High-field, permanent magnet flux source

Details High-field, permanent magnet flux source High-field, permanent magnet flux source

1991-06-03

1992-04-07

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Temperature-responsive type

335306, H01F 100, H01F 700, H01F 702

Patent

active

051032007

ABSTRACT:
A first shell of magnetic material having a hollow cavity is magnetized and as a remanence to produce a first uniform field in the cavity. The first shell has a temperature coefficient such that the first uniform field varies with temperature in a first direction. A second shell, mounted concentrically with the first shell, has a remanence substantially the same as the remanence of the first shell and is magnetized to produce a second uniform field in the cavity in the same direction as the first uniform field. The second shell has a temperature coefficient that is opposite to and much larger than the temperature coefficient of the first shell. Changes in temperature will cause the cavity fields produced by each of the two shells to vary in opposite directions such that there will be virtually no net change in the combined cavity field.

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