Recommended Control Configurations for DC Drives With Flexible Shafts

Abstract

This article deals with new recommended control structures for adjustable-speed direct current (DC) drives with a flexible shaft. Two cases will be analyzed: a two-inertia system (i.e., single motor driving a load through an elastic coupling; e.g., suction fan drive) and a three-inertia system (i.e., two motors driving a common load through two elastic couplings; e.g., dual-kiln drives). The first recommended control con figuration is an extension of the rigid system controller with an added control term that is proportional to the differential speed. The second recommended configuration is the variable-structure sliding-mode con trol (VSC) that is known to be robust, insensitive to parameter variations, and easy to implement. Simulation results for both structures are presented to illustrate the effectiveness of the proposed controllers.

Keywords

Torsional vibrations DC drives singular perturbations variable structure control

Get full access to this article

View all access options for this article.

References

Bishop, J.A. and Mayer, C.B. , 1979, "A case for high fidelity analysis of non linear electromechanical torsional dynamics, etc," IEEE Trans. Ind. App. 15(2), 201-209.

Butter, D.H.E. , Churches, M.A. , Anbe, Y. , and Naitoh, H. , 1992, "Compensation of a digitaly controlled static power converter for the damping of rolling mill vibration," IEEE Trans. Ind. App. 28(2), 427-433.

Dorling, C.M. and Zinober, A.S.I. , 1986, "Two approaches to hyperplane design in multivariable structure control systems," Int. J. Cont. 44(1), 65-82.

Gao, W. and Hung, J.C. , 1993, "Variable structure control of nonlinear systems: A new approach," IEEE Trans. Ind. Elec. 40(1), 45-55.

Hung, J.Y. , 1991, "Control of industrial robots that have transmission elasticity ," IEEE Trans. Ind. Elec. 38(6), 421-427. Kokotovic , P.V. , Khalil, H.K. , and O'Reilly, J. , 1986, Singular Perturbation Methods in Control: Analysis and Design, Academic Press, London.

Mayer, C.B. , 1981, "Torsional vibration problems and analysis of cement industry ," IEEE Trans. Ind. App. 17(1), 81-89. Mayer, C.B. , 1989, "A recommended new standard electrical supply and control configuration for dual kiln drives ," IEEE Trans. Ind. App 25(3), 465-474.

Utkin, V.I. and Yang, K.D. , 1978, "Methods for constructing discontinuity planes in multidimensional variable structure systems," Automat. Remote Cont. 39, 1466-1470.

Zhang, J. and Barton, T.H. , 1991, "Robustness enhancement of DC drives with a smooth optimal sliding-mode control," IEEE Trans. Ind. App. 27(4), 686-693.