Reduction of cogging torque in interior-magnet brushless machines

Author

Zhu, Z.Q. ; Ruangsinchaiwanich, S. ; Schofield, N. ; Howe, D.

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK

Volume

39

Issue

5

fYear

2003

Firstpage

3238

Lastpage

3240

Abstract

An investigation into the cogging torque in a four-pole interior-magnet brushless machines having either a six-slot stator and a short-pitched nonoverlapping winding or a 12-slot stator and a full-pitched overlapping winding is described. It is shown by finite-element analyses and measurements that, by appropriately defining the pole-arc to pole-pitch ratio, the optimal pole-arc to pole-pitch ratio for minimum cogging torque, which has been derived for surface-mounted magnet machines, is equally applicable to interior-magnet machines.

Keywords

brushless machines; finite element analysis; permanent magnet machines; torque; 12-slot stator; cogging torque reduction; finite-element analyses; full-pitched overlapping winding; interior-magnet brushless machines; interior-magnet machines; optimal pole-are to pole-pitch ratio; pole-are to pole-pitch ratio; short-pitched nonoverlapping winding; six-slot stator; surface-mounted magnet machines; Brushless machines; Finite element methods; Forging; Machine windings; Magnetic analysis; Magnetic flux leakage; Magnetic materials; Permanent magnets; Stator windings; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.816733

Filename

1233357