Shape optimization of closed slot type permanent magnet motors for cogging torque reduction using evolution strategy

Author

Chun, Jang-Sung ; Jung, Hyun-Kyo ; Yoon, Joong-Suk

Author_Institution

Sch. of Electr. Eng., Seoul Nat. Univ., South Korea

Volume

33

Issue

2

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

1912

Lastpage

1915

Abstract

The analysis of a permanent magnet-type AC servo motor with both a closed slot and a ring shape magnet is performed by using the finite element method (FEM). The saturation of the bridge-part connecting two slot teeth is considered for nonlinear analysis. The optimal design of the stator is presented for minimizing cogging torque. The torques, i.e. cogging and rated torques, are expressed in terms of vector potential computed by directly applying the Maxwell stress tensor formula. The minimization of cogging torque of sample model is achieved by using the (1+1) evolution strategy (ES) and the rated torque must be more than the specific value

Keywords

AC motors; design engineering; finite element analysis; genetic algorithms; machine theory; permanent magnet motors; servomotors; stators; torque; (1+1) evolution strategy; FEM; Maxwell stress tensor formula; bridge-part saturation; closed slot; cogging torque reduction; finite element method; nonlinear analysis; optimal design; permanent magnet-type AC servomotor; ring shape magnet; shape optimization; stator; vector potential; AC motors; Forging; Magnetic analysis; Performance analysis; Permanent magnet motors; Saturation magnetization; Servomechanisms; Servomotors; Shape; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.582663

Filename

582663