A novel PWM scheme to eliminate the diode freewheeling in the inactive phase in BLDC motor

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  • College of Electric Engineering, Zhejiang University, Hangzhou 310027, China;

Published date: 05 Jun 2006

Abstract

The brushless DC motor (BLDCM) with trapezoidal electromotive force (back-EMF) waveform is used widely. In principle, when the motor runs in the 120° conduction mode, two of the three phases are active while the other phase is inactive at all times. However, a ripple current occurs in the inactive phase due to the diode freewheeling during the non-commutation period in the traditional pulse width modulation (PWM) methods, which aggravates the torque ripples. A new PWM method is proposed in this paper to eliminate the diode freewheeling during the non-commutation period in the inactive phase. As a result, the torque ripple is suppressed using the proposed method. The simulation and experimental results are demonstrated to verify the validity of the proposed PWM method.

Cite this article

WEI Kun, HU Chang-sheng, ZHANG Zhong-chao . A novel PWM scheme to eliminate the diode freewheeling in the inactive phase in BLDC motor[J]. Frontiers of Electrical and Electronic Engineering, 2006 , 1(2) : 194 -198 . DOI: 10.1007/s11460-006-0019-y

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