Devising a procedure for the synthesis of electromechanical systems with cascade-enabled fractional-order controllers and their study




electromechanical system, fractional-order controllers, synthesis, fractional-order transfer functions


An approach to the synthesis of automatic control circuits has been proposed, based on a fractional characteristic polynomial, which makes it possible to ensure the desired quality of a transition process under condition for implementing a certain structure of the fractional controller, which depends on the transfer function of a control object. The use of fractional desirable forms extends the range of possible settings of fractional-order controllers in the synthesis of circuits for electrical-mechanical systems, ensures better quality of transients compared to the full-order controllers, and thereby improves the efficiency of synthesized systems. Based on the obtained results of research, it becomes possible to recommend, in order to adjust the circuits for electromechanical systems, using the proposed fractional desirable forms that could meet the desired requirements to the systems of control over electromechanical systems. Construction of electromechanical systems on the principle of control with sequential correction has a significant advantage over other systems, owing to the simplicity of setting each contour, as well as a possibility to implement control coordinate constraints. A procedure for the structural-parametric synthesis of fractional-order controllers has been devised, on condition of their cascading switching in multi-circuit electromechanical systems; the synthesis algorithm of fractional-order controllers for appropriate control circuits has been given. We have synthesized an electromechanical system with cascade switching of controllers by applying the improved method of the generalized characteristic polynomial to choose the structure and parameters of fractional-order controllers and applying the desired form of fractional order. A two-circuit system of subordinate regulation has been considered as an example, in which a control object is the electric drive "thyristor transducer (converter) – engine (motor)". The influence of the synthesized fractional-order controllers on dynamic properties of the electromechanical system "thyristor transducer – engine" has been examined. Our study has shown a possibility to implement the cascading activated controllers for the electromechanical systems where the contours with the transfer full- and fractional-order functions are combined, as well as for systems with fractional-order contours only

Author Biographies

Bohdan Kopchak, Lviv Polytechnic National University Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences, Associate Professor

Department of Electromechatronics and Computerized Electromechanical Systems

Yaroslav Marushchak, Rzeszow University of Technology W. Pola str., 2, Rzeszów, Poland, 35-959

Doctor of Technical Sciences, Professor

Department of Electrical and Based Computer Engineering

Andrii Kushnir, Lviv State University of Life Safety Kleparivska str., 35, Lviv, Ukraine, 79007

PhD, Associate Professor

Department of Observant-Prophylactic Activity and Fire Automation


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How to Cite

Kopchak, B., Marushchak, Y., & Kushnir, A. (2019). Devising a procedure for the synthesis of electromechanical systems with cascade-enabled fractional-order controllers and their study. Eastern-European Journal of Enterprise Technologies, 5(2 (101), 65–71.