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 Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1397256
- Patent Number(s):
- 9777769
- Application Number:
- 14/530,580
- Assignee:
- Lawrence Livermore National Security, LLC
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F16 - ENGINEERING ELEMENTS AND UNITS F16C - SHAFTS
- 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 = {Tue Oct 03 00:00:00 EDT 2017},
month = {Tue Oct 03 00:00:00 EDT 2017}
}
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Works referenced in this record:
Dynamically stable magnetic suspension/bearing system
patent, February 1996
- Post, Richard F.
- US Patent Document 5,495,221
Passive magnetic bearing element with minimal power losses
patent, December 1998
- Post, Richard F.
- US Patent Document 5,847,480