Iron Loss and Hysteretic Properties under PWM Inverter Excitation at High Ambient Temperatures Atsushi Yao, Shunya Odawara, Keisuke Fujisaki IEEJ Journal of Industry Applications-JAPAN 2018

Abstract 

We experimentally and numerically investigate the magnetic properties of magnetic materials excited by sinusoidal and pulse width modulation (PWM) inverter input at high ambient and room temperatures. We show that the iron losses under sinusoidal and PWM inverter excitations decrease with an increase in temperature. It is found that the temperature dependency of iron loss properties is related not only to major loop but also to minor loops. Furthermore, we derive the numerical expression for the hysteretic properties of the PWM inverter- and sinusoidal-fed ring tests at room temperature and 300°C by using the play model with the Cauer circuit.

LINK
https://www.jstage.jst.go.jp/article/ieejjia/7/4/7_298/_pdf/-char/en