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Title: Combined passive magnetic bearing element and vibration damper

Abstract

A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium and dampen transversely directed vibrations. Mechanical stabilizers are provided to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. In a improvement over U.S. Pat. No. 5,495,221, a magnetic bearing element is combined with a vibration damping element to provide a single upper stationary dual-function element. The magnetic forces exerted by such an element, enhances levitation of the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations, and suppresses the effects of unbalance or inhibits the onset of whirl-type rotor-dynamic instabilities. Concurrently, this equilibrium is made stable against displacement-dependent drag forces of the rotating object from its equilibrium position.

Inventors:
 [1]
  1. Walnut Creek, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
873570
Patent Number(s):
6191515
Assignee:
Regents of University of California (Oakland, CA)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F16 - ENGINEERING ELEMENTS AND UNITS F16C - SHAFTS
H - ELECTRICITY H02 - GENERATION H02N - ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
combined; passive; magnetic; bearing; element; vibration; damper; contains; subsystems; support; rotating; dynamic; equilibrium; dampen; transversely; directed; vibrations; mechanical; stabilizers; provided; hold; suspended; speed; exceeded; critical; effects; permitting; achievement; stable; achieved; collection; elements; permanent; magnets; provide; magnetomotive; excitation; improvement; 495; 221; damping; single; upper; stationary; dual-function; forces; exerted; enhances; levitation; external; force; gravity; arising; accelerations; suppresses; unbalance; inhibits; onset; whirl-type; rotor-dynamic; instabilities; concurrently; displacement-dependent; drag; position; bearing element; magnetic force; passive magnetic; magnetic forces; stable equilibrium; vibration damping; magnetic bearing; permanent magnet; permanent magnets; type rotor; passive elements; rotating element; combined passive; forces exerted; forces arising; external forces; dynamic effects; dynamic equilibrium; magnetic subsystems; contains magnetic; /310/

Citation Formats

Post, Richard F. Combined passive magnetic bearing element and vibration damper. United States: N. p., 2001. Web.
Post, Richard F. Combined passive magnetic bearing element and vibration damper. United States.
Post, Richard F. Mon . "Combined passive magnetic bearing element and vibration damper". United States. https://www.osti.gov/servlets/purl/873570.
@article{osti_873570,
title = {Combined passive magnetic bearing element and vibration damper},
author = {Post, Richard F},
abstractNote = {A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium and dampen transversely directed vibrations. Mechanical stabilizers are provided to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. In a improvement over U.S. Pat. No. 5,495,221, a magnetic bearing element is combined with a vibration damping element to provide a single upper stationary dual-function element. The magnetic forces exerted by such an element, enhances levitation of the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations, and suppresses the effects of unbalance or inhibits the onset of whirl-type rotor-dynamic instabilities. Concurrently, this equilibrium is made stable against displacement-dependent drag forces of the rotating object from its equilibrium position.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}