Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Development of SMH Actuator System Using Hydrogen-Absorbing Alloy

수소저장합금을 이용한 SMH 액추에이터 시스템 개발

  • 권대규 (전북대 생체정보공학부) ;
  • 홍경주 (전북대 대학원 의용생체공학과) ;
  • 김경 (전북대 대학원 의용생체공학과) ;
  • 전원석 (전북대 대학원 기계공학과) ;
  • 방두열 (전북대 대학원 기계공학과) ;
  • 이성철 (전북대 대학원 기계공학과) ;
  • 김남균 (전북대 생체정보공학부)
  • Published : 2007.11.01
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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.

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References

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