Modeling and Optimization of Film Capacitor for Motor Controllers Considering the Distribution of Internal Loss

The constrained operational temperature of film capacitors has become a critical impediment in the thermal management of motor controllers. However, existing methods for evaluating capacitor hot spot temperature do not account for the distribution of losses within the core, leading to substantial inaccuracies in the measured hot spot temperature. This paper proposes a method for assessing the hot spot temperature of film capacitor that considers the distribution of internal losses within the core and compares it with existing methods. Following this assessment, the capacitor core was subject to optimization, resulting in a 54.42% reduction in temperature rise.