Permanent magnet multipole with adjustable strength
- Berkeley, CA
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 (United States)
- 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
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
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