Three-Dimensional Position Estimation and Levitation and Conveyance Control for An Active Electromagnetic Levitation Conveyance System

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Generally, a magnetic levitation conveyance system is useful when we convey products without qualitative degradation due to contact. However it is necessary to control the three-dimensional motion of the levitated object and it is difficult to measure the position. Therefore we propose how to estimate three-dimensional position without a position sensor. Four Hall elements are installed on the bottom of the electromagnet instead of the position sensor. A state observer estimates the three-dimensional position of the levitated object from the four Hall voltages and the current and the input voltage to the electromagnet. The magnetic levitation uses a state-feedback control based on the estimated vertical position. A two-degree-of-freedom controller combining an optimal servo control with an integral compensator for disturbances is applied to the magnetic levitation conveyance system. The validity of the proposed method is confirmed by simulation and experiment results.