Abstract
ABSTRACT Determining the nominal thermal conditions of Induction Motors (IM) experimentally requires the appropriate equipment for loading the motor, expending the electrical energy and an enormous amount of time, The difficulties of these tests increase with the size of the motors and when it is necessary to perform the tests at the place of installation. This paper discusses the heating process of induction motors in a no–load test run under normal and over–voltage conditions. The method of prediction and recounting the results of a no–load test of IM on a full load run is proposed. The theoretical research of heat processes into IM is based on its thermal circuit and its electrical equivalent. Some of the parameters of the equivalent circuit were determined from the experiment. The influence of the technological uncertainties of manufacturing IM on their thermal parameters is also discussed.
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