Ntn Corporation

Asahi Yukizai Kogyo Co., Ltd.

Takayuki Oda

Eiichirou Shimazu

Kayo Sakai

Shinji Miyazaki

Toru Takahashi

Tatsuo Nakajima

Takuji Harano

Hiroyuki Hakamata

Isao Kai

Ikuo Uemoto

Shougo Kanbe

Hirotami Hosokawa

To provide a magnetic element such as a pot-shaped inductor in which a coil is covered by a magnetic body, having excellent cooling performance and being capable of suppressing heat generation. An inductoras the magnetic element is provided with a coil formed by winding a winding wire, a magnetic bodyin which the coilis arranged and which transmits magnetic flux generated by the coil. The magnetic bodyincludes an air-cooling portion for air-cooling the magnetic element, on a magnetic body outer diameter portion which covers an outer diameter side of the coil. The air cooling portion is formed of a slitas a hole structure penetrating the magnetic body outer diameter portion. Further, in a configuration in which the coil is sealed by a sealing resin, the magnetic body includes a flow control path, which controls a flow of the resin in filling the sealing resin, on a surface facing the coil.

Magnetic element

The present invention facilitates positioning of contact surfaces of a resin case, core gap management, and assembling processing. A resin casecan house at least one magnetic core selected from a U-shaped magnetic core, a UU-shaped magnetic core, a UR-shaped magnetic core, and an I-shaped magnetic core. The resin caseis used for an inductance element in which a coil is arranged around the magnetic core so as to house the magnetic core. The resin case is an assembly of a plurality of divided members with the same shape. A recess and a projection A, Amutually fitted complementary to each other are formed on end surfaces of the divided members contacted with each other.

Inductance element resin case and inductance element

The present invention provides a magnetic element in which iron loss-caused heat generation is restrained and which can be produced with a high productivity. The magnetic element has a magnetic body which allows a magnetic flux generated by a coil () to pass therethrough. The magnetic body is a combined body formed by combining two halves, of the magnetic body composed of the compression molded and injection molded bodies, obtained by bisection made in an axial direction of the coil with each other. A compression molded magnetic body () is disposed at a portion generating iron loss-caused heat to a high extent or a portion inferior in heat dissipation performance. An injection molded magnetic body () is disposed at a portion other than the portion where the compression molded magnetic body is disposed. The compression molded and injection molded magnetic bodies are combined with each other.

A magnetic encoder device () of the present invention includes a base portion () having a mounting surface () for mounting to a rotary shaft (), a cored bar () fitted and fixed over the base portion (), and a double-row magnetic encoder track () formed on the cored bar (). Through movement of each of magnetic poles of the magnetic encoder track () over a region opposed to a magnetic sensor (), an angle of the rotating rotary shaft is detected. The base portion () is formed of a sintered metal, and the mounting surface () is subjected to sizing.

Magnetic encoder device and rotation detection device

The invention relates to improvements of RCS and casting molds therefrom. The improvement resides that the resinous coating contains halogen-containing compound(s) which accelerate(s) carburizing of the resin during under heat subjected to the molten metal pouring step. Further, the resin coating comprises certain amount of pulverized metal capable of reacting under heat with separated halogen or halogen compound during the casting step and for avoiding ferrous element(s) in the castings and/or the mold(s).

Growing community of inventors

Aichi, Japan

Takayuki Oda