A well-known method for achieving free levitation of ferromagnetic objects depends on a suspension electromagnetic as the inductive part of a tuned circuit which enables static stability of the suspended object. Dynamic instability appears to be fundamentally inherent to the tuned-circuit system, and causes oscillations of the suspended object. A simplified and economic numerical simulation of tuned-circuit levitators has been obtained by employing the averaging method. The approximate system equations obtained by this method demonstrate the characteristic dynamic instability. A relatively simple analytical tool to deal with the instabilities of a complicated electromechanical system is obtained which may enable further improvements in the design of tuned-circuit levitators. One of the main problems encountered at present is the use of such levitators for heavy duties at mains frequencies.
The inherent dynamic instability of levitators which employ tuned LCR circuits
Die spezifische dynamische Instabilitaet beim Schweben mit abgestimmten LCR-Schaltkreisen
Journal of Applied Science and Engineering. Section A ; 3 , 2 ; 91-100
1978
10 Seiten, 15 Quellen
Article (Journal)
English
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