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Experimental Validation of Deadzone Compensation for a Magnetic Levitation Transporting OLED Displays System

Jaeyoung Kim, Galen B. King, Chang-Hyun Kim, and Chang-Wan Ha*
International Journal of Control, Automation, and Systems, vol. 20, no. 9, pp.2937-2947, 2022

Abstract : "In this research, experimental validation of deadzone compensation for a magnetic levitation transporting organic light-emitting diode (OLED) displays system is investigated. The deadzone is where levitation electromagnets cannot be installed between each module. This is one of the challenges and practical issues in the transport of OLED displays using maglev systems. To achieve this, the heave, roll, and pitch motion of the system should be controlled in the feedback loop to improve the levitation control performance of the carrier in the deadzone. For control design in this region, a cascaded control-based levitation controller along with roll and pitch control utilizing a linear quadratic regulator (LQR) based optimal state feedback-observer compensator is designed. Furthermore, a section control algorithm is proposed to minimize the sudden change of the carrier’s heave motion as it moves along the propulsion axis. The efficacy of the controller is experimentally validated under a similar environment to that of the deadzone. It is shown that the stable levitation control is achieved with the peak to peak variation of the airgap measurements of less than 850 µm without any mechanical shock. Thus, the proposed control strategies are to be an effective way to compensate for the deviations in the deadzone. "

Keyword : "Cascaded control, deadzone, linear quadratic regulator, magnetic levitation, OLED displays, section control. "

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