A finite element approach to harmonic core loss prediction in VSI-fed induction motor drives

When an induction motor is supplied by a PWM voltage source inverter (VSI), flux pulsations due to voltage harmonics cause extra power dissipation for hysteresis and eddy-currents in the magnetic core. Based on the expected inverter output voltage spectrum, a finite element analysis method is discussed in this paper to predict supply-related additional core losses. The finite element motor model is tuned based on available ring-test data. Calculation results are compared to the measurements collected during a real motor drive testing.