A method for manufacturing a laminated iron core includes setting a blanking position on a strip-shaped workpiece for iron core pieces each including a yoke piece part having a linear shape and a magnetic pole piece part extending from the yoke piece part, such that a pair of iron core pieces are opposed each other and the magnetic pole piece part of one iron core piece is arranged between adjacent magnetic pole piece parts of the other iron core piece among the pair of iron core pieces, simultaneously blanking a front end side of the magnetic pole piece part and a back surface side of the yoke piece part of the one iron core piece from the strip-shaped workpiece before simultaneously blanking those of the other iron core piece from the strip-shaped workpiece, and blanking the iron core pieces from the strip-shaped workpiece.

A method for manufacturing a laminated iron core includes setting a blanking position on a strip-shaped workpiece for iron core pieces each including a yoke piece part having a linear shape and a magnetic pole piece part extending from the yoke piece part, such that a pair of iron core pieces are opposed each other and the magnetic pole piece part of one iron core piece is arranged between adjacent magnetic pole piece parts of the other iron core piece among the pair of iron core pieces, simultaneously blanking a front end side of the magnetic pole piece part and a back surface side of the yoke piece part of the one iron core piece from the strip-shaped workpiece before simultaneously blanking those of the other iron core piece from the strip-shaped workpiece, and blanking the iron core pieces from the strip-shaped workpiece.

A method for producing soft magnetic strip material for roll tape-wound cores with the following steps: preparing a band-shaped material, applying a heat-treatment temperature to the band-shaped material, and applying a tensile force to the temperature-applied band-shaped material in one longitudinal direction of the band-shaped material in order to produce a tensile stress in the band-shaped material, to produce the soft magnetic strip material from the band-shaped material, the method, moreover, comprising determining at least one magnetic measurement value of the soft magnetic strip material that has been produced and controlling the tensile force for setting the tensile stress in a reaction to the determined magnetic measurement value. Furthermore, a device for carrying out the method and a roll tape-wound core produced by means of the method are made available.

An object of the present invention is to improve a mechanical strength and to ensure a low magnetic loss without using a supporting member even when amorphous ribbons are used for an inner core. To attain the object, a stationary induction apparatus core of the present invention includes an inner core formed from the amorphous ribbons and outer cores formed from silicon steel sheets, the outer cores being disposed on two sides of the inner core in a depth direction as opposed to a standing direction of the inner core in such a manner as to sandwich the inner core therebetween.

An object of the present invention is to improve a mechanical strength and to ensure a low magnetic loss without using a supporting member even when amorphous ribbons are used for an inner core. To attain the object, a stationary induction apparatus core of the present invention includes an inner core formed from the amorphous ribbons and outer cores formed from silicon steel sheets, the outer cores being disposed on two sides of the inner core in a depth direction as opposed to a standing direction of the inner core in such a manner as to sandwich the inner core therebetween.

A heat treatment apparatus for a laminated body of amorphous alloy ribbon includes: a lamination jig that holds the laminated body of amorphous alloy ribbon; two heating plates that sandwich the laminated body from upper and lower surfaces in a lamination direction without coming into contact with the lamination jig; and a heating control apparatus that controls a heating temperature of the two heating plates.

The present invention provides a core for an electric current detector in which a plurality of gaps can be formed while the paring of core pieces is maintained, and a method for manufacturing the same. A core for an electric current detector 10 according to the present invention includes: a pair of core pieces 20 and 23 formed by cutting an annular core main body in a radial direction at two positions, the core pieces being arranged such that cross-sectional surfaces 21 and 24 thereof are opposed to each other with a first gap 26 and a second gap 28 being interposed therebetween; a first partial molding 30 that is made of resin and continuously covers the cross-sectional surfaces of the core pieces opposed to each other with the first gap being interposed therebetween and a peripheral surface including the first gap; and a second partial molding 40 that is made of resin and covers portions of peripheral surfaces of the cross-sectional surfaces of the core pieces opposed to each other with the second gap being interposed therebetween, the second partial molding including a second-1 molded member 41 that covers a peripheral surface of one of the cross-sectional surfaces of the core pieces opposed to each other with the second gap being interposed therebetween, and a second-2 molded member 42 that covers a peripheral surface of the other of the cross-sectional surfaces of the core pieces.

The present invention provides a core for an electric current detector in which a plurality of gaps can be formed while the paring of core pieces is maintained, and a method for manufacturing the same. A core for an electric current detector 10 according to the present invention includes: a pair of core pieces 20 and 23 that are obtained by cutting an annular core main body 12 in a radial direction at two positions and are arranged such that cross-sectional surfaces 21 and 24 are opposed to each other with a first gap 26 and a second gap 28 being interposed therebetween; and a first partial molding 30 and a second partial molding 40 that are made of resin and cover portions of the peripheral surfaces of the cross-sectional surfaces of the core pieces opposed to each other with the first gap and the second gap being interposed therebetween. The first partial molding includes a bridge portion 33 that serves as a connection portion and spans the gap.

Embodiments are directed to a method of forming a laminated magnetic inductor and resulting structures having anisotropic magnetic layers. A first magnetic stack is formed having one or more magnetic layers alternating with one or more insulating layers. A trench is formed in the first magnetic stack oriented such that an axis of the trench is perpendicular to a hard axis of the magnetic inductor. The trench is filled with a dielectric material.

Embodiments are directed to a method of forming a magnetic stack arrangement of a laminated magnetic inductor having a high frequency peak quality factor (Q). A first magnetic stack is formed having one or more magnetic layers alternating with one or more insulating layers in a first inner region of a laminated magnetic inductor. A second magnetic stack is formed opposite a surface of the first magnetic stack in an outer region of the laminated magnetic inductor. A third magnetic stack is formed opposite a surface of the second magnetic stack in a second inner region of the laminated magnetic inductor. The insulating layers are formed such that a thickness of an insulating layer in the second magnetic stack is greater than a thickness of an insulating layer in the first magnetic stack.