Chapter: Electrical machines : Single Phase Induction Motor and Special Machines

Magnetic Levitation

Magnetic fields are actively excluded from superconductors (Meissner effect).

Magnetic Levitation

Magnetic fields are actively excluded from superconductors (Meissner effect). If a small magnet is brought near a superconductor, it will be repelled becaused induced supercurrents will produce mirror images of each pole. If a small permanent magnet is placed above a superconductor, it can be levitated by this repulsive force. Levitation currents in the superconductor produce effective magnetic poles that repel and support the magnet. The black ceramic material in the illustrations is a sample of the yttrium based superconductor.

By tapping with a sharp instrument, the suspended magnet can be caused to oscillate or rotate. This motion is found to be damped, and will come to rest in a few seconds.

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Electrical machines : Single Phase Induction Motor and Special Machines : Magnetic Levitation |