›› 2012, Vol. 25 ›› Issue (5): 66-.

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Simplified Analysis and Simulation of Soft Starter in Turn-off Angle Controlled Type

 WANG Ling   

  1. (Department of Computer Science,Shaanxi Vocational and Technical College,Xi'an 710100,China)
  • Online:2012-05-15 Published:2012-05-24

Abstract:

For the three-phase ac regulation voltage circuit of soft starter with turn-off angle controlled type using thyristor,the circuit is equivalent to a reactance which changed with turn-off angle.In combination with asynchronous motor's simplified equivalent circuit model,an equivalent circuit of the soft-start main circuit is obtained.On this basis,this paper analyzes the relation between turn-off angle,stator current,electromagnetic torque,maximum electromagnetic torque,and critical slip ratio,with the conclusion that turn-off angle could effectively control starting current of the motor.The simulation results show that theoretical analysis is effective and feasible.

Key words: turn-off angle control;thyristor;soft starter;equivalent circuit

CLC Number: 

  • TM573