Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2005-01-25
2005-01-25
Yu, Justine R. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S423120, C417S410500, C417S352000, C417S353000, C310S090500, C604S150000, C604S151000
Reexamination Certificate
active
06846168
ABSTRACT:
A pump includes an impeller, a stator, and a plurality of 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. Hydrodynamic bearing surfaces are provided for generating a hydrodynamic bearing between the impeller and stator. The plurality of magnets may comprise a plurality of distinct magnetic elements or a single element comprising a plurality of distinct magnetic domains. The plurality of distinct magnetic elements or domains may be arranged to form a Halbach array.
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Davis William D.
Lancisi David M.
Davis William D.
Davis & Associates
Sayoc Emmanuel
Yu Justine R.
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