Patent ID: 7701108

Claim:
A collector ring unit comprising: a base; a plurality of insulated spacer rings sleeved onto the base, each insulated spacer ring having a ring body, a spacer fringe protruding from an outer circumference of the ring body, a shaft hole at a center of the ring body, a plurality of through holes through the ring body and spaced around the shaft hole, and a notch formed on the ring body; a plurality of conductive slip rings, the number of which is the same as the number of the insulated spacer rings, each conductive ring being sleeved onto an outer circumference of the ring body of one of the insulated spacer rings and having a socket located in the notch of the associated insulated spacer ring; and a plurality of conductive strips, the number of which is the same as the number of the conductive slip rings, each conductive strip having one end inserted into the socket of one of the conductive slip rings and the other end passing through the through holes of the other insulated spacer rings and protruded out of the outermost insulated spacer ring.