Dynamic stabilization of tuned-circuit levitators

Recent investigations of a relatively new magnetic levitation device are described. This device uses an electromagnet, which is the inductive part of a resonant circuit. If the circuit is properly tuned, static stability is attainable. Levitators built on these lines are simple and reliable. However, it is already well known that a tuned circuit electromagnet on its own is usually not sufficient to maintain levitation for long periods of time, and the suspended object tends to be dynamically unstable. This dynamic instability is prevented by introducing simple electronic or mechanical modifications into the tuned circuit system. Such modifications are described and their investigation is dealt with. The electronic method of stabilization is successfully analyzed by employing the viewpoint of slowly varying quantities. It is believed that the present article is the first to suggest mechanical methods for introducing dynamic stabilization to levitators. It is interesting that mechanical stabilization is achieved without a necessity of employing direct mechanical contact, and the levitated object is suspended freely. The system is stabilized by electro-mechanically coupling an aluminium solid object to the main levitator circuit.