Machine e.g. alternating current asynchronous electrical motor, for rail transit car, has fixed rim fixed to carcass outside extension of exterior space of bearings, and rotating rim fixed to shaft remote from internal ring of bearings

摘要

The machine e.g. electrical motor (2), has electrical continuity devices (16) comprising conductive grease located between electrically conductive fixed and rotating contact rims. The fixed rim is fixed to a carcass (4) outside an axial extension of an exterior space of bearings (8) along a direction of an axis (L) of a shaft (6). The rotating rim is fixed to the shaft remote from an internal ring of the bearings. The rims are made of aluminum alloy, copper alloy or steel. The grease is a lubricant loaded with graphite particles or nano-particles of aluminum/copper.