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Title: Passive magnetic bearing systems stabilizer/bearing utilizing time-averaging of a periodic magnetic field

Abstract

A high-stiffness stabilizer/bearings for passive magnetic bearing systems is provide where the key to its operation resides in the fact that when the frequency of variation of the repelling forces of the periodic magnet array is large compared to the reciprocal of the growth time of the unstable motion, the rotating system will feel only the time-averaged value of the force. When the time-averaged value of the force is radially repelling by the choice of the geometry of the periodic magnet array, the Earnshaw-related unstable hit motion that would occur at zero rotational speed is suppressed when the system is rotating at operating speeds.

Inventors:
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1397256
Patent Number(s):
9,777,769
Application Number:
14/530,580
Assignee:
Lawrence Livermore National Security, LLC
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Oct 31
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Post, Richard F. Passive magnetic bearing systems stabilizer/bearing utilizing time-averaging of a periodic magnetic field. United States: N. p., 2017. Web.
Post, Richard F. Passive magnetic bearing systems stabilizer/bearing utilizing time-averaging of a periodic magnetic field. United States.
Post, Richard F. Tue . "Passive magnetic bearing systems stabilizer/bearing utilizing time-averaging of a periodic magnetic field". United States. https://www.osti.gov/servlets/purl/1397256.
@article{osti_1397256,
title = {Passive magnetic bearing systems stabilizer/bearing utilizing time-averaging of a periodic magnetic field},
author = {Post, Richard F.},
abstractNote = {A high-stiffness stabilizer/bearings for passive magnetic bearing systems is provide where the key to its operation resides in the fact that when the frequency of variation of the repelling forces of the periodic magnet array is large compared to the reciprocal of the growth time of the unstable motion, the rotating system will feel only the time-averaged value of the force. When the time-averaged value of the force is radially repelling by the choice of the geometry of the periodic magnet array, the Earnshaw-related unstable hit motion that would occur at zero rotational speed is suppressed when the system is rotating at operating speeds.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {10}
}

Patent:

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