Mechanism and control of robotic arm using rotational counterweights

Akihiro Kawamura, Byunghyun Gang, Mitsunori Uemura, Sadao Kawamura

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


This paper proposes an actuation mechanism of robotic arms using rotational counterweights. The robotic arm is driven by gravitational and inertia forces of the counterweight mounted on links. The joints of the robotic arms are able to rotate freely though this robot does not have any actuators on joints. Thereby, the robot has high joint flexibility. Additionally, the counterweight system reduces the moment applied to base link caused by gravity effect since the posture of the arm keeps a gravitational equilibrium state statically. Therefore, it is expected that the robotic arm is utilized in narrow and high altitude environment or on small vehicles. This paper also proposes a control method of the new robotic arm. The control method realizes precise position control of joint angle. The usefulness of the method is demonstrated by numerical simulations and experiments using a prototype.

Original languageEnglish
Article number7139567
Pages (from-to)2716-2721
Number of pages6
JournalProceedings - IEEE International Conference on Robotics and Automation
Issue numberJune
Publication statusPublished - Jun 29 2015
Externally publishedYes
Event2015 IEEE International Conference on Robotics and Automation, ICRA 2015 - Seattle, United States
Duration: May 26 2015May 30 2015

All Science Journal Classification (ASJC) codes

  • Software
  • Control and Systems Engineering
  • Artificial Intelligence
  • Electrical and Electronic Engineering


Dive into the research topics of 'Mechanism and control of robotic arm using rotational counterweights'. Together they form a unique fingerprint.

Cite this