龙门加工中心移动横梁悬浮刚度控制的研究.pdfVIP

新技术应用 ·1923 · 龙门加工中心移动横梁悬浮刚度控制的研究 杨 霞 高 燕 郭庆鼎 沈阳工业大学电气工程学院 辽宁 沈阳 110178 【摘 要】 大型龙门加工中心磁悬浮横梁刚度的要求不 同于磁悬浮列车及其他磁悬浮装置的要求， 针对其特点提出了可以显著降低悬浮磁铁 功耗的电磁永磁混合悬浮技术。为了解决电磁 铁线圈中的电流变化对总体刚度的影响，采用双 闭环控制系统，即在位置环内引入电流 环，构成位置电流双闭环系统。根据机床加工过程的特点以及模糊规则等控制器参数选 定的繁琐性，设计出符合机床悬浮横梁要求的遗传算法模糊 PID 控制器。仿真结果表 明，将遗传算法引入模糊 PID 控制器中可以提高悬浮系统的刚度，满足了机床磁悬浮横 梁系统的精度要求；同时遗传算法的优化效果十分显著，使得模糊 PID 控制器各项参数 的确定更具有综合性和科学性。 【关键词】 磁悬浮移动横梁；模糊 PID ；遗传算法；MATLAB Research on the Control of the Suspension Stiffness for the Beams in Yang Xia Gao Yan Guo Qingding Electric Engineering college of Shenyang University of Technology ，Shenyang 110178 ，Liaoning ，China Abstract ：The requirement of the stiffness of the magnetic suspension beams in Large Gantry Machining Center is different from that of the magnetic suspension trains and other magnetic suspension devices. According to its characteristics ，a kind of suspension technology ，which combines the permanent magnet and the electromagnetism together ，is presented and could obviously reduce power consumption. In order to solve the impact of the change of current in magnet coils on the overall stiffness ，a double closed loop control system ，which introduces a current loop into the position loop for forming a position and current double closed loop control system ，is adopted. According to the process characteristics of the machine tool and the choice of parameters in the controller as the fuzzy control rules ，a genetic algorithm （GA ） fuzzy PID controller to meet the requirement of suspended bea