DocumentCode :
1301578
Title :
Noise quieting with random PWM AC drives
Author :
Covic, G.A. ; Boys, J.T.
Author_Institution :
Dept. of Electr. & Electron. Eng., Auckland Univ., New Zealand
Volume :
145
Issue :
1
fYear :
1998
fDate :
1/1/1998 12:00:00 AM
Firstpage :
1
Lastpage :
10
Abstract :
Acoustic noise radiated by industrial motor drives driven by PWM power electronic controllers is becoming ever more objectionable on industrial sites. The authors investigate such noise and show that the noise spectrum is closely related to the spectrum of the voltage waveform formed by the power electronics so that it may be “controlled” by controlling this voltage waveform. The paper describes a random PWM modulator and shows how it may be tailored within a prescribed band of switching frequencies to “smear” the voltage spectrum. Measured spectra and the results of listening tests are presented to show that significant perceived noise reductions are possible for relatively low switching bandwidths with but small computational overheads in the PWM generation
Keywords :
AC motor drives; PWM invertors; acoustic noise; harmonic distortion; machine testing; machine theory; power system harmonics; switching circuits; PWM generation; PWM power electronic convertors; acoustic noise radiation; harmonics; industrial motor drives; noise quieting; noise spectrum; random PWM modulator; random PWM scheme; switching bandwidth; voltage waveform spectrum;
fLanguage :
English
Journal_Title :
Electric Power Applications, IEE Proceedings -
Publisher :
iet
ISSN :
1350-2352
Type :
jour
DOI :
10.1049/ip-epa:19981533
Filename :
655166
Link To Document :
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