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Mathematical Problems in Engineering
Volume 2014, Article ID 578569, 14 pages
http://dx.doi.org/10.1155/2014/578569
Research Article

Integrated Feedback Scheduling and Control Codesign for Motion Coordination of Networked Induction Motor Systems

1Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough LE11 3TU, UK
2Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
3Department of Automation, Tsinghua University, Beijing 100084, China

Received 31 May 2013; Revised 28 January 2014; Accepted 29 January 2014; Published 16 March 2014

Academic Editor: M. Onder Efe

Copyright © 2014 Dezong Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper investigates the codesign of remote speed control and network scheduling for motion coordination of multiple induction motors through a shared communication network. An integrated feedback scheduling algorithm is designed to allocate the optimal sampling period and priority to each control loop to optimize the global performance of a networked control system (NCS), while satisfying the constraints of stability and schedulability. A speed synchronization method is incorporated into the scheduling algorithm to improve the speed synchronization performance of multiple induction motors. The rational gain of the network speed controllers is calculated using the Lyapunov theorem and tuned online by fuzzy logic to guarantee the robustness against complicated variations on the communication network. Furthermore, a state predictor is designed to compensate the time delay which occurred in data transmission from the sensor to the controller, as a part of the networked controller. Simulation results support the effectiveness of the proposed control-and-scheduling codesign approach.