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Keywords: asynchronous motor, variable load, energy-saving, simulation Abstract. In order to achieve the goals that asynchronous motor operates energy -savingly and economically by lowering the operating voltage when the light load or no-load running, this paper starts from the T simplified model of asynchronous motor, and analyzes the energy consumption in detail, then uses the basic principle of regulating technology from two-way thyristor to save energy, at last, it gets key factors affecting the stability of output voltage, that is power factor Angle fluctuations. Through the simulation and analysis of the energy-saving control system for asynchronous motor, it proves that when making soft start control to asynchronous motor and the trigger angle of thyristor starting in slope way. So the starting performance of the system are improves greatly. At the same time, the introduction of power factor angle to fuzzy self-tuning PID closed-loop control, the stability and reliability of the whole regulation process have improved significantly asynchronous motor operates energy -savingly and economically when the light load or no-load running.

The research on soft start and buck energy-saving simulation of asynchronous motor