A Robust Solution for Hesitate Phenomenon in Closing Process of Sealed Electromagnetic Relay

摘要

To the Sealed Electromagnetic Relay (SEMR) of small batch and having difficulty in automatic production, so much manual work involved in assembly and adjustment process makes a remarkable hesitate phenomenon. A certain type of SEMR for example, the problem of coil voltage difference in actual production process has been studied in this article. The primary cause of this issue, 2-steps of armature motion in pickup process, has been found by analyzing the matching characteristics of electromagnetic torque and mechanical torque in SEMR. Through optimization of matching characteristics, the voltage difference problem is solved by robust design of reverse reed as a key part. The validity of this research has been proved by the comparison of dynamic characteristics simulation and the practical test of the relay products before and after the optimization.