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Instantaneous magnetic field distribution in brushless permanent magnet DC motors. I. Open-circuit field

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4 Author(s)
Z. Q. Zhu ; Dept. of Electron. & Electr. Eng., Sheffield Univ., UK ; D. Howe ; E. Bolte ; B. Ackermann

An analytical technique for predicting the instantaneous magnetic field distribution in the airgap region of radial-field topologies of brushless permanent-magnet DC motors, under any specified load condition and accounting implicitly for the stator winding current waveform and the effect of stator-slot-openings, has been developed. It is based on the superposition of the component fields due to the permanent magnet and the stator excitation. A 2D analytical method for predicting the open-circuit airgap field distribution in both internal and external rotor radial-field motor topologies is presented. It involves the solution of the governing field equations in polar coordinates in the annular airgap/magnet region of a multipole slotless motor in which the magnets are assumed to have uniform radial magnetization and a constant relative recoil permeability. Results for various radial-field motors are compared with predictions from corresponding finite element analyses

Published in:

IEEE Transactions on Magnetics  (Volume:29 ,  Issue: 1 )