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Passive magnetic bearings are similar to mechanical bearings in that no active control is necessary for operation. One passive bearing approach utilizes repulsive effects of permanent magnets, which is essentially two magnets repelling each other. Another involves reluctance centering, which is essentially two magnets, or magnetic pole faces, attracting to align poles. In both cases, the developed forces act to cause the rotor to remain in the desired position. This type of bearing system is suited for very lightly loaded systems, or ones with any significant load in only one axis and very limited response necessary from the remaining axes. For a horizontal motor coupled to another machine that has a thrust bearing, it can be a good choice to use two active radial magnetic bearings and a passive axial magnetic bearing.