| By researching the features of motor torque control and motor speed control in the AC frequency conversion adjustable-speed line of steel color coating, the paper analyze the construction of HanGang producing control system, present the methods of tension control system and construction of computer control system. Basing on modeling induction motor, the vector control improve motor's dynamic characteristics. By decomposing the motor stator's current, the induction motor have Instantaneous torque control characteristics as DC motor.Then the paper present the detail about tension control of steel coating line. By calculating no-load compensation current, weight compensation current, accumulator tension compensation current, dynamic torque compensation current, the total torque compensation current is gotten. In order to stable the tension of steel coating line, the paper present scheme of the loads balance of speed rollers and the adjustment to accumulator in order to synchronize the speed of different segment.By analyzing the model of induction motor and overhang line of steel belt in the heater, the paper apply simple fuzzy in control system. Basing on fuzzification, knowledge base, fuzzy reasoning and defuzzification, fuzzy controller of overhang line of steel belt is designed. Because of many faults in simple fuzzy controller, fuzzy controller with integration factor and fuzzy +PI dual mode controller is used and deeply studied. In the end of this thesis, a simulation study is made for overhang controller system of steel line, the simulation demonstrates the benefits of using fuzzy controller is restraining better speed-adjust performance, reduce the vibrating of steel belt.
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