A method for reduction of cogging torque in brushless DC motor considering the distribution of magnetization by 3DEMCN

Author

Hur, Jin ; Hyun, Dong-seok ; Hong, Jung-Pyo

Author_Institution

Dept. of Electr. Eng., Hanyang Univ., Seoul, South Korea

Volume

34

Issue

5

fYear

1998

fDate

9/1/1998 12:00:00 AM

Firstpage

3532

Lastpage

3535

Abstract

A method of reducing cogging torque and improving average torque has been studied by changing the dead zone angle of trapezoidal magnetization distribution of the ring type rotor magnet in a brushless DC motor (BLDCM). Because the BLDCM has a 3-D shape of its overhang, 3-D analysis should be used for exact computation of its magnetic field. A 3-D equivalent magnetic circuit network method (3-D EMCN) which can analyze an accurate 3-D magnetic field has been introduced. The analysis results of cogging torque using this 3-D EMCN are compared with those of the 3-D finite element method (3-D FEM) and experimental data

Keywords

brushless DC motors; equivalent circuits; machine theory; magnetic circuits; magnetic fields; magnetisation; rotors; torque; 3-D equivalent magnetic circuit network method; 3-D magnetic field computation; 3-D overhang shape; average torque improvement; brushless DC motor; cogging torque reduction; dead zone angle; ring type rotor magnet; trapezoidal magnetization distribution; Brushless DC motors; Finite element methods; Forging; Magnetic analysis; Magnetic circuits; Magnetic fields; Magnetization; Rotors; Shape; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.717833

Filename

717833