Patent ID: 7800269
Filing Date: 2010-09-21
Classification: F16C

Abstract:
1. A hybrid magnetic bearing having a rotor that rotates while being suspended without contact by a control of a magnetic force of a plurality of electromagnets and permanent magnets, wherein the hybrid magnetic bearing has an upper magnetic bearing and a lower magnetic bearing arranged at its top and bottom axially to the rotation axis of the rotor so that the rotor is sandwiched and there is a predetermined gap, the upper magnetic bearing and the lower magnetic bearing have a plurality of electromagnets and 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 having the commutating pole permanent magnet are provided in a protruding condition axially 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, the permanent magnet is provided between electromagnets provided in the upper magnetic bearing, and the permanent magnet is also provided between the electromagnets in the lower magnetic bearing, and an end plane of the main pole of the upper magnetic bearing and an end plane of the main pole of the lower magnetic bearing are arranged oppositely to each other across the rotor.