Research on the multi-degree-of-freedom and large-displacement motion control of the levitated object makes a contribution to broadening the application field of the Maglev technology. A one-dimensional motion control system and method of the Maglev ball are investigated in this paper. The Maglev ball motion control system is required to have a large operating range. In order to meet this requirement, a novel Maglev system based on double linear hall sensors is designed and implemented. The step-by-step control based on the Proportional-Integral-Derivative (PID) controller is proposed as one method to realize the large step response of the levitated object. The controlled object responds to the successive small step input rather than the large step input. Then, the mathematical model of the system is set up based on the electromagnetic force equation and controller parameters are tuned by following the mathematical model of the Maglev system at different positions. The experimental data show that the position accuracy of the Maglev control system using the PID controller reaches ±0.02 mm. Moreover, step-by-step control can not only safely realize large-displacement motion of the levitated object but also effectively reduce the overshoot of the step response and make the step response process smoother.
The bunching and deflection characteristics of low-power laser beam were investigated under electromagnetic field. On the basis of the Faraday effect, the cylindrical electromagnetic cavity was designed and implemented in the experiments. Several types of the magneto-optical elements were placed in the electromagnetic cavity individually. In the test of the deflection characteristics of low-power laser, the rotating angle, the polarization plane of linearly polarized light which passed through electromagnetic cavity, was measured by polarization extinction. We focus on the relation between the coil current and the rotating angle. The experimental data show that when the coil current varies in the range of 0–5 A, the rotating angles changed from 0° to 24.1°. Then, a fitting formula about the coil current and the rotating angle was obtained from the experimental data using the least square algorithm. The analysis shows that the rotating angle is proportional to the excitation current and the correlation coefficient is more than 0.9995. In order to study the beam bunching characteristics of low-power laser, the area of the laser facula was measured after the low-power laser passed through the electromagnetic cavity. The experiment data show that the laser facula area changes in a small range and the experimental data meet 3σ criteria.
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