Publication

Eddy current self-field loss in Bi-2223 tapes with ac transport current

Bertrand Dutoit, Svetlomir Stavrev
1998
Journal Articles

Abstract

The a.c. self-field loss in Bi-2223 Ag and Ag-alloy sheathed tapes with different number of filaments has been measured in the range 59-2500 Hz by means of a dual lock-in amplifier technique. We have been able to dissociate quantitatively the different self-field loss contributions: hysteretic, eddy current and flux-creep resistive loss (near Ic) due to their different frequency dependence and the wide frequency range of the measurements. The relative weight of eddy current losses is found to be inversely proportional to the applied current ratio – the higher Ip/Ic, the less is their contribution. Shown are the frequency limits, beyond which eddy current loss has a significant and afterwards a governing contribution to the total a.c. loss in self-field. The distribution of power dissipation in the metal sheath is obtained by software simulation. A comparison has been made between the measured, simulated and theoretically calculated eddy current loss. Investigated is the effect of the sheath geometry and resistivity in reducing the eddy current loss in the measured and simulated tapes.

Official source

https://infoscience.epfl.ch/entities/publication/84024278-bac8-48f0-a8c7-ee55133ada35

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Bertrand Dutoit, Svetlomir Stavrev
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/84024278-bac8-48f0-a8c7-ee55133ada35

About this result

Related concepts (32)

Eddy current

In electromagnetism, eddy currents (also called Foucault's currents) are loops of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor.

Magnetic core

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material.

Induction heating

Induction heating is the process of heating electrically conductive materials, namely metals or semi-conductors, by electromagnetic induction, through heat transfer passing through an inductor that creates an electromagnetic field within the coil to heat up and possibly melt steel, copper, brass, graphite, gold, silver, aluminum, or carbide. An important feature of the induction heating process is that the heat is generated inside the object itself, instead of by an external heat source via heat conduction.

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Eddy current self-field loss in Bi-2223 tapes with ac transport current

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