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Title: Passive magnetic bearing elements and configurations utilizing alternative polarization and Amperian current direction

Abstract

A ferromagnetic shield in contact with a magnet bar at the opposite end from the working surfaces of the bar eliminates the field canceling effects that arise from the Amperian currents at that end. The optimum polarization direction for such bars is one that is parallel to the azimuthal coordinate of the bar. The field at the working surface of the bar approaches that of a bar of infinite length because the shield, located on the side opposite to that of the working surface, completely eliminates, or at least substantially reduces, the field cancellation effect that normally would occur. The magnet bars with shields can be assembled on rotors and stators in flywheel storage systems and other rotating machinery.

Inventors:
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1495323
Patent Number(s):
10,138,938
Application Number:
15/007,156
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA) LLNL
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2016 Jan 26
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Post, Richard F. Passive magnetic bearing elements and configurations utilizing alternative polarization and Amperian current direction. United States: N. p., 2018. Web.
Post, Richard F. Passive magnetic bearing elements and configurations utilizing alternative polarization and Amperian current direction. United States.
Post, Richard F. Tue . "Passive magnetic bearing elements and configurations utilizing alternative polarization and Amperian current direction". United States. https://www.osti.gov/servlets/purl/1495323.
@article{osti_1495323,
title = {Passive magnetic bearing elements and configurations utilizing alternative polarization and Amperian current direction},
author = {Post, Richard F.},
abstractNote = {A ferromagnetic shield in contact with a magnet bar at the opposite end from the working surfaces of the bar eliminates the field canceling effects that arise from the Amperian currents at that end. The optimum polarization direction for such bars is one that is parallel to the azimuthal coordinate of the bar. The field at the working surface of the bar approaches that of a bar of infinite length because the shield, located on the side opposite to that of the working surface, completely eliminates, or at least substantially reduces, the field cancellation effect that normally would occur. The magnet bars with shields can be assembled on rotors and stators in flywheel storage systems and other rotating machinery.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}

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