基于无传感器的交流接触器位移控制策略

Displacement Control Strategy of AC Contactor Based on Sensorless Technology

针对传统接触器控制模型可靠性低、控制精度差等问题,提出一种基于无位置传感器的交流接触器吸合过程动态控制仿真分析方法。首先,根据交流接触器的磁路模型,推导出交流接触器动铁心的位移公式,形成位移估算器;在位移估算器的基础上进行吸力预测,并根据控制模型设计闭环控制器。其次,建立交流接触器的动态闭环控制仿真模型,通过对比分析交流接触器在非受控、脉冲宽度调制(PWM)分时控制和位移闭环控制3种模式下的闭合时间,证实位移闭环控制方案的有效性。最终,实验结果证实所提模型的精确度以及控制策略的实用性,为交流接触器的智能控制提供思路。

Aiming at the problems of low reliability and poor precision of traditional contactor control model,a dynamic simulation and analysis method of AC contactor suction process based on sensorless technology is proposed.Firstly,according to the magnetic circuit model of AC contactor,the displacement formula of moving iron core of AC contactor is deduced,and the displacement estimator is formed.Based on the displacement estimator,the suction force is predicted,and a closed-loop controller is designed according to the control model.Then,the dynamic closed-loop control simulation model of AC contactor is established,and the closing time of AC contactor in three modes of uncontrolled,PWM time-sharing control and displacement feedback closed-loop control is compared and analyzed,which proves that the displacement closed-loop control scheme has remarkable effectiveness.Finally,the experimental results confirm the accuracy of the model and the practicability of the control strategy,and provide some ideas for the intelligent control of AC contactor.