Fault tolerant homopolar magnetic bearings

Electrical generator or motor structure – Dynamoelectric – Rotary

Reexamination Certificate

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Reexamination Certificate

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07429811

ABSTRACT:
A magnetic bearing for supporting a spinning shaft in the radial direction and/or the axial direction includes a rotor formed on the shaft and a stator positioned around the rotor. Poles in the stator creates a magnetic field that supports the rotor. The number of poles is at least sufficient to produce a selected control force if there is an at least partial loss of current to one or more of the poles. The bearing also includes a set of permanent magnetic elements associated with the poles that create a homopolar, bias magnetic field. A controller connected to the poles is programmed with instructions to change the current to each pole in response to at least a partial loss of current to one or more of the poles and can include a current distribution matrix for determining a current value for each pole in such instances.

REFERENCES:
patent: 5710494 (1998-01-01), Paweletz
patent: 6078119 (2000-06-01), Satoh et al.
patent: 6297574 (2001-10-01), Schob et al.
patent: 6885121 (2005-04-01), Okada et al.

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