Halbach Array

Halbach Array

A Halbach array is a special arrangement of permanent magnets which invented by Lawrence Berkeley National Laboratory in 1979. Magnetization direction of two adjacent magnets in halbach arrays differs on a certain angle, thus caused asymmetrical distribution of the magnetic field. It makes the magnetic field on one side of the array stronger, while canceling the field to near zero on the other side.

This is very different from the magnetic field around a single magnet. With a single magnet, you have an equal strength magnetic field on either side of the magnet.Although one-sided flux distributions may seem somewhat abstract, they have a surprising number of applications ranging from the refrigerator magnet to industrial applications such as the brushless motor and magnetic coupling. Klaus Halbach originally invented them to use as wiggler magnets used in particle accelerators and free electron lasers.Halbach arrays are also a key component of the Inductrack maglev train system wherein the Halbach arrays repel loops of wire that form the track after the train has been accelerated to speed, lifting the train.

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