A method of manufacturing a thin film inductor includes preparing a carrier film having a first surface on which a first upper separation layer is formed and a second surface on which a first lower separation layer is formed. A first upper layer, including a first upper coil pattern and a first upper insulating pattern, is formed on the first surface. A first lower layer, including a first lower coil pattern and a first lower insulating pattern, is formed on the second surface. A surface of the first upper layer is ground. A height of the first lower coil pattern is smaller than that of the first lower insulating pattern.

An iron core (1, 11, 31) for a stationary induction apparatus according to one embodiment is configured by laminating a plurality of electromagnetic steel plates (5, 16, 33). The electromagnetic steel plates are laminated so that joint parts (6, 17, 18, 32), at which the end portions of the electromagnetic steel plates abut one another, are disposed in a staggered manner; and the electromagnetic steel plates are provided with a magnetic domain fine differentiation processed part (7, 19, 34), which is located on the portion, of a surface of the end portion of each of the electromagnetic steel plates, lapped with the joint part of another electromagnetic steel plate, and which has been subjected to warping-derived magnetic domain fine differentiation.

A flux collection element of a collector unit of a magnetic position sensor and a method of producing the flux collection element, wherein the flux collection element comprises a first collection zone in a first plane and a second collection zone in a second plane, and wherein there is a connection between the first collection zone and the second collection zone via a magnetically conductive connection portion between a first attachment edge of the first collection zone and a second attachment edge of the second collection zone. In particular so that the flux collection element can thus be handled as a bulk product, the connection between the first collection zone and the second collection zone is mechanically stiffened, in particular by the introduction of a bead to be used in an electromechanical steering system in which a torque acting on a steering shaft of the steering system is detected by means of such a magnetic position sensor.

A resist coating for etching use which enables high speed and high accuracy patterning is provided by applying, to a steel strip, a negative resist ink which solidifies upon exposure to light; drying the ink to form a resist coating; then irradiating the steel strip with light while moving a mask member in synchronization with a traveling speed of the steel strip, the mask member being configured to cover a surface of the resist coating to block light, to thereby solidify a portion of the resist coating not covered with the mask member to form a solidified portion; and removing an unsolidified portion other than the solidified portion with a developing solution. Subsequently, by dissolving and removing by etching a portion of the steel strip below the removed portion of the resist coating, a fine and uniform linear groove can be formed in a surface of the steel strip.

Various embodiments include a method for producing an electrical steel sheet comprising the following steps: placing a green body comprising a first material on a substrate; structuring a surface of the green body; and thermally treating the green body.

Cores for electromagnetic devices are discussed. In one example, a core comprises three arc-shaped limbs. Each limb has a first end and a second end, and is arranged around a central axis. The first ends of the limbs are mutually connected at a first position along the central axis, and the second end of the limbs are mutually connected at a second position along the central axis. Each limb comprises a plurality of bent electrical steel strips. Methods for manufacturing such cores are also discussed.

Disclosed herein is a bonded type laminated-core member manufacturing apparatus comprising an adhesive applying unit which is selectively open for applying an adhesive to a material being continuously transferred, and a blanking unit sequentially forming laminar members having a predetermined shape by blanking the material, wherein the adhesive applying unit includes an adhesive applicator having an outlet channel for discharging the adhesive, and a valve closing the outlet channel and opening the outlet channel for discharging the adhesive when the material and the outlet channel come close to each other. since an outlet of a nozzle is opened only when a material approaches an adhesive applying unit and close when the material separates from the adhesive applying unit, leakage of the adhesive prevent can be prevented and the discharge time and the application amount of the adhesive may be regularly controlled.

A method for manufacturing a separable electromagnetic inductive apparatus is provided. The method for manufacturing a separable electromagnetic inductive apparatus comprises a winding step for winding a steel plate composed of a rolled amorphous magnetic alloy to a circular shape to form a magnetic core; a heat treating and an impregnating step for heat treating and impregnating the wound magnetic core without adding cobalt; a cutting step for cutting the heat treated and impregnated magnetic core to an orthogonal direction to the wound direction of the magnetic core; and a polishing step for polishing the cut surface having a three-dimensional plane of the cut surface of the magnetic core evenly arranged in a fixed state.

A wound iron core according to an embodiment of the present invention is provided with an iron core main body part around which a plurality of iron core materials are wound, and a window part formed at the center of the iron core main body part. The iron core materials each have a cut part at least at one location per winding. The cut parts are disposed so as to be dispersed in the periphery of the window part.

Disclosed herein is a bonded-type laminated core member manufacturing apparatus comprising an adhesive application unit to apply an adhesive to a material being continuously transferred, and a laminating unit to integrate laminar members laminated within a laminating hole by blanking the material, a laminated core member being manufactured by interlayer adhesion between the laminar members, wherein the laminating unit includes a high-frequency heater to harden the adhesive located between the laminar members, the high-frequency heater including a coil wound on the circumference of a hardening hole which accommodates the laminar members and forming a passage of high-frequency current. In accordance with the present invention, the adhesive is rapidly hardened by high-frequency induction heating and thus the integration time of the laminated core member is shortened, and accuracy of the laminating unit, which integrates the laminar members, i.e., straightness of the laminating hole to pass the laminar members, is stably maintained and, thus, misalignment of the laminated core members is prevented and management of product quality is facilitated.