Patent ID: 7683514
Filing Date: 2010-03-23
Classification: F16C

Abstract:
1. A hybrid magnetic bearing having a rotor that rotates while being suspended without contact by a controlling magnetic force of a plurality of electromagnets and permanent magnets, wherein the electromagnet has a main pole and a commutating pole, the commutating pole has a commutating pole permanent magnet, the main pole and the commutating pole are provided in a protruding condition radially to the rotor approximately parallel to each other at predetermined intervals, and a control coil is wound around a core (magnetic core) having the main pole and the commutating pole, two of the electromagnets are arranged oppositely to each other across the rotor in an approximate horizontal position, and the rotor is arranged so as to have a predetermined gap with the main pole and the commutating pole, and the permanent magnet is provided between the adjacent electromagnets; wherein the commutating pole permanent magnet is arranged so that its polarity is the same as the polarity of the commutating pole in the electromagnet placed oppositely, and the polarity is different from the polarity of the commutating pole of the adjacent electromagnet, the polarity of the permanent magnet arranged so as to sandwich the electromagnet is placed so that a polarity different from the polarity of an end of the commutating pole permanent magnet is oriented toward the electromagnet.