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Design aspects of a high-speed sensorless brushless dc motor using third harmonic back-emf for sensorless control

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4 Author(s)
Wang, Kai ; College of Electrical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China ; Jianxin Shen ; Zhou, Fengzheng ; Weizhong Fei

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There is increasing interest in high-speed permanent magnet (PM) brushless dc motors for a wide range of applications. Back-emf is often utilized for sensorless operation of permanent magnet brushless dc motors, by detecting the emf zero crossings. However, in high-speed motors, the free-wheeling diode conduction can last more than 30 e deg. This can obscure the zero crossings of the phase EMF; therefore, it is preferable to utilize the third harmonic emf instead of the phase emf. In this paper, some design aspects related to this high-speed sensorless operation are presented, including a special nonoverlapping winding arrangement and magnet segmenting technique. Finally, the experimental results confirmed the validity of the proposed design method.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 7 )

Date of Publication:

Apr 2008

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