Patent ID: 8618714
Filing Date: 2013-12-31
Classification: H02K

Abstract:
1. A vehicular brushless AC generator, comprising: a rotor fixed to a shaft; a yoke, opposed to the rotor via a radially-formed air gap, the yoke comprising a thick ring portion fixed to an inner wall of a bracket for rotatably supporting the shaft, and a cylindrical portion formed in an inner circumferential side on an axial end face of the thick ring portion; a bobbin disposed to surround the axial end face of the thick ring portion of the yoke and an outer circumferential surface of the cylindrical portion so that an exciting coil can be wound around the bobbin; a plate extending radially outwardly from an end of the cylindrical portion, for joining the bobbin to the yoke; and a stator disposed outside the rotor, in which magnetic flux produced by the exciting coil propagates; wherein the bobbin is provided with a thick portion for extending a creeping distance, the thick portion being formed over all of an outer circumferential edge of the bobbin joined to the yoke and between the thick ring portion of the yoke and the bobbin.