This paper presents methods that use Magnetic Levitation (MagLev) to measure very small differences in density of solid diamagnetic objects suspended in a paramagnetic medium. Previous work in this field has shown that, while it is a convenient method, standard MagLev (i.e., where the direction of magnetization and gravitational force are parallel) cannot resolve differences in density <10(-4) ...

The crystallization of an organic compound can produce a mixture of crystalline solids with different solid-state structures (polymorphs). No convenient method now exists to separate crystals of a single polymorph from a mixture of crystals of different polymorphs. Of the physical properties that might be used to separate polymorphs, density is attractive for two reasons: 1) Different packings ...

Control Strategies and Motion Planning for Nanopositioning Applications with Multi-Axis Magnetic-Levitation Instruments. (May 2007) Huzefa Shakir, B. Tech. (Honors), Indian Institute of Technology, Kharagpur Chair of Advisory Committee: Dr. Won-jong Kim This dissertation is the first attempt to demonstrate the use of magnetic-levitation (maglev) positioners for commercial applications requiring...

This paper investigates the control of a low cost verticalaxis maglev system for mechatronics and controls education. The tabletop maglev system consists of an electromagnetic coil that levitates a ferrous object using an infrared sensor to determine the object’s position. Based on the sensor output, the controller adjusts the coil current, thus changing the magnetic field controlling the levit...

The mechanical rotation of a radially positioned permanent magnet Halbach array above a conducting, non-magnetic, track generates a travelling time-varying field that can inductively create suspension and propulsion forces simultaneously. This ‘Electrodynamic Wheel’(EDW) could be used to create a relatively cheap form of maglev transportation since the track would only consist of thin sheets of...

Shanghai maglev is a very fast traffic tool, so it is very strict with the stability of the roadbed. However, the ground subsidence is a problem in Shanhai because of the poor geological condition and some human-induced factors. So it is necessary to monitor ground subsidence in the area along the Shanghai maglev precisely and frequently. Traditionally, precise levelling method is used to surve...

High-speed maglev trains offer competitive journey-times to automobile and air transport in markets of 60–1000 miles but they have potentially adverse noise impacts. This paper considers the noise characteristics of the Shanghai Maglev Train on residents within 300 m to the track. It shows that the system is about 4–8 dBA quieter than other high-speed systems at comparable speeds with their gui...

The implantability and durability have been for decades the focus of artificial heart R&D. A mini axial and a maglev radial pump have been developed to meet with such requirements.The mini axial pump weighing 27g (incl.5g rotor) has an outer diameter of 21mm and a length of 10mm in its largest point, but can produce a maximal blood flow of 6l/min with 50mmHg pressure increase. Therefore, it is ...

This paper presents a control strategy for maglev system based on the sliding mode controller with auto-tuning law. The designed adaptive controller will replace the conventional sliding mode control (SMC) to eliminate the chattering resulting from the SMC. The stability of maglev system is ensured based on the Lyapunov theory. Simulation results verify the effectiveness of the proposed method....

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...