Patent ID: 6127763
Filing Date: 2000-10-03
Classification: H02K

Abstract:
An alternator for vehicle comprising:a stator composed of a stator core having a plurality of tooth edges and a stator winding;a rotor composed of a pole core having a cylindrical center core, a plurality of claw-pole-pieces alternately extending from opposite axial ends of said pole core in axial directions, a pair of disk yokes disposed between said center core and said claw-pole-pieces and a shaft fixed to said center core, a pair of cooling fans fixed to said opposite axial ends of said pole core and a field coil disposed between said center core, said pair of disk yokes and said claw-pole-pieces, whereineach of said tooth edges has circumferential width X,said plurality of claw-pole pieces are disposed in a cylindrical spaces having outside diameter R1 and inside diameter r1 and are separated from each other at circumferential distance Y,a ratio Y/x of said circumferential distance to said circumferential width is between 2 and 3.3, anda ratio r1/R1 of said inside diameter to said outside diameter is between 0.78 and 0.8.