Torque Ripple Research of Sine-wave Driving Brushless DC Motor

Based on the problem of the torque ripple which is generated by using square-wave to drive the brushless DC motor(BLDCM),this paper proposes a control strategy by using sine-wave to drive this motor to reduce the torque ripple,reduce the loss,and increase the operational efficiency.Comparing with square-wave driving BLDCM,it shows that sine-wave controlling strategy can better suppress torque ripple.The designed circuit has advantages of simple structure,low cost and high reliability.The experimental results show the control strategy is reasonable,correct and ef-fective,and it gains a good effect.Therefore,it proves that BLDCM can reduce the torque ripple by sine-wave driving,and can be used in an occasion of higher requirement for stability,and expands the scope of application of the motor.