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평판스프링을 가진 열동형 과부하 릴레이 메커니즘의 모델링 및 동적해석
안길영(K. Y. Ahn),정원선(W. S. Chung),오일성(I. S. Oh),신봉수(B. S. Shin),오승우(S. W. Oh),강병덕(B. D. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A thermal overload relay is a device that transmits the off signal to the magnetic contactor before an<br/> electric motor or machine is damaged due to over current. Such a relay generally uses a reversal mechanism<br/> to change rapidly the steady state into the configuration for transmitting the off signal. Here, the mechanism<br/> consists of a flexible flat spring and coil spring. Also, in such a relay, the bimetal used to compensate for the<br/> effect of surrounding temperature acts like a flat spring. In this paper, the dynamic behavior of the relay<br/> mechanism with a reversal mechanism is modeled and analyzed using ADAMS. The flexible flat spring is<br/> modeled using a beam element and its model is verified through the free vibration experiment of the spring.<br/> Comparing the simulation results of the relay with experimental responses, the derived dynamic model is<br/> verified.
박우진(W. J. Park),안길영(K. Y. Ahn),정광영(K. Y. Jeong) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The automatic load transfer switch (ALTS), a kind of electric power switch, typically automatically transfers electrical loads from a normal electrical power source to an emergency electrical power source upon reduction or loss of normal power source voltage. It can also automatically re-transfer the load to the normal power source when the normal voltage has been restored within acceptable limits. The transfer operation of ALTS is accomplished by a spring-driven linkage mechanism. In order to control or delay the transfer switching time, the ALTS studied in this paper uses the superposed leaf springs, which are subjected to impact loadings in contacting with electrical contacts. Therefore, to confirm whether the springs has enough mechanical endurance in ALTS, we build a finite element model of the superposed leaf springs using LS-DYNA and perform the impact and fatigue analysis.