State-space Model and Analysis of Motion-induced Eddy-current based on Distributed Current Source Method
State-space Model and Analysis of Motion-induced Eddy-current based on Distributed Current Source Method
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DOI：
10.1109/aim.2019.8868829
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Bingjie Hao;Xiaoshu Liu;Kok-Meng Lee;Kun Bai
中科院分区：
文献类型：
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作者：
Bingjie Hao;Xiaoshu Liu;Kok-Meng Lee;Kun Bai
本文提出了一种用分布电流源法模拟运动诱导涡流及其阻尼力的方法。所提出的方法，放松了两个常见的假设（可忽略的互感和小振动），离散成元素的导体振动电流密度源作为状态变量。运动诱导的涡流模型已制定在状态空间表示，并与有限元数值验证，结果显示出良好的一致性。该模型为研究互感和振幅对涡流及其产生的磁通密度和阻尼力的计算精度的影响提供了基础。研究结果表明，现有的方法（基于这些常见的假设）高估了峰值阻尼力，并未能捕捉高次谐波分量和频率对相移的影响。研究结果的PM的纵横比和导体集肤深度的阻尼力的影响的参数研究，EC阻尼系统控制应用的设计优化提供必要的依据。
This paper presents a distributed current source method to model the motion-induced eddy-current and its damping force. The proposed method, which relaxes two commonly made assumptions (negligible mutual induction and small vibration), discretizes the conductor into elemental vibrating current-density sources as state variables. The motion- induced eddy-current model has been formulated in state-space representation, and validated numerically with FEA; the results show excellent agreement. The model provides a basis to investigate the effects of mutual induction and vibration amplitude on the computation accuracy of the eddy-current and its generated magnetic flux density and damping force. The findings reveal existing methods (based on these commonly made assumptions) overestimating the peak damping force, and failing to capture high-order harmonic components and frequency effects on phase-shift. Results of a parametric study that investigates the effects of the PM aspect ratio and conductor skin-depth on the damping force are presented, providing essential bases for design optimization of EC damping system control applications.