Electric brush for direct current traction motor

Abstract

The invention discloses an electric brush for a direct current traction motor. The electric brush comprises two pieces of carbon brushes (1), four annealed copper braided wires (2) and a triangular cushion block (3). The triangular cushion block (3) is disposed above the two pieces of carbon brushes (1). The triangular cushion block (3) is provided with through holes (31) for the annealed copper braided wires which penetrate through the trough holes (31) respectively to be fixedly connected with carbon brushes (1). Due to the fact that the mechanism with two pieces of carbon brushes coordinating with the triangular cushion block is used, reversing of the motor is improved effectively, good afflux performance is provided, sparks are limited in an acceptable range, energy loss is low, a layer of uniform, appropriate and stable oxidation film can be formed on a commutator surface rapidly during operation, the service life of electric brush is further prolonged, the unhealthy phenomenon of an original integral-structured motor can be eliminated or reduced, and reliable and safe operation of the motor is guaranteed.

Description

technical field [0001] The invention relates to the technical field of traction motors, and more specifically relates to a brush for a DC traction motor. Background technique [0002] The brush is the key component of the DC motor, and it is the sliding contact body that conducts current for other motors except the rat dragon motor. In the DC motor, it is also responsible for commutating (rectifying) the alternating electromotive force induced in the armature winding. Practice has shown that the reliability of motor operation depends to a large extent on the structural design of the brushes. [0003] Many electric locomotives carrying goods on railways are powered by DC motors. At present, the brushes used are installed at the bottom of four copper soft braided wires in the four small holes on the top of two carbon brush blocks, and are fixed in the carbon brushes through caulking glue, and the pulling force is not less than the brush standard The regulations, and the two...

AI Technical Summary

Problems solved by technology

In addition, this type of brush will also have a dull dark area on the working surface of the bottom of the two carbon brushes, there are 2 to 3 wear interfaces on the bottom of the carbon brush, and the wear of the two carbon brushes is not equal, resulting in the work at the bottom of the two carbon brushes. The phenomenon that the surface cannot freely reach the appropriate position on the commutator surface and cannot completely match with the commutator surface.

On the other hand, the pressure of the scroll spring on the carbon brush is often concentrated in a local position, so that the commutation of the motor is unstable, the current distribution is unbalanced, and the local vibration of the brush is concentrated, which shows the above-mentioned undesirable phenomenon.

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