The authors have proposed two methods for the iron loss evaluation of the filter inductor on a PWM inverter. The first is a loss map method based on a loss-map of the magnetic materials, which can calculate and presume iron loss without a real circuit. Another one is ILA(Inductor Loss Analyzer) method that can measure and calculate iron loss of every one-switching directly in an real circuit. But the former always applied it only single phase inverter. In this paper, the authors apply it for three phase inverter.