Patent ID: 8853898

Claim:
An electrical rotating machine, comprising: a rotor having a field winding; a stator having a stator winding, arranged so as to surround the rotor; a housing having a load side end fixed to the stator, and which contains the rotor and the stator; and a heat sink assembly which is contained inside the housing, and in which switching elements, for controlling the field winding and the stator winding, are mounted on a heat sink of the heat sink assembly, wherein the heat sink assembly is fixed on an inner surface of an anti-load side end of the housing, having an insulating material for blocking heat transmission interposed therebetween, the anti-load side end being axially opposite to the load side end with respect to the heat sink assembly, wherein the insulating material only contacts the anti-load side end surface of the housing to provide an elongated path for heat generated by the stator winding.