Contactor is a production of large, wide application of electromagnetic devices

Contactor is a production of large, wide application of surface electromagnetic devices are commonly used in the distribution and control of electrical products . Contactor mechanical parameters from the main contacts open , overtravel , early pressure , final pressure and three-phase synchronous main contact and poor , these parameters has an important impact on the performance of the contactor , so the detection of mechanical parameters it is very necessary . At present, although there are some AC contactor mechanical parameters measuring instrument , but failed to electromagnetic bodies early pressure , final pressure , and counter- force  electric meter  and other parameters for accurate measurement. Due to the particularity of the contact structure , which is characteristic of the anti- reaction force of the spring , the contact spring and an auxiliary contact spring and the like. Accordingly, the reaction force characteristic should be between the plurality of springs and the combined effect of the displacement between the movable member , which is an important parameter of the electromagnetic  power transformers  development and performance analysis . However, so far the main contactor is a counter- force characteristics of the spring reaction force characteristics , structural characteristics of the contactor according to a theoretical synthesis reaction and the lack of fit between the actual displacement of the structure , and this theory not reflect the characteristics of the spring reaction force and the contact with the actual structure , processing and properties of the error caused by the deviation . Therefore, the theoretical reaction force characteristics can not be a true reflection of the reaction force and displacement contacts during exercise .