Magnetic bearing apparatus

Details Magnetic bearing apparatus Magnetic bearing apparatus

1997-04-09

1998-04-14

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

36447416, 451294, H02K 709

Patent

active

057396094

ABSTRACT:
A magnetic bearing apparatus comprises a pair of radial magnetic bearings arranged on both sides in the axial direction of an axial magnetic bearing. A pair of first touchdown bearings are arranged at both ends of a spindle. Annular slide bearings are mounted as second touchdown bearings for receiving the spindle on inner peripheral parts of electromagnets in the axial magnetic bearing. The radial internal clearance between the slide bearing and the spindle is larger than the radial internal clearance between the first touchdown bearings and the spindle and is smaller than the radial internal clearance between the radial magnetic bearings and the spindle. Even if a central part of the spindle is deflected at the time of emergency stop, both the first touchdown bearings and the slide bearings receive the spindle, so that the load on the first touchdown bearings can be reduced.

REFERENCES:
patent: 4340261 (1982-07-01), Wehde
patent: 5027280 (1991-06-01), Ando et al.

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