4th Japan-France Cooperative Program Seminar Nara - Japon - 4/7 Oct 2004 Electromagnetic levitation under pulsated magnetic field J. ETAY and B. BARDET.

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Presentation transcript:

4th Japan-France Cooperative Program Seminar Nara - Japon - 4/7 Oct 2004 Electromagnetic levitation under pulsated magnetic field J. ETAY and B. BARDET EPM-Madylam ENSHMG BP S t Martin d'Hères Cedex (FRANCE)

Local balancee.m. shaping Levitation Global balancee.m. levitation

Levitation : main instabilities global oscillations to be eliminated local oscillations to be promoted Cummins D.L. and Blackburn, D.A., 1991, Journal of Fluid Mechanics, vol 224

Why ? levitation - centering heating-exciting 250 kHz 350 kHz 0,1 à 10 Hz Sketch of the TEMPUS-MSL performe measurements of thermophysical properties of liquid metal alloys, in space

How ? Surface tension Viscosity no gravity Lamb, H, 1975, Hydrodynamics, Cambridge University Press

Levitation under pulsated magnetic field accurate measurement a good tool to more accurate measurement easy to use +no-contact + double checking Measuring equipment With our power suppy I

Experimental facility Set-up Nickel physical properties Characteristics of the experiment

achieved levitation achieved melting no thermal equilibrium Experimental Results

Spectra of Io(t) f 2 =0 Hz f 2 =8.5 Hzf 2 =7.5 Hz f 2 =8 Hz

Comparison ∆f1 and peak values ∆f1 is a relevant for the global stability of the load

Conclusions  Stable electromagnetic levitation achieved  Original system of measurement tested  Detection of the state of global stability of the load achieved  Can be use on all induction system powered by triode power supply  To be validate : remote control of f 2 = automatic excitation of the first resonance.