An electrical device includes an electromagnetic component configured to generate a magnetic flux. The electromagnetic component includes a soft magnetically-conductive material configured to pass magnetic flux therethrough along a flux path. The soft magnetically-conductive material includes at least one grain oriented portion having metal grains that are oriented parallel with respect to the magnetic flux.

Provided is an electric motor which includes an adhesively-laminated core for a stator having excellent productivity and high mechanical strength and that is thus capable of reducing vibration and noise of an electric motor and suppressing iron loss. The adhesively-laminated core for a stator includes electrical steel sheets laminated on each other and each coated on both sides with an insulation coating, and an adhesion part disposed between the electrical steel sheets adjacent to each other in a stacking direction and configured to cause the electrical steel sheets to be adhered to each other. All sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered by the adhesion part, an adhesive forming the adhesion part includes a fast-curing type adhesive and a thermosetting adhesive, and the adhesion part is partially provided between the electrical steel sheets adjacent to each other in the stacking direction.

This new type of transformer comprises a ferromagnetic drum-type core characterized in that the drum core has a plurality of holes or windows parallel to the drum longitudinal shaft to place the windings being the windows arranged close to the periphery of the drum symmetrically distributed at 360° of the circumference, each winding being parallel to the longitudinal shaft of the drum and each one of the windings crossing said longitudinal shaft. The core comprises two main components: a central body and an air gap filling system. The central body is formed by a plurality of silicon steel sheets, stacked one over the other, each of them has slots or spaces on its periphery thereof to place the windings and with an air gap filling system. Said filling system can be: wedge-shaped sheets, set of sheets extending parallel to the shaft of the core or a metal sheet wound around the central body.

In order to provide a method by means of which stacks of laminations can be produced in a simple and efficient manner, it is provided that the method comprises the following: coating one or more laminations with a bonding agent; bonding a plurality of laminations to form a sheet metal laminate by means of a first activation of the bonding agent; dividing the sheet metal laminate to produce a plurality of sheet metal laminate units and/or separating out a plurality of sheet metal laminate units from the sheet metal laminate; and bonding the plurality of sheet metal laminate units to form a stack of laminations by means of a second activation of the bonding agent, one or more parameters differing from one another in the first activation and the second activation.

An apparatus for manufacturing a heat sealing-type rotational laminated core, includes an upper mold and a lower mold, and forming and stacking individual laminar members, the individual laminar members being formed by having a strip which is sequentially transferred on the upper portion of the lower mold undergone a piercing process and a blanking process by punches mounted on the upper mold.

A value of a parameter Q represented by “Q=([Ti]/48+[V]/51+[Zr]/91+[Nb]/93)/([C]/12)” is not less than 0.9 nor more than 1.1, when contents of Ti, V, Zr, Nb, and C (mass %) are represented as [Ti], [V], [Zr], [Nb], and [C] respectively. A matrix of a metal structure is a ferrite phase, and the metal structure does not contain a non-recrystallized structure. An average grain size of ferrite grains constituting the ferrite phase is not less than 30 μm nor more than 200 μm. A precipitate containing at least one selected from the group consisting of Ti, V, Zr, and Nb exists with a density of 1 particle/μm.sup.3 or more in the ferrite grain. An average grain size of the precipitate is not less than 0.002 μm nor more than 0.2 μm.

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.

The invention relates to a method for analysing defects in transformer laminations using an inspection system, and to an inspection system (24), wherein the inspection system comprises a detection unit (26), a conveyance device (27) and a processing device, wherein the detection unit includes an optical detecting device (31), wherein the conveyance device is used to continuously transport a plurality of transformer laminations (25) relative to the detecting device, wherein the detecting device is arranged transversely, preferably orthogonally, to a direction of movement of a transformer lamination, wherein a velocity of movement of a transformer lamination relative to the detecting device is measured via a measurement device (40) of the detection unit, wherein an image of a contour of a transformer lamination is captured with the detecting device, wherein images of a transformer lamination are assembled into a combined image of the transformer lamination via the processing device while considering the velocity of movement of the transformer lamination, wherein a shape of the transformer lamination is determined on the basis of the combined image via the processing device.

Disclosed is a magnetic domain refining method for radiating a laser beam to a surface of a directional electrical steel plate at intervals, which is capable of further reducing noise along with an iron loss reduction effect and further improving iron loss and noise reduction effects in an area where the directional electrical steel plate are bonded together, such as the joint part of the iron core of a transformer. Irradiated radiations formed by a laser beam in at least any one area of the directional electrical steel plate are unfolded in a fan rib form using one point of the directional electrical steel plate as a central point.

An embodiment of the present invention provides an electrical steel sheet including: an upper adhesive layer positioned on an upper surface of an electrical steel sheet; and an lower adhesive layer positioned on a lower surface of the electrical steel sheet, wherein the upper adhesive layer has a pencil hardness of F or lower, and the lower adhesive layer has a pencil hardness of H or higher.