Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1994-01-04
1996-03-26
Ip, Paul
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
3185681, 901 14, 901 46, B25J 1700
Patent
active
055023630
ABSTRACT:
The present invention provides an apparatus for controlling the angular positioning and stiffness modulations of a joint of a robotic manipulator by use of first and second motors and a control mechanisms. The first motor, preferably a direct current motor, controls angular positioning, while the second motor, preferably a servo motor, controls stiffness modulations. The angular positioning and stiffness modulations take place simultaneously, yet independently, thereby preventing interference. The first and second motors and the control mechanism are positioned within a housing. The control mechanism includes a shaft support member and threaded and non-threaded shafts. The threaded and non-threaded shafts extend from the first and second motors through threaded and non-threaded apertures, respectively, in the shaft support member to the housing where the threaded shaft is bearing mounted and the non-threaded shaft is supported in an aperture in the endwall of the housing to connect a pulley outside of the housing which is connected to a joint and link arrangement of a robotic manipulator. The shaft support member translates back and forth within the housing dependent on its position on the threaded shaft. When the shaft support member is nearer the housing endwall, the effective length of the shaft is short, the joint is stiff, effectively making the link stiff. When the shaft support member is nearer the shaft connection end of the motors, the effective length of the shaft is longer, the effective spring is soft, effectively making the actuator and link soft.
REFERENCES:
patent: 3824674 (1974-07-01), Inoyama et al.
patent: 4392776 (1983-07-01), Shum
patent: 4579016 (1986-04-01), Soroka et al.
patent: 4586335 (1986-05-01), Hosoda et al.
patent: 4621965 (1986-11-01), Wilcock
patent: 4664232 (1987-05-01), Takagi et al.
patent: 4666361 (1987-05-01), Kitabatake et al.
patent: 4693666 (1987-09-01), Garin
patent: 4715773 (1987-12-01), Parker et al.
patent: 4783107 (1988-11-01), Parker et al.
patent: 4787813 (1988-11-01), Stevens et al.
patent: 4888538 (1989-12-01), Dimitrov et al.
patent: 4893254 (1990-01-01), Chan et al.
patent: 4921293 (1990-05-01), Ruoff et al.
patent: 4962676 (1990-10-01), Vainstock
patent: 5046375 (1991-09-01), Salisbury, Jr. et al.
patent: 5047701 (1991-09-01), Takarada et al.
patent: 5062673 (1991-11-01), Mimura
patent: 5092646 (1992-03-01), Smallridge
patent: 5174168 (1992-12-01), Takagi et al.
patent: 5189351 (1993-02-01), Torli et al.
patent: 5207114 (1993-05-01), Salisbury, Jr. et al.
patent: 5239246 (1993-08-01), Kim
J. K. Mills, Hybrid Actuator for Robot Manipulators: Design, Control and Performance, 1990 IEEE International Conference on Robotics and Automation, pp. 1872-1878, Cincinnati.
M. T. Mason, Compliance and Force Control for Computer Controlled Manipulators, 1981 IEEE Transactions on Systems, Man and Cybernetics, SMC-11(6), pp. 418-432.
D. E. Whitney, Histoical Perspective and State-of-the-Art in Robot Force Control, IEEE International Conference on Robotics and Automation, pp. 262-268, St. Louis.
N. Hogan, Impedance Control: An Approach to Manipulation Part I-Theory, ASME Journal of Dynamic Systems, Measurement and Control, 1985, 107, pp. 1-7.
Kalkstein Arie
Tasch Uri
Ip Paul
University of Maryland-Baltimore County
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