Open AccessImpedance Control Considering Velocity Saturation of a Series Elasticity System with a Motor
Author(s) -
Ren Fukui,
Yasuhito Kusakabe,
Ryojun Ikeura,
Soichiro Hayakawa
Publication year - 2021
Publication title -
journal of robotics and mechatronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 19
eISSN - 1883-8049
pISSN - 0915-3942
DOI - 10.20965/jrm.2021.p0833
Subject(s) - control theory (sociology) , torque , impedance control , electrical impedance , torsion (gastropod) , elasticity (physics) , computer science , engineering , physics , control (management) , medicine , surgery , artificial intelligence , electrical engineering , thermodynamics
Human-machine cooperative robots are required to drive their arms with low impedance and high torque. As a compact mechanism that generates a large torque and has low impedance characteristics, the series elastic drive system, in which an elastic element is inserted between the motor and driving unit, has been proposed. In this paper, we propose a method of applying impedance control to a series elasticity system with a torque-compensating motor that uses a torsion bar as an elastic body that enables its use under high loads. The stability of the system was verified via simulation and experiment by considering the allowable speed and maximum torque of the motor. The experimental results from the conventional system and the proposed system were compared. The proposed system was confirmed to be superior to the conventional system in terms of both stability and tracking performance. Consequently, the effectiveness of our proposed system was confirmed.