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Noise Analyses of VVVF Inverter and DC/DC Converter for Maglev Train  

김현실 (한국기계연구원 음향그룹)
김재승 (한국기계연구원 음향그룹)
강현주 (한국기계연구원 음향그룹)
김봉기 (한국기계연구원 음향그룹)
김상렬 (한국기계연구원 음향그룹)
Publication Information
The Journal of the Acoustical Society of Korea / v.22, no.5, 2003 , pp. 337-344 More about this Journal
Abstract
In DC/DC converter and VVVF inverter, which are the must dominant noise sources of Maglev train, noise is radiated from core and coil excited by MS(Magnetostriction). The main noise source of DC/DC converter is transformer whose spectrum shows strong peaks associated with harmonics of exciting frequency, On the other hand, LIM/VVVF noise is dominated by the harmonics of switching frequency, whereas harmonics of exciting frequency are not significant. As switching frequency is increased in VVVF inverter, it is shown that the harmonics are shifted to higher frequency range. If switching frequency is increased from 700㎐ to 2 ㎑, It is measured that noise can be reduced by 5 to 6 ㏈. Since complete mathematical description of MS phenomena is far beyond the present technology, vibration spectrum is investigated qualitatively in this paper, where effect of increasing switching frequency is confirmed.
Keywords
Maglev train; VVVF inverter; DC/DC converter; Magnetostriction;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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