Multiple expansion points are introduced to the multiport Cauer ladder network method to realize an efficient model order reduction of an eddy-current field. The proposed method can set multiple target frequencies to cover a wide frequency range with a small number of multiport electric network elements. A time-dependent response to pulsewidth-modulation (PWM) excitation is accurately reconstructed by setting the target frequencies at both fundamental and carrier frequencies.

中文翻译：

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具有多个扩展点的多端口模型降阶

将多个扩展点引入到多端口Cauer梯形网络方法中，以实现涡流场的有效模型阶数减少。所提出的方法可以设置多个目标频率，以利用少量的多端口电网元件来覆盖较宽的频率范围。通过将目标频率设置为基本频率和载波频率，可以准确地重建对脉冲宽度调制（PWM）激励的时间相关响应。