How to prevent brush sparks of DC motors

DC motors have a wide range of applications in today's life. Everyone should be familiar with this product. In normal use, we should pay attention to its operating specifications. If used improperly, it may have a bad influence on the equipment. Among them, brush sparks may have been encountered by friends. In normal times, we should learn to prevent:

1. Install the commutating pole and offset by commutating the pole potential.

2. The brush should be reasonably selected, and the contact resistance between the brush and the surface of the commutator should be as large as possible, and the wear resistance of the brush should be good. Therefore, in DC motors, electrochemical graphite brushes are generally used. If the motor is difficult to commutate, a split brush should be used.

3, the pressure of the brush should be adjusted well, if the pressure is too tight, then it will increase the wear of the brush and commutator. However, if the pressure is too loose, the contact between the brush and the commutator will be poor, which may cause some problems. Moreover, the inner surface of the brush holder should be smooth and flat, without problems such as burrs, and the inner hole roughness should be less than 2um.

4, the material and model of the brush, to choose the right, is generally determined according to the operating conditions of the generator, in addition to parameters and other aspects, can not be ignored.

5. The number of positive and negative brushes should be equal, and during the installation process, the brush distance between the brushes should be equal, and the contact between the brush and the collector ring should be good.

Need to remind everyone that in the future to prevent DC brush sparks, you must choose measures for your own situation, in order to achieve twice the result with half the effort, I hope the above content can help everyone.