Research On The Intelligent Controller Of Soft Starter For Motor Based On MCU

Intelligent Solid Soft Starter is designed for large and medium electromotor in order to decline the maximum current during the starting.Through controlling the current,It can avoid the impact for electric net other equipments and motor, improving the efficiency of net and decreasing impair of motor.All of these can start the motor and protect the equipments.Firstly,On the base of reference,analyze and generalize the existent technology of solid soft starter.Secondly,through analyzing the motor characteristics of starting, contrasting several traditional modes of soft.starter and combining with actual apply. In the end,the system design of solid soft starter based on variable reactance technique is selected.In this thesis,hardware circuit based on the LPC932A1 MCU,including the system of microprocessor,the input/output channels of analog and switch signals, LCD man-machine Interface,memory,RS485 communication and the DC power, every part of the circuit is analyzed in detail.The software of the controller is discussed;Through analyzing both fuzzy control and PID,taking advantages of the characteristics of fuzzy and PID,the mixture of fuzzy control and PID are applied in the controlling strategy of starting electromotor.The model of the soft start system is set up and simulated by Matlab/Simulink, the feasibility of the controller is proved by the simulation results.At last,the system's experimentation is illuminated and experimental results are presented.The experiments indicate that the Intelligent Solid Soft Starter can decrease remarkably the starting current of the motor;The current can be restricted about three times rating current compared with the direct starting current and reaches the requests of the soft start of asynchronous motor.