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Halbach array

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A Halbach array is a special arrangement of permanent magnets (or electromagnets) which augments the magnetic field on one side of the device while canceling the field to zero on the other side. They were originally invented for use in particle accelerators by Klaus Halbach, a retired Lawrence Berkeley National Laboratory physicist.

This device is the fundamental principle behind the Inductrack maglev system, a levitating train that requires no power to levitate, but only to create forward motion. The Halbach arrays repel buried loops of wire after they have been accelerated to speed, lifting the train.

Halbach arrays can be modified into a ring shape, which can provide levitation for a rotating flywheel or motor shaft

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