Abstract
The most troublesome noise of electromagnetic origin in induction machines, the so-called magnetic noise, can be traced to radial forces and — in a much smaller measure — to tangential forces which occur when the air gap flux contains harmonic fluxes with pole pairs differing by a small integer. Such higher harmonic fluxes in the air gap are practically unavoidable and inherent in the design of induction machines. These fluxes are caused by the finite number of slots and phase belts as well as by saturation and eccentricity resulting in a nonuniform permeance of the air gap. The radial and possibly tangential forces originating in the harmonic fluxes set the iron core into vibration [1] and the noise caused by these force waves is generally in the frequency range of 500 to 3000 Hz, i.e., in the range where the human ear is most sensitive.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
E.A.Erdelyi, “Predetermination of the Sound Pressure Levels of Magnetic Noise in Medium Induction Motors, Ph.D.Thesis, University of Michigan, Ann Arbor, January 1955, IP-107.
E.F.Fuchs, G.A.Mc Naughton, “Comparison of First-Order Finite Difference and Finite Element Algorithms for the Analysis of Magnetic Fields, Parts I and II,” IEEE Trans. on Power Apparatus and Systems, May 1982, Vol.PAS-101, No.5, pp.1170–1201.
E.F.Fuchs, L.H.Chang, D.J.Roesler, J.Appelbaum, “Magnetizing Currents, Iron Losses and Forces of Three-Phase Induction Machines at Sinusoidal and Non-sinusoidal Terminal Voltages, Parts I and II,” IEEE Trans, on Power Apparatus and Systems, November 1984, Vol.PAS-103, No.11, pp.3303–3326.
R.Richter, “Elektrische Maschinen”, Vol.1, Julius Springer Verlag, Berlin, 1924.
E.F.Fuchs, L.H.Chang, J.Appelbaum, S.Moghadamnia, “Sensitivity of Transformer and Induction Motor Operation to Power Systems’s Harmonics,” Topical Report prepared for the Dept. of Energy, Washington DC, DOE-RA-50150–18, April 1983.
J.A.Stratton, “Electromagnetic Theory”, McGraw-Hill Book Company, Inc.New York and London, pp.153–155, 1941.
K.Reichert, H.Freundl, W.Vogt , “The Calculation of Forces and Torques Within Numerical Magnetic Field Calculation Methods,” paper presented at the Compumag Conference, London, 1976.
W.Geysen, H.De Jong, E.F.Fuchs, A.Van Ranst, “Flux Distribution in a Three-Phase Squirrel Cage Induction Motor”, Revue Electricité, Belgium, Vol.7, No.8, pp.201–208, 1973.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1988 Kluwer Academic Publishers
About this chapter
Cite this chapter
Fuchs, E.F., Roesler, D.J. (1988). Determination of the No-Load Currents and the Associated Winding and Iron-Core Forces of Saturable Induction Machines for Sinusoidal and Nonsinusoidal Terminal Voltages. In: Belmans, R., Binns, K.J., Geysen, W., Vandenput, A. (eds) Vibrations and Audible Noise in Alternating Current Machines. NATO ASI Series, vol 148. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2815-2_12
Download citation
DOI: https://doi.org/10.1007/978-94-009-2815-2_12
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7767-5
Online ISBN: 978-94-009-2815-2
eBook Packages: Springer Book Archive