Iron losses generated in a motor made of nonoriented electrical steel and driven by an inverter consisting of fast switching power semiconductor devices, GaN‐FETs were studied. The rectangular voltage pulses from the pulse width modulation applied to the motor generate not only a fundamental current but also harmonic currents. One of them increases considerably at the resonant frequency of the L, R, and C components in the motor. The phenomenon is called ringing. The ringing current, as well as the other currents, result in their respective iron losses. This study experimentally confirms that ringing occurs in the motor and quantitatively evaluates the iron loss related to it. The proportional dependence of the loss on the carrier frequency of PWM is found out.

中文翻译：

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快速开关GaN-FET逆变器供电的电机的铁损特性

研究了由非定向电工钢制成的电机产生的铁损，并由由快速开关功率半导体器件GaN-FET组成的逆变器驱动。来自施加于电动机的脉冲宽度调制的矩形电压脉冲不仅会产生基波电流，还会产生谐波电流。其中之一在L，R和C的谐振频率处显着增加电机中的组件。这种现象称为振铃。振铃电流以及其他电流会导致各自的铁损。这项研究通过实验确认了电动机中会发生振铃，并定量评估与之相关的铁损。找出损耗与PWM载波频率的比例关系。