Permanent magnet electric motor with reduced cogging torque

Details Permanent magnet electric motor with reduced cogging torque Permanent magnet electric motor with reduced cogging torque

2003-04-11

2008-03-11

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S112000, C310S254100, C310S216006

Reexamination Certificate

active

07342338

ABSTRACT:
A permanent magnet electric motor10comprises a rotor30provided with two stages of permanent magnets in the axial direction on an outer circumferential face of a rotor iron core, and having a shaft shifted by a stage skew angle θr in electrical angle to decrease a first frequency component of cogging torque in the circumferential direction of the rotor iron core between two stages of the permanent magnets, a stator iron core21of cylindrical shape provided with the stator winding for producing a rotating magnetic field causing the rotor30to be rotated, and a stator20dividing the stator iron core21into plural blocks in the axial direction, and shifted by a stage skew angle θs in electrical angle to decrease a second frequency component of the cogging torque in the circumferential direction of the stator iron core21.

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Japanese Office Action dated Oct. 2, 2007.

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