Research on the Tolerance Distribution of Sealed Electromagnetic Relay with Reliability Index

Huimin LIANG  Xuerong YE  Guofu ZHAI  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.8   pp.1164-1172
Publication Date: 2006/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.8.1164
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))
Category: Relays & Switches
sealed electromagnetic relay,  tolerance distribution,  tolerance band,  reliability,  

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At present, during the design of sealed electromagnetic relay, the tolerances of design parameters are given with experience. The designer can't provide quantificational reliability index, and the blindness of tolerance distribution also causes unnecessary increase of machining cost. According to the study of electromagnetic force and spring force characteristics of a certain sealed electromagnetic relay with polarized magnetic system, this paper analyzed the influence of main design parameters' tolerances to the tolerance bands of electromagnetic force and spring force characteristics and achieved the strong correlative factors (viz. design parameters) that have obvious effect on tolerance bands of electromagnetic force and spring force characteristics. Then based on the calculation of reliability, the tolerance distribution method of key design parameters was given. This method not only can make the designed product satisfy requirement of reliability, but also reduce the machining cost.