This wound core is a wound core including a wound core main body obtained by stacking a plurality of polygonal annular grain-oriented electrical steel sheets in a side view, and the grain-oriented electrical steel sheet has planar portions and bent portions that are alternately continuous in a longitudinal direction, and in at least one bent portion, the crystal grain size Dpx (mm) of the grain-oriented electrical steel sheet is FL/4 or more. Here, FL the an average length (mm) of the planar portions.

Disclosed are a clamping device of a stereoscopic wound iron core transformer and a transformer. The clamping device includes a lower frame, a plurality of upper platen assemblies and a plurality of screw assemblies. The lower frame is configured for being arranged at lower sides of a plurality of coil windings of the stereoscopic wound iron core transformer, the plurality of upper platen assemblies are configured for being distributed at upper sides of the plurality of coil windings, and the lower frame and the upper platen assemblies are connected through the screw assemblies, so as to clamp the coil windings together.

When joining end faces of a plurality of soft magnetic sheets which are superposed in the sheet thickness direction and which are bent at parts forming corner areas of a core, offset of positions of the end faces from the desired positions is suppressed.

In a region of a window part comprised of a region inside of a first part 110 and second part 120, a third part 130 with a length in a longitudinal direction (X-axial direction) the same as a length in the X-axial direction of the window part at the position where the third part 130 is arranged is arranged so as to contact the region of the inner circumferential surface between the first corner area 101 and third corner area 103.

A grain-oriented electrical steel sheet for a wound transformer core. The steel sheet having a sheet thickness t, where t and an iron loss deterioration ratio obtained by subjecting the steel sheet under elliptic magnetization satisfy the following relations: (i) when t?0.20 mm, the iron loss deterioration ratio is 60% or less; (ii) when 0.20 mm<t<0.27 mm, the iron loss deterioration ratio is 55% or less; and (iii) when 0.27 mm?t, the iron loss deterioration ratio is 50% or less. The iron loss deterioration ratio is calculated from ((W.sub.A?W.sub.B)/W.sub.B)?100, where W.sub.A is iron loss under 50 Hz elliptic magnetization of 1.7 T in a rolling direction and 0.6 T in a direction orthogonal to the rolling direction, and W.sub.B is iron loss under 50 Hz alternating magnetization of 1.7 T in the rolling direction.

There is provided a magnetostriction type torque detection sensor which is improved in torque detection sensitivity by increasing respective magnetic paths which are formed between a detected object and a plurality of cores attached to an insulating tubular body in such a manner that a magnetic path which is formed at the detected object is at a predetermined angle to an axis of the detected object.

A plurality of cores is arrayed while being inclined at a predetermined angle to an axis of a detected object, and end surfaces of two-side leg portions are attached in such a way as to face the detected object via an inner circumferential surface of an insulating tubular body.

A core body includes an outer peripheral iron core and at least three iron cores inside the outer peripheral iron core and extending in the radial direction thereof. At least one of the outer peripheral iron core and the at least three iron cores is formed of a hoop material wound body formed by winding a hoop material.

The wound core of the present invention has at least one arbitrary bent region 5A, in a plurality of corner portions (3), in which the corner portion (3) bulges outward to confine the magnetic flux flowing in the wound core so that the angle ? formed by the straight line PQ and the straight line PR satisfies 23????50?.

A wound core with low transformer iron loss and good magnetic characteristics without using two or more types of materials with different magnetic characteristics. The wound core includes a grain-oriented electrical steel sheet as a material and has a flat surface portion, a corner portion adjacent to the flat surface portion, a lap portion in the flat surface portion, and a bent portion in the corner portion, and the ratio of the length of the outer circumference to the length of the inner circumference (the length of the outer circumference/the length of the inner circumference) is 1.70 or less when viewed from the side, and the grain-oriented electrical steel sheet has a magnetic flux density B8 in the range of 1.92 T to 1.98 T at a magnetic field strength H of 800 A/m and has a specified iron loss deterioration rate of 1.30 or less under harmonic superposition.

A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: manufacturing a cold-rolled sheet; forming a groove in the cold-rolled sheet; removing an FeO oxide formed on a surface of the cold-rolled sheet; primary recrystallization annealing the cold-rolled sheet; and applying an annealing separating agent to the primary recrystallized cold-rolled sheet, and secondary recrystallization annealing it, wherein a close contacting property coefficient calculated by Formula 1 below is 0.016 to 1.13.
close contacting property coefficient (S.sub.ad)=(0.8?R)/H.sub.hill-up[Formula 1] (In Formula 1, R represents the average roughness (?m) of the surface of the cold-rolled sheet after the removing of the oxide, and H.sub.hill-up represents the average height (?m) of the hill-up present on the surface of the cold-rolled sheet after the removing of the oxide.).

One object is to lessen the difference between the direction of the magnetic flux and the easy direction of magnetization in a coil element and improve the effective permeability of the coil element. A coil element according to one element of the present invention includes: a coil conductor wound around a coil axis; at least one isotropic magnetic material layer provided on at least one of an upper surface and a lower surface of the coil conductor, the at least one isotropic magnetic material layer being made of an isotropic magnetic material; and at least one anisotropic magnetic material layer provided on an opposite surface of the at least one isotropic magnetic material layer to the coil conductor, the at least one anisotropic magnetic material layer being made of an anisotropic magnetic material having an easy direction of magnetization oriented perpendicular to the coil axis.