Spherical permanent magnet with equatorial access
US5028903A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0278
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A substantially spherical magnet comprising two facing hemispherical, magnetized and hollow structures is proposed to produce a uniform induction field going from one structure to the other. By spacing sufficiently apart both structures, an equatorial opening is created to provide for the introduction of bodies to be subjected to said induction. It was shown that homogeneity may be reached at a given order if each structure is comprised of rings, shaped like a portion of a spherical crown, obtained by juxtaposition of magnetic blocks, and if the number of blocks in each ring is higher than or equal to four times the number of rings in each structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.