快速机械开关合闸振动与形变特性研究OA

The electromagnetic driving force of fast mechanical switches during the closing process is relatively small compared to that during the opening process,making it more susceptible to external disturbances.The long-term operation in this condition may lead to degradation or even failure of closing performance.However,the stud-ies on the closing characteristics at present are still limited.In this paper,an in-depth experimental study is carried out on a prototype of a fast mechanical switch,investigating its closing characteristics under long-term operation from perspectives of vibration and deformation.First,a closing characteristic experimental platform is established to acquire motion,vibration,and deformation data of the switch under long-term operation.Then,the influence of ca-pacitive voltage and friction coefficient on the closing operation is studied.The result shows that a slight decrease in the closing apactive voltage can significantly reduce the average closing speed.When the voltage drops by approxi-mately 3%,the speed decreases by about 23%.Then,time-frequency analysis of the closing vibration signals is con-ducted.It is found that the vibration signals on the plane of the opening/closing coils are the most prominent,with the impulse energy primarily concentrated within the 0～5 kHz,and partcularly stronger in the 0～2 kHz range.Fur-thermore,both the reduction of closing capacitive voltage and the increase of friction resistance tend to diminish the spectral peak values of the vibration signals.Finally,the deformation data is analyzed in combination with stress simulation.The result shows the deformation of the link in the holding mechanism gredually increase with the num-ber of switching operations.The degree and rate of deformation on the left side are both greater than on the right side,while the link of the actuating mechanism does not exhibit significant deformation.