Rotary electric machine having partically delta-connected stator winding

摘要

A vehicular alternator has a stator winding, in which a middle point of one phase winding is connected to a winding finish end of another phase winding in a cyclic manner among the three-phase windings. A &Dgr;-connection portion is formed by a portion between the middle points and the winding finish ends of the respective phase windings and a Y-connection portion is formed by a portion other than the &Dgr;-connection portion. The output characteristic of the vehicular alternator is variable depending on a position of the middle point.