Composite rare earth magnet and method for separating ferrous ma

Details Composite rare earth magnet and method for separating ferrous ma Composite rare earth magnet and method for separating ferrous ma

1999-08-31

2000-08-15

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335302, 335291, H01F 702

Patent

active

061042714

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.

REFERENCES:
patent: 3784945 (1974-01-01), Baermann
patent: 4544904 (1985-10-01), Tarachand
patent: 5461919 (1995-10-01), Laughlin

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