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Synchronous Periodic Frequency Modulation Based on Interleaving Technique to Reduce PWM Vibration Noise

  • Zhang, Wentao (Department of Electrical Engineering, Harbin Institute of Technology) ;
  • Xu, Yongxiang (Department of Electrical Engineering, Harbin Institute of Technology) ;
  • Ren, Jingwei (Hangzhou Applied Acoustics Research Institute) ;
  • Su, Jianyong (Department of Electrical Engineering, Harbin Institute of Technology) ;
  • Zou, Jibin (Department of Electrical Engineering, Harbin Institute of Technology)
  • Received : 2019.03.28
  • Accepted : 2019.06.27
  • Published : 2019.11.20

Abstract

Ear-piercing high-frequency noise from electromagnetic vibrations in motors has become unacceptable in sensitive environments, due to the application of pulse width modulation (PWM) and in consideration of switching losses. This paper proposed a synchronous periodic frequency modulation (SPFM) method based on the interleaving technique for paralleled three-phase voltage source inverters (VSIs) to eliminate PWM vibration noise. The proposed SPFM technique is able to effectively remove unpleasant high-frequency vibration noise as well as acoustic noise more effectively than the conventional periodic carrier frequency modulation (PCFM) and interleaving technique. It completely eliminates the vibration noise near odd-order carrier frequencies and reduces the PWM vibration noise near even-order carrier frequencies depending on the switching frequency variation range. Furthermore, the SPFM method is simple to implement and does not employ additional circuits in the drive system. Finally, the effectiveness of the proposed method has been confirmed by detailed experimental results.

Keywords

References

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