A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40 [μm] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [μm] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.

A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40 [μm] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [μm] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.

A method for manufacturing a magnetic flux concentrator structure comprises the steps of: providing a first stack comprising a plurality of laminated layers, each of said laminated layers being of a first soft ferromagnetic material; providing a second stack comprising a plurality of laminated layers, each of said laminated layers being of a second soft ferromagnetic material having a different magnetic hysteresis from said first soft ferromagnetic material; annealing separately said first and said second stack; assembling said annealed first stack and said annealed second stack to obtain said magnetic flux concentrator structure.

A method for manufacturing a magnetic flux concentrator structure comprises the steps of: providing a first stack comprising a plurality of laminated layers, each of said laminated layers being of a first soft ferromagnetic material; providing a second stack comprising a plurality of laminated layers, each of said laminated layers being of a second soft ferromagnetic material having a different magnetic hysteresis from said first soft ferromagnetic material; annealing separately said first and said second stack; assembling said annealed first stack and said annealed second stack to obtain said magnetic flux concentrator structure.

The present invention relates to a thermally activatable adhesive composition for use in a method for producing a stack of metal sheets from glued together sheet metal components, the use of the adhesive composition in a method for producing a stack of metal sheets from glued together sheet metal components, the method for producing a stack of metal sheets from glued together sheet metal components, a sheet metal component coated with the adhesive composition, and a stator or rotor core containing one or more of such sheet metal components.

The present invention relates to a thermally activatable adhesive composition for use in a method for producing a stack of metal sheets from glued together sheet metal components, the use of the adhesive composition in a method for producing a stack of metal sheets from glued together sheet metal components, the method for producing a stack of metal sheets from glued together sheet metal components, a sheet metal component coated with the adhesive composition, and a stator or rotor core containing one or more of such sheet metal components.

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.

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.

An electric machine. The electric machine includes one or more face wound strips including a first strip. The one or more strips have a plurality of openings. The first strip has a plurality of turns, and an opening of a turn of the first strip overlaps an opening of an adjacent turn, to form a portion of a fluid channel of a plurality of fluid channels. The turn and the adjacent turn abut against each other at the overlapping openings.

A method and a device for connecting sheet metal parts to form lamination stacks, wherein a sheet metal strip whose top and/or bottom surface has a hardenable polymer adhesive layer is transported continuously through an application device in which a fluid that contains an activator is applied to the adhesive layer, the applied fluid is dried, the sheet metal strip that is coated with the dried activator is continuously fed to a strip accumulator, the sheet metal strip from the strip accumulator is fed to a cyclically operating cutting device in which sheet metal parts are cut from the sheet metal strip and stacked on one another, and the cut and stacked sheet metal parts are connected to one another to form lamination stacks by means of the adhesive layers that are coated with the activator. The invention also relates to the lamination stacks produced according to the method.