A chip inductor comprises a laminate including a plurality of sheets stacked therein; a coil disposed in the laminate and including an exposed portion, in which a portion of the coil is exposed outwardly of at least one surface of the laminate; and a non-magnetic insulating layer disposed on an external surface of the laminate to cover the exposed portion of the coil.

The present invention is directed at a method of production gain oriented Fe—Si steel sheet presenting an induction value at 800 A/m above 1.870 Tesla and a core power loss lower than 1.3 W/kg at a specific magnetic induction of 1.7 Tesla (T). The steel chemical composition comprises, in weight percentage: 2.8≦Si≦4, 0.20≦Cu≦0.6, 0.05≦Mn≦0.4, 0.001≦Al≦0.04, 0.025≦C≦0.05, 0.005≦N≦0.02, 0.005≦Sn≦0.03, S≦0.015 and optionally Ti, Nb, V or B in a cumulated amount below 0.02, the following relationships being respected: Mn/Sn≦40, 2.0≦C/N≦5.0, Al/N≦1.20, and the balance being Fe and other inevitable impurities.

The present invention is directed at a method of production gain oriented Fe—Si steel sheet presenting an induction value at 800 A/m above 1.870 Tesla and a core power loss lower than 1.3 W/kg at a specific magnetic induction of 1.7 Tesla (T). The steel chemical composition comprises, in weight percentage: 2.8≦Si≦4, 0.20≦Cu≦0.6, 0.05≦Mn≦0.4, 0.001≦Al≦0.04, 0.025≦C≦0.05, 0.005≦N≦0.02, 0.005≦Sn≦0.03, S≦0.015 and optionally Ti, Nb, V or B in a cumulated amount below 0.02, the following relationships being respected: Mn/Sn≦40, 2.0≦C/N≦5.0, Al/N≦1.20, and the balance being Fe and other inevitable impurities.

A stationary induction apparatus includes: an iron core with a shaft portion including a plurality of first electromagnetic steel plates stacked in a stacking direction, the shaft portion having a main surface located at each of both ends of the plurality of first electromagnetic steel plates in the stacking direction; a winding wound around the shaft portion; a first magnetic shield arranged along the main surface, the first magnetic shield being configured by stacking a plurality of second electromagnetic steel plates in a direction orthogonal to the stacking direction of the first electromagnetic steel plates; and a second magnetic shield arranged along the main surface, the second magnetic shield being arranged on each of both sides of the first magnetic shield, the second magnetic shield being configured by stacking a plurality of third electromagnetic steel plates in a direction orthogonal to the stacking direction of the second electromagnetic steel plates.

A stationary induction apparatus includes: an iron core with a shaft portion including a plurality of first electromagnetic steel plates stacked in a stacking direction, the shaft portion having a main surface located at each of both ends of the plurality of first electromagnetic steel plates in the stacking direction; a winding wound around the shaft portion; a first magnetic shield arranged along the main surface, the first magnetic shield being configured by stacking a plurality of second electromagnetic steel plates in a direction orthogonal to the stacking direction of the first electromagnetic steel plates; and a second magnetic shield arranged along the main surface, the second magnetic shield being arranged on each of both sides of the first magnetic shield, the second magnetic shield being configured by stacking a plurality of third electromagnetic steel plates in a direction orthogonal to the stacking direction of the second electromagnetic steel plates.

A multilayer coil component includes an element body made of a ferrite sintered body and a coil. The coil is configured with a plurality of internal conductors juxtaposed in the element body and electrically connected to one another. An average crystal grain size in a surface region of the element body is smaller than an average crystal grain size in a region between the internal conductors in the element body. A surface of the element body is covered with a layer made of an insulating material. The insulating material is not present among the crystal grains in the surface region of the element body.

A multilayer coil component includes an element body made of a ferrite sintered body and a coil. The coil is configured with a plurality of internal conductors juxtaposed in the element body and electrically connected to one another. An average crystal grain size in a surface region of the element body is smaller than an average crystal grain size in a region between the internal conductors in the element body. A surface of the element body is covered with a layer made of an insulating material. The insulating material is not present among the crystal grains in the surface region of the element body.

An integrated inductor acquired by integrating a plurality of coils, includes a first coil group arranged with winding axes aligned on a first straight line, and a second coil group arranged with winding axes aligned on a second straight line. The first coil group and the second coil group have respective coils being in a staggered arrangement. The first coil group and the second coil group have respective coils partially overlapping with each other when viewed in a winding axis direction.

An integrated inductor acquired by integrating a plurality of coils, includes a first coil group arranged with winding axes aligned on a first straight line, and a second coil group arranged with winding axes aligned on a second straight line. The first coil group and the second coil group have respective coils being in a staggered arrangement. The first coil group and the second coil group have respective coils partially overlapping with each other when viewed in a winding axis direction.

A transformer core includes: a plurality of core steel laminations; at least one guide slot on a surface of steel sheet forming each of the plurality of core steel laminations; and at least one shape retainer attached to the at least one guide slot joining a plurality of the steel sheets together.