The effects of the distribution of residual magnetization on the cogging torque and switching signals in permanent magnet (PM) motors

Author

Koh, Chang Seop ; Kang, Byung-Kil ; Ryu, Jae-Seop ; Seol, Jin-Soo

Author_Institution

Sch. of Electr. & Comput. Eng., Chung-Buk Nat. Univ., Cheongju, South Korea

Volume

38

Issue

2

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1217

Lastpage

1220

Abstract

A novel cogging torque reduction method is presented for permanent magnet (PM) motors. The key idea of the method is optimizing the distribution of residual magnetic flux density of the PM by putting auxiliary slots on the pole face of the magnetizing yoke. Through the three-dimensional (3-D) finite-element simulation with edge elements and nodal force method for the motor having eight PM poles and six winding slots, the effectiveness of the presented method is proved. The effects on the switching signal are also investigated

Keywords

finite element analysis; machine theory; magnetic flux; magnetisation; permanent magnet motors; switching; torque; 3-D finite-element simulation; PM motors; PM poles; auxiliary slots; cogging torque reduction method; edge elements; magnetizing yoke; nodal force method; not-fully-magnetized zone; permanent magnet motors; pole face; residual magnetic flux density distribution; residual magnetization distribution effects; switching signal; three-dimensional finite-element simulation; winding slots; Finite element methods; Forging; Magnetic cores; Magnetic flux; Magnetic flux density; Magnetic switching; Magnetization; Optimization methods; Permanent magnet motors; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.996311

Filename

996311