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Title: Self-adjusting magnetic bearing systems

Abstract

A self-adjusting magnetic bearing automatically adjusts the parameters of an axially unstable magnetic bearing such that its force balance is maintained near the point of metastable equilibrium. Complete stabilization can be obtained with the application of weak restoring forces either from a mechanical bearing (running at near-zero load, thus with reduced wear) or from the action of residual eddy currents in a snubber bearing. In one embodiment, a torque is generated by the approach of a slotted pole to a conducting plate. The torque actuates an assembly which varies the position of a magnetic shunt to change the force exerted by the bearing. Another embodiment achieves axial stabilization by sensing vertical displacements in a suspended bearing element, and using this information in an electrical servo system. In a third embodiment, as a rotating eddy current exciter approaches a stationary bearing, it heats a thermostat which actuates an assembly to weaken the attractive force between the two bearing elements. An improved version of an electromechanical battery utilizing the designs of the various embodiments is described.

Inventors:
 [1]
  1. (Walnut Creek, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
871731
Patent Number(s):
5783885
Assignee:
Regents of University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
self-adjusting; magnetic; bearing; systems; automatically; adjusts; parameters; axially; unstable; force; balance; maintained; near; metastable; equilibrium; complete; stabilization; obtained; application; weak; restoring; forces; mechanical; running; near-zero; load; reduced; wear; action; residual; eddy; currents; snubber; embodiment; torque; generated; approach; slotted; pole; conducting; plate; actuates; assembly; varies; position; shunt; change; exerted; achieves; axial; sensing; vertical; displacements; suspended; element; information; electrical; servo; third; rotating; current; exciter; approaches; stationary; heats; thermostat; weaken; attractive; elements; improved; version; electromechanical; battery; utilizing; designs; various; embodiments; described; bearing element; bearing elements; stable equilibrium; third embodiment; magnetic bearing; various embodiments; eddy current; eddy currents; force exerted; automatically adjusts; battery utilizing; bearing systems; force balance; electromechanical battery; self-adjusting magnetic; stable magnetic; conducting plate; vertical displacement; improved version; restoring force; tractive force; attractive force; /310/

Citation Formats

Post, Richard F. Self-adjusting magnetic bearing systems. United States: N. p., 1998. Web.
Post, Richard F. Self-adjusting magnetic bearing systems. United States.
Post, Richard F. Thu . "Self-adjusting magnetic bearing systems". United States. https://www.osti.gov/servlets/purl/871731.
@article{osti_871731,
title = {Self-adjusting magnetic bearing systems},
author = {Post, Richard F.},
abstractNote = {A self-adjusting magnetic bearing automatically adjusts the parameters of an axially unstable magnetic bearing such that its force balance is maintained near the point of metastable equilibrium. Complete stabilization can be obtained with the application of weak restoring forces either from a mechanical bearing (running at near-zero load, thus with reduced wear) or from the action of residual eddy currents in a snubber bearing. In one embodiment, a torque is generated by the approach of a slotted pole to a conducting plate. The torque actuates an assembly which varies the position of a magnetic shunt to change the force exerted by the bearing. Another embodiment achieves axial stabilization by sensing vertical displacements in a suspended bearing element, and using this information in an electrical servo system. In a third embodiment, as a rotating eddy current exciter approaches a stationary bearing, it heats a thermostat which actuates an assembly to weaken the attractive force between the two bearing elements. An improved version of an electromechanical battery utilizing the designs of the various embodiments is described.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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