JP2007110873A - Rotor of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a rotating electric machine that can sufficiently transmit torque between a rotor shaft and a rotor core. <P>SOLUTION: The rotor 10 comprises first and second electromagnetic steel sheets 21, 22 that are different from each other in inside diameter. Further, the rotor comprises the rotor core 2 in which a stepped part 60 exists in a boundary between the first and the second electromagnetic steel sheets 21, 22; a rotor shaft 1 into which the rotor core 2 is fit; a flange member 30 that is fit into the rotor shaft 1 and faces the rotor core 2; and a key groove 41, an extension part 42, and a protrusion 27 that are formed at the stepped part 60 and the flange member 30 and serve as torque transmission mechanisms. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine, and more particularly to a rotor of a rotating electrical machine having a rotor core composed of first and second electromagnetic steel plates having different inner diameters.

Conventionally, rotating electric machines are disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-102460 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2002-112481 (Patent Document 2).
JP 2005-102460 A JP 2002-112481 A

  Patent Document 1 discloses a core in which a plurality of types of magnetic steel plates having different shapes are laminated. In patent document 2, the structure which provides unevenness | corrugation between an end plate and an electromagnetic steel plate, and is connected by caulking is disclosed.

  When a plurality of electromagnetic steel sheets having different shapes are used, there is a problem that it is difficult to transmit torque at the step portion.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a rotor of a rotating electrical machine that can reliably transmit the torque of the rotor core to the rotor shaft.

  A rotor of a rotating electrical machine according to the present invention includes first and second electromagnetic steel plates having different inner diameters, and a rotor core having a step portion at an inner peripheral boundary of the first and second electromagnetic steel plates, and the rotor core is fitted. A rotor shaft to be matched, a flange member fitted to the rotor shaft and facing the rotor core, and a torque transmission mechanism provided on the stepped portion or the flange member.

  In the rotor of the rotating electrical machine configured as described above, the torque transmission mechanism is provided in the stepped portion or the flange member caused by the inner diameter difference between the first and second electromagnetic steel plates, so that the torque can be reliably transmitted in this portion.

Preferably, the torque transmission mechanism has a structure for fitting a key to the step portion.
Preferably, the torque transmission mechanism is a mechanism for maintaining contact between any one of the first and second electromagnetic steel sheets and the flange member.

  According to this invention, it is possible to provide a rotor of a rotating electrical machine that can reliably transmit torque between the rotor shaft and the rotor core.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
1 is a cross-sectional view of a rotating electrical machine according to Embodiment 1 of the present invention. Referring to FIG. 1, rotating electric machine 100 includes a rotor 10 that rotates about a rotating shaft 8, and a stator 20 that is provided on the outer periphery of rotor 10.

  The rotor 10 includes a rotor shaft 1 extending along the rotation shaft 8 and a rotor core 2 fitted to the outer peripheral surface of the rotor shaft 1. A key groove 11 extends in the longitudinal direction on the outer peripheral surface of the rotor shaft 1. Although the rotor shaft 1 is shown in a hollow shape, the rotor shaft 1 is not limited to this, and may be a so-called solid shape in which the contents of the rotor shaft 1 are packed.

  The rotor core 2 includes a first electromagnetic steel plate 21 and a second electromagnetic steel plate 22. The inner diameter of the first electromagnetic steel plate 21 is smaller than the inner diameter of the second electromagnetic steel plate 22. The first electromagnetic steel plate 21 is provided with a hole 23 for weight reduction. In addition, this hole 23 does not necessarily need to be provided.

  The convex portion 26 of the first electromagnetic steel plate 21 meshes with the key groove 11, and the torque is transmitted between the first electromagnetic steel plate 21 and the rotor shaft 1 by the convex portion 26 meshing with the key groove 11. It is.

The outer peripheral surface 123 of the rotor core 2 faces the stator 20.
The second electromagnetic steel plate 22 is provided in contact with the first electromagnetic steel plate 21. A permanent magnet is embedded in the rotor core 2, and a magnet end plate 51 is disposed so as to come into contact with the permanent magnet.

  A flange member 30 is fitted on the rotor shaft 1. The flange member 30 has a convex portion 43, and the convex portion 43 is fitted in the key groove 11. The cross section of the flange member 30 is bent in a crank shape, and has an inner end face 31, an outer end face 32, and a radial end face 33 that connects the inner end face 31 and the outer end face 32. A boundary portion between the first electromagnetic steel plate 21 and the second electromagnetic steel plate 22 is a step portion 60, and a step exists in this portion.

  The stator 20 has a stator core 25, and a coil is wound around the stator core 25 to constitute a U phase, a V phase, and a W phase.

  2A is an enlarged cross-sectional view showing a portion surrounded by IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. FIG. 2C is a cross-sectional view taken along the line IIC-IIC in FIG. 2A to 2C, a key groove 41 extending in the axial direction is provided on the radial end surface 33 of the flange member 30, and the key groove 41 has an extension 42 protruding from the inner end surface 31. . The key groove 41 and the extension portion 42 are fitted with the convex portions 27 of the second electromagnetic steel plate 22. The first electromagnetic steel plate 21 and the second electromagnetic steel plate 22 have inner peripheral surfaces 121, 122, and a distance R 1 (inner diameter R 1 of the first electromagnetic steel plate 21) from the rotating shaft 8 to the inner peripheral surface 121 is the inner from the rotating shaft 8. It is smaller than the distance R2 (inner diameter R2 of the second electromagnetic steel plate 22) to the peripheral surface 122.

  In the odd-shaped rotor core 2 composed of the first electromagnetic steel plate 21 that is a small-diameter electromagnetic steel plate and the second electromagnetic steel plate 22 that is a large-diameter electromagnetic steel plate, a portion that is not fitted to the key is generated at a portion where the step portion 60 is present. Is difficult to communicate. Therefore, in the present invention, the key groove 41 and the extension portion 42 are provided so as to extend toward the stepped portion 60, and all the convex portions 27 of the second electromagnetic steel sheet 22 are fitted into the key groove 41 and the extension portion 42. Torque is transmitted.

  That is, the rotor 10 of the rotating electrical machine 100 according to the first embodiment of the present invention has the first and second electromagnetic steel plates 21 and 22 having different inner diameters, and at the boundary between the first and second electromagnetic steel plates 21 and 22. Are provided on the stepped portion 60 or the flange member 30, the rotor core 2 on which the stepped portion 60 exists, the rotor shaft 1 on which the rotor core 2 is fitted, the flange member 30 fitted on the rotor shaft 1 and facing the rotor core 2, And a keyway 41 and an extension 42 as a torque transmission mechanism.

  FIG. 3 is a perspective view of the rotor shaft and the flange member according to the first embodiment of the present invention. Referring to FIG. 3, the rotor shaft 1 has a key groove 11 extending in the axial direction (longitudinal direction) and a circumferential groove 12 extending perpendicular to the key groove 11. Although only one key groove 11 is shown in FIG. 3, the present invention is not limited to this, and a plurality of key grooves 11 may be provided on the outer peripheral surface of the rotor shaft 1.

  A flange member 30 is fitted on the rotor shaft 1. The flange member 30 has a convex portion 43, and the convex portion 43 fits into the key groove 11, so that torque can be transmitted from the flange member 30 to the rotor shaft 1. The disc-shaped flange member 30 has an inner end face 31 extending in the radial direction, a radial end face 33 extending so as to be orthogonal to the radial direction, and an outer end face 32 extending to the radial end face 33 and extending in the radial direction. The radial end surface 33 is provided with a keyway 41 and an extension 42. In this embodiment, there is one key groove 41 and extension part 42, but a plurality of key grooves 41 and extension parts 42 may be provided. Moreover, although the bottom of a groove | channel is formed in the extension part 42, you may use a groove | channel without a bottom.

  FIG. 4 is a perspective view of a second electromagnetic steel sheet according to Embodiment 1 of the present invention. Referring to FIG. 4, the second electromagnetic steel plate 22 has a ring shape and is provided with a convex portion 27 so as to protrude in the radial direction. There may be a plurality of convex portions 27. Furthermore, the convex part 27 may be tapered. The convex portion 27 is fitted into the key groove 41 and the extension portion 42.

  FIG. 5 is a perspective view of the first electromagnetic steel sheet according to Embodiment 1 of the present invention. With reference to FIG. 5, the first electromagnetic steel plate 21 is provided with holes 23. A plurality of holes 23 may be provided, and the plurality of holes 23 are arranged along the circumferential direction of the first electromagnetic steel plate 21 at equal intervals or unequal intervals. The convex portions 26 extend in the radial direction, and the number and shape thereof are not limited. The convex portion 26 is fitted in the key groove 11.

  In the rotor 10 according to the first embodiment configured as described above, since all the convex portions 27 of the second electromagnetic steel sheet 22 are fitted with the key grooves 41 and the extension portions 42, torque can be reliably transmitted. it can.

(Embodiment 2)
FIG. 6 is a sectional view of a rotor according to the second embodiment of the present invention. Referring to FIG. 6, in rotor 10 according to the second embodiment of the present invention, a convex portion (not shown in FIG. 6) is provided on magnet end plate 51, and the convex portion is crushed at the time of assembly to outer end surface 32. Press the magnet end plate 51 securely. The inner end face 31 is in contact with the first electromagnetic steel plate 21. In addition to providing a convex portion on the magnet end plate 51, an elastic body such as a spring is provided, and the magnet end plate 51 can be reliably pressed against the outer end surface 32 of the flange member 30 by the urging force of the elastic body. Good.

  FIG. 7 is a perspective view of a rotor shaft and a magnet end plate according to the second embodiment of the present invention. Referring to FIG. 7, the magnet end plate 51 is provided with a plurality of convex portions 52 before the second electromagnetic steel plate is assembled. The convex portion 52 is made of a material that is easily elastically deformed. The magnet end plate 51 is in contact with the outer end surface 32 of the flange member 30. The convex portion 52 may be made of the same material as the magnet end plate 51 or a different material. In FIG. 7, a plurality of convex portions 52 are provided in the circumferential direction, but it is not necessary to provide a plurality of convex portions 52, and they are arranged on the magnet end plate 51 so that a single convex portion is continuous. Also good. Further, in FIG. 7, the convex portions 52 are regularly arranged on a concentric circle and on the same radius with the rotation axis as the center. However, the present invention is not limited to this, and the convex portions 52 may be arranged at unequal intervals. Good.

  FIG. 8 is a cross-sectional view of the flange member and the magnet end plate according to the second embodiment of the present invention. Referring to FIG. 8, a recess may be provided in a part of flange member 30, and magnet end plate 51 may be disposed in the recess. Furthermore, a recess is not provided, and the outer end surface 32 is a flat surface, and the magnet end plate 51 may be disposed on the flat surface.

  FIG. 9 is a cross-sectional view of a flange member and a magnet end plate according to the second embodiment of the present invention. With reference to FIG. 9, the convex part 52 may have a gentle shape. That is, although the rectangular-shaped convex part 52 was provided in FIG. 8, it is not restricted to this, You may provide the convex part 52 of a curved surface shape.

  In the rotor 10 according to the second embodiment configured as described above, the torque transmission mechanism is the convex portion 52 for maintaining the contact between the second electromagnetic steel plate 22 and the flange member 30.

  The rotor 10 according to the second embodiment configured as described above has the same effect as the rotor according to the first embodiment.

(Embodiment 3)
FIG. 10 is a perspective view of a flange member according to the third embodiment of the present invention. FIG. 11 is a perspective view of a second electromagnetic steel sheet according to Embodiment 3 of the present invention. With reference to FIGS. 10 and 11, in the rotor according to the second embodiment of the present invention, flange member 30 is provided with a convex portion 241, and convex portion 241 has an extended portion 242 protruding from inner end surface 31. The second electromagnetic steel plate 22 is formed with a key groove 222 that fits into the convex portion 241 and the extension portion 241. That is, in the first embodiment, the key groove is provided in the flange member 30, but in this embodiment, the key groove 222 is provided on the second electromagnetic steel plate 22 side, and the key groove 222 is projected on the flange member 30 side. The portion 241 and the extended portion 242 are fitted.

  The rotor according to the third embodiment configured as described above has the same effect as the rotor according to the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be used in the field of rotating electrical machines mounted on vehicles, for example.

It is sectional drawing of the rotary electric machine according to Embodiment 1 of this invention. 2A is an enlarged cross-sectional view showing a portion surrounded by IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. FIG. 2C is a cross-sectional view taken along the line IIC-IIC in FIG. It is a perspective view of the rotor shaft and flange member according to Embodiment 1 of this invention. It is a perspective view of the 2nd electromagnetic steel plate according to Embodiment 1 of this invention. It is a perspective view of the 1st electromagnetic steel plate according to Embodiment 1 of this invention. It is sectional drawing of the rotor according to Embodiment 2 of this invention. It is a perspective view of the rotor shaft and magnet end plate according to Embodiment 2 of this invention. It is sectional drawing of the flange member and magnet end plate according to Embodiment 2 of this invention. It is sectional drawing of the flange member and magnet end plate according to Embodiment 2 of this invention. It is a perspective view of the flange member according to Embodiment 3 of this invention. It is a perspective view of the 2nd electromagnetic steel plate according to Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rotor shaft, 2 Rotor core, 8 Rotating shaft, 10 Rotor, 11 Key groove, 12 Outer periphery groove, 20 Stator, 21 1st electromagnetic steel plate, 22 2nd electromagnetic steel plate, 23 holes, 25 Stator core, 26 Convex part, 30 Flange member , 31 Inner end face, 32 Outer end face, 33 Radial end face, 41 Key groove, 42 Extension part, 60 Step part.

Claims (3)

A rotor core having first and second electromagnetic steel plates having different inner diameters, and having a step portion at an inner peripheral side boundary of the first and second electromagnetic steel plates,
A rotor shaft to which the rotor core is fitted, and
A flange member fitted to the rotor shaft and facing the rotor core;
A rotor of a rotating electrical machine, comprising: a torque transmission mechanism provided on the stepped portion or the flange member.   The rotor of a rotating electrical machine according to claim 1, wherein the torque transmission mechanism is a structure for fitting a key to the stepped portion.   The rotor of a rotating electrical machine according to claim 1, wherein the torque transmission mechanism is a mechanism for maintaining contact between the electromagnetic steel plate and the flange member.

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