The Design And Research Of Three-Phase Independently-Controlling Intelligent AC Contactor With Controllable Electromagnetic Counter-Force

The AC contactor is developing rapidly in the direction of energy saving,high efficiency.reliability and long service life with the introduction of microprocessor technology,microelectronics technology,control technology and communication technology,etc.Intellectualizing has become a hot spot in the field of AC contactor research at present.The electrical performance and electrical life of an AC contactor have an important influence on the stability of the entire industrial automation system due to its frequent switching operations.The huge demand for AC contactors has further put forward higher demands on their economic indicators as well.In this paper,based on the principle of zero current breaking of three-phase circuit,a design scheme,three-phase independently-controlling intelligent AC contactor with controllable electromagnetic counter-force is presented for facilitating the extinguishment of the contact arc and reducing the damage caused by the arc to the AC contactor.The traditional AC contactor is disconnected by spring force,strengthening the stiffness of spring to increase the breaking speed would have a negative impact on the closing process at once.This paper introduces a new design concept that give the electromagnetic system of the contactor controllable electromagnetic counter-force by reforming it into double-coil structure in order to speed up the breaking process without affecting the closing speed.At the same time,the design of three-phase independently-controlling combined intelligent AC contactor can provide great convenience for the control of three-phase zero current breaking.In this paper,the basic structure,function and design basis of the combined intelligent AC contactor are introduced in detail and the 3D solid model is drawn intelligently with the help of SOLIDWORKS Secondary Development Based on VB.Then,the 3D model of the electromagnetic system is imported into ANSYS softwarefor electromagnetic simulation analysis to verify the correctness of the design of the double-coil electromagnetic drive system.What's more,the experiment of testing the control of breaking arc of AC circuit is carried out by regarding the intelligent AC contactor with double coils as carrier to analyze the feasibility of zero current break control principle of AC circuit.Attraction performance is an important performance index of AC contactor.In this paper,the mixed programming of VB.NET,ANSYS,MATLAB and Access database is used to develop an electromagnetic simulation system of the twin-e AC contactor.Then,this system is used to analyze the attraction performance of AC contactors under different parameters of electromagnetic system for optimizing the structure of the electromagnetic system with the minimum core sizc and the maximum suction,greatly improves the economic performance of the intelligent AC contactor with double coil.Application of the Monocular Vision Technology-based spatial dynamic process testing platform of intelligent appliance and the intelligent control system for asynchronous combined AC contactor which are independently developed by our Intelligent Electrical Laboratory for the three-dimensional dynamic test of the three-phase intelligent AC contactor composed of double-coil AC contactors during phase selection closing process and zero current breaking process,analyzing its motion characteristics so that provide the data foundation for the further study of the virtual prototype design of the double-coil AC contactor.