Halbach Magnetic Array

The Halbach Array is a magnet structure that is a near-ideal structure in engineering. Its goal is to generate the strongest magnetic field with the least amount of magnets. In 1979, American scholar Klaus Halbach discovered this special permanent magnet structure while doing electron acceleration experiments, and gradually improved this structure, eventually forming the so-called "Halbach" magnet. The Halbach magnetic ring combines radial and parallel arrangements of magnets. 

If the end effect is ignored and the magnetic permeability of the surrounding magnetic material is regarded as infinite, then the above permanent magnet structure will eventually form a one-sided field, which is a significant feature of Halbach. This feature indicates that Halbach magnets have good application value in linear motors.