Method of improving magnetic devices by applying AC or pulsed cu

Details Method of improving magnetic devices by applying AC or pulsed cu Method of improving magnetic devices by applying AC or pulsed cu

1989-07-12

1991-07-16

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

148108, 335284, 335297, H01F 1300, C21D 104

Patent

active

050329472

ABSTRACT:
A method of improving the magnetic properties of a ferromagnetic materials is disclosed. The method comprises a step of providing a specimen made of Fe, Ni or Co based amorphous alloys in a magnetizing field and a second step of applying an AC current or pulsed current on the specimen to improve its soft magnetic properties. The applied AC current has a frequency of 50 to 50K Hz, a wave form of either sine wave, triangular wave or square wave, and a current density of 10 to 500 A/cm.sup.2. The magnetic properties of the ferromagnetic materials are improved by a coercivity ratio less than 0.5, a magnetic induction ratio greater than 1 and a core loss ratio less than 0.3.

REFERENCES:
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patent: 4528481 (1985-07-01), Becker et al.
patent: 4554029 (1985-11-01), Schoen et al.
patent: 4842656 (1989-06-01), Maines et al.
patent: 4889568 (1989-12-01), Datta et al.
patent: 4900374 (1990-02-01), Panchanathan

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