三相交流调压电路在异步电机软起动中的应用

针对异步电动机全压起动时起动电流和起动转矩过大,易造成电机和负载损坏的缺点,将晶闸管三相交流调压电路引入电机软起动中。研究结果表明,其能显著改善起动电流和转矩过大的问题。文中阐述了晶闸管三相交流调压电路的工作原理;介绍了其在异步电动机软起动中的应用。此外,还研究了三相交流调压在电机软起动过程中,Matlab/Simulink的建模方法。给出了电机在软起动和全压起动的仿真结果,并对仿真结果进行了比较分析,相比全压起动,采用软起动可降低电机起动电流和起动转矩。

Application of Three-phase AC Regulating Voltage Circuit in Soft Start of Asynchronous Motor

The SCR three-phase AC adjusting voltage circuit is introduced into the soft starting of asynchronous motor to address the motor and load damages because of too large a starting current and starting torque for asynchronous motor with full voltage starting.The paper firstly describes the working principle of the SCR three-phase AC adjusting voltage circuit,and then introduces the application of the soft starting for asynchronous motor.The modeling method of three-phase AC voltage regulation in soft starting process based on Matlab/Simulink is studied in detail for asynchronous motor,and finally the paper gives the simulation results in the soft starting and full voltage starting,and the simulation results are compared and analyzed.The research results show that the problem of starting current and torque is improved significantly by using the soft starter compared with full voltage starting.