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精密直驱龙门系统的交叉耦合互补滑模控制

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Keywords: 双直线电动机伺服系统,交叉耦合控制,互补滑模控制,同步控制

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Abstract:

针对龙门定位平台上双直线电动机伺服系统的位置精确同步控制问题,提出一种基于交叉耦合控制(Cross-CoupledControl,CCC)与互补滑模控制(ComplementarySlidingModeControl,CSMC)相结合的控制方案。考虑到永磁直线同步电动机(PermanentMagnetLinearSynchronousMotor,PMLSM)易受系统存在的端部效应、参数变化、外部扰动及非线性摩擦等不确定性因素的影响,建立含有不确定性因素的直线伺服系统的动态模型。为了使系统实现高精度强鲁棒性的位置跟踪性能,设计基于CCC和CSMC的双直线电动机伺服系统。利用CSMC对系统不确定性因素不敏感和抖振小的优点,来保证双直线电动机伺服系统中单轴的位置跟踪精度;并将CCC引入到双直线电动机伺服系统中,消除了双电动机之间存在的耦合,进而减小了系统的位置同步误差。系统实验结果表明,该控制方法具有快速的跟踪性和较强的鲁棒性,能够满足高精度强鲁棒性的实际加工生产需求。

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