Finite element analysis of an interior-magnet brushless DC machine, with a step-skewed rotor

Author

Eastham, J.F. ; Ionel, D.M. ; Balchin, M.J. ; Betzer, T. ; Demeter, E.

Author_Institution

Bath Univ., UK

Volume

33

Issue

2

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

2117

Lastpage

2119

Abstract

The use of finite-element (FE) analysis as a tool for optimising the design of a new form of permanent-magnet electrical machine is described. In order to reduce unwanted torque and generated voltage pulsations, the rotor is divided into a number of separate sections that have both axial separation and different radial positions. FE analysis is employed to optimise: (i) spacer width between the rotor sections, and (ii) radial positioning of sections, in order to give minimum torque and voltage pulsation. In comparison with a single-section rotor, it was found that a 3-section rotor gave an 89% reduction in peak-to-peak torque pulsation. Where possible, the accuracy of the PE method was confirmed by comparison with experimental measurements

Keywords

DC machines; brushless machines; finite element analysis; machine theory; permanent magnet machines; rotors; torque; axial separation; finite element analysis; generated voltage pulsations; interior-magnet brushless DC machine; minimum torque; peak-to-peak torque pulsation; radial positions; rotor; spacer width optimisation; step-skewed rotor; unwanted torque reduction; voltage pulsation; Air gaps; Design optimization; Finite element methods; Magnetic analysis; Magnetic flux; Magnetic separation; Rotors; Stators; Torque; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.582742

Filename

582742