A method for manufacturing a laminated iron core includes providing a plurality of annular iron core piece rows, each of which is configured by annularly arranging a plurality of divided iron core pieces including yokes and teeth, and the yokes of the annularly-adjacent divided iron core pieces in the annular iron core piece row are mutually different in shape. In the method, the annular iron core piece rows are laminated by changing a rotational angle of the newly laminated annular iron core piece row relatively to the lastly laminated annular iron core piece row laminated so that the divided iron core piece with a shape different from that of the divided iron core piece is laminated on the lastly laminated divided iron core piece.

In a method for manufacturing lamination stacks of controlled height in a tool, starting material is provided as continuous strip delivered from a coil or as an individual sheet. Laminations are punched from the starting material in several punching steps to a required contour of the laminations. A heat-curing adhesive is applied onto the laminations prior to performing a last punching step. The laminations are combined to a lamination stack. The laminations of the lamination stack are partially or completely heated in a lamination storage. The adhesive is liquefied by heating the lamination stack to build up adhesion and then solidified. Curing the adhesive at the liquefying temperature or solidifying the adhesive in the tool by cooling and subsequently heating the adhesive to a temperature below the liquefying temperature is possible so that the adhesive does not melt but undergoes further curing resulting in higher temperature stability.

A metal laminate includes a lamination of a first metal plate and a second metal plate. The first metal plate includes a caulking that exhibits a mountain shape protruding from a back surface side and recessed on a front surface side, and the second metal plate includes an accommodating portion configured to accommodate the caulking such that the caulking is fitted to the accommodating portion. The caulking includes a recessed portion provided on an inner concave surface of the caulking and recessed toward the back surface side of the first metal plate, and an abutting portion provided on an outer convex surface of the caulking and abutted against an inner surface of the accommodating portion at a position corresponding to the recessed portion. The abutting portion expands laterally from the outer convex surface toward the inner surface of the accommodating portion.

A punch processing method for a laminated iron core includes sequentially feeding the steel sheets to a mold; and performing a plurality of processes in the mold, the plurality of processes includes fixing the steel sheets being stacked to each other at a first fixing part that is positioned outside a closed curved line corresponding to an outermost periphery of the laminated iron core and a second fixing part that is positioned in a portion that finally serves as the laminated iron core; and performing punch processing on the outermost periphery of the laminated iron core while the steel sheets are stacked.

A magnetic substrate has such a shape that ridges extending between principal surfaces are cut away by cutout portions. A multilayer body has corners arranged so as to overlap the cutout portions. A coil includes lead portions which are connected with both ends of a coil portion and which are drawn out to the corners. A coil is combined with the coil to constitute a common mode choke coil and includes lead portions which are connected with both ends of a coil portion and which are drawn out to the corners. Connecting portions connect external electrodes to the lead portions and are provided at the cutout portion.

In a method for producing stacks of laminations, in which at least one adhesive is applied onto annular laminations with at least one application head and laminations are stacked into a stack of laminations, the lamination is rotated about its axis in the application area of the application head and/or the application head is moved about the axis of the lamination in order to apply the adhesive onto the lamination. A system for carrying out the method features at least one punching tool, with which laminations are punched out of a sheet metal material, wherein at least one station for cleaning and/or for activating and/or for applying an adhesive onto the laminations is arranged downstream of the punching tool.

A yokeless stator for an axial flux machine, comprising a housing, the housing comprising a circumferential portion and a plurality of elongated portions extending radially inwards therefrom, and a plurality of discrete stator teeth arranged within the circumferential portion, each discrete stator tooth comprising a ferromagnetic material and an electrical winding; the housing further comprising an electrically isolating filling material filling empty space inside the housing. The circumferential portion of the housing is made of a first non-ferromagnetic material and the elongated portions are made of a second non-ferromagnetic material. The housing comprises a laminated structure, which comprises at least part of the plurality of inwardly directed elongated portions.

In a method for manufacturing lamination stacks of controlled height in a tool, starting material is provided as continuous strip delivered from a coil or as an individual sheet. Laminations are punched from the starting material in several punching steps to a required contour of the laminations. A heat-curing adhesive is applied onto the laminations prior to performing a last punching step. The laminations are combined to a lamination stack. The laminations of the lamination stack are partially or completely heated in a lamination storage. The adhesive is liquefied by heating the lamination stack to build up adhesion and then solidified. Curing the adhesive at the liquefying temperature or solidifying the adhesive in the tool by cooling and subsequently heating the adhesive to a temperature below the liquefying temperature is possible so that the adhesive does not melt but undergoes further curing resulting in higher temperature stability.

A method of manufacturing a laminated iron core includes: inserting a plurality of electrical steel strips in a superposed state to feed rolls including a pair of upper and lower feed rolls that are driven by a drive device to feed the electrical steel strips in a superposed state into a die having a plurality of punching processes in sequence; joining a part or all of the superposed electrical steel strips together before entering the die or at an upstream stage portion of the die after feeding out the electrical steel strips from the pair of upper and lower feed rolls; and punching simultaneously the plurality of electrical steel strips in a superposed state in the die.

A method of manufacturing a laminated core includes supplying a stator material to a punching device and obtaining an electromagnetic steel plate corresponding to a rectangular processed body by punching the stator material. To obtain the electromagnetic steel plate ES, a slit is formed outside a processed body forming area in the stator material along a long side of the processed body forming area, and a center portion of the processed body forming area is punched out in a circular shape. Additionally, the processed body forming area is punched out after the slit is formed and the center portion is punched out. The laminated core is obtained by laminating and fastening a plurality of the electromagnetic steel plates.