A variable frequency drive uses a varying frequency and voltage signal to control the speed and torque of a motor. It promises an excellent control performance and energy savings up to 20% when compared to traditional driving techniques. However the fast switching of high currents is well known to create EMC issues and leads to the need of filtering the switching circuit.
In this eSeminar, we show how the EMC performance of a control system for an automotive motor can be simulated. For this task we have coupled a full-wave 3D analysis to a switching circuit. The simulation results are directly compared to measurements of prototypes and show an excellent agreement.