针对起重设备专用三相异步电机的直接起动问题,分析了异步电机的T型等效电路,阐述了晶闸管调压电路的工作原理,提出了一种基于触发角定时控制的异步电机软起动方法。基于MATLAB/Simulink搭建了相应的系统仿真模型,进行了提出方法的仿真分析,验证了所提方法的正确性。最后,基于单片机设计了相应的软起动器的软硬件,进行了试验测试。结果表明提出的方法可以有效地实现三相异步电机的平滑起动,起动电流较小,有效地减少了起动过程对电机和电网的影响。

Aiming at the direct starting problem of three-phase asynchronous motor for hoisting equipment, the T type equivalent circuit of asynchronous motor was analyzed. The working principle of thyristor voltage regulating circuit was expounded. A soft start method of asynchronous motor based on trigger angle timing control was proposed. The corresponding system simulation model was built based on MATLAB/Simulink. Simulation analysis of the proposed method was carried out, and the correctness of the proposed method was verified. The software and hardware of the corresponding soft starter were designed based on single chip microcomputer. Test tests were carried out. The results show that the proposed method can effectively realize the smooth starting of three-phase asynchronous motor, and the starting current is small, which can effectively reduce the influence of starting process on the motor and the power grid.

TM 301.2

浙江省自然科学基金项目(LY18E070006, LY18E050016)；国家自然科学基金项目(51307151,51677172)；浙江省科技厅公益项目(2017C31042,2017C31036)