Magnetic rotor bearing with axial stabilisation magnet - has electromagnets supplied with polyphase AC of frequency equal to rotor speed

摘要

The magnetic bearing is for a rotor having ferromagnetic components, supporting it from a stationary portion without contact between them. The field of the axial magnet has a destabilising effect in the radia direction, counteracted by the radial electromagnets, which have two or more contactless feelers measuring deflection of the rotor radially from the desired position and emitting electrical signals. These are amplified by a control unit (31) which is supplied with direct current, and emitted as signals to the electromagnets (25) so as to return the rotor (11) to the desired position, also generating damping force components leading those of the return force by a quarter of a cycle, to counteract rotor deflections resulting from the gyrostatic effect and damp out any radial rotor oscillation.