Electric erosion damage form of representative for traction motor bearings, for bearing maintenance simplification (long-term) and maintenance-free hinder greatly.

Electric erosion is bearing inside is energized in rotation, through the rolling contact department very thin oil film produced by edm, partial melting of a kind of damage. As the countermeasures of electric erosion is set beside the road electric current flow to the bearing external, or around the bearing or its insulation to interrupt current, specific practices are as follows.

(1) in the traction motor spindle or chassis grounding device installation, made the current without bearing the internal.

(2) using insulation bracket or insulation bearing.

At present, from the aspects of price and reliability, give priority to with "insulation bearing" way. Practical traction motor insulation bearing

Has the following three:

1) composite ceramic bearing;

(2) ceramic coating bearing;

(3) resin film bearing.

Composite ceramic bearing is expensive, resin film bearing is cheap but quality assurance degree is not high, only ceramic coating are the distinctive features of bearing with high quality and low price.