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US 7,843,092 B2Granted
Core and method for producing core
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKazutaka Tatematsu, Ryoji Mizutani, Yasuhiro Endo
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Abstract
Disclosed is a highly heat-resistant core which has a dust core as a base body. A dust core obtained by press-molding magnetic powder particles each of which are covered with an insulating film is used as the base body. An inorganic heat-resistant insulating film is formed on at least a part of a surface of the dust core which faces a winding wire.
Claims1
A method for producing a dust core on which a winding wire is wound, comprising the steps of:
- compacting by charging magnetic powder particles coated with an insulating film into a molding die and press-molding the magnetic powder particles in the molding die;
- etching to remove a surface layer of the press-molded dust core;
- coating an insulating ceramic material on at least a part of the surface of the etched dust core which faces the winding wire;
- and
- heating to perform a heat treatment of the ceramic material-coated dust core to calcine the ceramic material and to anneal the dust core at the same time.
2 more elements
Dependencies are inferred from the claim text.