The analysis of the serious wear of the motor slip ring by the brush is as follows: the brush first wears the collector ring, destroys the shiny surface of the slip ring, continues to wear to form a rough surface and the concentricity exceeds the standard and a vicious circle appears. The brush breaks the running surface of the collector ring to form a roughness. On the contrary, the roughening of the collector ring faces the crazy wear of the brush, so that the brush generates a large amount of toner. The toner forms a conductor on the collector ring insulator, causing severe arcing, short circuit, burning of the collector ring and others. The brush and the slip ring were broken.

Grounding brush (negative brush) failure analysis: the grounding brush damages the grounding collector ring to a rough surface, the grounding collector ring is rough and fragile and wears the grounding brush, the grounding brush appears a lot of metal carbon powder, and the short circuit occurs seriously. When the insulator is burned, the life of the grounding brush is rapidly reduced.

Analysis of the damage of the main bearing of the generator by the grounding brush: the grounding brush destroys the grounded collector ring and wears it into a rough surface. The brush and the collector ring are bounced, sparked, and poorly contacted. The grounding brush cannot Normally derive current. The ground current is transferred to the main bearing of the motor for conductive flow. The main bearing appears to spark, if it continues to run, the main bearing burns, the bearing has a gap. The spindle jumps and the motor vibrates excessively. The amount of grounding brush is related to the life of the collector ring and the main bearing of the generator.