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Investigation of the dynamic electromechanical coupling due to the thrust harmonics in the linear motor feed system

机译：直线电机进给系统中由推力谐波引起的动态机电耦合的研究

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In the linear motor feed system, all the intermediate transmission components are cancelled. Lots of thrust harmonics caused by the nonlinearity of drive circuit and motor itself directly act on the mechanical system, leading to the vibrations. Meanwhile, the mechanical vibrations also affect the characteristics of motor thrust through the full closed-loop control. There is a close coupling between the servo drive and mechanical system, affecting the dynamic precision of the feed system. Therefore in this paper, an analytical method, which is used to present the mechanism of the electromechanical coupling caused by the thrust harmonics and its effects on the dynamic precision, is explored for the linear motor feed system. The thrust harmonics and mechanical characteristics are calculated firstly. The interactions between the servo system and mechanical system are analyzed afterwards. Then the coupled equation is established and the coupled process is analyzed. Moreover, the influence of the coupling on the displacement fluctuation is discussed. The results show that the thrust harmonics will produce significant displacement fluctuations, which is actually an electromechanical coupling process. In addition, its effects will aggravate with the increase of the velocity. At last several measures are put forward to improve the dynamic precision of the feed system. The displacement fluctuation caused by thrust harmonics is decreased more than 90% by implementing an integrated compensation strategy. This work will provide the theoretical support for the analysis and optimization of the complex electromechanical couplings, especially for the linear motor feed system.
机译：在直线电机进给系统中，所有中间传动部件均被取消。由驱动电路和电动机本身的非线性引起的大量推力谐波直接作用于机械系统，从而导致振动。同时，机械振动也会通过全闭环控制影响电动机推力的特性。伺服驱动器和机械系统之间存在紧密耦合，从而影响进给系统的动态精度。因此，本文探讨了一种解析方法，用于介绍由推力谐波引起的机电耦合机理及其对动态精度的影响，该方法适用于直线电机进给系统。首先计算推力谐波和机械特性。随后分析伺服系统和机械系统之间的相互作用。然后建立耦合方程并分析耦合过程。此外，还讨论了耦合对位移波动的影响。结果表明，推力谐波将产生明显的位移波动，这实际上是一个机电耦合过程。另外，其效果将随着速度的增加而加剧。最后提出了几种提高进料系统动态精度的措施。通过实施集成补偿策略，由推力谐波引起的位移波动可减少90％以上。这项工作将为复杂的机电联轴器的分析和优化提供理论支持，尤其是对于线性电动机进给系统。

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