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Numerical investigation of the 3D vibrational behaviour of skewed induction machines due to rotating force waves

Bernhard Weilharter (Institute for Electrical Drives and Machines, Graz University of Technology, Graz, Austria)
Oszkár Bíró (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria)
Siegfried Rainer (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria)
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Abstract

Purpose

The purpose of this paper is to analyse the surface vibrations of an induction machine due to force waves acting on the stator and rotor core. The focus lies on the investigation of the influence of force waves with axial variation and with higher spatial ordinal numbers on the surface vibration of an induction machine and thus its emitted noise.

Design/methodology/approach

Unit force waves with different spatial ordinal numbers and varying in axial direction are set up and applied on the stator and rotor teeth of a structural finite element model of an induction machine. Structural harmonic analyses with different frequencies are performed and the deformation of the machine is determined. After that, the root mean square of the normal component of the velocity on the surface of the machine's housing is determined and compared for the different force waves.

Findings

The influence of force waves with spatial ordinal numbers of higher order can have a significant influence on the structural vibration, especially if the spatial ordinal number is near the number of teeth. Furthermore, it is shown that the structure may react sensitively to axial variations of the forces, particularly near distinct structural resonances.

Originality/value

The presented investigations show relevant issues influencing the noise behaviour of electrical machines.

Keywords

Citation

Weilharter, B., Bíró, O. and Rainer, S. (2012), "Numerical investigation of the 3D vibrational behaviour of skewed induction machines due to rotating force waves", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 31 No. 5, pp. 1503-1512. https://doi.org/10.1108/03321641211248255

Publisher

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Emerald Group Publishing Limited

Copyright © 2012, Emerald Group Publishing Limited

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