Abstract
This paper undertakes an investigation into thermal modelling of Totally Enclosed Fan-Cooled (TEFC) motors used in traction applications. In the process, a 3D Computational Fluid Dynamics (CFD)-based Conjugate Heat Transfer (CHT) model is utilized, including the realistic stator geometry with cooling channels and considering the rotor rotation through the multiple reference frame approach. Extended air flow measurement data are used to determine the modelled air speed through the cooling channels and account for the impact of partial duct blockage. Loss distributions obtained via a transient electromagnetic Finite Element (FE) model are used in the process of heat source definition. Additionally, a simplified net radiation model is integrated in the boundary definitions along with natural convection. The main purpose of this paper is to highlight how different modelling approaches affect the obtained temperature distribution. The particular focus of this work is on the stator side and can be extended to various rotor structures. The methodology developed is applied for the thermal characterization of a prototype Interior Permanent Magnet (IPM) motor.
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