Modeling of Thermal Effects in Induction Machines due to the Stator End-Windings

The main purpose of this paper is to analyze and examine the thermal effects caused by the stator end-winding of an induction machine using the numerical computational fluid dynamics (CFD) modeling approach. The study was focused on the heat transfer phenomena between the end-winding and the cooling air inside the end-cap region of interest. Based in the CFD simulation results the heat transfer coefficients between the end-windings and the region of the cooling air and between the cooling air region and the end-cap were determined. The obtained results are validated with the results from the literature. The calculated heat transfer coefficients are important parameters for more accurate thermal analysis of induction machines using lumped-parameter thermal network.