Permanent magnet and shim design
US6946940B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2004 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Aug 9, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3873
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A general method for the design of structures composed of permanent magnetic material for producing and modifying magnetic fields. The method employs a finite set of permissible spatial harmonic modes upon a surface. In particular, it has applications where the structures are finite and open, for which an exact solution is not possible. The method determines an optimum distribution based upon a least squares minimization of the difference between the achievable and desired field within a Region Of Interest (ROI). The method also has application in passively improving the homogeneity of existing magnetic fields (shimming) by distributing magnetic materials in the vicinity of the ROI.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.