Unbalanced magnetic forces in permanent magnet brushless machines with diametrically asymmetric phase windings

Author

Ishak, D. ; Zhu, Z.Q. ; Howe, D.

Author_Institution

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

Volume

2

fYear

2005

fDate

2-6 Oct. 2005

Firstpage

1037

Abstract

A general analytical model, formulated in 2-D polar coordinates, is developed to predict the unbalanced magnetic force which results in permanent magnet brushless AC and DC machines having a diametrically asymmetric disposition of slots and phase windings. It is shown that the unbalanced magnetic force can be significant in machines having a fractional ratio of slot number to pole number, especially when the electric loading is high. The developed model is validated by finite element calculations on 9-slot/8-pole and 3-slot/2-pole machines.

Keywords

brushless machines; finite element analysis; machine windings; permanent magnet machines; 2D polar coordinates; diametrically asymmetric disposition; diametrically asymmetric phase windings; electric loading; finite element calculations; permanent magnet brushless machines; pole number; slot number; unbalanced magnetic forces; Analytical models; Brushless machines; Finite element methods; Machine windings; Magnetic analysis; Magnetic forces; Permanent magnets; Rotors; Stators; Torque;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005

ISSN

0197-2618

Print_ISBN

0-7803-9208-6

Type

conf

DOI

10.1109/IAS.2005.1518484

Filename

1518484