【Abstract】
In recent years, the large quantity expansion application of the calculator is to tests automatically the development of the system expanded the new path, the technical and quick development in electronics in modern age is again for increase the accuracy that electrical engineering experiment is with the speed,That this dissertation is designed is 40A three pole AC Contactor, The base daring lessons from external sake’s produce design idea and the analysis prototype of a machine being living is gated off ,The magnetic field that the three dimensions finites element based on were analyses electromagnetism system inside distributes , and adopts the BASIC software to the exchange contactor electromagnetic iron to have carried on optimization and design ,Seeking the most splendid design scheme design .The main substance designed is: Contact finger system design together with calculation, Put out arc system design together with calculation and electromagnetism system design together with calculation .
【Keywords】: contactor;contact;arc-extinction-chamber;electromagnet;optimal design