Thermal Analysis of a Hybride Excitation Flux-Switching Motor with Water-Cooling System

In this paper, to verify the heat dissipation reliability of a new hybrid excitation flux-switching (HEFS) motor, finite element is used to develop a thermal simulation method of electromagnetic-fluid-thermal coupling. First, general methods of motor temperature analysis and topology of new HEFS motor are introduced. Then, based on motor efficiency map, the maximum loss working status of HEFS motor is analysed to calculate the motor loss, which mainly includes copper loss, iron loss and eddy current loss of permanent magnet. Meanwhile, airflow field and water flow field are analysed respectively to calculate the convective heat transfer coefficient of water-cooling motor. With motor loss and convective heat transfer coefficient, the temperature of motor components at rated condition, maximum loss and maximum effciency are checked to ensure the safety of motor operation, which is also significant to further improve motor performance.