Thermal model for a switched reluctance motor of TEFC design during steady and transient operation

A lumped-parameter approach is adapted for the prediction of the steady-state and transient thermal behaviour of a prototype multiple teeth per stator pole switched reluctance motor (SRM), of TEFC (Totally Enclosed fan-cooled) design as an illustrative example. The merit of the method has been demonstrated by its application to the induction motor and experimental verification. The SRM is subdivided into simple geometries and the equivalent circuits and the proper connection of these equivalent circuits are presented. The combination of these circuits forms the full model which is used for prediction of the temperature rise of different parts of the motor.