Dust ccre and process for producing the same
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United States of America Patent
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Issued Date -
Dec 1, 2005
app pub date -
Jan 3, 2005
filing date -
Aug 7, 2002
priority date (Note) -
Abandoned
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Abstract
A powdered core made by compacting of a mixture of iron powder and resin powder of insulating binder, wherein the iron powder is composed of atomized iron powder and reduced iron powder, and the resin powder is any one of thermosetting polyimide powder, a mixture of both thermosetting polyimide powder and polytetrafluoroethylene powder, thermoplastic polyimide powder, and a mixture of both thermoplastic polyimide powder and polytetrafluoroethylene powder, which is followed by heat treatment, thereby obtaining a powdered core having high magnetic flux density, low iron loss, and having excellent machinability in shaping, cutting or drilling without forming any,defects such as chipping or cracks.
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