Аннотация
A combination of AC excitation and series tuned
circuit can be used to levitate a ferromagnetic object by
magnetic levitation technique. The electromagnet forms the
inductive part of a resonating circuit. The circuit is tuned at a
frequency less than that of the exciting frequency. Therefore
when the distance between the object and the electromagnet
increases, there is fall in inductance of the lifting magnet,
the circuit approaches resonance and the coil current
increases. The magnetic force on the object increases and the
object moves to its desired position. Though the method is
simple, for slow change in coil current the levitated object
may move under influence of gravitational force and come to
rest position. Hence a new circuit with Z-source inverter with
shoot through is designed to bring the levitated object to its
desired position.
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