Circumferentially orientation and magnetizing pattern is not available for arc and ring magnets which comprised of Neodymium magnets and Samarium Cobalt magnets. The most common circumferentially oriented magnets are common Alnico horseshoe magnet, however, whether or not Alnico ring magnets can be oriented and magnetized through circumferential direction? In fact, Alnico ring magnets can achieve circumferentially orientation by using magnetic field generated by electrified straight conductor.

Circumferentially Oriented Magnets in Hysteresis Coupling

In theory, closed circuit means the magnet does not have any exposed poles and will not generate the external magnetic field, then applies no useful application. But in reality, circumferentially oriented magnets can be served to hysteresis coupling as hysteresis part. Hysteresis coupling utilize multi-pole magnetized permanent magnet faces a disc of a non-magnetized hysteresis material which has high residual induction and low coercivity. The permanent magnet with certain arrangement force portions of the hysteresis material to cycle along its minor hysteresis loop. The magnetic material will operate on a minor hysteresis loop when it does not reach saturation, and minor hysteresis loop requires less energy for moving magnet around them which is the basis for hysteresis systems. The turning and braking toque of hysteresis coupling is extremely depends on the dimension, magnetic material, pole number and air gap as below shown, and independent of the relative speed and is fully available even at very low relative speed.