JPH0567177U - Carbon brush to notify end of wear - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] The rotary working surface (commutator) is heated, burnt and melted.
Providing a carbon brush that prevents the destruction of the circuit by informing the process of becoming unusable. [Structure] Dispose the non-conductive part in the carbon brush,
The lead wire 1 is placed on the rotary friction surface side of the joint portion 2 and has a hardness higher than that of carbon.
A carbon brush that exposes 4 non-energized pieces.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention also relates to carbon brushes used in electric motors and generator motors.

[0002]

[Prior Art]

 Conventionally, the method of using a carbon brush has been to pressurize it with a spring (not shown), and even if carbon is lost due to friction and wear, it will continue to be pressurized, and as a result, it will be used for lead wire joints. Since the contact area between the copper metal and the motor rotating commutator is small and the rotating commutator is energized intermittently, electric sparks occur, the contact surface is heated, burned, melted, and as a result the motor is It was made unusable.

[0003]

[Problems to be solved by the device]

 As described in the prior art, when the carbon brush is rubbed and worn out, the contact point advances to the lead wire joint, and copper metal is used at the joint, which causes large current flow and rotary rectification. There was a large amount of intermittent current between the child and the electric spark, and the rotary commutator was heated, burned, and melted.

Therefore, in the present invention, at the end of the exhaustion of the carbon brush, the current to the rotary commutator is gradually cut off, the motor speed is reduced and the motor is stopped to notify the end of the brush to avoid heat generation, burnout, and melting. It is what

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention operates when the carbon brush is nearing the end of wear. Therefore, a non-current-carrying material (hereinafter, non-current-carrying piece) having a hardness higher than that of carbon is provided in the carbon brush. ..

[0006] A structure in which a thin plate having a non-current-carrying piece having a hardness higher than that of a carbon brush and having a semi-cylindrical shape as shown in Fig. 1- (3) is mounted face to face on both sides.

A structure in which a cylindrical diameter as shown in FIG. 2 (4) is integrally formed or a hole is inserted afterwards.

A structure having a trapezoidal bottom having a curved shape as shown in FIG. 3 (5) is adopted.

Since the non-energized coma is made harder than the hardness of carbon, the non-energized coma is exposed as the carbon wears.

Since there is still a current-carrying portion (carbon) around the exposed contact surface of the non-current-carrying piece, the rotational force is reduced, but it is not stopped and the wear is still advanced.

When the wear progresses and a completely non-energized coma appears, the energization is cut off and the rotary commutator is stopped to prevent melting and burning and inform the wear of the carbon brush.

[0012]

【Example】

 Examples will be described with reference to the drawings. Although the shape of the carbon brush has some differences depending on the purpose of the motor, the common point is that the cross section is mainly rectangular and most of them are rod-shaped.

First, a non-energizing piece is inserted or integrally formed at a position where the rotation is desired to be invested, but the position is placed parallel to the longitudinal direction of the brush cross section to fill the length, and the width has a remaining area of 25 Put it on the center line so that it becomes 30% to 30% (the remaining part becomes the current-carrying part).

The material condition of this non-conducting piece is that it is harder than carbon, but cement, ceramics, ceramics, hard resin, hard plastic, etc. are used.

There is also an external attachment method in addition to the internal insertion and embedding methods.

This is a method of completely covering the lead wire joint portion, but the carbon of the portion to be covered is shaped beforehand, and the non-conducting cap (FIG. 4- (6)) is covered on the portion.

In this method, the non-conducting cap is put over the lead wire joint portion by covering the lead wire, and the outer diameter at this time is made the same as the size of the carbon brush.

The action is to notify the end of wear of the brush by the fact that the carbon brush wears and the energization is cut off at this cap, the rotation of the motor stops and stops.

[0019]

[Effect of the device]

 The present invention is constructed as described above, and its effects will be described below.

First, when manufacturing is embedded from the beginning by integral molding. Processing temperature is high and resin-related ・ There are some points that are unsuitable for materials such as plastic, but when using these materials, it is not the integral molding method It is desirable to select the process mounting method.

Since these materials are easy to process, they are particularly suitable for a post-process mounting method, and thus have a feature that the processing cost can be relatively low.

When actually used, it was confirmed that the rotating commutator was worn depending on how it was roughened. This is a buffering action during the process until the rotation is stopped due to the frictional wear of the carbon brush.

Further, as a future research subject, a method of simultaneously polishing and shaping a rotary commutator by mixing an abrasive material having a fine particle size into a non-current-carrying piece due to this buffering effect can be considered.

On the other hand, when hard materials such as cement, ceramics, and ceramics are used, there is no particular problem with temperature conditions in that they are integrally molded. In addition, the post-process method can be incorporated by making a hole in the center, scraping the outer surface, and using an adhesive, etc., and can be processed by simple work.

Regarding the use, the outer diameter is exactly the same as the conventional size, and the usage can be the same as the conventional one. The rotation speed does not suddenly stop like in the case of a failure, but the rotation speed decreases and the force drops, Since it goes through a process of stopping soon, it is excellent in that it can be clearly distinguished from it.

[0026]

[Brief description of drawings]

[Fig. 1] ··· Perspective view of a carbon brush with a non-energized top of a thin plate shaped like a kamaboko

[Fig. 2] .... Perspective view and cross-section of a carbon brush integrally molded with a cylindrical non-current-conducting piece.

[Fig. 3] ··· Perspective view of a carbon brush integrally formed with a trapezoid-shaped non-energizing piece

[Fig. 4] ··· Perspective view of a carbon brush with the cap rattle of the non-energized top covered with lead wires

[Explanation of symbols]

1-Lead wire (copper wiring) 2-Copper metal part of lead wire 3-Single perspective view of non-energized piece of thin plate-shaped plate Perspective view of the non-energized piece of the shape is 5 ... Perspective view of the non-energized piece of the trapezoid is 6 ...

Claims (2)

[Scope of utility model registration request] 1. A non-conducting portion is arranged in a carbon brush and is placed on the rotary friction surface side of the joining portion (2) of the lead wire (1) and has a hardness higher than that of carbon. , A carbon brush that exposes the non-energized coma. 2. A carbon brush that prevents frictional wear from advancing friction wear to the lead wire joint portion by passing a non-energized cap (6), which is harder than the carbon brush, onto the lead wire joint portion (2) from the outside.