Patent ID: 8368265

Claim:
An electric motor comprising: a motor housing including a heat conductive tube body that extends in an axial direction, said tube body having opposite inner and outer annular surfaces, and first and second open ends opposite to each other in the axial direction; a rotor unit disposed rotatably in said motor housing and including a rotor shaft mounted rotatably within said motor housing and rotatable relative to said motor housing about a central axis of said tube body, said rotor shaft having a first end portion, a second end portion opposite to said first end portion in the axial direction, and an intermediate portion interconnecting said first and second end portions, said second end portion having a diameter greater than that of said intermediate portion, a heat conductive magnet-mounting seat mounted in a sleeved relationship to said intermediate portion of said rotor shaft, a magnet member mounted in said magnet-mounting seat, and a plurality of heat pipes angularly spaced apart from each other about the central axis, and extending in the axial direction through said second end portion of said rotor shaft and into said magnet-mounting seat, each of said heat pipes having an end portion disposed outwardly of said second end portion of said rotor shaft; a stator unit mounted fixedly in and in thermal contact with said motor housing, and disposed around said rotor unit; and a heat conductive impeller connected to said second end portion of said rotor shaft such that said impeller is co-rotatable with said rotor shaft, said end portions of said heat pipes extending into and being in thermal contact with said impeller.