Title of article :
Influence of DC-Link Voltage on Commutation Torque Ripple of Brushless DC Motors with Two-Segment Pulse-width Modulation Control Method
Author/Authors :
Gol ، S. Faculty of Electrical and Computer Engineering - Babol Noshirvani University of Technology , Ardeshir ، G. Faculty of Electrical and Computer Engineering - Babol Noshirvani University of Technology , Zahabi ، M. Faculty of Electrical and Computer Engineering - Babol Noshirvani University of Technology , Ale Ahmad ، A. Faculty of Electrical and Computer Engineering - Babol Noshirvani University of Technology
Abstract :
The commutation process causes current ripple to be generated in the drive system of brushless DC (BLDC) motor. This, in turn, leads to torque ripple that causes mechanical vibration and acoustic noise which are undesirable phenomenon in some applications. A new method is presented in this paper which reduces torque ripple and commutation period in the entire range of motor speed. This method is designed and implemented using two-segment pulse-width modulation (PWM) and DC-link voltage doubling during commutation. Based on the presented theory and given the influence of DC-link voltage on ripple magnitude, some experiments were carried out in which simultaneous contribution of the above mentioned factors in reducing current ripple and commutation time in the entire speed range of rotor are shown. The experimental results showed that the current ripple magnitude in high speed range is almost 20 times less than conventional method based on H-PWM_L-ON technique.
Keywords :
Brushless DC Motors , Motor Drive System , Commutation Torque Ripple , Pulse , width Modulation , DC , link Voltage
Journal title :
International Journal of Engineering
