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Lamination core losses in motors with nonsinusoidal excitation with particular reference to PWM and SRM excitation waveforms

机译：非正弦励磁电机的叠片铁损，特别参考PWM和SRM励磁波形

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摘要

The effects of varying the modulation index and the switching frequency on steel lamination core losses when excited with pulse width modulated waveforms are first investigated. A switched reluctance motor flux model is also developed and flux waveforms for different parts of the machine are synthesized. Using these flux waveforms, the paper presents the loss trend inside a switched reluctance machine, showing the core loss variation of the machine. The rotor was found to incur higher losses than any other part inside the switched reluctance motor. The paper further identifies the flux density harmonics that contribute to higher core losses in the rotor. Using the Fourier series, an attempt to predict core losses under switched reluctance motor flux density waveforms is done and the predicted results are compared with measurements. An Epstein frame was used for direct core loss measurements on 0.0140 in. [0.36 mm] commercial electrical steel; the methods and test bench used, along with test results are detailed in the paper.ud
机译：首先研究了当用脉冲宽度调制波形激励时，改变调制指数和开关频率对钢叠片铁心损耗的影响。还开发了开关磁阻电动机磁通模型，并合成了机器不同部分的磁通波形。利用这些磁通波形，本文介绍了开关磁阻电机内部的损耗趋势，并显示了电机的磁芯损耗变化。发现转子比开关磁阻电机内部的任何其他部分产生更高的损耗。本文进一步确定了导致转子铁心损耗更高的磁通密度谐波。使用傅里叶级数，尝试预测开关磁阻电机磁通密度波形下的铁损，并将预测结果与测量结果进行比较。 Epstein框架用于在0.0140英寸[0.36 mm]商用电工钢上直接测量铁损。本文详细介绍了所使用的方法和测试台以及测试结果。 ud

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