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http://dx.doi.org/10.5302/J.ICROS.2007.13.11.1067

Development of SMH Actuator System Using Hydrogen-Absorbing Alloy  

Kwon, Tae-Kyu (전북대 생체정보공학부)
Hong, Kyung-Ju (전북대 대학원 의용생체공학과)
Kim, Kyung (전북대 대학원 의용생체공학과)
Jeon, Won-Suk (전북대 대학원 기계공학과)
Pang, Du-Yeol (전북대 대학원 기계공학과)
Lee, Seong-Cheol (전북대 대학원 기계공학과)
Kim, Nam-Gyun (전북대 생체정보공학부)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.13, no.11, 2007 , pp. 1067-1073 More about this Journal
Abstract
This paper presents development of an special metal hydride(SMH) actuator system using a peltier module. The newly developed simple SMH actuator, consisting of the plated hydrogen-absorbing alloy as a power source, Peltier elements as a heat source and a cylinder with metal bellows as a functioning part, has been developed. The SMH actuator is characterized by its small size, low weight, noiseless operation and a compliance similar to that of human body. A new SMH actuator that uses reversible reactions between the heat energy and mechanical energy of a hydrogen absorbing alloy. It is well known that hydrogen-absorbing alloys can reversibly absorb and desorb a large amount of hydrogen, more than about 1000 times of their own volume. To improve the thermal conductivity of the hydrogen-absorbing alloy, an electro-less copper plating has been carried out. For this purpose, the effects of the electro-less copper plating and the dynamic characteristics of the SMH actuator have been studied. The hydrogen equilibrium pressure increases and hydrogen is desorbed by heating the hydrogen-absorbing alloys, whereas by cooling the alloys, the hydrogen equilibrium pressure decreases and hydrogen is absorbed. The SMH actuator has the characteristic of being light and easy to use. Therefore, it is suitable for medical and rehabilitation applications.
Keywords
Special Metal Hydride(SMH) actuator; hydrogen-absorbing alloys; rehabilitation equipment; peltier element;
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