Evaluation of Iron Loss Distribution on Stator Surface of Induction Motors by means of Heat Measurement Method

Abstract

Purpose of this study is to clarify iron loss distribution on stator core surface of induction motors by using a heat-measurement method with a thermographic camera. This method has been applied to the surface mounted permanent magnet (PM) motors, which are removed stator windings, to measure temperature distributions on the stator surface during the PM rotor is rotating. Because the induction motors have no PM rotor, this method cannot apply directly and the exciting coils should be remained to generate rotating magnetic field. To overcome this difficulty, we firstly rotate the gage rotor at a certain low slip condition with an inverter driving motor and excited secondly the three phase stator windings. The heat radiation from a coil was corrected to obtain accurate iron loss distributions. In this paper, how to evaluate iron loss distribution on stator core surface of the induction motors is reported.