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Permanent magnet multipole with adjustable strength

Patent ·
OSTI ID:865653
 [1]
  1. Berkeley, CA
+ Show Author Affiliations
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.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 4549155
OSTI ID:
865653
Country of Publication:
United States
Language:
English

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Related Subjects

/335/
additional
additional magnet
additional magnetic
adjustable
adjustably
auxiliary
axis
bring
closer
cobalt
coercive
control
corresponding
coupling
cylindrical
cylindrical sleeve
cylindrical surface
cylindrical surfaces
defined
earth
external
external magnetic
field
field produced
field strength
flux
force
formed
longitudinal
longitudinal axis
magnet
magnetic
magnetic field
magnetic flux
magnetically
magnetically-soft
magnets
material
mounted
multipole
permanent
permanent magnet
permanent magnets
pieces
pole
pole piece
pole pieces
positionable
positioned
preferably
preferably formed
produced
provide
provide additional
provided
rare
rare earth
rec
remanent
respect
rotates
saturating
sleeve
soft
space
space defined
strength
strong
surfaces
symmetrically
symmetrically positioned
therebetween
vary