JP2004222347A - Rotor for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a rotor shaft to be recycled by molding and fixing the rotor shaft, a stacked iron core, and an end plate integrally without performing the plastic processing for the rotor shaft. <P>SOLUTION: For the rotor for a motor, the rotor shaft 1 has two fixed circumferential grooves 20. The fixed circumferential groove 20 is one which is made for a C ring 30 to fit in. Moreover, the fixed circumferential groove 20 is provided along the axial end of a stacked iron core 3 and a resin end plate 7 set around a rotor shaft 1. In short, for the stacked iron core 3 and the resin end plate 7 set around the rotor shaft 1, both their ends in an axial direction are caught by the C rings 30 engaging with the fixed circumferential grooves 20. Therefore, the C ring 30 can regulate the axial motion of the stacked iron core 3 and the resin end plate 7 to the rotor shaft 1. Accordingly, the rotor can be made without performing plastic processing to the rotor shaft. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotor of an electric motor, and more particularly to a rotor of an electric motor in which a rotor shaft can be reused without performing caulking or the like on the rotor shaft.
[0002]
[Prior art]
A conventional motor rotor generally has, for example, a structure as shown in FIG. 1A is a horizontal (AA) sectional view, and FIG. 1B is a left side view. In order to assemble the rotor shown in FIG. 1, first, a magnet end plate 2 is inserted into a rotor shaft 1 and magnetic steel sheets are stacked thereon to form a laminated core 3. The laminated core 3 is provided with an opening for embedding the magnet 4 in the circumferential direction thereof, and the opening penetrates the laminated core 3 in the axial direction. After the magnet 4 is embedded in the opening, the rotor end plate 5 is inserted into the rotor shaft 1. The magnet end plate 2 and the rotor end plate 5 are installed so as to sandwich the laminated core 3 and the magnet 4 to prevent the magnet 4 from jumping out of the laminated core 3. The rotor shaft 1 is subjected to caulking 6 with the magnet end plate 2, the laminated core 3 having the magnet 4 embedded therein, and the rotor end plate 5 inserted therein. By caulking 6, the magnet end plate 2, the laminated core 3 in which the magnets 4 are embedded, and the rotor end plate 5 are fixed to the rotor shaft 1, and the assembly of the rotor is completed.
[0003]
As other rotor assembling means, for example, a shaft having a knurled surface press-fitted into a through hole provided coaxially with the outer peripheral surface of the magnet member, and a metal bush is press-fitted and fixed to the shaft. In addition, a technique of sandwiching both end surfaces of a magnet member has been disclosed (see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 05-55744 (Page 5-7, FIG. 2)
[0005]
[Problems to be solved by the invention]
In recent years, there has been a demand for cost reduction in the manufacturing industry, and there is also a demand for reuse of components constituting a rotor. In particular, the rotor shaft has a higher strength than other components and thus has a longer life and a higher unit cost of the components.
[0006]
However, in the case of the rotor exemplified in the related art, the rotor shaft cannot be reused because processing involving plastic deformation is performed on the rotor shaft. In the case of the rotor shown in FIG. 1, since the rotor shaft is caulked, the laminated core and the end plate inserted into the rotor shaft cannot be removed unless the caulked portion is broken. Further, in the case of the rotor disclosed in Patent Literature 1, after the shaft is subjected to knurling, the magnet member and the metal bush are pressed and fixed, so that the shaft cannot be reused.
[0007]
An object of the present invention is to solve the above-described problems, and by assembling a rotor without performing plastic working on the rotor shaft, the rotor shaft can be reused, thereby reducing costs. The goal is to reduce it.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, a rotor of an electric motor according to the present invention includes a rotor shaft, a laminated core formed by laminating magnetic steel plates in an axial direction, and a predetermined circumferential direction of the laminated core. A plurality of openings formed in the axial direction and arranged at intervals, and magnets respectively fitted into the plurality of openings, and disposed at both axial ends of the laminated core, the laminated core And a terminating plate for restricting axial movement of the magnet. Further, the rotor of the electric motor includes a fixed circumferential groove provided on the rotor shaft, and a C-ring fitted into the fixed circumferential groove. The C-ring includes a laminated core inserted into the rotor shaft and a terminal plate. , By which the axial movement of the laminated core and the end plate with respect to the rotor shaft is regulated.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rotor of a motor according to an embodiment of the present invention will be described with reference to FIGS. FIGS. 2A and 2B illustrate the entire structure of the rotor according to the embodiment of the present invention, wherein FIG. 2A is a cross-sectional view taken along the line (BB), and FIG. 3A and 3B show a rotor shaft according to the embodiment of the present invention, in which FIG. 3A is a horizontal (CC) cross-sectional view, and FIG. 3B is a left side view. FIG. 4 shows a C-ring according to the embodiment of the present invention.
[0010]
First, the structure of the rotor of the electric motor according to the embodiment of the present invention will be described. According to the present embodiment, the laminated core 3 in which the magnets 4 are embedded is sandwiched on both sides by the end plates 7 formed of resin. The resin end plate 7 is for preventing the magnets 4 from protruding from the laminated iron core 3 and at the same time can restrict the opening of the outer peripheral portion of the laminated steel sheet.
[0011]
In the embodiment of the present invention, the case where a resin is used for the end plate is exemplified.However, any material that does not affect the performance of the rotor may be used, such as metal or any other material. No problem.
[0012]
Further, for fixing the laminated core 3 and the magnet 4, for example, the laminated core 3 in which the magnet 4 is embedded is placed in a mold, and the resin is injected into the mold. Alternatively, they may be integrally molded and fixed. As described above, any method may be adopted as long as the movement of the laminated core 3 and the magnet 4 can be regulated.
[0013]
The laminated core 3 and the resin end plate 7 integrally formed and fixed as described above are inserted into the rotor shaft 1. Here, the laminated core 3 and the resin end plate 7 integrally formed and fixed have two convex portions 22 on the inner peripheral surface thereof. On the other hand, the rotor shaft 1 also has a concave portion 23 at a position corresponding to the convex portion 22. The laminated core 3 and the resin end plate 7 are inserted into the rotor shaft 1 such that the projections 22 and the recesses 23 are fitted. Therefore, the movement of the laminated core 3 and the resin end plate 7 in the circumferential direction with respect to the rotor shaft 1 is restricted.
[0014]
Here, a characteristic of the structure of the rotor of the electric motor according to the present invention is that the rotor shaft 1 has two fixed circumferential grooves 20. The fixed peripheral groove 20 is a groove formed to fit the C ring 30 shown in FIG. The fixed circumferential groove 20 is provided along the end of the resin end plate 7 when the laminated core 3 and the resin end plate 7 are inserted into the rotor shaft 1. That is, the laminated core 3 and the resin end plate 7 inserted into the rotor shaft 1 are sandwiched by the C-rings 30 whose both ends in the axial direction are fitted into the fixed circumferential grooves 20. Therefore, the C ring 30 can restrict the axial movement of the laminated core 3 and the resin end plate 7 with respect to the rotor shaft 1.
[0015]
With the rotor assembled in this manner, the rotor can be easily disassembled by removing the C-ring 30. That is, according to the present invention, since the plastic processing is not performed on the rotor shaft as shown in the related art, the rotor shaft can be reused, and the cost can be reduced.
[0016]
【The invention's effect】
As described above, the present invention makes it possible to reuse the rotor shaft by manufacturing the rotor without performing plastic working on the rotor shaft. As a countermeasure, in the present invention, a fixed circumferential groove is provided on the rotor shaft, and a C-ring that fits into the fixed circumferential groove is employed. The C-ring can regulate the axial movement of the laminated core and the end plate with respect to the rotor shaft without performing plastic working on the rotor shaft. Further, the C-ring can be easily removed. Therefore, according to the present invention, since plastic working is not performed on the rotor shaft as shown in the related art, the rotor shaft can be reused and cost can be reduced.
[0017]
Furthermore, since caulking of the rotor shaft is not required, for example, a low-cost metal material typified by a brittle material such as cast iron can be selected for the rotor shaft, which also reduces costs. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a rotor of an electric motor according to a conventional technique.
FIG. 2 is a diagram illustrating an overall structure of a rotor according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a rotor shaft according to the embodiment of the present invention.
FIG. 4 is a diagram illustrating a C-ring according to the embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 rotor shaft, 2 magnet end plate, 3 laminated core, 4 magnet, 5 rotor end plate, 6 caulked portion, 7 resin end plate, 20 fixed circumferential groove, 22 convex portion of laminated core and resin end plate, 23 rotation Child shaft recess, 30 C ring.

Claims (1)

A rotor shaft,
A laminated core formed by laminating magnetic steel plates in the axial direction;
A plurality of openings that are arranged at predetermined intervals in the circumferential direction of the laminated core and that are formed to open in the axial direction,
A magnet inserted into each of the plurality of openings,
End plates arranged on both ends of the laminated core in the axial direction to restrict axial movement of the laminated core and the magnet;
The rotor of the electric motor including
A fixed circumferential groove provided on the rotor shaft,
A C-ring fitted into the fixed circumferential groove,
With
This C-ring regulates the axial movement of the laminated core and the terminating plate with respect to the rotor shaft by sandwiching the laminated core and the terminating plate inserted into the rotor shaft.

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