Structure classification of electromagnetic relays and comparison of typical magnetic system containing permanent magnet

Abstract

The electromagnetic relays have lots of structures and are applied widely in the automation control system in aerospace. Firstly, the structures of aerospace electromagnetic relays (AEMR) were classified. According to the structure arrangement, there are three layers, two layers and one layer structures; from electromagnetic system, there are clapper type, balance armature type, polarized magnetic system and balance force magnetic system; from armature returning mode, there are spring returning, permanent magnet returning, permanent magnet magnetic circuit returning and polarized magnetic circuit returning modes. All of these structures were compared separately. Then, the equivalent magnetic circuit model of the typical polarized magnetic system and balance force magnetic system are founded. The ultimate difference between these magnetic systems was illuminated based on the polarized magnetic system criterion. The research conclusions can be used to direct the design of AEMR.

A New Circuit Model of Bipolar Junction Transistor

“…In fact, MOSFET is somewhat alike electromagnetic relay. The electromagnetic relay uses magnetic force to switch on the connection [3], while a MOSFET control electrons in the vertical direction to turn on a device. Also, there is a special semiconductor device called as insulated gate bipolar transistor (IGBT) for power electronics [4], which has MOS input characteristics and bipolar output characteristic.…”

A New Model of Electromechanical Relays for Predicting the Motion and Electromagnetic Dynamics

“…Control strategies can be found also for other electromechanical devices, e.g., for an electromagnet excited pendulum [15] or for a solenoid valve [16], but they are always dependent on a dynamic model of the system. Considering the large amount of electromagnetic switches in the market [17], the need for new and better dynamic models becomes evident.…”