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 Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1495323
- Patent Number(s):
- 10138938
- Application Number:
- 15/007,156
- Assignee:
- Lawrence Livermore National Security, LLC (Livermore, CA)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F16 - ENGINEERING ELEMENTS AND UNITS F16C - SHAFTS
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
- 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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