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Title: Electrostatic stabilizer for a passive magnetic bearing system

Patent ·
OSTI ID:1328695

Electrostatic stabilizers are provided for passive bearing systems composed of annular magnets having a net positive stiffness against radial displacements and that have a negative stiffness for vertical displacements, resulting in a vertical instability. Further embodiments are shown of a radial electrostatic stabilizer geometry (using circuitry similar to that employed in the vertical stabilizer). This version is suitable for stabilizing radial (lateral) displacements of a rotor that is levitated by annular permanent magnets that are stable against vertical displacements but are unstable against radial displacements.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC52-07NA27344
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA)
Patent Number(s):
9,464,670
Application Number:
14/928,729
OSTI ID:
1328695
Resource Relation:
Patent File Date: 2015 Oct 30
Country of Publication:
United States
Language:
English

References (12)

Position detection device for magnetic bearing patent December 1985
Dynamically stable magnetic suspension/bearing system patent February 1996
Passive magnetic bearing element with minimal power losses patent December 1998
Combined passive magnetic bearing element and vibration damper patent February 2001
Controlled magnetic bearing device patent February 2003
Full magnetic bearings with increased load capacity patent May 2003
Seal and bearing-free fluid pump incorporating a passively suspended self-positioning impeller patent May 2006
Passive magnetic bearing configurations patent January 2011
Passive Magnetic Bearing Configurations patent-application October 2008
Magnetic Bearing Element with Adjustable Stiffness patent-application December 2011
Stabilization of Rotating Machinery patent-application April 2012
Passive Magnetic Bearing System patent-application July 2012

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