JPS6026543Y2 - small flat motor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small flat motor in which a stator field magnet and a rotor oppose each other through an axial gap, and the axial length thereof is made small and compact.

In conventional small flat motors of this type, a stator field magnet that opposes the rotor through an axial gap is attached to the inner surface of one bracket, and a power supply brush that supplies power to the rotor is attached to the inner surface of the other bracket. However, there is a drawback that the axial length of the entire motor is large due to the axial length of the field magnet and the feeding brush.

The present invention aims to eliminate such drawbacks and provide a small flat motor in which the brush holding plate to which the power supply brush is attached is easily fixed.One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a bracket, a brush holding plate, and a field magnet, and FIG. 2 is a half sectional view of a small flat motor.

In these drawings, reference numeral 1 designates a bottomed cylindrical motor case in which a rotor 2 is housed.

The rotor consists of a flat armature 3 having a group of windings fixed in a plate shape, a commutator 4, and a rotor shaft 5 on which these are mounted. It is rotatably supported by a bearing 8 provided at the center of a bracket 7 that covers the opening of the motor case 1.

The field magnet 9 attached to the inner surface of the bracket 7 has a groove 11 on the bracket attachment surface 10 thereof.

Reference numeral 12 designates a brush holding plate, which consists of a central ring portion 13 and protruding portions 14 and 14 that protrude outward to the left and right.
Printed wiring 15.15 is provided extending from one protrusion 14 to the central ring portion 13 (front side in FIG. 1).

The respective base ends of the pair of power supply brushes 16, 16 located on the other surface (rear surface in FIG. 1) of the brush holding plate 12 are fixed to respective printed wirings of the central ring portion 13 by soldering portions 17.

Each protrusion 14 of the brush holding plate 12 is disposed in the groove 11 of the field magnet 9, and by attaching the field magnet 9 to the inner surface of the bracket 7, the brush holding plate 12 is connected to the field magnet 9 and the bracket 7. It is clamped and fixed by.

In this case, the bracket 7 is provided with a recessed relief step 18 so that the soldering portion 17 of the base end of the power supply brush 16 does not come into contact with the inner surface of the bracket 7.

Further, the pair of feed brushes 16, 16 and the commutator 4 are located in the center hole 19 of the field magnet 9.

As described above, according to the configuration of the present invention, a pair of grooves extending radially from the periphery of the center hole of the field magnet are provided on the bracket mounting surface of the field magnet, and the center ring portion of the brush holding plate is inserted into the center hole. At the same time, since a pair of protrusions of the brush holding plate extending radially from the periphery of the center ring part are arranged in the groove part, the axial length of the feeding brush part can be absorbed, and the length of the entire motor can be reduced. The axial length can be reduced.

In addition, by attaching a field magnet to the bracket, the brush holding plate is clamped and fixed by the pair of protruding parts of the brush holding plate, so that the brush holding plate can be held even if the central ring part to which the power supply brush is attached is in a floating state. The board can be firmly fixed.

Furthermore, the bracket is provided with a recessed part that allows the soldering of the center ring, which occurs when the power supply brush is attached to the center ring of the brush holding plate, to escape, so the size of the soldering part depends on each motor. Even for different types of mass production, the motor can be further miniaturized because the soldering part does not come into contact with the bracket.

[Brief explanation of the drawing]

The drawing shows an embodiment of a small flat motor according to the present invention,
FIG. 1 is an exploded perspective view of the bracket, brush holding plate, and rotor, and FIG. 2 is a half-sectional view of the small flat motor. 9...Field magnet, 2...Rotor, 7.
... Bracket, 11 ... Groove, 16,
16...Power supply brush, 12...Brush holding plate, 13...Central ring portion, 14.14...
...Protrusion, 19...Central hole, 17...
...Soldering is part 18...Concave stepped part.

Claims (1)

[Claims for Utility Model Registration] A small flat motor in which a stator field magnet and a rotor are opposed to each other through an axial gap, the field magnet having a central hole formed on the bracket mounting surface of the field magnet, and a center hole of the field magnet. A pair of grooves extending radially from the periphery of the field magnet, a central ring portion and a pair of protrusions extending radially from the periphery of the center ring portion, to which the feeding brush is attached, are arranged in the center hole of the field magnet, and a brush holding plate that arranges the protruding parts of the bracket in the pair of grooves, and a recessed step provided in the center of the bracket to allow the soldering part of the central ring part to escape; A small flat motor, characterized in that the pair of protrusions of the brush holding plate are clamped and fixed by being attached to the brush holding plate.