Electromagnetic levitation forces and effective inductance in axially symmetric systems

Etude de la pression exercée par un champ magnétique sur un conducteur plan. Déformations produites

“…Il est plus commode de tirer une valeur globale de Po à partir de la loi de variation de la force en fonction de la distance bobine-plaque d (Smith [11]). où L est l'inductance de l'ensemble bobine-plaque.…”

An Electromagnetic Force Theorem for Quasi-stationary Currents

“…Alternatively, (26) Equati.ons (25) and (26) If x is the actual separation of a body from a coil system, If x becomes the separating force in this direction giving the force used for electromagnet ic levitation (Smith 1965, and unpublished data).…”

“…original excitation current is used to levitate the body. An examination (Smith 1965) of the problem of a ball on the axis of an axially symmetric coil system using a detailed field solution (Brisley and Thornton 1963;Fomin 1964) showed that the resulting axial levitation force F could be written in the form, equivalent to equation (2),…”

A method of noncontact suspension of rotating bodies using electromagnetic forces

“…This method has found application in containerless melting, where a conductor suspended in ac fields melts due to heating by eddy currents. [57][58][59][60][61][62][63][64][65][66] The advantage of noncontact suspension in this case is that the crucible material does not contaminate the melt. While, in this particular application, high losses are beneficial ͑they are needed to melt the conductor͒, in other applications the suspension, in contrast, has to be highly efficient.…”