A DYNAMIC MODEL OF MICROSWITCHES WITH ELASTIC ROD ELEMENTS 

Lyuminarskji Igor Evgenevich, doctor of technical science, professor, sub-departmen of theory of mechanisms and machines, Moscow State Technical University named after N. E. Bauman (105005, 2-nd Baumanskaya street, apartment 5, building 1, Moscow, Russia), lie260@mail.ru
Lyuminarskaja Ekaterina Stanislavovna, candidate of technical science, associate professor, sub-departmen of electrical engineering and industrial electronics, Moscow State Technical University named after N. E. Bauman (105005, 2-nd Baumanskaya street, apartment 5, building 1, Moscow, Russia), lyuminarskaja.caterina@yandex.ru

621.3.06 + 621.01

10.21685/2307-4205-2016-4-5

Relevance and purpose. Microswitches with elastic core elements are widely used in aerospace, automotive, etc. engineering. The bounce in low-voltage contacts of the microswitch rod type mostly appear because of a breakage of the elastic element or spacer springs, sticking the movable contact to contact bounce when switching, sudden change of the pressing force of the contact, contamination of contact surfaces. In this regard, there is the need to identify precursors of failures and failures at the design stage and selection of basic parameters of switches with consideration of possible contamination. A promising direction in solving this problem is mathematical modeling, which allows to investigate the operation of the switches when switching and contact bounce in real conditions.
Materials and methods. The proposed method based on the method of Bubnov-Galerkin and use their own forms of the elastic element with a movable contact as basis functions.
Results. Developed the dynamic model of the micro switches has allowed to establish the dependence of the switching time of the speed of movement of a pusher and a contact bounce three or four razmiene with the time separation of the movable contact 10-140 ISS. The adequacy of the mathematical model is confirmed by experimental data.
Conclusions. Development of dynamic and mathematical models of switches takes into account basic processes proceeding in them at switching, and use them to identify the causes of failures at the design stage.

microswitch, bounce, speed, the rod elastic element, their own forms