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标题：基于双幂次滑模趋近律方法的PMLSM精密位置控制 |
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作者：张博，齐蓉 |
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| 2016年第12期 访问次数：322次 |
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摘要：针对永磁直线同步电机的位置伺服控制系统高精度、强鲁棒的要求，提出了基于双幂次滑模趋近律的滑模控制策略。双幂次滑模趋近律具有全局有限时间收敛特性，且能够弥补传统滑模趋近率方法存在的收敛速度慢、抖振严重的不足。同时，为了降低控制方法的保守性，设计了一种改进的基于超螺旋算法的滑模扰动观测器，可实现对控制系统未知扰动的自适应估计，即在传统超螺旋算法中增加一个幂指数，增加指数值可提高对未知扰动的估计的收敛速度，并通过仿真实验验证了所提出的扰动观测器的正确性。最后，搭建了用于测试永磁直线同步电机激光切割的实验台对所提出的控制器进行，实验结果验证了所提出的控制策略的有效性。
关键词：永磁直线同步电机；双幂次滑模趋近律；滑模扰动观测器
Abstract: The control strategy based on double power sliding mode reaching law was proposed in this paper, it was designed for requirements of high precise, strong robust on the PMLSM position servo control. Double power sliding mode reaching law has a property of global finite time convergence, which can make up the shortfalls of slow speed of convergence, serious chattering of the conventional sliding mode reaching law control methods. Meanwhile, in order to reduce conservative property of the control method, a modified sliding mode observer based on SuperTwisting Algorithm (STA) was designed，which can fulfil the adaptive estimation of unknown disturbance on the control system. ie, adding a power exponent in conventional STA. Increasing the exponent value can improve the speed of convergence of the unknown disturbance estimation, and the validity was proved by the results of simulation experiments. Finally, a laser cutting translation test stages based on PMLSM was built, and the results show that the proposed method in this paper is effective.
Key words: permanent magnet synchronous linear motor; double power reaching law; sliding mode observer |
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