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

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Gravity Compensator for the Roll-pitch Rotation

Roll-pitch 중력 보상 기구 설계

  • 조창현 (조선대학교 제어계측로봇공학과) ;
  • 이우섭 (한국과학기술연구원 인지로봇사업단) ;
  • 강성철 (한국과학기술연구원 인지로봇사업단)
  • Received : 2010.02.18
  • Accepted : 2010.05.29
  • Published : 2010.07.01
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Abstract

This paper presents a gravity compensator for the manipulator of a service robot. The manipulator of a service robot is operated with low velocity for the safety reason in most cases. In this situation gravitational torques generated by the mass of links are often much greater than dynamic torques for motion. A gravity compensator can counterbalance the gravitational torques, thereby enabling to utilize relatively low power motors. In this paper the gravity compensation for the roll-pitch rotation is considered which is often used for the shoulder joints of the manipulator of a service robot or humanoid robot. A gimbals is implemented and two 1-dof gravity compensators are equipped at the base. One compensates the gravitational torque at the roll joint and another provides the compensational torque for the gimbals. Various analyses showed that the proposed compensator can counterbalance the gravitational torques of 87% at the pitch joint and 50% at the roll joint. It is verified from dynamic simulations that the proposed compensator effectively counterbalances the gravitational torques.

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References

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