| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a powder magnetic core which is increased in dielectric strength than ever before, with the magnetic permeability being kept the same as or larger than ever before. <P>SOLUTION: The powder magnetic core contains powder of a magnetic material and binder resin, and satisfies a condition expressed by an expression Vc>E-a×(D×Rm/Dm)<SP>2/3</SP>×100, where D is the apparent density of the powder magnetic core, E is the existing rate of the magnetic material powder on the surface of the powder magnetic core, Rm is the mass ratio of the magnetic material powder to the powder magnetic core, Dm is the real density of the magnetic material powder, Vc is a predetermined threshold value, and (a) is a predetermined coefficient. A unit of D and Dm is g/cm<SP>3</SP>, a unit of E is %, and Rm is a nondimensional quantity. <P>COPYRIGHT: (C)2009,JPO&INPIT |
