Energy-Based Closing Control Towards Contact De-bounce

Abstract:- This paper describes the dynamic analysis of contactor system. An ac contactor is modeled and studied focusing on the problem of energy-dissipated efficiency and contact bounce during closing phase. The performance of contact bounce is characterized in terms of a set of variables, the velocity and position of movable part. Afterwards, three cost functions related to the energy dissipation of device are proposed, energy dissipation of coil resistance, energy dissipation of coil inductance, and the kinetic energy of the movable part. The aim is to understand the influence of the applied coil voltage for different initial voltage phases on the contact bounce. The best closing angle for an ac contactor is determined by comparing the kinetic energy needed for moving the movable part in each closing angle. Since the collision velocity or the moving kinetic energy of contact is decreased significantly, hence the electric life and the mechanical life of contactor can then be prolonged and the operating reliability is improved. The validation of the performance of the measurements was performed by means of simulation and experiment approach. Finally, there are some useful and valuable results are obtained and presented too