Low-order thermal models of electrical machines are fundamental for the design and management of electric powertrains since they allow evaluation of multiple drive cycles in a very short simulation time and implementation of model-based control schemes. A common technique to obtain these models involves homogenization of the electrical winding geometry and thermal properties. However, incorrect estimation of homogenized parameters has a significant impact on the accuracy of the model. Since the experimental estimation of these parameters is both costly and time-consuming, authors usually prefer to rely either on simple analytical formulae or complex numerical calculations. In this paper, we derive a low-order homogenized model using the method of multiple-scales (MS) and show that this gives an accurate steady-state and transient prediction of hot-spot temperature within the windings. The accuracy of the proposed method is shown by comparing the results with both high-order numerical simulations and experimental measurements from the literature.
Thermal Homogenization of Electrical Machine Windings Applying the Multiple-Scales Method
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 8, 2016; final manuscript received July 22, 2016; published online August 30, 2016. Assoc. Editor: Gongnan Xie.
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Romanazzi, P., Bruna, M., and Howey, D. A. (August 30, 2016). "Thermal Homogenization of Electrical Machine Windings Applying the Multiple-Scales Method." ASME. J. Heat Transfer. January 2017; 139(1): 012101. https://doi.org/10.1115/1.4034337
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