Electromagnetic Levitation of Solid and Molten Metals

Okress, E. C.; Wroughton, D. M.; Comenetz, G.; Brace, P. H.; Kelly, John C. R.

doi:10.1063/1.1702166

Cited by 21 publications

(27 citation statements)

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“…In order to find stiffness components for the model of 3D axially symmetric MIS, the structure of which has defined in Table 1, terms of Taylor series in (25) are calculated. Using the notation defined in Sec.…”

Section: Appendix B Equation Compilation For Axially Symmetric Mismentioning

confidence: 99%

“…can be simply classified as electrostatic, magnetic and hybrid CS (a combination of different principles, e.g., electrostatic, static magnetic field, variable magnetic field, diamagnetic materials). The electrostatic CS has been already established 25 as the integrated element for L-MEMS, the fabrication process being compatible with MEMS technologies. In contrast to the electrostatic CS in which stable levitation is reached by active control, in a magnetic CS the levitation of the proof mass can be achieved passively.…”

mentioning

confidence: 99%

“…According to the procedure proposed above, first a representative eddy current circuit is defined. Then the equations for coefficients of Taylor series (25) are computed. The distribution of eddy currents generated by the micro-coils can be studied using a similar design of the prototype consisting of four straight wires and a rectangular shaped micro-object.…”

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confidence: 99%

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Stable dynamics of micro-machined inductive contactless suspensions

Poletkin

Wallrabe

et al. 2017

International Journal of Mechanical Sciences

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In this article, we present a qualitative approach to study the dynamics and stability of micro-machined inductive contactless suspensions (MIS). In the framework of this approach, the induced eddy current into a levitated micro-object is considered as a collection of m-eddy current circuits. Assuming small displacements and the quasi- static behaviour of the levitated micro-object, a generalized model of MIS is obtained and represented as a set of six linear differential equations corresponding to six degrees of freedom in a rigid body by using Lagrange-Maxwell formalism. The linear model allows us to investigate the general stability properties of the MIS as a dynamic system, and these properties are synthesized in three major theorems. In particular, we prove that the stable levitation in the MIS without damping is impossible. Based on the approach presented herewith, we give general guidelines for MIS designing. In addition to we demonstrate the successful application of this technique to study the dynamics and stability of the symmetric and axially symmetric MIS designs both based on 3D micro-coil technology.Comment: 39 pages, 11 figure

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Section: Appendix B Equation Compilation For Axially Symmetric Mismentioning

confidence: 99%

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confidence: 99%

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Stable dynamics of micro-machined inductive contactless suspensions

Poletkin

Wallrabe

et al. 2017

International Journal of Mechanical Sciences

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“…without a crucible, it is claimed that this leads to an extremely high degree of purity. The method generally appears to be suitable (Orkress et al 1952, Polonis et al 1954, Schreibe 1953, Weisberg 1959) for application to rather small masses of non-ferrous molten metal, although Schreibe (1953) claims to have suspended 8 kg of molten steel. The coil arrangement of one such piece of equipment is shown in figure 4.…”

Section: 12mentioning

confidence: 99%

Electromagnetic suspension and levitation

Jayawant

1982

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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The phenomenon of levitation has attracted attention from philosophers and scientists in the past. The recent advances, notably in power electronics and magnetic materials, have focused this attention within the last decade on the application of electromagnetic suspension and levitation techniques to advanced ground transportation. Regardless of the fact that there is, in effect, a separate technology involved for each electromagnetic method, the whole subject is given a blanket title of 'maglev'. There is also a very wide range of industrial applications to which magnetic suspension techniques could be profitably applied, particularly in the area of high-speed bearings to reduce noise and to eliminate friction, and yet only high-speed ground transportation has caught the imagination of the media. This review deals with the physics and engineering aspects of the four principal contenders for advanced ground transportation systems and describes the most up-to-date developments in Germany, Japan, USA and the UK in this field. This article also describes some of the very recent challenging developments in the application of electromagnetic suspension and levitation techniques to contactless bearings. A fairly comprehensive bibliography is given to enable the more interested reader to pursue the topic further in any one of the technologies dealt with in this review.

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“…A lossy system of some practical interest not included by these extensions occurs in the theory of electromagnetic levitation (Okress et al 1952). Here, eddy currents are induced in a conducting body by the alternating magnetic field from an excitation coil.…”

Section: Introductionmentioning

confidence: 99%

An Electromagnetic Force Theorem for Quasi-stationary Currents

Smith¹

1965

Aust. J. Phys.

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SummaryIt is shown that the time-averaged magnetic forces produced in a system excited by quasi-stationary currents may be expressed in terms of derivatives of effective inductance parameters in a manner similar to that of magnetostatics. Practical applications of the theorem include electromagnetic levitation, the absolute calibration of electrical measuring instruments, and the assessment of mechanical stresses in magnet assemblies.

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Electromagnetic Levitation of Solid and Molten Metals

Cited by 21 publications

References 0 publications

Stable dynamics of micro-machined inductive contactless suspensions

Stable dynamics of micro-machined inductive contactless suspensions

Electromagnetic suspension and levitation

An Electromagnetic Force Theorem for Quasi-stationary Currents

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