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Suppression of Torque Ripple in BLDCM

Liao Jun-hui

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Abstract

Brushless DC motor system has the advantages such as high torque current ration,high ratating speed,good dynamic performance,reliable and easy to control,so it is widely used in small and medium-sized power-driven applications.But it has the disadvantage of large torque ripple,which constrains the application of the Brushless DC motor.In this paper,the torque ripple of brushless DC motor is analyzed in detail,the HPWM-LON influence on the commutation torque ripple of brushless DC motor is analyzed in detail.A method of directly facing torque ripple to compensate torque ripple is proposed.Based on the theory above,Pspice simulation mode is built.Analysis and comparison of simulation results show,that this compensation method can effectively suppress the torque ripple,improve the accuracy,and eliminate the noise caused by torque ripple.

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What this paper is about

Brushless DC motor system has the advantages such as high torque current ration,high ratating speed,good dynamic performance,reliable and easy to control,so it is widely used in small and medium-sized power-driven applications.But it has the disadvantage of large torque ripple,which constrains the application of the Brushless DC motor.In this paper,the torque ripple of brushless DC motor is analyzed in detail,the HPWM-LON influence on the commutation torque ripple of brushless DC motor is analyzed in detail.A method of directly facing torque ripple to compensate torque ripple is proposed.Based on the theory above,Pspice simulation mode is built.Analysis and comparison of simulation results show,that this compensation method can effectively suppress the torque ripple,improve the accuracy,and eliminate the noise caused by torque ripple.

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Available abstract

Brushless DC motor system has the advantages such as high torque current ration,high ratating speed,good dynamic performance,reliable and easy to control,so it is widely used in small and medium-sized power-driven applications.But it has the disadvantage of large torque ripple,which constrains the application of the Brushless DC motor.In this paper,the torque ripple of brushless DC motor is analyzed in detail,the HPWM-LON influence on the commutation torque ripple of brushless DC motor is analyzed in detail.A method of directly facing torque ripple to compensate torque ripple is proposed.Based on the theory above,Pspice simulation mode is built.Analysis and comparison of simulation results show,that this compensation method can effectively suppress the torque ripple,improve the accuracy,and eliminate the noise caused by torque ripple.

Key concepts: Torque ripple, Control theory (sociology), Direct torque control, Torque limiter, Switched reluctance motor, DC motor, Torque, Damping torque

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