Pump with electrodynamically supported impeller
OwnerWilliam D. Davis, David M. Lancisiinventors
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Abstract
A pump includes an impeller, a stator, and a plurality of permanent magnets forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils coupled to the other of the stator and the impeller. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Currents induced into each coil by a single bearing pole or by a plurality of bearing poles substantially simultaneously produce an electrodynamically generated magnetic field that repels the inducing bearing pole(s) when the impeller is rotating.
Claims23
A pump apparatus comprising;
- an impeller;
- a stator;
- a plurality of permanent magnets forming bearing poles coupled to a selected one of the stator and the impeller;
- and
- a plurality of shorted coils coupled to the other of the stator and the impeller, wherein the plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller.
A pump apparatus comprising:
- an impeller;
- a stator;
- a plurality of magnetic elements forming bearing poles coupled to a selected one of the stator and the impeller, wherein each element has substantially a same magnetization vector throughout;
- and
- a plurality of shorted coils coupled to the other of the stator and the impeller, wherein the plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller.
A pump apparatus comprising:
- an impeller;
- a stator;
- a plurality of magnetic elements forming bearing poles coupled to a selected one of the stator and the impeller, wherein each element has a plurality of magnetic domains having substantially distinct magnetization vectors;
- and
- a plurality of shorted coils coupled to the other of the stator and the impeller, wherein the plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller.
Dependencies are inferred from the claim text.