Study of Thermal Field Analysis Methods of Oil-Filled Motors

Thermal analysis is essential for the design of permanent magnet synchronous motors. The influence of fluids needs to be taken into account for the analysis of thermal field of oil-filled motors. The flow of fluid in the motor can cause an increase in loss and also improve the internal thermal conductivity. If the influence of fluid on the thermal field of the motor cannot be fully considered, the calculation results of thermal analysis will be inaccurate. The thermal field of an oil-filled motor can be calculated by the computational fluid dynamics (CFD) method, but its drawbacks of complex modelling and long computation time lead to inefficiency in motor design. This paper proposes a computational fluid dynamics and finite element method (CFD-FEM) conjoint calculation method to calculate the temperature rise of an oil-filled motors. The method can significantly reduce the calculation workload with the accuracy of the calculation.