An Analytical 3-D Model for Calculating Eddy-Current Damping Force for a Magnetic Levitation System With Permanent Magnet

2012 ◽  
Vol 48 (9) ◽  
pp. 2472-2478 ◽  
Author(s):  
Mehran Ebrahimian ◽  
Mohammad Khodabakhsh ◽  
Golamreza Vossoughi
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Magnetic Levitation ◽  
Damping Force ◽  
Levitation System ◽  
Eddy Current Damping ◽  
Magnetic Levitation System ◽  
D Model

Modeling Eddy-Current Damping Force in Magnetic Levitation Systems With Conductors

2017 ◽  
Author(s):  
Mohammad Khodabakhsh ◽  
Mehran Ebrahimian ◽  
Bogdan Epureanu
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Eddy Currents ◽  
Magnetic Levitation ◽  
Analytical Models ◽  
Damping Force ◽  
Element Analysis ◽  
Wide Range ◽  
Eddy Current Damping ◽  
Damping Effects

An analytical method is used to develop a model to calculate steady-state eddy-current damping effects in two configurations of magnetic levitation (maglev) systems. The eddy-current based force (eddy-current force) is used for high precision positioning of a levitated permanent magnet in maglev systems. In these systems, the motion of the levitated permanent magnet and changes of the coil’s currents, generate eddy current in the conductors. The proposed analytical model is used to calculate both effects. A conductive cylindrical shell around the levitated object is implemented as a new technique to generate eddy currents in maglev systems. The model is also employed to obtain eddy-current damping effects in a system with a conductive plate beneath the levitated object. The analytical models match results from high fidelity finite element analysis (FEA) with acceptable accuracy in a wide range of operations. Advantages of the two configurations are discussed.

Modeling and Position Control of a Magnetic Levitation System Calculating Eddy Current Based Damping Force

2014 ◽  
Author(s):  
M. A. Nojoumian ◽  
M. Khodabakhsh ◽  
G. R. Vossoughi
Keyword(s):  
Finite Element Method ◽  
Eddy Current ◽  
Magnetic Dipole Moment ◽  
Position Control ◽  
Magnetic Levitation ◽  
Damping Force ◽  
Damping Effect ◽  
Maximum Value ◽  
Levitation System ◽  
Magnetic Levitation System

In this paper a magnetic levitation system is modeled and an eddy current based damping force is identified and used for position control of the levitated object in the system. In the magnetic levitation technology, contactless manipulation of a levitated object is done by use of magnetic fields. Also, the eddy-current based force is used to damp the motion of the levitated object. Eddy-current is generated in a plate which is placed underneath the levitated object due to the change of current in an electromagnet and the motion of the levitated object. First, using finite element method (FEM), the magnetic levitation system is modeled and the eddy-current based force acting on the levitated object is obtained. The thickness of the plate and the magnetic dipole moment of the levitated object are optimized so that the maximum value of the eddy current based force is gained. The effect of the eddy-current based force on the 2-D motion of the levitated object is studied. Also a controller using the damping effect of the eddy force is designed to control the position of the levitated object in one particular dimension. Results show that the controller can effectively regulate the position of the levitated object.

The Effect of the Distance between the Permanent Magnets on the Levitation Force in Hybrid Magnetic Levitation System

2013 ◽  
Vol 721 ◽  
pp. 278-281
Author(s):  
Jun Ma
Keyword(s):  
Permanent Magnet ◽  
Liquid Nitrogen ◽  
Permanent Magnets ◽  
Magnetic Levitation ◽  
Levitation Force ◽  
Liquid Nitrogen Temperature ◽  
Interaction Force ◽  
Bulk Superconductors ◽  
Levitation System ◽  
Magnetic Levitation System

t has been investigated that the interaction force in hybrid magnetic levitation systems with two GdBCO bulk superconductors and two permanent magnets system and a cubic permanent magnet (PM2) and a cubic permanent magnet (PM3) system in their coaxial configuration at liquid nitrogen temperature. The two single-domain GdBCO samples are of φ20mm and 10mm in thickness, the permanent magnet PM1 is of rectangular parallelepiped shape, the permanent magnets PM2 and PM3 are of cubic shape; the system placed on the middle of system and their coaxial configuration; It is found that the maximum levitation force decreases from 40.6N to 17.8N while the distance (Dpp) between the permanent magnets is increased from 0mm to 24mm and the distance (Dsp) between the two GdBCO bulk superconductors and a cubic permanent magnet PM3 is 0mm, The results indicate that the higher levitation force can be obtained by introducing PM-PM levitation system based on scientific and reasonable design of the hybrid magnetic levitation system, which is helpful for designing and constructing superconducting magnetic levitation systems.

The Effect of the Horizontal Distance between the Permanent Magnets on the Levitation Force in Hybrid Magnetic Levitation System

2013 ◽  
Vol 750-752 ◽  
pp. 987-990
Author(s):  
Jun Ma
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Magnetic Levitation ◽  
Levitation Force ◽  
Liquid Nitrogen Temperature ◽  
Horizontal Distance ◽  
Bulk Superconductor ◽  
Magnet System ◽  
Levitation System ◽  
Magnetic Levitation System

It has been investigated that the interaction force in hybrid magnetic levitation systems with a GdBCO bulk superconductor and a permanent magnet system and two permanent magnets (PM2) and two cubic permanent magnets (PM3) system in their coaxial configuration at liquid nitrogen temperature. A single-domain GdBCO sample is of 20mm and 10mm in thickness, the permanent magnet PM1 is of rectangular parallelepiped shape, the permanent magnets PM2 and PM3 are of cubic shape; the system placed on the middle of system and their coaxial configuration; It is found that the maximum levitation force decreases from 46.3N to 16.3N while the horizontal distance (Dpp) between the rectangle permanent magnet and two cubic permanent magnets (PM2) is increased from 0mm to 24mm and the horizontal distance (Dsp) between a GdBCO bulk superconductor and two cubic permanent magnets (PM3) is 0mm, The results indicate that the higher levitation force can be obtained by introducing PM-PM levitation system based on scientific and reasonable design of the hybrid magnetic levitation system, which is helpful for designing and constructing superconducting magnetic levitation systems.

Analysis of a Permanent Magnet Levitation Actuator With Electromagnetic Control

1991 ◽  
Vol 113 (3) ◽  
pp. 472-478 ◽  
Author(s):  
K. Nagaya ◽  
N. Arai
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Magnetic Levitation ◽  
Control Force ◽  
External Disturbances ◽  
Levitation System ◽  
Magnetic Levitation System ◽  
Electromagnetic Control ◽  
The Masses ◽  
Analytical Expressions

This paper proposes an actuator in the magnetic levitation system using a permanent magnet and an electromagnet. In this system, the gravity force of the masses is supported by a strong permanent magnet in which two identical poles face each other. The vibration due to external disturbances is controlled by use of the electromagnet by changing magnetic fluxes of one of the permanent magnets. The analytical expressions for obtaining the levitation force, spring constant, and the control force versus the electric current in the electromagnet were derived using the equation of the electromagnetic theory. Numerical simulations under the control using the optimal regulator for the magnetically levitated body were carried out. To verify the present theoretical results, experimental results were also obtained.

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