2006, Volume 1, Issue 1
Frontiers of Mechanical Engineering >> 2006, Volume 1, Issue 1 doi: 10.1007/s11465-005-0013-8
Research on Microelectromagnetic Relays
College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100022, China
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Abstract
A new microelectromagnetic relay is presented and fabricated based on micromachining technology, aiming at the miniaturization and high manufacturing efficiency of electromagnetic relays. This microrelay is composed of a lower magnetic circuit, a planar exciting coil, and an upper magnetic armature. A complete magnetic circuit is composed, and the ON and OFF states are controlled by the current of the exciting coil. The dimension of this microrelay is 5 mm ? 5 mm ? 0.4 mm. The fabrication process mainly includes lithography, sputtering, electroplating, etching, sacrifice-layer technology, etc. Electromagnetic force is calculated theoretically. The calculation results are used for the optimization design of the armature and the number of turns of the exciting coil. A microelectromagnetic relay is fabricated and the initial test results are given. The resistance of the exciting coil is about 300 Ω. The switch-on state resistance is about 1.7 Ω at an exciting current of about 50 mA.
Keywords
sacrifice-layer technology ; OFF ; complete ; microelectromagnetic ; Electromagnetic
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