An Optimal Closing Strategy of Low Speed With Large Force for Contactors
In order to better inhibit the bouncing of contactors in closing process,this paper presents a control strategy to optimize the closing process.First,the coil voltage and current are used as inputs to construct the parameter observer,so the dynamic electromagnetic force,spring force,movable core velocity and displacement of the contactor can be observed in real time.On this basis,a double closed-loop control structure is constructed.The outer-loop adopts fuzzy control to adjust the force margin before the over-travel iteratively.In the inner-loop,adding the force margin with the spring force in real time as the reference,the force closed-loop control is carried out to realize the iterative optimization of the closing speed in the outer-loop.Meanwhile,the observed displacement is compared with the opening distance of the contacts in real time.Once the movable core moves into the over-travel,the electromagnetic force increases rapidly by increasing the force reference,so it can realize the low speed with large force closing to suppress the rebound of the movable core.It can inhibit contact bounces furthest and meanwhile ensure the reliable closing.The feasibility of the control scheme is verified by simulation and experiment.It is of great significance for optimal control of the electromagnetic switch and the permanent magnet switch which are both operated by electromagnetic force.
contactorsparameters observationspeed closed-loopforce closed-loopoptimization control
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