Reduction of torque ripple due to phase current commutation in BLDC motor using two-level DC bus voltage
by Baby K. Binu; George Saly
International Journal of Industrial Electronics and Drives (IJIED), Vol. 1, No. 2, 2014

Abstract: The main focus of the work is the reduction of torque ripple due to phase current commutation in brushless DC (BLDC) motors. The evolution of torque ripple owing to phase current commutation is discussed and the governing equations are derived. It is observed that, current ripple and hence, torque ripple can be reduced by injecting additional voltage into the dc bus during commutation interval. The magnitude and duration of additional voltage, which has to be injected, are deduced from the expressions of motor phase currents. A new topology is proposed for this purpose in which a boosted voltage is obtained by charging and discharging an inductor during the 'buildup period' and 'freewheeling period' respectively. Simulations had been carried out in PSIM and an experimental set up made to validate the proposed topology. Results show a 60% reduction in torque ripple with an increased steady state speed. The proposed topology uses control strategies using digital gates which make the system control easier, and thus cost effective.

Online publication date: Thu, 24-Jul-2014

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