2021 Volume 45 Issue 4 Pages 106-111
This paper presents a model efficiently considering the anomalous loss as post-processing after the finite element analysis (FEA), and it is applied to the inverter excitation evaluation, especially the pulse-amplitude-modulation (PAM) inverter. The effectiveness of the designed FEA model is validated by non-oriented (NO) ring core experiments. The calculation result can express the iron loss obtained in experiments well. A new pulse pattern of the PAM excitation method is evaluated under two operating conditions. Under the first condition with the fixed maximum magnetic flux density Bmax considered as the conventional material evaluation, the iron loss with the PAM inverter excitation is smaller than that with the PWM inverter and sinusoidal excitations, and has the smallest value at the excitation angle of 165O in the PAM excitation. On the other hand, under the second condition with a fixed fundamental component value of the magnetic flux density Bf0, the iron loss becomes smaller in the order of the PWM, sinusoidal and PAM excitations, which heavily depends on magnitudes of the time harmonics of the flux density; the result obtained in this case has a different tendency with that in the first case where the Bmax is fixed.