Passive magnetic bearing system
Abstract
An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive/active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.
- Inventors:
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1154655
- Patent Number(s):
- 8823233
- Application Number:
- 12/985,980
- Assignee:
- Lawrence Livermore National Security, LLC (Livermore, CA)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F16 - ENGINEERING ELEMENTS AND UNITS F16C - SHAFTS
- DOE Contract Number:
- AC52-07NA27344
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Post, Richard F. Passive magnetic bearing system. United States: N. p., 2014.
Web.
Post, Richard F. Passive magnetic bearing system. United States.
Post, Richard F. Tue .
"Passive magnetic bearing system". United States. https://www.osti.gov/servlets/purl/1154655.
@article{osti_1154655,
title = {Passive magnetic bearing system},
author = {Post, Richard F.},
abstractNote = {An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive/active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {9}
}
Works referenced in this record:
Hybrid integrated circuit device
patent, February 1996
- Honda, Ziro; Takahashi, Takashi
- US Patent Document 5,495,223
Passive magnetic bearing element with minimal power losses
patent, December 1998
- Post, Richard F.
- US Patent Document 5,847,480
Combined passive bearing element/generator motor
patent, August 2000
- Post, Richard F.
- US Patent Document 6,111,332
Passive magnetic bearing for a horizontal shaft
patent, December 2003
- Post, Richard F.
- US Patent Document 6,657,344
Passive magnetic bearing for a motor-generator
patent, July 2006
- Post, Richard F.
- US Patent Document 7,078,838
Works referencing / citing this record:
Passive magnetic bearing system
patent, September 2014
- Post, Richard F.
- US Patent Document 8,823,233