Control of a Direct-Drive Arm

A direct-drive arm is a mechanical arm in which the shafts of articulated joints are directly coupled to the rotors of motors with high torque. Since the arm does not contain transmission mechanisms between the motors and their loads, the drive system has no backlash, small friction, and high mechanical stiffness, all of which are desirable for fast, accurate, and versatile robots. First, the prototype robot is described, and basic feedback compensation is discussed . This compensation significantly reduces the effect of interactions among multiple joints and nonlinear forces. The experiments showed the excellent performance of the direct-drive arm in terms of speed and accuracy.

[1]  Wayne J. Book,et al.  Feedback control of two beam, two joint systems with distributed flexibility , 1975 .

[2]  R. Paul.  Robot manipulators : mathematics, programming, and control : the computer control of robot manipulators , 1981 .

[3]  M. Vukobratovic,et al.  One Engineering Concept of Dynamic Control of Manipulators , 1981 .

[4]  Miomir Vukobratović,et al.  Choice of Decoupled Control Law of Large-Scale Mechanical Systems , 1980 .

[5]  Takeo Kanade,et al.  Design of Direct-Drive Mechanical Arms' , 1983 .

[6]  John M. Hollerbach,et al.  A Recursive Lagrangian Formulation of Maniputator Dynamics and a Comparative Study of Dynamics Formulation Complexity , 1980, IEEE Transactions on Systems, Man, and Cybernetics.

[7]  M. Vukobratovi,et al.  Contribution to the decoupled control of large-scale mechanical systems , 1980 .

[8]  Marc H. Raibert,et al.  Configuration Space Control , 1977 .

[9]  Suguru Arimoto,et al.  An adaptive trajectory control of manipulators , 1981 .

[10]  J. Denavit,et al.  A kinematic notation for lower pair mechanisms based on matrices , 1955 .

[11]  Kasturi V. Rangan.  Position and Velocity Measurement by Optical Shaft Encoders , 1982 .

[12]  Steven Dubowsky,et al.  The application of model-referenced adaptive control to robotic manipulators , 1979 .

[13]  J. Meigs,et al.  WHO Technical Report , 1954, The Yale Journal of Biology and Medicine.

[14]  J. Y. S. Luh,et al.  On-Line Computational Scheme for Mechanical Manipulators , 1980 .

[15]  M. Vukobratovic,et al.  Dynamics of articulated open-chain active mechanisms , 1976 .

[16]  Dragan Stokic,et al.  Contribution to the decoupled control of large-scale mechanical systems , 1980, Autom..