Patent ID: 6700236
Filing Date: 2004-03-02
Classification: H02K

Abstract:
A liquid-cooled vehicle rotary electric machine operable in a motor mode or a generator mode, comprising:a frame having an inner periphery, an outer periphery and a liquid passage that is disposed between said inner periphery and outer periphery; a stator core having an outer periphery fixedly fitted to said inner periphery of said flame, opposite core ends and a plurality of slots; a multi-phase stator winding accommodated in said plurality of slots, said stator winding including a plurality of U-shaped conductor segments each of which has a turn portion and a pair of legs each of which is inserted in a slot and connected to another at one of said core ends to form a joint coil end; and a rotor rotatably supported by said frame and disposed inside said stator core so as to electro-magnetically connect said stator core, wherein: said liquid passage is disposed near said joint coil end, said rotor has a plurality (P) of different magnetic poles alternately disposed at prescribed intervals in the circumferential direction thereof, said plurality of slots is disposed in said stator to increase contact area of said U-shaped conductor segments with slot inner walls, the number of said slots is equal to or larger than two times as many as the product of the number of said magnetic poles and the number of the phase of said stator, and said stator winding has a plurality of conductor segments extending in a circumference around the turn portions of said U-shaped segments to be welded together to form a neutral point.