Tdk Corporation

Toshihiro Kuroshima

Toshio Tomonari

Hiroshi Suzuki

Koji Mitake

Katsumi Kobayashi

Katsumi Saito

Takeshi Masuda

Tomokazu Ito

Noritaka Chiyo

Taeko Tsubokura

Kouki Sato

Yoshinori Sasaki

Masaru Yaguchi

Akira Sato

Setu Tsuchida

Sunao Masuda

Hirohumi Asou

Takeshi Okumura

Makoto Maeda

Katsuyuki Suzuki

Nobuyuki Shimbo

Sumio Takahashi

Kouzou Kajiwara

Setu Tuchida

Eizou Hara

Yuichiro Igarashi

A magnet structure includes a first sintered magnet, a second sintered magnet, and an intermediate layer disposed between the first sintered magnet and the second sintered magnet. Each of the first sintered magnet and the second sintered magnet independently includes crystal grains containing a rare earth element, a transition metal element, and boron. The intermediate layer contains rare earth element oxide phases and crystal grains containing a rare earth element, transition metal element, and boron. Each of the transition metal elements independently includes Fe or a combination of Fe and Co. An average coverage factor of the rare earth element oxide phases measured on the basis of a cross section perpendicular to the intermediate layer of the magnet structure is within a range of 10% to 69%.

Magnet structure

A magnet temperature information output device is disposed on a rotating electrical machine including a stator and a rotor with a permanent magnet, and is arranged to output temperature information regarding a temperature of the permanent magnet. The magnet temperature information output device includes an element arranged to detect a magnetic flux and output an electrical signal responding to the detected magnetic flux as the temperature information. The element is disposed on the stator.

Magnet temperature information output device and rotating electrical machine

A rotating electrical machine includes a stator, a rotor with a permanent magnet, a first number of one or more first coils, and a second number of one or more second coils. The second number is different from the first number. The one or more first coils are disposed on the stator. The one or more second coils are disposed on the rotor. The one or more first coils and the one or more second coils are disposed on the stator and the rotor, respectively, in such a manner as to closely oppose each other in a state where the rotor is at a predetermined rotation angle position. The one or more first coils are arranged to induce a voltage in response to a relative position with respect to the one or more second coils.

Rotation position detection device for a rotating electrical machine

The present invention provides a magnet structure comprising a first magnet, a second magnet, and an intermediate layer joining the first magnet and the second magnet. In the magnet structure, each of the first magnet and the second magnet is a permanent magnet comprising a rare earth element R, a transition metal element T, and boron B. In addition, the rare earth element R comprises: a light rare earth element Rcomprising at least Nd; and a heavy rare earth element R, and the transition metal element T comprises Fe, Co, and Cu. Further, the intermediate layer comprises: an Roxide phase comprising an oxide of the light rare earth element R; and an R&#x2014;Co&#x2014;Cu phase comprising the light rare element R, Co, and Cu.

In an IPM motor, since a first portion which is a pressed powder compact made of soft magnetic powder and has a lower magnetic permeability and a lower saturation magnetic flux density than those of a main body portion made of a laminated steel sheet is replaced and disposed in the vicinity of an inner arc side portion of a right end portion of a permanent magnet, local demagnetization is prevented.

Rotating electrical machine

A magnetism suppressing sheet is provided with a metallic foil formed by plating and a magnetic film formed by applying magnetic metal powder-containing resin paste to one main surface of the metallic foil. A manufacturing method of a magnetism suppressing sheet includes the steps of preparing a support film on which a metallic foil has been formed, and forming a magnetic film by applying a magnetic metal powder-containing paste to one main surface of the metallic foil.

Magnetism suppressing sheet and manufacturing method thereof

An external terminalcomprises a terminal electrode connection partconnected to the terminal electrodeto face to the end surface of the element body; a mounting connection partconnectable to a mounting surface; and a joint partwhich joins the terminal electrode connection partwith the mounting connection partto separate one side surfaceof the element bodyclosest to the mounting surfacetherefrom. A width Wof the joint partalong a direction parallel to the mounting surfaceis smaller than a width Wof the terminal electrode connection part

Electronic device comprising chip component and external terminal

A balun transformer includes: a drum-shaped core having a core unit and a pair of flanges arranged on both sides of the core unit; a plurality of terminal electrodes arranged on the flanges; a primary winding wound around the core unit, both ends of the primary winding being connected to the terminal electrodes; and a secondary winding wound around the core unit, both ends and a center tap of the secondary winding being connected to the terminal electrodes, wherein the secondary winding includes a first wire extending from one end to the center tap, and a second wire extending from the other end to the center tap, and the first wire and the second wire are wound around the core unit so as to extend along each other.

Balun transformer using a drum-shaped core

A noise filter available for various cable widths and capable of being easily attached to a cable. The noise filter has a first core having both ends to which first and second holding members and are attached, and a second core having both ends to which third and fourth holding members and are attached. First and second contacting portions and are formed on a first facing surface at the first core. Third and fourth contacting portions are formed on a second facing surface at the second core. When the first and second contacting portions are brought into contact with the third and fourth contacting portions an insertion hole is provided between the first and second contacting portions and between the first and second facing surfaces. The first and third holding members are coupled to each other by a retaining portion and retaining projection. The second and fourth holding members and are coupled to each other by a hinge portion.

Noise filter having a pair of cores and four core holding members

A signal transmission circuit has first to fourth inductors, and first and second varistors. The first and second inductors are magnetically coupled to each other. The first varistor is connected to ground and located posterior to the first inductor and is electrically connected to the first inductor. The third inductor is located between the first inductor and the first varistor and is electrically connected to the first inductor. The second varistor is connected to ground and located posterior to the second inductor and is electrically connected to the second inductor. The fourth inductor is located between the second inductor and the second varistor and is electrically connected to the second inductor.

Signal transmission circuit, electronic device, cable, and connector

A common mode choke coil has a first coil element and a second coil element. The first coil element is configured of a first coil pattern and a second coil pattern. Each of the first and second coil patterns has two ends and is spiral-shaped therebetween. The spirals of the two patterns are wound in the same direction. The second coil element has a shape identical to the first coil element and includes a third coil pattern corresponding to the first coil pattern and a fourth coil pattern corresponding to the second coil pattern.

Common mode choke coil

A signal transmission circuit having a characteristic impedance includes a common mode filter, a first capacitive element, a first connection line, a second capacitive element and a second connection line. The first capacitive element has a first terminal. The first connection line connects one output of the common mode filter to the first capacitive element. The second connection line connects the other output of the common mode filter to the second capacitive element. The first connection line has a first length. The second connection line has a second length. Each of the first length and the second length is within a predetermined range to change the characteristic impedance.

Signal transmission circuit

A coil assembly for reducing variations in characteristic impedance includes a winding section having a first surface and a second surface on the opposite side of the winding section from the first surface, a plurality of first protrusions provided on the first surface, and a plurality of second protrusions provided on the second surface. These protrusions are identical in shape to each other and are arrayed linearly on their respective surfaces so that the first protrusions are offset from the second protrusions. Two conducting wires are wound between neighboring protrusions such that one wire contacts one of the neighboring protrusions, while the other wire contacts the other neighboring protrusion.

Coil assembly including common-mode choke coil

A common-mode choke coil has first and second coil parts, a first inductance part, and a second inductance part. The first coil part and the second coil part are magnetically coupled to each other. The first inductance part is electrically connected in series to the first coil part and is not substantially magnetically coupled to the first coil part. The second inductance part is electrically connected in series to the second coil part and is not substantially magnetically coupled to the second coil part. The first inductance part and the second inductance part are not substantially magnetically coupled to each other.

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Tokyo, Japan

Toshihiro Kuroshima