A Dynamic Multilayer Winding Thermal Model for Electrical Machines With Concentrated Windings

Abstract

This paper presents a dynamic multilayer winding lumped-parameter thermal model dedicated to electrical machines with concentrated windings. The winding is layered into a series of circular rings by a novel layer strategy according to the winding temperature distribution obtained by a two-dimensional analytical slot winding thermal model. Accordingly, the layer number can be automatically and dynamically adjusted so as to accurately model the winding temperature distribution using the smallest layer number. Besides, the end-winding is also layered similarly to the slot-winding based on the thermal behavior of the nonoverlapping concentrated windings. The proposed winding model could accurately calculate the temperature distribution within the slot, including the winding maximum and average temperature. Experiments on a winding motorette and a water-cooled permanent magnet machines with concentrated winding intended for electric vehicles have been implemented to validate the proposed winding thermal model.