DUST CORE, METHOD FOR PRODUCING THE SAME, ELECTRIC MOTOR, AND REACTOR
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United States of America Patent
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Issued Date -
Apr 1, 2010
app pub date -
Apr 18, 2008
filing date -
Apr 20, 2007
priority date (Note) -
Abandoned
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Abstract
According to the present invention, a dust core having excellent insulating properties, high strength, and high density (high magnetic flux density), a method for producing the same, and an electric motor or reactor having a core member composed of the dust core are provided. Therefore, a method for producing a dust core is provided, such method comprising the following steps: a 1.sup.st step of preparing a resin powder 2 and a magnetic powder 1 comprising soft magnetic metal powder (pure iron powder 11) particles each having an insulating film (silica film 12) preliminarily formed on the surface thereof; a 2.sup.nd step of obtaining a powder mixture by mixing the magnetic powder 1 and the resin powder 2; and a 3.sup.rd step of allowing the resin powder 2 to gel in an atmosphere at a certain temperature, press-molding the powder mixture so as to obtain a press molded body 10, and annealing the press molded body 10 so as to produce a dust core 20.
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