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Title: Permanent magnet multipole with adjustable strength

Abstract

Two or more magnetically soft pole pieces are symmetrically positioned along a longitudinal axis to provide a magnetic field within a space defined by the pole pieces. Two or more permanent magnets are mounted to an external magnetically-soft cylindrical sleeve which rotates to bring the permanent magnets into closer coupling with the pole pieces and thereby adjustably control the field strength of the magnetic field produced in the space defined by the pole pieces. The permanent magnets are preferably formed of rare earth cobalt (REC) material which has a high remanent magnetic field and a strong coercive force. The pole pieces and the permanent magnets have corresponding cylindrical surfaces which are positionable with respect to each other to vary the coupling therebetween. Auxiliary permanent magnets are provided between the pole pieces to provide additional magnetic flux to the magnetic field without saturating the pole pieces.

Inventors:
 [1]
  1. (Berkeley, CA)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865653
Patent Number(s):
US 4549155
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
permanent; magnet; multipole; adjustable; strength; magnetically; soft; pole; pieces; symmetrically; positioned; longitudinal; axis; provide; magnetic; field; space; defined; magnets; mounted; external; magnetically-soft; cylindrical; sleeve; rotates; bring; closer; coupling; adjustably; control; produced; preferably; formed; rare; earth; cobalt; rec; material; remanent; strong; coercive; force; corresponding; surfaces; positionable; respect; vary; therebetween; auxiliary; provided; additional; flux; saturating; space defined; preferably formed; cylindrical surface; pole pieces; provide additional; field produced; magnetic flux; permanent magnet; magnetic field; rare earth; permanent magnets; longitudinal axis; field strength; external magnetic; symmetrically positioned; cylindrical sleeve; cylindrical surfaces; additional magnet; pole piece; additional magnetic; /335/

Citation Formats

Halbach, Klaus. Permanent magnet multipole with adjustable strength. United States: N. p., 1985. Web.
Halbach, Klaus. Permanent magnet multipole with adjustable strength. United States.
Halbach, Klaus. Tue . "Permanent magnet multipole with adjustable strength". United States. https://www.osti.gov/servlets/purl/865653.
@article{osti_865653,
title = {Permanent magnet multipole with adjustable strength},
author = {Halbach, Klaus},
abstractNote = {Two or more magnetically soft pole pieces are symmetrically positioned along a longitudinal axis to provide a magnetic field within a space defined by the pole pieces. Two or more permanent magnets are mounted to an external magnetically-soft cylindrical sleeve which rotates to bring the permanent magnets into closer coupling with the pole pieces and thereby adjustably control the field strength of the magnetic field produced in the space defined by the pole pieces. The permanent magnets are preferably formed of rare earth cobalt (REC) material which has a high remanent magnetic field and a strong coercive force. The pole pieces and the permanent magnets have corresponding cylindrical surfaces which are positionable with respect to each other to vary the coupling therebetween. Auxiliary permanent magnets are provided between the pole pieces to provide additional magnetic flux to the magnetic field without saturating the pole pieces.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

Patent:

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