Patent ID: 6311383
Filing Date: 2001-11-06
Classification: H02K,Y10T

Abstract:
A method of manufacturing an electric-machine rotor composed of a field coil having a pair of wire ends, a pair of pole cores each having a plurality of claw poles extending alternately from one pole core to the other to enclose said field coil, a plurality of auxiliary permanent magnets disposed in spaces formed between two of said claw poles, a shaft fixed to said pair of pole cores, and a pair of slip rings connected to said pair of wire-ends, said method comprising:assembling said field coil, said pair of pole cores, said auxiliary permanent magnets, said shaft, and said pair of slip rings into a unit;forming a pattern on a portion of said rotor to indicate the polarity of one of said claw poles when said field coil is energized;machining said unit to form a finished unmagnetized rotor, said pattern formed before said machining step; andsubsequently magnetizing said plurality of permanent magnets according to said pattern.