Hybrid dual actuator unit: A design of a variable stiffness actuator based on an adjustable moment arm mechanism

Byeong Sang Kim, Jae-Bok Song

Research output: Chapter in Book/Report/Conference proceedingConference contribution

86 Citations (Scopus)

Abstract

For tasks requiring robot-environment interaction, stiffness control is important to ensure both stable contact motion and collision safety. The variable stiffness approach has been used to address this problem. We propose a hybrid dual actuator unit (HDAU) which is a novel variable stiffness unit design. The HDAU is composed of a hybrid control module based on an adjustable moment arm mechanism and a drive module with two motors. By controlling the relative motion of gears in the hybrid control module, position and stiffness can be simultaneously controlled for the same joint. The HDAU provides a wide range of joint stiffness due to nonlinearity obtained from the adjustable moment arm. The joint stiffness can be kept constant independent of the passive deflection angle of the output shaft. Furthermore, stable interaction can also be achieved because the joint stiffness is indirectly adjusted by position control of the hybrid control module. The characteristics of the HDAU are analyzed in this study. We show by experiment that the HDAU can provide a wide range of stiffness variation and rapid response for stiffness change.

Original languageEnglish
Title of host publicationProceedings - IEEE International Conference on Robotics and Automation
Pages1655-1660
Number of pages6
DOIs
Publication statusPublished - 2010 Aug 26
Event2010 IEEE International Conference on Robotics and Automation, ICRA 2010 - Anchorage, AK, United States
Duration: 2010 May 32010 May 7

Other

Other2010 IEEE International Conference on Robotics and Automation, ICRA 2010
CountryUnited States
CityAnchorage, AK
Period10/5/310/5/7

ASJC Scopus subject areas

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

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  • Cite this

    Kim, B. S., & Song, J-B. (2010). Hybrid dual actuator unit: A design of a variable stiffness actuator based on an adjustable moment arm mechanism. In Proceedings - IEEE International Conference on Robotics and Automation (pp. 1655-1660). [5509264] https://doi.org/10.1109/ROBOT.2010.5509264