Field adjusting mechanisms and methods for permanent magnet arrangement with backplate
US6670877B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 25, 2001 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Jan 25, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0278
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for the adjustment of a magnetic field produced by permanent magnet arrangements facing each other across an air gap include a series of ferromagnetic shim blocks individually adjustably positionable within the magnet arrangements to adjust the strength and uniformity of the magnetic field. A backing plate to which the permanent magnets are attached has channels within which adjusting elements are used to move the shim blocks with relation to the permanent magnets, preferably toward or away from the air gap. Shim blocks are arranged in selected geometric arrays and shapes responsive to the geometry of the magnet arrangements and may be formed as toroidal shapes or as individual blocks of varying sizes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.