Coupled electromagnetic-thermal-fluidic analysis of permanent magnet synchronous machines with a modified model

Abstract

The researches on the heat generation and dissipation of the permanent magnet synchronous machines (PMSMs) are integrated problems involving multidisciplinary studies of electromagnetism, thermomechanics, and computational fluid dynamics. The governing equations of the multi-physical problems are coupled and hard to be solved and illustrated. The high accuracy mathematical model in the algebraically integral conservative forms of the coupled fields is established and computed in this paper. And the equation coupling with the fluid flow and the temperature variation is modified to improve the positive definiteness and the symmetry of the global stiffness matrix. The computational burden is thus reduced by the model modification. A 20kW 4500rpm permanent magnet synchronous machine (PMSM) is taken as the prototype, and the calculation results are validated by experimental ones. Index Terms-Cell method (CM), model modification, multi-physics coupled problems, permanent magnet synchronous machine (PMSM).

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