Patent ID: 8115580
Filing Date: 2012-02-14
Classification: G01R

Abstract:
1. A magnetic field adjusting device for mounting on a pole plate mounted on a magnetic field generating source, the magnetic field adjusting device comprising: a plurality of moveable shimming plugs, each mounted in a retaining groove which is configured such that each shimming plug is movable only in the direction of the retaining groove; and a plurality of drive screws engaged respectively with said shimming plugs; wherein, each shimming plug is driven by means of the drive screw engaged therewith, to adjust its position in an installed state within said retaining groove, thereby to effect magnetic field adjustment; the shimming plugs are mounted at the periphery of said pole plate; each retaining groove is oriented in a substantially radial direction of said pole plate; and the periphery of the pole plate is mounted with a ring-shaped part, and said retaining grooves are formed in the ring-shaped part.