STATOR ASSEMBLY WITH BOTH COPPER CONDUCTORS AND ALUMINUM CONDUCTORS DISPOSED IN SAME SLOT FOR PHASE WINDING

摘要

A stator assembly for a multi-phase rotary electric machine includes a stator core and a stator winding routed through a plurality of circumferentially-spaced slots in the stator core. The slots each have a slot access that opens radially towards a central axis of the stator core. The stator winding includes first conductors formed of copper and second conductors formed of aluminum. The slots each include at least one of the first conductors and at least one of the second conductors with the at least one second conductor arranged radially closer to the slot access than the at least one first conductor. The second conductors near the slot access and the first conductors throughout the rest of the slot improve overall machine efficiency compared to using the first conductors alone. The improvement in efficiency using both the first and second conductors in each slot is particularly significant at high speeds.