Open-circuit field distribution in a brushless motor with diametrically magnetised PM rotor, accounting for slotting and eddy current effects

Author

Ng, K. ; Zhu, Z.Q. ; Howe, D.

Author_Institution

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

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

5070

Lastpage

5072

Abstract

An analytical model has been developed for calculating the open-circuit time-varying magnetic field distribution in the airgap/magnet/retaining sleeve region of a brushless permanent magnet motor equipped with diametrically magnetised magnets. It accounts for the stator slotting and curvature, as well as for parasitic eddy currents induced in the retaining sleeve and magnets. The analytically predicted time-varying field distribution in the different regions is compared with corresponding finite element predictions

Keywords

brushless machines; eddy currents; machine theory; magnetic fields; permanent magnet motors; rotors; airgap/magnet/retaining sleeve; analytical model; brushless motor; diametrically magnetised magnet; open-circuit time-varying magnetic field distribution; parasitic eddy current; permanent magnet rotor; stator curvature; stator slotting; Analytical models; Angular velocity; Boundary conditions; Brushless motors; Equations; Frequency; Magnetic flux; Magnetization; Permanent magnet motors; Rotors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539493

Filename

539493