Research On Anti-Bounce Buffer System For Extra-High Voltage Contactor

Contactors are a kind of control electrical appliance, which is used to connect and disconnect both AC and DC circuit. They can be used in occasions which require high-frequency or remote control and also has the function of no-voltage protection. The easy production, low cost and high applicability of contactors make them a kind of widely-used fundamental appliance. As the high-performance permanent magnet operators appear, permanent magnet contactors gradually began to attract people’s attention. This new kind of contactors can achieve all the functions of traditional electromagnetic contactors, and also has the advantages of low energy cost, zero temperature rise and low noise. To satisfy the need of high-frequency operation, the moving components have to move at a high speed, which will also cause the bounce problem of the contacts. The traditional method to solve this problem is to improve the structure and characteristic of the electromagnetic driving mechanism. Considering the actual application in some occasions which require high reliability and low cost of the device, this paper proposes a kind of anti-bounce buffer system for extra-high voltage contactor by adding buffer device directly to the original electromagnetic driving mechanism. The research work is divided into the following five chapters.In chapter1, the background of contactors, the research status and the significance of the research work are first introduced. Then the main research contents and some possible difficulties are summarized.In chapter2, the structure and principle of the extra-high voltage contactor in this paper are first introduced. Then the basic buffer system is proposed, and some improvements are made based on the actual situation. At last, the buffer cylinder are designed in detail and the whole buffer system are developed.In chapter3, the mathematical model is built based on theories like pneumatic transmission and kinematics at first. Then the simulation model of the electromagnetic system and the whole system are also built in ANSYS and MATLAB/Simulink. Through comparison of buffer chamber’s pressure and displacement and velocity of armature under different conditions, the influence of different factors on the system’s dynamic characteristics are analyzed. The results provide further guidance to the parameter selection of the system’s design.In chapter4, the experimental platform is developed based on the specific experiment objective and content, and then the influence of factors like the initial pressure of buffer chamber and the diameter of orifice on the buffer system’s dynamic characteristics and the anti-bounce effect is analyzed. As a result, the simulation model is verified and the conclusion is drawn, which is that the buffer system can obtain the best anti-bounce effect through selecting corresponding ranges of initial buffer chamber pressure to different size of orifices. This research result proves that the research objective of this paper’s design can be basically achieved.In chapter5, the full contents of this paper are summarized and some follow-up research tasks are prospected.