| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === The spring-actuated cam-linkage operating mechanism in vacuum circuit breakers (VCB) is a vacuum-based power breaker that can interrupt high-voltage currents in an extremely short amount of time. The primary characteristic of such a mechanism is that the high-speed cam must remain in highly continuous contact with the roller follower while interrupting the circuit. The present study designed a cam profile based on three-order polynomial motion curves and created a 3D solid modelling of the VCB operating mechanism. The ADAMS/View software was used to simulate and analyze the motion and dynamics of the mechanism, thereby obtaining the reaction forces of the various rods and springs, velocity of the moveable contact, and other dynamic information, as well as analyzing the load force characteristic curve of the VCB. The present study also adopted the difference between the output force and the resistance force of the VCB operating mechanism as an objective function, and employed Differential Evolution (DE) to optimize the design of the cam mechanism and the four-bar mechanism. The results showed that the optimized designs effectively reduced the output force and surplus energy of the VCB operating mechanism and improved its transmission properties and reduced the Hertz contact stress at the contact surface of the cam, thereby elevating the life of VCB.
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