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New method for experimental modal analysis of hydrogenerator's stator core using the excitation from the Poles
Author(s) -
Barros Allan,
D'Agostini Alexandre,
Penteado Thierre Zulzke,
Kato Norio,
Cunha André Alves,
Faria Egidio José,
Haluska Carlos,
Hamaji Fernando Hiroyuki,
Nabeta Silvio Ikuyo,
Chabu Ivan Eduardo
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8225
Subject(s) - stator , modal analysis , modal , vibration , impulse (physics) , hammer , acoustics , core (optical fiber) , excitation , normal mode , computer science , structural engineering , mechanical engineering , physics , engineering , electrical engineering , materials science , classical mechanics , telecommunications , polymer chemistry
The study of stator core vibrations generated by electromagnetic forces in electrical machines is of great practical and theoretical interest. An important part of the problem is the correct determination of mode shapes and eigen frequencies of the mechanical system. This work brings to discussion a new experimental modal analysis (EMA) method developed for synchronous machines in which the traditional instrumented hammer impulse is substituted by a magnetic pulse generated by currents applied in two poles. Experimental results obtained in a real 190 MVA hydrogenerator are shown.

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