SUPPRESSION OF LOAD OSCILLATIONS IN PRECISION SERVOMECHANISMS SENSING ONLY MOTOR POSITION

An analysis of the two-mass model of a servomechanism is first presented in this paper. The analysis stands as a basis for the design of a P/PI controller where suppression of load oscillations, rather than fast setpoint tracking of the motor position is pursued. Further improvements of the load behavior can be achieved by a notch filter placed outside the velocity loop. Simulation results are given to assess the effectiveness of the proposed approach.

[1]  M. Tomizuka,et al.  High performance robust motion control of machine tools: an adaptive robust control approach and comparative experiments , 1997, Proceedings of the 1997 American Control Conference (Cat. No.97CH36041).

[2]  R.D. Lorenz,et al.  Design principles and implementation of acceleration feedback to improve performance of DC drives , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[3]  Yoichi Hori,et al.  Robust servosystem design with two degrees of freedom and its application to novel motion control of robot manipulators , 1993, IEEE Trans. Ind. Electron..

[4]  Masayoshi Tomizuka,et al.  Robust motion controller design for high-accuracy positioning systems , 1996, IEEE Trans. Ind. Electron..

[5]  Thomas M. Jahns,et al.  Pulsating torque minimization techniques for permanent magnet AC motor drives-a review , 1996, IEEE Trans. Ind. Electron..

[6]  Tadashi Yamashita,et al.  Repetitive control to reduce speed ripple caused by strain wave gearing , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[7]  Yoichi Hori,et al.  Robust speed control of DC servomotors using modern two degrees-of-freedom controller design , 1991 .

[8]  Paolo Rocco,et al.  Modeling, identification, and compensation of pulsating torque in permanent magnet AC motors , 1998, IEEE Trans. Ind. Electron..

[9]  Scott M. Babcock,et al.  Inverse dynamics position control of a compliant manipulator , 1987, IEEE J. Robotics Autom..

[10]  Kouhei Ohnishi,et al.  Motion control for advanced mechatronics , 1996 .

[11]  Paolo Rocco,et al.  Alternatives in precise load motion control of two-mass servomechanisms , 2001, 2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Proceedings (Cat. No.01TH8556).

[12]  Bernard Brogliato,et al.  Adaptive Control of Robot Manipulators with Flexible Joints , 1991, 1991 American Control Conference.

[13]  Joachim Holtz,et al.  Identification and compensation of torque ripple in high-precision permanent magnet motor drives , 1996, IEEE Trans. Ind. Electron..

[14]  Riccardo Marino,et al.  Nonlinear control techniques for flexible joint manipulators: A single link case study , 1986, Proceedings. 1986 IEEE International Conference on Robotics and Automation.

[15]  P. Tomei.  An observer for flexible joint robots , 1990 .

[16]  R.D. Lorenz,et al.  High resolution velocity estimation for all digital, AC servo drives , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[17]  D. C. Hanselman,et al.  Techniques for improving resolver-to-digital conversion accuracy , 1991 .

[18]  M. Spong.  Modeling and Control of Elastic Joint Robots , 1987 .

[19]  Slobodan N. Vukosavic,et al.  Suppression of torsional oscillations in a high-performance speed servo drive , 1998, IEEE Trans. Ind. Electron..

[20]  Carlos Canudas de Wit,et al.  A survey of models, analysis tools and compensation methods for the control of machines with friction , 1994, Autom..

[21]  P. Colaneri.  Output stabilization via pole placement of discrete-time linear periodic systems , 1991 .