Composite rare earth magnet and method for separating ferrous material from non-ferrous material
US6104271A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1999 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Aug 31, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0268
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A composite magnet having a steel back plate on which an inner section of a first magnetic material having a high residual magnetic strength and an energy product greater than 25 million and preferably 35 million G-Oe or greater is positioned. Although possessing such high residual magnetic strength, the first magnetic material contained in the inner section comprises less than 1/8 the entire volume of the composite magnet. A barrier surrounds the inner section, and an outer section of a second magnetic material abuts the barrier and surrounds the sides of the first magnetic material. Such second section of magnetic material has a low residual magnetic strength (i.e., 3,800-4,000 G), and an energy product greater than 3 million G-Oe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.