Back to results
US 7,256,672 B2Granted
Magnetic field generating device and method of shimming thereof
AssigneeGeneral Electric Company
InventorsJinhua Huang, Hongliang Lu
Life of this patent
Estimating the term…
Abstract
A magnetic field generating device is disclosed having an arrangement of permanent magnets, each permanent magnet (PM) having a north end and a south end, and each aligned in the same north-south orientation. The PM arrangement is configured to have a surface at the north polarity end, a surface at the south polarity end, or a surface at both ends. A layer of ferromagnetic material is securely disposed at one of the surfaces of the PM arrangement, the layer having a thickness equal to or less than about 15 millimeters.
Claims6
A method for shimming a magnetic field generating device, comprising:
- positioning a plurality of permanent magnets (PM) to form an arrangement, each permanent magnet having a north end and a south end, and each aligned in the same north-south orientation, the plurality positioned to have a surface at the north polarity end of the PM arrangement, a surface at the south polarity end of the PM arrangement, or a surface at both ends of the PM arrangement;
- forming a shim assembly having a layer comprising a ferromagnetic material securely disposed at a pole face of a PM shim;
- and
- securely positioning the shim assembly at a surface of the PM arrangement, the layer of the shim assembly being positioned facing the surface of the PM arrangement, and the PM shim being positioned on a side of the layer opposite that of the PM arrangement;
- wherein the layer has a thickness equal to or less than about 15 millimeters.
2 more elements
Dependencies are inferred from the claim text.