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Title: Apparatus and method for reducing inductive coupling between levitation and drive coils within a magnetic propulsion system

Abstract

An apparatus and method is disclosed for reducing inductive coupling between levitation and drive coils within a magnetic levitation system. A pole array has a magnetic field. A levitation coil is positioned so that in response to motion of the magnetic field of the pole array a current is induced in the levitation coil. A first drive coil having a magnetic field coupled to drive the pole array also has a magnetic flux which induces a parasitic current in the levitation coil. A second drive coil having a magnetic field is positioned to attenuate the parasitic current in the levitation coil by canceling the magnetic flux of the first drive coil which induces the parasitic current. Steps in the method include generating a magnetic field with a pole array for levitating an object; inducing current in a levitation coil in response to motion of the magnetic field of the pole array; generating a magnetic field with a first drive coil for propelling the object; and generating a magnetic field with a second drive coil for attenuating effects of the magnetic field of the first drive coil on the current in the levitation coil.

Inventors:
 [1]
  1. Walnut Creek, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
873804
Patent Number(s):
US 6250230
Assignee:
Regents of University of California (Oakland, CA)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; reducing; inductive; coupling; levitation; drive; coils; magnetic; propulsion; disclosed; pole; array; field; coil; positioned; response; motion; current; induced; coupled; flux; induces; parasitic; attenuate; canceling; steps; generating; levitating; inducing; propelling; attenuating; effects; levitation coil; magnetic levitation; parasitic current; pole array; magnetic flux; magnetic field; drive coil; inductive coupling; reducing inductive; drive coils; /104/

Citation Formats

Post, Richard F. Apparatus and method for reducing inductive coupling between levitation and drive coils within a magnetic propulsion system. United States: N. p., 2001. Web.
Post, Richard F. Apparatus and method for reducing inductive coupling between levitation and drive coils within a magnetic propulsion system. United States.
Post, Richard F. Mon . "Apparatus and method for reducing inductive coupling between levitation and drive coils within a magnetic propulsion system". United States. https://www.osti.gov/servlets/purl/873804.
@article{osti_873804,
title = {Apparatus and method for reducing inductive coupling between levitation and drive coils within a magnetic propulsion system},
author = {Post, Richard F},
abstractNote = {An apparatus and method is disclosed for reducing inductive coupling between levitation and drive coils within a magnetic levitation system. A pole array has a magnetic field. A levitation coil is positioned so that in response to motion of the magnetic field of the pole array a current is induced in the levitation coil. A first drive coil having a magnetic field coupled to drive the pole array also has a magnetic flux which induces a parasitic current in the levitation coil. A second drive coil having a magnetic field is positioned to attenuate the parasitic current in the levitation coil by canceling the magnetic flux of the first drive coil which induces the parasitic current. Steps in the method include generating a magnetic field with a pole array for levitating an object; inducing current in a levitation coil in response to motion of the magnetic field of the pole array; generating a magnetic field with a first drive coil for propelling the object; and generating a magnetic field with a second drive coil for attenuating effects of the magnetic field of the first drive coil on the current in the levitation coil.},
doi = {},
url = {https://www.osti.gov/biblio/873804}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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