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Effect of skew, pole count and slot count on brushless motor radial force, cogging torque and back EMF

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1 Author(s)
Hanselman, D.C. ; Maine Univ., Orono, ME, USA

Permanent magnet brushless motors are increasingly being used in high performance applications. In many of these applications, the acoustic noise and torque ripple characteristics of the motor are of primary concern. Because of this concern, it is important to understand the influence of the motor geometrical parameters of skew amount, pole count and slot count on the resulting motor characteristics of radial force, cogging torque and back EMF. While these relationships are understood intuitively and have been explored experimentally and predicted numerically, they have not been confirmed analytically for motors having any combination of skew amount, pole count and slot count. The paper fills this void by exploring these relationships analytically using a Fourier series. The influence of skew amount, pole count and slot count on motor radial force, cogging torque and back EMF are shown to confirm prior experimental and numerical results. More importantly, the derived analytical results provide valuable insight into the implications of common motor design choices

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:144 ,  Issue: 5 )

Date of Publication:

Sep 1997

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