Title :
Measurement and reduction of EMI radiated by a PWM inverter-fed AC motor drive system
Author :
Ogasawara, Satoshi ; Ayano, Hideki ; Akagi, Hirofumi
Author_Institution :
Dept. of Electr. Eng., Okayama Univ., Japan
Abstract :
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
Keywords :
PWM invertors; electromagnetic interference; induction motor drives; interference suppression; 3.7 kW; PWM inverter-fed AC motor drive system; VDE 0871 Class A; common-mode currents; common-mode transformer; equivalent model; induction motor drive system; normal-mode currents; normal-mode filters; parasitic stray capacitors; radiated EMI measurement; radiated EMI reduction; voltage-source PWM inverter; Current measurement; Electromagnetic induction; Electromagnetic interference; Electromagnetic measurements; Electromagnetic radiation; Induction motor drives; Noise measurement; Noise reduction; Pulse measurements; Pulse width modulation inverters;
Journal_Title :
Industry Applications, IEEE Transactions on
