Halbach magnet structure is a nearly ideal engineering structures, the goal is to generate the most amount of the strongest magnetic field.
Using a special arrangement of the magnet means, the field strength to enhance the direction of the unit. For works there is extremely important.

Halbach Array Magnet

In 1973, the American scholar Mallianson in the structure of the permanent magnet assembly experiments discovered a strange structure of permanent magnets, and called it "Magnetic Curiosity". He was not aware of the value of such a structure. In 1979, the American scholar Klaus Halbach reuse field generated by a variety of permanent magnet structures make electron acceleration experiments, they found this particular permanent magnet structure, and gradually improve the structure, eventually forming the so-called "Halbach" magnet. Halbach magnet Radial ring is combined with parallel arranged together, if you ignore the end effect and the magnetic permeability of the material seen around infinity, then the permanent magnetic field structure eventually formed a unilateral (one-sided field), which is a significant feature of Halbach. This feature means that Halbach magnet linear motor has a good value.