Measurement and reduction of EMI radiated by a PWM inverter-fed AC motor drive system

This paper presents theoretical and experimental relationships between radiated electromagnetic noises and common-mode and normal-mode currents, paying attention to an induction motor drive system fed by a voltage-source pulsewidth modulation (PWM) inverter. A method of reducing both currents is pro...

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Bibliographic Details
Published inIEEE transactions on industry applications Vol. 33; no. 4; pp. 1019 - 1026
Main Authors Ogasawara, S., Ayano, H., Akagi, H.
Format Journal Article
LanguageEnglish
Published IEEE 01.07.1997
Subjects
Current measurement
Electromagnetic induction
Electromagnetic interference
Electromagnetic measurements
Electromagnetic radiation
Induction motor drives
Noise measurement
Noise reduction
Pulse measurements
Pulse width modulation inverters
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Summary:This paper presents theoretical and experimental relationships between radiated electromagnetic noises and common-mode and normal-mode currents, paying attention to an induction motor drive system fed by a voltage-source pulsewidth modulation (PWM) inverter. A method of reducing both currents is proposed, based on an equivalent model, taking into account parasitic stray capacitors inside an induction motor. Electromagnetic interference (EMI) radiated by a 3.7-kW induction motor drive system is actually measured, complying with the VDE 0871 Class A [3 m]. Experimental results verify that the combination of the already proposed common-mode transformer (CMT) and the normal-mode filters (NMFs) being proposed in this paper is a practically viable and effective way to reduce EMI resulting from both common-mode and normal-mode currents.
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ISSN:0093-9994
1939-9367
DOI:10.1109/28.605744