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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Influence of the fan cowl on the acoustic noise radiated from PWM controlled induction machines

Zhu, Z.Q. and Xu, L. and Howe, D. (2001) Influence of the fan cowl on the acoustic noise radiated from PWM controlled induction machines. In: IEMDC 2001: IEEE International Electric Machines and Drives Conference, 2001-06-17 - 2001-06-20.

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Abstract

The influence of the fan cowl, particularly the material of which it is made, on the acoustic noise emitted from PWM controlled induction machines is investigated. It is shown that there are significant harmonic excitation forces which can cause mechanical resonances of the fan cowl. The mechanical behaviour of both metal and plastic cowls is measured, using impulse force tests and random PWM excitation. The noise spectra and sound pressure level of a 1.5kW 3-phase induction machine when equipped with a metal and a plastic fan cowl are investigated, and the noise spectra when the machine is supplied from sub-harmonic PWM, space vector PWM and random PWM inverter are compared. It shows that a metal fan cowl can significantly amplify the noise level, whilst the noise level with a plastic fan cowl is effectively the same as that with the cowl removed.