A Study of Maglev Train Inverter and Converter Noise

자기부상열차용 인버터 및 컨버터 소음에 관한 연구

  • 김현실 (한국기계연구원 음향연구그룹) ;
  • 김재승 (한국기계연구원 음향연구그룹) ;
  • 강현주 (한국기계연구원 음향연구그룹) ;
  • 김봉기 (한국기계연구원 음향연구그룹) ;
  • 김상렬 (한국기계연구원 음향연구그룹)
  • Published : 2002.11.01

Abstract

Noise of the VVVF inverter and DC/DC converter, which are the most dominant noise sources of maglev train at low speed, is studied, The coils inside inverter and converter are excited by electro-magnetic forces, which results in core vibration and generations of the noise. It is found that the spectra of the noise show many harmonics, where there exist several different fundamental frequencies. Some noise reducing techniques are known for the transformer noise such as changing stiffness and using different core materials, which make less electrostatic responses, and consequently less noise. In this study, it is shown that the most effective and feasible noise reducing method is to increase the switching frequencies of the inverter and converter, where peaks in higher frequency are significantly reduced.

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