Affiliations: School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Correspondence:
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Corresponding author: Xiaoyuan Wang, School of Electrical Engineering and Automation, Tianjin University, No.92 weijin Road, Nankai District, Tianjin 300072, China. Tel.: +86 13672199875; E-mail:[email protected]
Abstract: Thermal analysis of Electric Machine for Electric
Vehicles (EVs), is crucial for precisely predicting the temperature
distribution. In the paper, for a forced-air cooled induction machine, two
methods of thermal models analysis are compared with measurements. The first
numerical method is Computational Fluid Dynamics (CFD) over Finite Element
Method (FEM). And the second one uses Lumped Parameter Method (LPM). For the
analysis based on CFD over FEM, a 3D induction machine is modeled with
force-air cooling housing. The air flow is simulated and the losses are
calculated as heat source for thermal models. FEM is coupled with CFD to get
the thermal field distribution. For the LPM, the equivalent thermal
resistance of winding, the heat transfer coefficients of the airgap and
forced air are calculated in the LP thermal model. Finally, Measurement
results are determined by PT100 embedded in winding end, as well by infrared
instrumentation for measuring the image on the shell thermal distribution.
Experimental validation is presented and the conclusion can be drawn from
comparing these aspects of two methods, providing some reference for the
research applied in motor for EVs.
