The Study of Asynchronous Motors Behavior in Artificial Load
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2013, Vol 37, Issue 37
Abstract
The performances and heating of asynchronous motor are established to nominal load into a testing laboratory. Only in this way can be created real life working conditions, but there are also two big disadvantages: the need of applying a mechanical load to the shaft and the big energy consumption. Heating testing using this method is expensive and long lasting. That is why Ytterberg proposes a new method of heating test, the method of two frequencies, a synthetic form of charging. In this case, the asynchronous motor that is tested is not mechanically coupled, is powered from a network composed by a two different source of voltage and frequency which are electrically in series. Starting from machine parameters, trough numerical calculations, in the paper is established the correlation of frequency and voltage of the two sources to obtain current and the same losses as the nominal regime when the motors operates without load. The speed of asynchronous machine oscillates around the synchronism speed, the power is changing very often the sign because and as result also the functioning regime as motor or alternator. Trough this periodical change it creates the artificial load. Particular simulation cases are showing the internal behavior, electrical and magnetic loads to which the machine is submitted. All this reasons justified very well by simulations, are showing that we are in presence of an important distortion regime.
Authors and Affiliations
, Ion Vlad, Aurel Campeanu, Sorin Enache, Mihaela Tita
Keywords
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