接触器的无传感器分合闸位移跟踪控制技术

A Sensorless Breaking and Closing Displacement Tracking Control Strategy of Contactors

为提高接触器的动作特性一致性,该文提出接触器无传感器的分合闸位移跟踪控制技术。首先,利用神经网络结合机械运动模型构建参数估计器,仅输入线圈电流即可实时估算全过程的电磁吸力、弹簧反力及动铁心位移。之后,在起动及分断过程中,采用基于模糊逻辑的位移外环控制吸力内环的双闭环结构,实现分合闸位移的实时精确跟踪;在保持过程中,仅采用吸力单闭环控制,通过设定合适的恒定吸力裕量使保持吸力始终大于反力,兼顾接触器的可靠保持和节能运行。通过仿真和实验验证方案的可行性,可知所提参数估计方法及闭环控制策略对电磁开关的高性能控制具有重要意义。

In this paper,a sensorless breaking and closing displacement tracking control strategy for a contactor is proposed,which improves the action consistency of the contactor.First,a parameter estimator is constructed by combining a neural network with a mechanical motion model,so the electromagnetic force,spring force and movable core displacement of the whole process can be estimated in real time only by the input coil current.Then,in the making and breaking process,the outer displacement loop controlling the inner electromagnetic force loop is adopted as a double closed-loop control based on a fuzzy algorithm,and the accurate breaking and closing displacement tracking of the movable core is realized.In the closing process,only electromagnetic force closed-loop control is adopted.The electromagnetic force is always greater than the spring force by setting an appropriate constant electromagnetic force margin.Therefore,the reliable holding and energy-saving of the contactor can be realized at the same time.The feasibility of the proposed scheme is verified by simulation and experiment.The parameter estimation method and closed-loop control strategy proposed in this paper are of great significance to high-performance control of electromagnetic switches.