Research And Design Of AC Contactor For Aircraft

With the improvement of capacity and performance of civil aircraft, the development of variable frequency AC power supply system(360-800Hz) in aircraft puts higher requirements for the breaking performance of contactor as the main power distribution equipment. Compared with the air arc extinguishing technology, the vacuum interrupter has the advantages of good arc extinguishing performance and strong environmental adaptability. Aiming at the design of aero AC contactor under variable frequency AC conditions, a vacuum contactor solution is proposed. First, based on the vacuum interrupter design theory, a miniaturized vacuum interrupter was designed. Then, the mechanical characteristics of the vacuum interrupter are analyzed, and an electromagnetic operating mechanism which can effectively match the load force characteristics is proposed, and the simulation experiment is carried out by using the finite element method. Finally, an engineering prototype is made for experiment. Through the comparison of experimental data and simulation results, the correctness of the design is verified, and the application of vacuum arc extinguishing technology in more-electric aircraft is promoted.