Soft Start Control of Asynchronous Motors with Large Initial Resistance Moment
Asynchronous motors have the advantages of simple structure,high operating efficiency,small moment of inertia,fast dynamic response,and low maintenance workload,which can achieve energy-saving,improve product quality,and production efficiency.When an asynchronous motor is directly started in a stationary state,due to the absence of a back electromotive force,it will generate an impact current of 4-8 times the rated current,which not only affects the normal operation of other equipment working in the same power grid,but also causes irreversible damage to the motor itself and its driving equipment.Therefore,the start-up of large capacity asynchronous motors often adopts a voltage reduction soft start method.At the same time,large capacity asynchronous motors often have large initial resistance moments.If the initial triggering angle of the soft start system is not given reasonably,problems such as motor blockage and long start-up time may occur,which will affect the start-up task.This article proposes an estimation method for the short-circuit impedance and initial triggering angle of asynchronous motors in response to this phenomenon,which can effectively avoid the aforementioned problems.
万方数据
维普
