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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, Cambridge.

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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.

Item type: Conference or Workshop Item (Paper)
ID code: 37659
Keywords: influence, fan cowl, acoustic noise, radiated , pwm controlled, induction machines, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 14 Feb 2012 16:07
    Last modified: 04 Oct 2012 17:22
    URI: http://strathprints.strath.ac.uk/id/eprint/37659

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