Instantaneous magnetic field distribution in brushless permanent magnet DC motors. III. Effect of stator slotting

Author

Zhu, Z.Q. ; Howe, D.

Author_Institution

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

Volume

29

Issue

1

fYear

1993

fDate

1/1/1993 12:00:00 AM

Firstpage

143

Lastpage

151

Abstract

For pt.II see ibid., vol.29, no.1, p.136-142 (1993). A method for modeling the effect of stator slotting on the magnetic field distribution in the airgap/magnet region of a radial-field brushless permanent-magnet DC motor equipped with a surface-mounted magnet rotor is presented to allow the analytical prediction of the open-circuit, armature-reaction, and consultant magnetic field distribution under any specified load condition. It is shown that the conventional 1D relative permeance model, which is used extensively in the analysis of induction and synchronous machines, is inappropriate for permanent magnet motors, for which the proposed analytical method accounts for stator slot openings by the application of the conformal transformation method and a 2-D relative permanence function. The results of predictions from the analysis are compared with corresponding finite element analyses

Keywords

DC motors; machine theory; magnetic fields; permanent magnet motors; stators; 2-D relative permanence function; airgap/magnet region; armature-reaction; brushless permanent magnet DC motors; conformal transformation method; finite element analyses; instantaneous magnetic field distribution; open-circuit; radial-field motors; stator slotting; surface-mounted magnet rotor; Brushless DC motors; Conductors; DC motors; Magnetic analysis; Magnetic fields; Magnetic flux leakage; Permeability; Predictive models; Rotors; Stators;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.195559

Filename

195559