Permanent magnet multipole with adjustable strength

Patent · Tue Oct 22 00:00:00 EDT 1985

OSTI ID:6034478

Halbach, K

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 eqch 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.

• Assignee: The United States of America as represented by the United States Department of Energy
• Patent Number(s): US 4549155
• OSTI ID: 6034478
• Resource Relation: Patent File Date: Filed date 20 Sep 1982; Other Information: PAT-APPL-420433
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MAGNET POLE PIECES
MAGNETIC FIELDS
MAGNETIC DIPOLES
PERMANENT MAGNETS
DESIGN
FABRICATION
POSITIONING
COBALT
MAGNETIC FIELD CONFIGURATIONS
SUPERCONDUCTING MAGNETS
DIPOLES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
EQUIPMENT
MAGNETS
METALS
MULTIPOLES
SUPERCONDUCTING DEVICES
TRANSITION ELEMENTS
420201* - Engineering- Cryogenic Equipment & Devices