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Energies 2017, 10(11), 1735;

A New Approach of Minimizing Commutation Torque Ripple for BLDCM

Shaanxi Key Laboratory of Small & Special Electrical Machine and Drive Technology, Northwestern Polytechnical University, Xi’an 710072, China
Xi’an Flight Automatic Control Research Institute, Xi’an 710065, China
Author to whom correspondence should be addressed.
Received: 21 August 2017 / Revised: 14 September 2017 / Accepted: 26 October 2017 / Published: 30 October 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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The properties of brushless DC motor (BLDCM) are similar to the fractional, slot-concentrated winding of permanent-magnet synchronous machines, and they fit well for electric vehicle application. However, BLDCM still suffers from the high commutation torque ripple in the case of the traditional square-wave current control (SWC) method, where the current vector rotates asynchronously with back-EMF. A current optimizing control (COC) method for BLDCM is proposed in the paper to minimize the commutation torque ripple. The trajectories of the three phase currents are planned by the given torque and the optimized result of the copper loss and motor torque equations. The properties of COC are analyzed and compared with that of SWC in the stationary reference frame. The results show that the way of making the current vector rotate synchronously with back-EMF (back-Electromotive Force) can minimize the modulus and velocity of the current vector in the commutation region, and reduce the torque ripple. Experimental tests obtained from an 82 W BLDCM are done to confirm the theoretical findings. View Full-Text
Keywords: BLDCM; commutation torque ripple; rotating synchronously; current optimizing control BLDCM; commutation torque ripple; rotating synchronously; current optimizing control

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Tan, B.; Hua, Z.; Zhang, L.; Fang, C. A New Approach of Minimizing Commutation Torque Ripple for BLDCM. Energies 2017, 10, 1735.

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