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—In developing electric machines in general and induction motors in particular, temperature limits are a key factor affecting the efficiency of the overall design. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important and as a result of which computational methods are widely used for estimation of temperature rise in electrical machines. The paper develops a two-dimensional transient thermal model in rectangular co-ordinates accounting for losses and that describes the thermal phenomena in the rotor of an induction motor during reactor starting. The developed model has been implemented in FEM and has been applied to predict temperature rise in a 7.5 kW totally enclosed fan-cooled induction motor.

Computation of Temperature Distribution in the Rotor of an Induction Motor during Reactor Starting in Two Dimensional Rectangular Co-ordinates