Topic

# Eddy current brake

About: Eddy current brake is a research topic. Over the lifetime, 1305 publications have been published within this topic receiving 11127 citations.

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01 Dec 1984

TL;DR: In this article, it was shown that Eddy Currents in Cylindrical Shells due to parallel conductors are due to Circular Loops and Rotating Fields.

Abstract: 1. Introduction. 2. The Electromagnetic Field Equations. 3. Methods of Solution. 4. Integral Formulation. 5. Eddy Current Distribution in Plates. 6. Eddy Currents in Cylindrical Shells due to Parallel Conductors. 7. Eddy Currents in Cylindrical Shells due to Circular Loops. 8. Eddy Currents in Cylindrical Shells due to Rotating Fields. 9. Eddy Currents in Spherical Shells. 10. Eddy Current as a Result of Relative Motion. 11. Transient Phenomena. 12. Fast Fourier Transform Calculation for the Diffusion Equations. Appendices. Subject Index.

188 citations

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TL;DR: In this article, an improved theoretical model of the previously developed system was formulated using the image method, thus allowing the eddy current density to be more accurately computed in addition to the development, modeled, and tested.

Abstract: When a conductive material experiences a time-varying magnetic field, eddy currents are generated in the conductor These eddy currents circulate such that they generate a magnetic field of their own, however the field generated is of opposite polarity, causing a repulsive force The time-varying magnetic field needed to produce such currents can be induced either by movement of the conductor in the field or by changing the strength or position of the source of the magnetic field In the case of a dynamic system the conductor is moving relative to the magnetic source, thus generating eddy currents that will dissipate into heat due to the resistivity of the conductor This process of the generation and dissipation of eddy current causes the system to function as a viscous damper In a previous study, the concept and theoretical model was developed for one eddy current damping system that was shown to be effective in the suppression of transverse beam vibrations The mathematical model developed to predict the amount of damping induced on the structure was shown to be accurate when the magnet was far from the beam but was less accurate for the case that the gap between the magnet and beam was small In the present study, an improved theoretical model of the previously developed system will be formulated using the image method, thus allowing the eddy current density to be more accurately computed In addition to the development of an improved model, an improved concept of the eddy current damper configuration is developed, modeled, and tested The new damper configuration adds significantly more damping to the structure than the previously implemented design and has the capability to critically damp the beam 's first bending mode The eddy current damper is a noncontacting system, thus allowing it to be easily applied and able to add significant damping to the structure without changing dynamic response Furthermore, the previous model and the improved model will lie applied to the new damper design and the enhanced accuracy of this new theoretical model will he proven

155 citations

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TL;DR: In this article, a simple theory of magnetic braking in a thin metal strip is proposed and the predictions of the model are compared to experiment and good agreement is obtained. But the experimental tests were conducted by spinning a thin aluminum disk of large radius between the pole pieces of an electromagnet.

Abstract: A simple theory of magnetic braking in a thin metal strip is proposed. The predictions of the model are compared to experiment and good agreement is obtained. The experimental tests were conducted by spinning a thin aluminum disk of large radius between the pole pieces of an electromagnet. A field range of 0 to 150 mT was used.

149 citations

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Virginia Tech

^{1}TL;DR: In this article, a new modeling technique was proposed for the effective eddy current damper and vibration suppression of a beam using the EDD current Damper, which consists of the permanent magnets and the conducting sheet.

142 citations

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Virginia Tech

^{1}TL;DR: There are several different methods of inducing a time-varying magnetic field, and from each method arises the potential for a different type of damping system as mentioned in this paper, which can be applied to a variety of different structural systems in a number of distinct ways.

Abstract: When a conductive material is subjected to a time-varying magnetic flux, eddy currents are generated in the conductor. These eddy currents circulate inside the con- ductor generating a magnetic field of opposite polarity as the applied magnetic field. The interaction of the two magnetic fields causes a force that resists the change in magnetic flux. However, due to the internal resistance of the conductive material, the eddy currents will be dissipated into heat and the force will die out. As the eddy currents are dissipated, energy is removed from the system, thus producing a damp- ing effect. There are several different methods of inducing a time-varying magnetic field, and from each method arises the potential for a different type of damping system. There- fore, the research into eddy current and magnetic damping mechanisms has led to a diverse range of dampers, many of which are detailed in this paper. The majority of the research in eddy current damping has taken place in the area of mag- netic braking. A second topic that has received significant interest is the use of eddy current dampers for the suppres- sion of structural vibrations. However, much of this research is not concentrated in one area, but has been applied to a variety of different structural systems in a number of distinct ways. In this paper, we review the research into various types of eddy current damping mechanisms and we discuss the future of eddy currents with some potential uses that have not yet been studied.

118 citations