Vibration Characteristics Analysis And Experimental Verification Of High Voltage DC Electromagnetic Relay

The high-voltage direct current electromagnetic relay is a kind of electrical component with control function,and is widely used in various fields such as aerospace,electric vehicle,and defense industry.The high-voltage DC electromagnetic relay is used in the starting circuit of each system.Because the circuit current is huge during the startup and disconnection process,the vibration of the system will cause the arc to be severe,and the adhesion will seriously affect the stability of the system and the relay.Service life.At present,the research on relays mostly focuses on the relay electromagnetic system and arc suppression,while the research on the vibration characteristics of the relay is relatively rare.In this paper,the XX high-voltage DC electromagnetic relay is taken as the research object.From the theoretical model,electromagnetic simulation,dynamics simulation and experimental research,the key problems of relay vibration characteristics and working stability in the working process of high-voltage DC electromagnetic relay are studied.Firstly,through the analysis of the structure and working principle of the relay,the theoretical model of the kinematics of the relay and the mathematical model of the collision law between the contacts are established to screen the influencing factors of the vibration characteristics of the relay.The finite element model of the relay electromagnetic system is established.The electromagnetic excitation force of the relay is solved,the dynamic equation of the segmentation motion of the high-voltage DC electromagnetic relay and the dynamic equation of the bounce between the contacts are established,and the influence of various factors on the vibration characteristics of the relay is obtained.The relay motion test bench is built.The vibration characteristic information of the relay is extracted,the accuracy of the dynamic model of the whole machine is verified,and the corresponding relationship between the variation law of the influence factors of the relay and the vibration characteristics of the relay is revealed.Through the analysis of the structure and working principle of the relay,the vibration of this type of relay mainly appears in the closing process,and finally determines the relay contact opening distance,overtravel spring preload,return spring preload,U-bracket width and magnetic gap size.As a research factor below.Through the finite element analysis of the relay electromagnetic system,it can be known that the electromagnetic force received by the closed moving core is increased with the decrease of the working air gap,and the saturated electromagnetic force of the electromagnetic system is 160 N.The dynamics of theelectromagnetic relay is established.Studying the influence of various factors on the system vibration,the system vibration is the most stable with the contact opening distance of 0.75 mm.The smaller the over-travel spring pre-pressure is,the system vibration is the most gentle and the system vibration is the most gentle when the pre-pressure is 0N.With the increase of the small spring pre-pressure,the amplitude of the moving contact,the number of vibrations and the time first decrease and then increase,the optimal position appears between 14mm-15 mm,and the width of the U-shaped bracket should be within 4.5mm-5mm,1.8mm It should be the best magnetic gap;set up the relay motion test bench to test the relay vibration.The results show that the correspondence between the experimental rules and the vibration characteristics of the relay is consistent with the simulated law,which provides a reliable design for the similar type of relay.Basis.