JPH0318248A - Terminal holding structure for dc micromotor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a small DC motor used in audio equipment, industrial equipment, etc., and particularly relates to a terminal holding structure thereof.

BACKGROUND OF THE INVENTION A conventional terminal holding structure for a small direct current motor will be described below with reference to FIGS. 3 and 4.

FIG. 3 shows the terminals of a conventional small DC motor, where 1 is a terminal and 2 is a brush. Figure 4 shows the brush holding structure of a conventional small DC motor.
3 is a ring-shaped magnet, 4 is a commutator, and 5 is a terminal holder.

The operation of the terminal holding structure configured as described above will be explained below.

In the above structure, the terminal 1 is press-fitted into a groove formed in a terminal holder 5 made of resin and arranged on a motor bracket. At this time, the terminal 1 is provided with ribs 6 to improve the holding strength, as shown in FIG.

Problems to be Solved by the Invention However, in the configuration described above, since the terminal 1 is held only by the terminal holder 5, the holding strength of the terminal 1 is weak, and the terminal 1 may be damaged by external force such as falling. It gets inside the motor, and the brush 2 and commutator 4 do not come into contact with each other in their normal positions.
This can easily affect the motor characteristics. Further, the terminal holder 5 needs to be an insulator, and is mostly made of resin. For this reason, when heat is applied during soldering or the like when connecting terminal lead wires, the resin becomes soft due to the heat, and terminal 1 moves with a small amount of force, causing problems in the motor's characteristics. .

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a small motor with an improved terminal holding structure.

Means for Solving the Problems To achieve this object, the small DC motor of the present invention has the following features:
The terminal has a structure in which a bent portion is provided on the inside of the motor, and the bent portion is brought into contact with the end face of the magnet.

Function: Due to the above structure, the terminal is press-fitted into the terminal holder and the bent part of the terminal is held in contact with the end face of the magnet, increasing the holding power of the terminal against external force and thermal force applied to the terminal. movement can be prevented.

Embodiment Hereinafter, an embodiment of a terminal holding structure for a small DC motor according to the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows an embodiment of the terminals of a small DC motor according to the present invention, where 1 is a terminal and 2 is a brush.

FIG. 2 shows a terminal holding structure of a small DC motor according to an embodiment of the present invention, in which 1 is a terminal, 2 is a brush, 3 is a magnet, 4 is a commutator, 5 is a terminal holder, 7 is a bent part, 8 is the bracket. Note that the same names as in the conventional example are given the same numbers.

The terminal holding structure designed as described above will be explained below.

In the above configuration, the terminal 1 made of a conductive material with a good film has one end bent at a right angle to form a bent part 6, and the other end has a brush 2 made of an elastic conductive material. has been set up. This terminal 1 is fixed to a terminal holder 5 made of resin and held by a bracket 7 by press fitting or the like. At this time, the bent portion 6 of the terminal 1 provided perpendicularly inside the motor comes into contact with the end surface of the ring-shaped magnet 3 and is held against movement in the axial direction. Further, since the magnet 3 uses a magnet, dimensional errors in the abutment area are absorbed by the magnet, and a normal pressed state is always maintained.

Due to the above-mentioned precautions, even if the terminal 1 is subjected to an impact such as being dropped, the bent part is held in contact with the end face of the magnet 3, so the terminal 1 will not get stuck inside the motor. It becomes difficult.

Furthermore, if heat is applied to the terminal 1 due to soldering etc., even if the resin of the terminal holder 5 becomes soft due to the heat, it will be difficult to move and the positional relationship between the brush 2 and commutator 4 will not change, which will affect the motor characteristics. As mentioned above, it is possible to improve motor quality and simplify assembly work.

As described above, the terminal is provided with a bent portion in the direction perpendicular to the inside of the motor, and the bent portion is brought into contact with the end face of the magnet, thereby providing a terminal that can sufficiently withstand mechanical and thermal forces applied to the terminal. You can easily obtain a small DC motor with strong holding strength.
It has a great effect on improving quality and workability.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the terminal of the present invention, Fig. 2 is a diagram showing a terminal holding structure of a small DC motor which is an embodiment of the invention, and Fig. 3 is a diagram showing a terminal holding structure of a small DC motor of a conventional example. FIG. 4 is a diagram showing a terminal holding structure of a conventional small DC motor. 1...Terminal, 2...Brush, 3...
...Magnet, 4... Commutator, 5...
・Terminal holder, 7...Bending part, 8...
·bracket.

Claims (1)

[Claims] A terminal holding structure for a small DC motor in which a bent part is provided on the inside of the motor of the terminal held in a terminal holder, and the bent part is brought into contact with the end face of a magnet.