Study of cogging torque in permanent magnet machines

Author

Studer, C. ; Keyhani, A. ; Sebastian, T. ; Murthy, S.K.

Author_Institution

Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA

Volume

1

fYear

1997

fDate

5-9 Oct 1997

Firstpage

42

Abstract

Cogging torque is produced in a permanent magnet machine by the magnetic attraction between the rotor mounted permanent magnets and the stator. It is an undesired effect that contributes to the machines output ripple, vibration, and noise. This paper analyzes various cogging torque minimization techniques as applied to a permanent magnet machine used in an electric power steering system. A six pole, eighteen slot, surface mounted, rare earth type, brushless permanent magnet machine is analyzed. The resultant cogging torque values are computed using a two dimensional finite element analysis package

Keywords

brushless machines; finite element analysis; machine theory; minimisation; permanent magnet motors; rotors; stators; torque; cogging torque; cogging torque minimization; electric power steering system; magnetic analysis; magnetic attraction; noise; output ripple; permanent magnet machines; rare earth brushless permanent magnet motor; rotating machine nonlinear analysis; rotor mounted permanent magnets; six pole eighteen slot PM motor; stator; two dimensional finite element analysis; vibration; Finite element methods; Forging; Magnetic analysis; Magnetic noise; Packaging machines; Permanent magnet machines; Permanent magnets; Stators; Steering systems; Torque;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE

Conference_Location

New Orleans, LA

ISSN

0197-2618

Print_ISBN

0-7803-4067-1

Type

conf

DOI

10.1109/IAS.1997.643006

Filename

643006