Patent ID: 6661151
Filing Date: 2003-12-09
Classification: H02K

Abstract:
An alternator, comprising:a frame; a shaft; a stator coil fixed to the frame; a field coil fixed to the frame; a pair of pole cores each having a plurality of nail parts, respectively, the pole cores being supported rotatably by the frame through the shaft; a non-magnetic ring coupling the nail parts, wherein the nail parts are coupled adjacent to each other in a rotation direction of the pole cores; and a plurality of permanent magnets interposed between the nail parts and fixed to the non-magnetic ring, wherein one of the pole cores is fixed to the shaft and the other of the pole cores is fixed to the one of the pole cores through the ring, wherein at least one of the non-magnetic ring and each of the permanent magnets has a slit groove at a location of engagement therebetween and the non-magnetic ring has the slit grooves at a radially inner side thereof and the permanent magnets have the slit grooves at a radially outer side thereof and wherein the permanent magnets are arranged radially inside the non-magnetic ring.