Powder magnetic core

Details Powder magnetic core Powder magnetic core

2005-02-08

2005-02-08

Sheehan, John P (Department: 1742)

Metal treatment

Stock

Magnetic

C148S307000, C148S309000, C075S228000, C075S230000, C075S231000, C075S246000, C252S062550

Reexamination Certificate

active

06852174

ABSTRACT:
There is disclosed a powder magnetic core in which a permeability does not easily drop even when an applied magnetic field intensifies, comprising: a bulk body containing a main component of a powder of an Fe-base alloy having a soft magnetic property, and the balance substantially including a heat-treated insulation binder and a void,wherein an aspect ratio of the powder is in a range of 1 to 1.5, and a volume ratio of the powder in the bulk body is in a range of 40 to 60 volume %, andan initial permeability (μ0) has a value which satisfies 6≦μ0≦20, and a relation of μ/μ0≧0.5 is established between K and A, when the permeability is μ with an applied magnetic field of 24 kA/m.

REFERENCES:
patent: 4985089 (1991-01-01), Yoshizawa et al.
patent: 5178689 (1993-01-01), Okamura et al.
patent: 5252148 (1993-10-01), Shigeta et al.
patent: 5993569 (1999-11-01), Simon et al.
patent: 6419760 (2002-07-01), Takemoto et al.

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