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'Hres 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 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.