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Advanced Materials Research Vols 562-564 (2012) pp 1931-1934 Online: 2012-08-30 © (2012) Trans Tech Publications, Switzerland doi:10.4028//AMR.562-564.1931 Design of Variable Frequency Speed Control System Base On PLC And Fuzzy Algorithm Ming-jun YAN1a Shao-feng YAN 1Liaoning Railway Vocational and Technological College, Jinzhou 121000,China 2 Faculty of Mechanical Engineering Automation, Liaoning University of Technology, Jinzhou, 121001, China; E-mail:yanshaofeng1963@163.com; Keyword: PLC; fu y algorithm; variable frequency speed control; closed loop control Abstract: Aiming at ac motor closed-loop control difficult, a frequency conversion system was designed base on PLC and fuzzy algorithm. This paper deals with a PLC and frequency converter controle AC induction motor method, as well as constructed two-dimensional fuzzy controller by PLC, realize the dynamic control of nonlinear systems, avoiding the complexity of modeling, improve the system stability and anti-jamming capability. On-site testing shows that this system has a high intelligence and better robustness, can frequency control of motor speed accurately. Introduction Ac induction motor is cheap, easy maintenance, and suitable for the bad environment in use.But it is difficult to define mathematical model of the ac motor, and the calculation is complicated.Combining with the variable frequency speed closed-loop control, the fuzzy control system based on PLC is put forward in the paper.The advantage is that just according to the control experience and by using fuzzy inference an satisfactory control effect to nonli