnet pieces arranged along the axial direction of the rotor core, A rotor for a rotating electric machine as described in any one of Appendix 1 to Appendix 3, wherein the main portion of each of the pressing members is provided with a plurality of positioning protrusions for positioning each of the magnet pieces in the axial direction of the rotor core. (Appendix 5) 5. A rotor for a rotating electric machine according to claim 1, wherein a plurality of stopper protrusions are provided at the end of the outer peripheral surface in the axial direction of the rotor core to prevent the plurality of magnetic bodies from falling off the rotor core. [Explanation of symbols]

[0055] 12 rotor core, 12a first end face, 12b second end face, 12c outer peripheral surface, 12d first groove, 12e second groove, 12i stopper protrusion, 13 magnet body, 14 magnet piece, 14a magnet inclined surface, 15 retaining member, 15a main portion, 15b first fixing protrusion, 15c second fixing protrusion, 15d elongated hole, 15e retaining inclined surface, 15f positioning protrusion, 16 bolt (fastener).

Claims

1. a cylindrical rotor core having a first end face which is one end face in the axial direction, a second end face which is the other end face in the axial direction, and an outer circumferential surface; a plurality of magnet bodies provided on the outer peripheral surface of the rotor core at intervals in the circumferential direction of the rotor core; and a plurality of pressing members attached to the rotor core so as to be arranged alternately with the plurality of magnet bodies in the circumferential direction of the rotor core, and pressing the plurality of magnet bodies against the rotor core; Equipped with a plurality of first grooves are provided in the first end surface from the outer circumferential surface toward the center of the first end surface; a plurality of second grooves are provided in the second end surface from the outer circumferential surface toward the center of the second end surface; Each of the retaining members has a main portion that is brought into contact with the magnet body, a first fixing protrusion that is inserted into the first groove, and a second fixing protrusion that is inserted into the second groove, and is guided by the first groove and the second groove and is displaceable in the radial direction of the rotor core between a retaining position and a release position, the pressing position is a position where the magnet body is pressed against the rotor core, The rotor of the rotating electric machine, wherein the release position is a position radially outward of the rotor core than the pressing position.

2. The first fixing protrusion and the second fixing protrusion of each pressing member are each provided with a long hole, A fastener for attaching each of the holding members to the rotor core is passed through each of the elongated holes, 2. The rotor for a rotating electric machine according to claim 1, wherein each of the retaining members is displaceable in the radial direction of the rotor core within the range of the elongated hole.

3. Each of the magnet bodies is provided with a pair of tapered magnet inclined surfaces against which the main portions of the pressing members located on both sides abut, 3. The rotor of claim 1, wherein the main portion of each of the pressing members has a pair of tapered pressing inclined surfaces that contact the magnet inclined surfaces of the magnet bodies located on both sides.

4. Each of the magnet bodies is composed of a plurality of magnet pieces arranged along the axial direction of the rotor core, 3. The rotor for a rotating electric machine according to claim 1, wherein the main portion of each of the retaining members is provided with a plurality of positioning protrusions for positioning each of the magnet pieces in the axial direction of the rotor core.

5. 3. The rotor of claim 1, wherein a plurality of stopper protrusions are provided at the end of the outer peripheral surface in the axial direction of the rotor core to prevent the plurality of magnet bodies from falling off the rotor core.

Images