Abstract
In this paper, a simplified 3-dimensional (3-D) hybrid analytical thermal model is proposed to investigate the influence of axial and circumferential PM segmentations on the spatial PM temperature distributions and corresponding hotspots for surface-mounted PM synchronous machines (SPMSMs). The developed 3-D model synergizes the lumped-parameter thermal model and the analytical method, taking into account the uneven PM eddy current loss distributions and capable of predicting spatial PM temperature distributions and hot spots. Meanwhile, by utilizing the dimensionality reduction and linearization methods, the proposed simplified analytical model has a simple mathematical expression, and consequently, the modelling process and computation burden can also be eased. The proposed simplified hybrid analytical thermal model is applied to a SPMSM and validated by the 3-D coupled electromagnetic-thermal FEA and experiments.
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