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Localised surface vibration and acoustic noise emitted from laboratory scale transformer cores assembled from grain-oriented electrical steel

Moses, Anthony John, Anderson, Philip Ian and Phophongviwat, Teeraphon 2016. Localised surface vibration and acoustic noise emitted from laboratory scale transformer cores assembled from grain-oriented electrical steel. IEEE Transactions on Magnetics 52 (10) , 7100615. 10.1109/TMAG.2016.2584004

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Abstract

Magnetostriction of grain-oriented 3% Si Fe sheets was measured prior to assembly into model transformer cores. Core vibration was measured using a laser scanning vibrometer and harmonic spectra of acoustic noise were evaluated from the microphone outputs. Explanations show why no correlation exists between vibration harmonics profiles and A-weighted acoustic noise spectra. High localised vibration did not cause high noise due to phase differences in surface vibrations and it is shown that this is the main reason why the A-weighted noise of a three phase core can be less than that of an equivalent single phase core. Noise from cores assembled from low magnetostriction materials was not always lowest because of the variable effect of electromagnetic forces.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: IEEE
ISSN: 0018-9464
Date of First Compliant Deposit: 15 July 2016
Date of Acceptance: 6 June 2016
Last Modified: 29 Jun 2019 04:31
URI: http://orca.cf.ac.uk/id/eprint/92531

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