An Iterative Calculation Method for the Loss and Temperature of an Air-cooled Driver of a Permanent Magnet Motor

The loss and temperature calculation of power semiconductor device as the core component of motor driver is one of the most crucial issues. An iterative calculation method for the loss and temperature of an air-cooled driver is presented in this paper. The calculation method is coupled with the analytical model of temperature-dependent power semiconductor device loss, the radiator ventilation network model and the 3-D fluid and heat transfer numerical model of the driver. The influence of temperature on the output characteristics and loss of the power device are taken into account in the method. Based on the method, the loss and temperature distribution of each chip of the power device are calculated and verified by testing.