An Improved Method for Induction Motor Constant Current Soft-Starting Using Fuzzy-Control

This paper proposes a Constant-current soft starting based on fuzzy control strategy. In this method, the fuzzy control rules are adjusted based on the changes of the starting current in time, which effectively eliminates current and torque oscillation compared with the traditional PID control soft starting. Checking full-voltage method is proposed based on simulation results of the relationship between voltage-drop of thyristor and rotate speed of motor. With the method, starting time is shortened, and harmonic of current and heat of thyristor are reduced. The software and hardware of the soft starting system are introduced. The experimental results show its validity.