Introduction of Power Module for Brushed and Brushless Exciter System of Electrically Excited Synchronous Motor

This paper introduces the APM (Automotive Power Module) series for the Brushless Exciter of EESM (Electrically Excited Synchronous Motor) 1200V motor driver application. EESM is a new EV (electric vehicle) motor solution with higher efficiency compared to the Asynchronous Motor (ASM) due to fieldweakening operation. Additionally, EESM does not require permanent magnets (which are made of rare earth materials), making it more environmentally friendly and cost-effective compared to permanent magnet synchronous motors (PMSM). In this paper, the operation of brushed and brushless exciter systems will be explained and compare the power loss of the two exciter systems through simulation. Additionally, it will introduce the solution developed by ONSEMI, which can be applied to both exciter systems.