Research Of Intelligent Soft-starter Of Motor

The three phase asynchronous motor is most used in industry, agriculture, daily life and etc because of its simple structure, stable running, and lower price. With the quickly development of motors in production area, the more excellent start performance is desired. The traditional three-phase asynchronous motor starts when to the electrical network big electric current impact, cannot adapt the modern production development request. This article in view of existing three-phase asynchronous motor tradition starting question and so on under way flaw and synthesis intelligence protection and energy conservation, uses the reasonable control strategy and the intelligent control algorithm, developed one kind to insert take the high performance declines the processor as the core intelligence motor soft starters,. Mainly carries on below for this works:Applies nine controls theories to the electrical motor intelligence electrical motor soft starters controller. Nine-Point controller are divide into according to the deviation and the deviation rate of change the system running status 9 kind of operating modes, under the different operating mode uses the different control strategy. Because Nine-Point controller strategies are simple, does not have to establish is controlled the object the precise mathematical model. Selecting the 80C196 monolithic integrated circuit realization control algorithm.The intelligence motor soft starters partial hardware electric circuit has designed mainly includes the electric current, the voltage examination module, the crystal thyratron triggers and the pulse width enlargement electric circuit module, the numeral keyboard entry and the liquid crystal display output module. In the hardware circuit design comprehensively considered the present as well as the future will be possible to expand the function, has reserved the certain port.The intelligence soft starters software part mainly is calculates the voltage error and the error rate of change according to the sampling signal and the keyboard setting value, by Nine-Point controller algorithm control triggering angle size, thus achieves the control motor voltage slow rise the goal, thus enhanced the soft starters reliability, the stability and the accuracy. The system software design uses the modulation design concept, between the module the relative independence, is advantageous for the procedure compilation and the debugging. Selecting the monolithic integrated circuit C language to complete entire control software designed, including nine controls algorithms modularized program design, intelligent protection program module and so on program module, input output design.Thoroughly has studied Nine-Point controller parameters and the electrical motor starting time, the torque, the starting current between and so on the quota relations, to the time achieved the optimizing control performance, further enhances Nine-Point controller to start the process regulation performance and the stability in the asynchronous motor.