JPS631019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnet device used as a stator of a flat rotating electrical machine.

Conventionally, there is a stator-side magnet used in a flat rotating electric machine, which has an annular shape and has a predetermined magnetic pole magnetized on the front thereof. However, such a magnet occupies a considerable amount of space within the rotating electrical machine, which is extremely disadvantageous in making the rotating electrical machine thinner.

Therefore, in order to effectively utilize the dimension in the thickness direction of conventional magnets, for example, two semi-annular magnets 1 and 2 are arranged with a predetermined gap 3 in between, as shown in FIG. There is one with 4. In other words, if you do this, magnet 1,
Since the brush 4 can be accommodated in the space in the thickness direction of 2, this is extremely effective in making the rotating electric machine thinner.

However, in this method, the magnet is divided into a plurality of parts, which increases the number of assembly steps, which requires a great deal of effort and trouble. In addition, it is necessary to separately consider how to fix the brushes installed in the gap between the magnets. If this fixation is not sufficient, large vibrations and sliding noises may occur when the brushes slide against the commutator on the rotor side. It happened that it happened.

This invention was made in order to eliminate the above-mentioned drawbacks.The magnet body itself is integrally formed into an annular shape, so assembly is easy. Furthermore, by embedding a part of the brush device and fixing it integrally, it is possible to reduce the thickness of rotating electric machines. It is an object of the present invention to provide a magnet device for a flat rotary electric machine that can greatly contribute to the shape of the brush and also prevent vibration and sliding noise from occurring in the brush.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 11 denotes an annular magnet main body, and the magnet main body 11 is magnetized in the front circumferential direction with the illustrated polarity (two poles in the illustrated example).

Here, the magnet main body 11 is made of a resin material mixed with a magnetic material and is integrally formed into an annular shape by molding.

Further, in the magnet main body 11, a part of the brush device 12 is embedded, for example, at the boundary between the magnetic poles. As shown in FIG. 3, this brush device 12 has a brush 122 supported on a resin brush stand 121. Here, the resin material forming the brush stand 121 is one that reacts at a higher temperature than the resin material of the magnet body 11. For this reason, the brush device 12 is integrally fixed with the brush stand 121 buried in a predetermined position corresponding to the boundary of the magnetic poles without being deformed during the molding process of the magnet body 11. In this case, the brush 122 is led out into the hollow part of the magnet body 11.

The magnet device configured in this manner is arranged as a stator as shown in FIG.
The brush 1 of the brush device 12 is attached to the side commutator 14.
22 is being slid.

However, if you do this, the magnet body 1
Since magnet 1 is formed from one piece without being divided, assembly can be greatly simplified compared to conventional magnets that are divided into a plurality of parts. In addition, since the brush stand 121 of the brush device 12 is embedded in the magnet body 11, the dimension in the thickness direction of the magnet body 11 can be effectively utilized, which greatly contributes to making the rotating electric machine thinner. The device 12 is embedded in the magnet main body 11 made of resin material as described above at the part that mainly includes the brush stand 121, and is firmly fixed by the elastic action peculiar to the resin. 1
It is also possible to prevent vibration and sliding noise from occurring when the commutator 22 slides on the commutator 14 on the rotor 13 side.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications within the scope without changing the gist.
For example, in the above description, the case of two poles has been described, but cases with other numbers of poles can also be implemented in the same manner.

As described above, according to the present invention, assembly is easy because the magnet body itself is integrally formed in an annular shape, and furthermore, by embedding a part of the brush device and fixing it integrally, it is possible to greatly reduce the thickness of rotating electric machines. It is possible to provide a magnet device for a flat rotating electric machine that can contribute to the above-mentioned problems and also prevent the occurrence of vibration and sliding noise in the brushes.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional magnet, and FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a perspective view showing a brush device used in the same embodiment, and FIG. 4 is a schematic diagram showing the state of use of the magnet device according to the same embodiment. 1, 2...Semi-annular magnet, 3...Gap, 4
... Brush, 11 ... Magnet body, 12 ...
Brush device, 121...Brush stand, 122...Brush, 13...Stator, 14...Commutator.

Claims (1)

[Scope of Claims] 1. A brush device in which a brush part is supported at its base by a brush stand part is attached to a magnet body made of a resin material mixed with a magnetic material integrally formed in an annular shape. A flat rotary electrical machine, characterized in that the magnet body is integrally fixed by burying at least a portion mainly containing the brush base portion so as to extend inward of the annular magnet body. Magnetic device. 2. A magnet device for a flat rotating electric machine as set forth in claim 1, wherein the brush base of the brush device is made of resin. 3. The flat rotating electric machine according to claim 1, wherein the magnet main body is magnetized with a predetermined magnetic pole in the front circumferential direction, and a part of the brush device is embedded in a boundary between the magnetic poles. magnetic device.