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마찰효과를 고려한 사이클로이드 감속기의 작용력 해석에 관한 연구
홍진표(J. P. Hong),신중호(J. H. Shin),권순만(S. M. Kwon),장세원(S. W. Jang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A cycloidal speed reducer is a type of the speed reducers of machinery. The cycloidal speed reducer consists of two cycloidal plate gears, housing roller gear, input shaft, output pin and shaft, and eccentric bearings. Especially the cycloidal plate gear has the peculiar parts of the teeth, because of gearing with the housing roller gear that has the several rollers on the circular line. And then all teeth on the cycloidal plate gear can be designed to contact with the rollers on the housing roller gear at the same time. Therefore the cycloidal plate gear has always contact motion with rollers and the force is interacted between roller gear with cycloidal plate gear. Because the contact force and friction force must be required to improve the accuracy in design procedures of cycloidal speed reducers, this paper presents a force analysis considered friction effect approach derived by static force equilibrium condition, geometrical adaptation, instant velocity center method and relative velocity method.
CoFe / Cu / NiFe Pseudo 스핀밸브의 자기저항 특성
최원준(W.J. Choi),홍진표(J. P. Hong),김태송(T. S. Kim),김광윤(K. Y. Kim) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.6
The pseudo spin valve with a structure of Ta/CoFe(t Å)/Cu(30 Å)/NiFe(50 Å)/Ta, showing giant magnetoresistance properties by utilizing coercivity difference between only two soft ferromagnetic layers were produced by d.c UHV magnetron sputtering system. In pseudo spin valve Ta/CoFe/Cu/NiFe/Ta, the magnetic and magnetoresistance properties with change of CoFe thickness were investigated. When the thickness of CoFe was 60 Å, a typical MR curve of pseudo spin valve structure was obtained, showing MR ratio of 3.8% and the coercivity difference of 27.4 Oe with a sharp change of hard layer switching. When the CoFe thickness was varied from 20 to 100 Å, coercivity difference between two layers was increased to 40 Å and decreased to 100 Å gradually. It is thought the change in coercivity of hard layer was due to the crystallinity and magnetostriction of thin CoFe layer. In order to improve the MR property in CoFe/Cu/NiFe trier layer structure, CoFe layer with change of 2-20 Å thick was inserted between Cu and NiFe. When the thickness of CoFe was 10 Å, MR ratio was 6.7%, showing excellent MR property. This indicates 50% higher than that of CoFe/Cu/NiFe pseudo spin valve.