Patent ID: 7648368

Claim:
An electrical-power-transfer assembly for transferring electrical power between a frame assembly and a rotating assembly that rotates relative to the frame assembly around a rotating axis, said electrical-power-transfer assembly comprising: a first race structure mounted to the frame assembly; a second race structure mounted to the rotating assembly; an electrical connection from the first race structure to the frame assembly and an electrical connection from the second race structure to the rotating assembly; a first raceway situated between the first race structure and the second race structure; a first set of rolling elements caged in the first raceway for rolling and sliding movement therewithin; and a current path established between the electrical connections, this current path passing through the first raceway and/or the first set of rolling elements; wherein the first race structure and the second race structure have facing axial faces and wherein the first raceway is formed by a circumferential groove in the axial face of the first race structure and/or a circumferential groove in the axial face of the second race structure.