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Thermal analysis is an important step in designing induction motors. Its principles require the calculation of induced currents in the rotors and obviously this phenomenon is connected to heating. Currents circulating in the stator coil also heats the machine. In this work, in order to evaluate the thermal behavior of the machine, a weak coupled modeling between electrical and thermal phenomena, is proposed taking into account the transient states. Also, in this work we introduce a new approach to take into account the airgap mne for thermal analysis. Experimental results are presented and compared with calculations.

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This paper presents measured data and electromagnetic FEM field calculations as techniques for detecting and analyzing eccentricity in three-phase induction motors. Also it presents experimental results for detecting broken bars in induction motor rotors. A search-coil is used as magnetic field sensor to measure the stray magnetic flux outside the motor. It is a totally non-invasive method.