Permanent magnet multipole with adjustable strength

Details Permanent magnet multipole with adjustable strength Permanent magnet multipole with adjustable strength

H - Electricity

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F

317/29.8

H01F 7/02 (2006.01) H01F 3/10 (2006.01) H05H 7/04 (2006.01)

Patent

CA 1214509

PERMANENT MAGNET MULTIPOLE WITH ADJUSTABLE STRENGTH ABSTRACT OF THE DISCLOSURE 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 pro- duced 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 per- manent magnets are provided between the pole pieces to provide additional magnetic flux to the magnetic field without saturating the pole pieces.

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