This paper studies the propellant and levitation forces of a prototype maglev system where the propellant forces are provided by a linear motor system. For this purpose, the mathematical model and method using finite element method coupled to external circuit model is developed. The details of the propellant and levitation forces for a prototype maglev system under different operating condition...

In this paper, H disturbance attenuation control and sliding mode disturbance estimation and compensation control of a magnetic levitation system are studied. A magnetic levitation apparatus is established, and its model is measured. Then the system model is feedback linearized. A H controller is then designed. For comparison, a sliding mode controller and a PID controller also were designed. S...

Magnetic levitation is an interesting phenomenon of lifting/ suspending objects without any physical contact using magnetic power, which finds multitude of applications in modern technologies. The objective of this article is to interactively demonstrate magnetic levitation using a simple experimental setup with intent to increase the efficacy of science and engineering pedagogy in teaching-lea...

-Elimination of frictional losses has been receiving large attention to reduce power consumption and the maintenance cost thus increasing the power efficiency. Considering the above facts, Magnetic levitation technology has given the contribution in industry as a part. Now, since Maglev's are highly nonlinear and inherently unstable, the objective is to design a controller that would be an attr...

This thesis presents the design of two magnetically levitated high precision positioning systems based on permanent magnet linear synchronous motors (PMLSMs). Magnetic levitation based on PMLSMs requires the motors to operate with a variable airgap length but previous research in the field has studied mainly motors fastened by bearings; therefore, this work first models a motor with free normal...

Levitation and controlled motion of matter in air have a wealth of potential applications ranging from materials processing to biochemistry and pharmaceuticals. We present a unique acoustophoretic concept for the contactless transport and handling of matter in air. Spatiotemporal modulation of the levitation acoustic field allows continuous planar transport and processing of multiple objects, f...

Due to the installation error or the roadbed sedimentation, the guide way step error between the two neighbored guide ways is hard to be avoided completely. Our experiments show that the train levitation system will vibrate severely and even become unstable if no effective control strategy be adopted when running across a bigger guide way step error in a higher speed. In order to reject the dis...

A simple experiment illustrating the principles of electrodynamic magnetic suspension is described and test results are given. A disk-shaped coil made of insulated copper magnet wire and energized with 60-Hz ac line voltage is levitated in a stable equilibrium position above a wide aluminum plate. The mechanisms generating levitation force are identified by the use of Maxwell’s equations. A lum...

Abstract In oscillating drop experiments, surface oscillations in a molten sample are captured and analyzed to determine the tension viscosity of melt without need contact liquid sample. electromagnetic levitation, initiated using an excitation pulse field. The variation force field drives rapid acceleration while also changing flow pattern. During quasi-static conditions prior pulse, displays ...

ABSTRACT: Active control is indispensable to electromagnetic suspension system in order to stabilize the open-loop system. For simplicity, linear control strategy is widely utilized in practical maglev systems. However, electromagnetic suspension system is inherently highly nonlinear, which makes linear control strategies sometimes fail in experiments. To conquer the nonlinearity of the suspens...