JP2002345186A - Rotating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating body which is capable of cost reduction and weight reduction, without deteriorating the performance of a motor. SOLUTION: A permanent magnet 14 and electromagnetic steel plates 16 are arranged around a rotating shaft 12 of a rotor 10 of a motor and is sandwiched and fixed by the body 18 of revolution. A part of the body 18, which part is not in contact with the permanent magnet 14, is constituted of a first member 20 formed of magnetic material, and a part which is in contact with the permanent magnet 14 is constituted of a second member 22 formed of nonmagnetic material. Thereby the usage of expensive nonmagnetic material is reduced, manufacturing cost is reduced, leakage of lines of magnetic force from the permanent magnet 14 is reduced, and deterioration of performance of the rotor 10 can be restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotating body used for a rotor of a motor, a generator, etc.

[0002]

2. Description of the Related Art Many rotors of motors such as motors and generators have a permanent magnet. 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 JP-A-2000-152537.

[0003]

However, in the above-mentioned conventional rotating body, if the portion in contact with the permanent magnet is a magnetic body, the leakage of lines of magnetic force causes a decrease in motor torque or a decrease in power generation electromotive force of a generator. It is necessary to form the rotating body with a non-magnetic material, because it causes a decrease in performance. In this case, the cost of the non-magnetic material is generally higher than that of the magnetic material such as iron, so that there is a problem that the manufacturing cost of the rotating body increases.

[0004] Further, there is a problem that the weight of the rotating body cannot be sufficiently reduced due to the limitation of the materials used as described above.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a rotating body capable of reducing cost and weight without reducing the performance of an electric motor.

[0006]

In order to achieve the above object, the present invention relates to a rotating body used for a rotor of an electric motor, wherein a plurality of different materials are provided in a circumferential direction with respect to a rotating shaft. It is characterized by being configured in combination.

[0007] Further, in the above-mentioned rotating body, the different material is
The specific gravity is different from each other.

[0008] Further, in the above-mentioned rotating body, the different material is
At least one of them is made of a metal or a material containing a metal.

Further, in the above-mentioned rotating body, the different kind of material is
It is characterized by comprising a magnetic material and a non-magnetic material.

Further, a magnet is incorporated in the rotating body, and the magnet is in contact with only the non-magnetic body.

In the above-mentioned rotating body, the different kind of material is
At least one is constituted by a sintered metal.

[0012]

Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.

FIG. 1 is a sectional view showing 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 a rotating shaft 12 of a rotor 10. The permanent magnet 14 and the electromagnetic steel plate 16 are sandwiched and fixed by the rotating body 18. The rotating member 18 has a portion not in contact with the permanent magnet 14 made of a first member 20 made of a magnetic material such as iron, and a portion in contact with the permanent magnet 14 made of a non-magnetic material. And a second member 22.

In this embodiment, the permanent magnet 14 is
2 are arranged in the circumferential direction. Therefore, the second member 22 that is in contact therewith is also mounted on the first member 20 in the circumferential direction with respect to the rotation shaft 12. Thus, the first member 20 and the second member 22 are configured by combining two different materials.
With the above-described configuration, the second member 22 formed of a non-magnetic material is disposed at a portion that comes into contact with the permanent magnet 14, so that it is possible to suppress a decrease in the performance of the electric motor due to leakage of the lines of magnetic force. In addition, since the first member 20 formed of a low-cost magnetic material is disposed in a portion not in contact with the permanent magnet 14, the manufacturing cost of the rotating body 18 can be reduced.

The magnetic material may be, for example, iron, nickel, cobalt or alloys thereof.
Further, as the non-magnetic material, copper, aluminum and the like can be considered.

The first member 20 and the second member 22 described above can be appropriately combined according to the use and function of the rotating body 18. In the above example, the magnetic material and the non-magnetic material are composed of different materials, but the present invention is not limited to this. For example,
Even in the case of a combination of a magnetic material and a non-magnetic material, or in the case of a combination of other materials, two materials having different specific gravities are selected, and only a portion where a material having a large specific gravity needs to be used is made a heavy material. By using a material having a small specific gravity for the portion, the weight of the entire rotating body 18 can be reduced.

Depending on the use of the rotating body 18, it is often necessary to use a metal or a material containing a metal. It is also conceivable to use a material and the other material such as a resin. As a result, the use of expensive metals can be reduced, and an increase in weight when all metal materials are used can be suppressed.

The first member 20 and the second member 22 are preferably fixed to each other by, 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.

FIG. 2A shows the rotating body 1 shown in FIG.
8 is shown. In FIG. 2A, the rotating body 1
8 is a view seen from the left side in the direction of the rotation shaft 12 shown in FIG. As shown in FIG. 2A, the second member 2
2 are arranged and combined on the first member 20 in the circumferential direction of the rotating shaft 12.

FIG. 2B is a sectional view taken along the line BB of FIG. 2A. In FIG. 2B, the first member 2
The 0 and the second member 22 are fixed by a caulking structure 24. By employing such a caulking structure 24, it is possible to sufficiently withstand a rotation speed of, for example, about 10,000 rpm.

The permanent magnet 14 shown in FIG. 1 is arranged so as to be in contact with the second member 22 shown in FIG.

[0022]

As described above, according to the present invention,
Since the rotating body is formed by combining a plurality of different materials in the circumferential direction with respect to the rotation axis of the rotor, the weight of the rotating body is reduced, the cost is reduced, and the cost is increased by appropriately selecting the combination of the different materials. Functionalization can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of a rotor using a rotating body according to the present invention.

FIG. 2 is a plan view and a cross-sectional view of the rotating body shown in FIG.

[Explanation of symbols]

10 rotors, 12 rotation axes, 14 permanent magnets, 16
Electromagnetic steel sheet, 18 rotating body, 20 first member, 22 second member, 24 caulking structure.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kei Sasaki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Yasuhiro Fujii 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Sanshin Building In Japan Powder Alloy Co., Ltd. (72) Inventor Keizo Yoshida 1-4-1, Yurakucho, Chiyoda-ku, Tokyo Sanshin Building Inside Japan Powder Alloy Co., Ltd. F-term (reference) 5H002 AA06 AB07 AB08 AC08 AE06 AE08 5H622 CA02 CA07 CA10 CA14 PP03 PP12

Claims (6)

[Claims] 1. A rotating body used for a rotor of an electric motor, comprising a plurality of different materials combined in a circumferential direction with respect to a rotating shaft. 2. The rotating body according to claim 1, wherein the different materials have different specific gravities. 3. The rotating body according to claim 2, wherein at least one of said dissimilar materials is made of a metal or a material containing a metal. 4. The rotating body according to claim 1, wherein the different kind of material comprises a magnetic material and a non-magnetic material. 5. The rotating body according to claim 4, wherein a magnet is incorporated, and the magnet contacts only the non-magnetic body. 6. The rotating body according to claim 1, wherein at least one of the different materials is made of a sintered metal.