Conference Paper

High-Precision and Decomposition Control of Several Permanent Magnet Linear Motors for Magnetic Levitation

Power Facility Diagnosis Res. Group, Korea Electrotechnol. Res. Inst., Changwon
DOI: 10.1109/PESC.2006.1711918 Conference: Power Electronics Specialists Conference, 2006. PESC '06. 37th IEEE
Source: IEEE Xplore

ABSTRACT In this paper, we introduce two position control scheme; the lead-lag control and the sliding mode control for a stage system, which is levitated and driven by electric magnetic actuators. This consists of a levitating object (called platen) with 4 permanent magnetic linear synchronous motors in parallel. Each motor generates vertical force for suspension against gravity and propulsion force horizontally as well. This stage can generate six degrees of freedom motion by the vertical and horizontal forces. Dynamic equations of the stage system are derived simply. The sliding mode control algorithm is more effective than the lead-lag control algorithm to reduce effects from movements and disturbances of other axis

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    ABSTRACT: A permanent magnet linear synchronous motor (PMLSM) digital signal processor-based drive including both sliding-mode controller and fuzzy deadzone estimator is developed to steer the mover position of the PMLSM. The sliding-mode controller with integral operation will provide properties of fast response and insensitive to parameter variations and external disturbance. By utilizing the concept of deadzone compensation to eliminate steady-state errors, the fuzzy deadzone estimator will overcome the problem resulting from the unknown upper bound of lumped uncertainty in sliding-mode control. Finally, the effectiveness of the proposed control schemes is demonstrated by experimental results of tracking square-wave and sinusoidal reference trajectories.
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