Daido Steel Co., Ltd.

Daido Tokushuko Kabushiki Kaisha

Junichi Esaki

Sachihiro Isogawa

Yusuke Tozawa

Yoshitomo Kajinami

Kousuke Yoshimoto

Hiroaki Yoshida

Hiroyuki Kato

Takashi Sako

Yasuhiro Matsumoto

[Problem] Provided is an injection-molded reactor which has a further reduced loss when the reactor is in operation. [Solution Means] The injection-molded reactor is configured by injection-molding a core using a compound for a core so that a coil obtained by winding a electric wire is embedded in the core without leaving any space therein, the compound being a compound obtained by adding a low-melting-point resin B that has a melting point of 150&#xb0; C. or lower to a base resin A that is a highly heat-resistant resin with a melting point of 150&#xb0; C. or higher and that accounts for most of thermoplastic resins forming a resin binder, the melting point of the low-melting-point resin B being lower than that of the base resin A, and mixing the base resin A and the low-melting-point resin B as the thermoplastic resins with a soft magnetic powder in a proportion represented by the following expression (1):&#xb7;(soft magnetic powder)+(100&#x2212;)&#xb7;((100&#x2212;)&#xb7;(base resin)+Y&#xb7;(low-melting-point resin))&#x2003;&#x2003;expression (1)

Injection-molded reactor and compound used in same

[Problem] Provided is an injection-molded reactor which has excellent heat dissipation properties and in which the internal temperature of the core can be satisfactorily inhibited from rising due to heat generation when the reactor is in operation. [Solution Means] A material for a core obtained by mixing a soft magnetic powder, a resin binder, and a thermally conductive fibrous filler having a higher thermal conductivity than the soft magnetic powder in accordance with X&#xb7;(soft magnetic powder)+Y&#xb7;(thermally conductive filler)+(100-X-Y)&#xb7;(resin binder), wherein X, indicating the proportion of the soft magnetic powder, is 83 to 96% by mass and Y, indicating the proportion of the thermally conductive filler, is 0.2 to 6.8% by mass, is used to mold a coreso that a coilobtained by winding an electric wire is embedded therein without an interval, thereby configuring a reactor

Reactor and compound used in same

[Problem] To provide a method of manufacture for an encased coil body, which is capable of easily manufacturing an encased coil body which is configured so as to be encased in a state where a coil is enclosed within an electrically insulating resin and is also capable of favorably preventing the coil from positional misalignment or deformation at the time of the manufacture. [Means for Solution] The method includes injection-molding a resin covering layer which encases the coilwith a thermoplastic resin, in which the injection-molding is carried out such that the injection-molding step is divided into a primary molding step and a secondary molding step, in which the primary molding step includes contacting a primary molding die to an inner circumferential surface of the coiland molding a primary molded body-which includes an outer circumferential covering portionin a state where the coilis constrained so as to be positioned in a radial direction, and the secondary molding step includes, after the primary molding step, setting the primary molded body-along with the coilto a secondary molding die and molding a secondary molded body which includes an inner circumferential covering portion.

Method of manufacture for encased coil body

The present invention relates to a process of producing a permanent magnet, which includes extruding a preform to form a plate-shaped permanent magnet, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction. The present invention also relates to a plate-shaped permanent magnet formed by extruding a preform, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction, whereby the permanent magnet has a strain ratio &#x3b5;/&#x3b5;with respect to the preform in a range of 0.2 to 3.5, in which &#x3b5;is a strain in the direction of the extrusion of the preform and &#x3b5;is a strain in the Y-direction.

Process of producing permanent magnet and permanent magnet

A method for manufacturing a ring-shaped magnet includes arranging, in a penetrating hole formed in a die, a mandrel having a cylinder tip portion of a diameter d, a cylinder base end portion of a diameter d, provided d&#x3c;d, and a taper portion positioned between the cylinder tip portion and the cylinder base end portion. The penetrating hole includes a first penetrating hole portion of a diameter D, a second penetrating hole portion of a diameter D, provided D&#x3c;D, and a tapered hole portion of a positioned between the first penetrating hole portion and the second penetrating hole portion. The cylinder tip portion is loaded with a preform, and plastic-working is performed on the preform in a gap formed by the penetrating hole and the mandrel by pressing the preform with a pressing punch.

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Nagoya, Japan

Junichi Esaki