Patent ID: 6747386
Filing Date: 2004-06-08
Classification: H02K

Abstract:
A core for use in a motor, said motor including N and S magnetic poles for generating a magnetic field to which said core is opposed, said core comprising:a plurality of slots formed in said core, said slots have an electrical angle which is one of: a) between 80 degrees and 95 degrees; and b) between 20 degrees and 35 degrees a number of said magnetic poles is 2m and a number of said slot is 3n (m and n are integers, m is greater than or equal to 4)wherein said core is configured by combining P core shapes each having their respective slots displaced by an angle equal to one-2P-th the cycle of basic cogging torque ((180/nÂ·k)Â° in mechanical angle, where k is a least common multiple of 2m and 3n).