Fuzzy-PID double mode control of ultra-precision AC servo syst em
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摘要: 交流位置伺服系统因其存在参数时变、负载扰动以及电机的非线性等缺点 ,很难为其建立准确的模型.模糊(fuzzy)控制具有无需建立被控对象的数学模型、鲁棒 性好等优点,但稳态精度差.将模糊控制和PID控制相结合,设计了Fuzzy-PID双模控制器. 在论域内用不同的控制方式分段实现控制,这样就综合了模糊控制和PID控制的优点,克服 了各自的缺点.该控制器结构简单、易于实现.在半闭环交流位置伺服系统上所做的实验表 明,采用Fuzzy-PID双模控制器与采用经典PID控制器相比,阶跃响应的调整时间减少了33.7% ,并且无超调,轨迹跟踪误差减小了47.2%.Abstract: It is difficult to establish mathematical mode for AC servo system , because it has several disadvantages, such as parameters varying as time, load disturbing, motor being non-linear, and so on. Fuzzy control need not establis h the mathematical mode of controlled plant, but steady state precision is bad. A fuzzy-PID double mode controller was presented, which combined fuzzy controlle r and PID controller. Different controller was adopted in different domain, so th e double mode controller combined the advantages of fuzzy controller and PID con t roller, and get rid of the disadvantages of them. The double mode controller is easy to realize. Experiment results show that the fuzzy-PID double mode controller reduces settling time by 33.7% without overshooting and decreases tra cking error by 47.2% in comparison to standard PID controller.
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Key words:
- fuzzy control /
- PID control /
- double mode control /
- AC se rvo system
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