Study on the characteristics of a homemade differential-velocity–type compliant joint for robotic manipulators

Design of a new differential-velocity–type compliant joint with two motors is proposed for robotic manipulators. The speed/output torque of the differential-velocity–type joint is synthesized by controlling the differential speeds of a pair of actuators. Descriptions of the design concept, theoretical analysis, and the experiments are presented in this article. The experimental results showed that (1) the stiffness of the differential-velocity–type joint can be regulated by changing the speeds of both motors, (2) the differential-velocity–type joint actually reduced 7.9%−15.7% time compared with the single-drive joint when performing five cycles of reciprocation, and (3) a new design of delta-type robot with differential-velocity–type driving modules was developed for verification. The experimental results showed that the differential-velocity–type delta robot can perform flexible assembly operations within a 0.028-mm tolerance.

[1]  Antonio Bicchi,et al.  Design and Control of a Variable Stiffness Actuator for Safe and Fast Physical Human/Robot Interaction , 2005, Proceedings of the 2005 IEEE International Conference on Robotics and Automation.

[2]  William S. Harwin,et al.  Impedance control of redundant drive joints with double actuation , 2009, 2009 IEEE International Conference on Robotics and Automation.

[3]  A. Bicchi,et al.  Neural network based robust adaptive control for a variable stiffness actuator , 2008, 2008 16th Mediterranean Conference on Control and Automation.

[4]  Matthew M. Williamson,et al.  Series elastic actuators , 1995, Proceedings 1995 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human Robot Interaction and Cooperative Robots.

[5]  Nikolaos G. Tsagarakis,et al.  A position and stiffness control strategy for variable stiffness actuators , 2012, 2012 IEEE International Conference on Robotics and Automation.

[6]  Han-Pang Huang,et al.  Active Variable Stiffness Elastic Actuator: design and application for safe physical human-robot interaction , 2010, 2010 IEEE International Conference on Robotics and Biomimetics.

[7]  Jae-Bok Song,et al.  Double Actuator Unit with Planetary Gear Train for a Safe Manipulator , 2007, Proceedings 2007 IEEE International Conference on Robotics and Automation.

[8]  Jae-Bok Song,et al.  A Serial-Type Dual Actuator Unit With Planetary Gear Train: Basic Design and Applications , 2010, IEEE/ASME Transactions on Mechatronics.

[9]  Han-Pang Huang,et al.  An active-passive variable stiffness elastic actuator for safety robot systems , 2010, 2010 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[10]  M. Tomizuka,et al.  Control of Rotary Series Elastic Actuator for Ideal Force-Mode Actuation in Human–Robot Interaction Applications , 2009, IEEE/ASME Transactions on Mechatronics.

[11]  L. Zollo,et al.  Soft Robotic Manipulation of Onions and Artichokes in the Food Industry , 2014 .

[12]  Youngjin Choi,et al.  A New Actuator System Using Dual-Motors and a Planetary Gear , 2012, IEEE/ASME Transactions on Mechatronics.

[13]  William S. Harwin,et al.  Design of Redundant Drive Joint with adjustable stiffness and damping mechanism to improve joint admittance , 2009, 2009 IEEE International Conference on Rehabilitation Robotics.

[14]  Jae-Bok Song,et al.  Design and Control of a Variable Stiffness Actuator Based on Adjustable Moment Arm , 2012, IEEE Transactions on Robotics.

[15]  William S. Harwin,et al.  Design of Redundant Drive Joints with Double Actuation using springs in the second actuator to avoid excessive active torques , 2010, 2010 IEEE International Conference on Robotics and Automation.