NDLI: Shaping the SPL spectra of the acoustic noise emitted by inverter-fed induction motors

Content Provider	IEEE Xplore Digital Library
Author	Cichowski, A. Nieznanski, J. Wolejko, M. Wojewodka, A.
Copyright Year	2003
Description	Author affiliation: Fac. of Electr. & Control Eng., Gdansk Univ. of Technol., Poland (Cichowski, A.; Nieznanski, J.; Wolejko, M.; Wojewodka, A.)
Abstract	Acoustic noise emissions from PWM-VSI driven induction motors is a serious environmental problem. This paper reports on a novel approach to alleviating this problem by influencing the spectra of the sound pressure level (SPL) of the emitted noise. The main objective of the method is a reduction of the effect of mechanical resonances on the resultant SPL spectra. In the first step, the resonances are being identified by using a random pulse width modulation (RPWM) with a uniform probability density function (PDF) of the carrier frequency or, alternatively, by using the sigma-delta modulation (SDM); in the latter case, the current spectrum is inherently flat. Then, the target PDF is being constructed so as to account for the machine properties (notably by avoiding mechanical resonances). The initial results obtained using this approach are promising, particularly in terms of lower acoustic power concentrated in the vicinity of resonance frequencies (as compared to the case of uniform PDF). The resultant noise profile is less annoying to the human ear. Moreover, the total SPL can also be reduced.
Sponsorship	IEEE Industrial Electronics Soc
Starting Page	2923
Ending Page	2928
File Size	370417
Page Count	6
File Format	PDF
ISBN	0780379063
DOI	10.1109/IECON.2003.1280712
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-11-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic noise Induction motors Pulse width modulation Resonance Environmental factors Working environment noise Noise shaping Noise level Space vector pulse width modulation Probability density function
Content Type	Text
Resource Type	Article

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