Magnetic bearing device with a rotating magnetic field

Details Magnetic bearing device with a rotating magnetic field Magnetic bearing device with a rotating magnetic field

1992-04-16

1993-08-17

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310181, H02K 709

Patent

active

052372294

ABSTRACT:
The invention presents a novel magnetic bearing device of a simple design and construction, so that it can be attached to the ends of the driving shaft of a synchronous motor or a servomotor. The device consists of: a rotor having a number of permanent magnets, mounted on a central shaft where the central shaft is connected to a driving shaft of a rotating load of an external apparatus; and a stator surrounding the rotor with an airgap. The stator of the bearing device is provided with a number of electromagnets on the inner circumference which can be energized successively so as to create a rotating magnetic field constituted by opposing or attracting polarities to the field effect polarities created by the moving permanent magnets. An integration of the vertical force components over the inner circumference of the stator provides the total magnitude of the levitation force to support the external load. A theoretical analysis indicates that the levitation force is a constant when the number of poles of the rotating magnetic field is one more that of the PM magnetic field.

REFERENCES:
patent: 4040681 (1977-08-01), van der Heide
patent: 4128280 (1978-12-01), Purtschert
patent: 4841204 (1989-06-01), Studer
patent: 5111102 (1992-05-01), Meeks
patent: 5117142 (1992-05-01), von Zweybergk

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