Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (3): 317-324.DOI: 10.12068/j.issn.1005-3026.2021.03.003

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A PWM Modulation Method Used to Suppress Current Fluctuation of Brushless DC Motor

BIAN Chun-yuan, JIA Yu-long, XING Hai-yang, LIU Shang-yue   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2020-07-31 Revised:2020-07-31 Accepted:2020-07-31 Published:2021-03-12
  • Contact: BIAN Chun-yuan
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Abstract: In order to solve the current fluctuation problem of the brushless DC motor in the traditional half-bridge modulation mode, an improved PWM modulation strategy was proposed. First, the traditional H_OFF-L_PWM modulation method was analyzed in detail. Second, in order to reduce the current fluctuation in the H_OFF-L_PWM modulation mode, an improved H_OFF-L_PWM modulation strategy was proposed. This modulation strategy performs PWM chopping control on the switch tube of the lower bridge arm of the non-conduction phase in the non-freewheeling interval, so that the motor current is smoother, thereby further reducing the motor torque ripple. Finally, a simulation model of the brushless DC motor feedback power generation system was built on the PLECS simulation platform. Based on the TMS320F280049CPZS control chip, an experimental platform for the brushless DC motor feedback power generation system was built. Simulation and experimental results show that the proposed improved H_OFF-L_PWM modulation strategy can suppress the motor phase current fluctuations, thereby suppress the motor electromagnetic torque ripple.

Key words: brushless DC motor(BLDCM); feedback power generation; improved H_OFF-L_PWM; non-conducting phase freewheeling; current fluctuation

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