JP4667640B2 - Rotating body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a rotating body used for a rotor of a motor, a generator or the like (hereinafter referred to as an electric motor).
[0002]
[Prior art]
Many rotors of motors such as motors and generators are provided with permanent magnets. Such a permanent magnet is held by a rotating body called an end ring or a flange. An example of such a rotor is disclosed in Japanese Patent Laid-Open No. 2000-152537.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional rotating body, if the portion in contact with the permanent magnet is a magnetic body, the leakage of the magnetic field lines causes a decrease in performance such as a decrease in motor torque or a decrease in generator electromotive force. It was necessary to form with a non-magnetic material. In this case, since the non-magnetic material is generally higher in cost than the magnetic material such as iron, there is a problem that the manufacturing cost of the rotating body is increased.
[0004]
There is also a problem that the weight of the rotating body cannot be sufficiently reduced due to the limitation of the materials used as described above.
[0005]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a rotating body that can achieve cost reduction and weight reduction without degrading the performance of the electric motor.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a permanent magnet attached to a rotating shaft, an electromagnetic steel plate attached to the rotating shaft, and an end ring that sandwiches and fixes the permanent magnet and the electromagnetic steel plate. The ring is composed of a first member formed of a magnetic material at a portion not contacting the permanent magnet and a second member formed of a non-magnetic material at a portion contacting the permanent magnet. The first member and the second member are combined in the circumferential direction with respect to the shaft.
[0007]
Further, in the rotating element, the first and second members, and wherein the specific gravity is different from each other.
[0008]
Moreover, Te the rotating element smell, the first member even without least is characterized by being composed of a material containing a metal or a metal.
[0009]
Further, in the rotating element, a second member, characterized by being composed of a resin.
[0010]
Further, in the rotating element, the first and second members, characterized in that it is fixed by caulking structure.
[0011]
Moreover, Te the rotating element odor, even without least the first member, characterized in that it is constituted by a sintered metal.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.
[0013]
FIG. 1 shows a cross-sectional view of an example of a rotor using a rotating body according to the present invention. In FIG. 1, a permanent magnet 14 and an electromagnetic steel plate 16 are attached to the rotating shaft 12 of the rotor 10. The permanent magnet 14 and the electromagnetic steel plate 16 are sandwiched and fixed by a rotating body 18. The rotating body 18 is configured by a first member 20 in which a portion not in contact with the permanent magnet 14 is formed of a magnetic material such as iron, and a portion in contact with the permanent magnet 14 is formed of a non-magnetic material. The second member 22 is configured.
[0014]
In the present embodiment, the permanent magnet 14 is arranged in the circumferential direction with respect to the rotating shaft 12. Therefore, the second member 22 in contact with the second member 22 is also mounted on the first member 20 in the circumferential direction with respect to the rotating shaft 12. As a result, the two different materials of the first member 20 and the second member 22 are combined. With the configuration as described above, the second member 22 formed of a non-magnetic material is disposed in the portion that contacts the permanent magnet 14, so that it is possible to suppress a reduction in the performance of the electric motor due to leakage of magnetic field lines. Moreover, since the 1st member 20 formed with the low cost magnetic body is arrange | positioned about the part which is not contacting the permanent magnet 14, the manufacturing cost of the rotary body 18 can be reduced.
[0015]
In addition, as said magnetic body, iron, nickel, cobalt, or those alloys can be considered, for example. Moreover, copper, aluminum, etc. can be considered as a nonmagnetic material.
[0016]
The first member 20 and the second member 22 described above can be appropriately combined depending on the application and function of the rotating body 18. In the above example, the magnetic material and the non-magnetic material are combined with each other, but the present invention is not necessarily limited thereto. For example, even in the case of a combination of a magnetic material and a non-magnetic material, or in a combination of other materials, two materials having different specific gravities are selected, and only a portion that needs to use a material having a large specific gravity is made heavy material The weight of the entire rotating body 18 can be reduced by using other parts of a material having a small specific gravity.
[0017]
Further, depending on the use of the rotating body 18, there are many cases where it is necessary to use a metal or a material containing a metal. However, it is conceivable that the other is made of resin or the like. As a result, it is possible to reduce the use of expensive metal and to suppress an increase in weight when all metal materials are used.
[0018]
Note that the first member 20 and the second member 22 are preferably fixed with, for example, a caulking structure. In order to realize this caulking structure, it is preferable that at least one of the first member 20 and the second member 22 is made of a sintered metal.
[0019]
FIG. 2A shows a plan view of the rotating body 18 shown in FIG. In FIG. 2A, the rotating body 18 is a view seen from the left side in the direction of the rotating shaft 12 shown in FIG. 1, and the second member 22 is hidden by the back surface side, and is indicated by a broken line. As shown in FIG. 2A, the second member 22 is disposed and combined on the first member 20 in the circumferential direction of the rotating shaft 12.
[0020]
FIG. 2B shows a cross-sectional view taken along the line BB in FIG. In FIG. 2B, the first member 20 and the second member 22 are fixed by a caulking structure 24. By adopting such a caulking structure 24, for example, it is possible to sufficiently withstand a rotational speed of about 10,000 rpm.
[0021]
Further, the permanent magnet 14 shown in FIG. 1 is disposed so as to be in contact with the second member 22 of FIG.
[0022]
【The invention's effect】
As described above, according to the present invention, the rotating body is configured by combining a plurality of different materials in the circumferential direction with respect to the rotation axis of the rotor, and therefore, by appropriately selecting the combination of the different materials. In addition, the rotating body can be reduced in weight, cost, and functionality.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a rotor using a rotating body according to the present invention.
2A and 2B are a plan view and a cross-sectional view of the rotating body shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rotor, 12 Rotating shaft, 14 Permanent magnet, 16 Electrical steel plate, 18 Rotating body, 20 1st member, 22 2nd member, 24 Caulking structure

Claims (6)

A permanent magnet attached to the rotating shaft;
A magnetic steel plate attached to the rotating shaft;
An end ring that sandwiches and fixes a permanent magnet and a magnetic steel sheet; and
With
The end ring is constituted by a first member formed of a magnetic material at a portion not contacting the permanent magnet and a second member formed of a non-magnetic material at a portion contacting the permanent magnet, A rotor for an electric motor, wherein a first member and a second member are combined in a circumferential direction with respect to a rotating shaft. In rotor of claim 1, wherein the electric motor, the first member and the second member, the rotor of the motor, wherein the specific gravity is different from each other. Claim 2 Te rotor smell of the electric machine described in the rotor of the motor is the first member, characterized in that it is made of a material containing a metal or a metal even without low. In the motor rotor according to any one claim of claims 1 to 3, the rotor of the motor is the second member, characterized by being composed of a resin. In the motor rotor according to any one claim of claims 1 to 4, the rotor of the motor and the first and second members, characterized in that it is fixed by caulking structure. The rotor of the motor of claims 1 Te rotor smell of the motor of any one of claims 3, the first member even without least, characterized in that it is constituted by a sintered metal.

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