Seikosha Co., Ltd.

Mitsubishi Electric Corporation

Hitachi Power Semiconductor Device, Ltd.

Junichi Aizawa

Satoru Stephen Yamauchi

Shoichiro Kumazawa

Tomohiro Wada

Akihiro Daikoku

Atsushi Michimori

Tsuyoshi Hayakawa

Shota Hanioka

Isao Kondo

Natsuki Hashiba

Hiroaki Sugiura

Akira Nakamura

Tomohiro Sasagawa

Yoshihiro Miyama

Hideaki Arita

Eiji Niikura

Shigetoshi Ipposhi

Norihiro Watanabe

Motoaki Tamaya

Yoshikazu Nakano

Isato Watanabe

Hidekazu Kodera

Fumiaki Yamashita

Chise Nanba

Kenji Okuda

Hironobu Honda

Yukio Funahara

Provided are: a synchronous machine having permanent magnets as a field system; a stress estimator that estimates stress acting on the permanent magnets; and a first magnet temperature corrector that calculates an amount of demagnetization due to stress of armature interlinkage magnetic flux on the basis of the estimated stress, estimates an amount of demagnetization due to stress of the armature interlinkage magnetic flux on the basis of the rotor position of the synchronous machine, a current command and a voltage command, and the amount of demagnetization due to stress of the armature interlinkage magnetic flux; and outputs a permanent magnet temperature estimated value after correction, having factored therein the amount of demagnetization due to stress of the armature interlinkage magnetic flux from the estimated armature interlinkage magnetic flux.

Synchronous machine control device and permanent magnet temperature estimation method for synchronous machine

In a mechanically and electrically integrated driving apparatus, a common coolant flow channel for cooling a motor unit and an inverter unit is disposed inside a wall portion of a frame unit. Power modules are placed in close contact with an inner wall surface of the frame unit. A bracket that is separate from the frame unit is fitted into the frame unit. A space inside the frame unit is divided by the bracket into: a space in which the motor unit is housed; and a space in which the inverter unit is housed.

Mechanically and electrically integrated driving apparatus and manufacturing method therefor

A semiconductor switch circuit comprises: a first switch pair including two MOSFETs having gates connected one another and sources connected to one another, and a zener diode reversely connected between the gates and sources of the MOSFETs; a second switch pair including two MOSFETs having gates connected one another and sources connected to one another, and a zener diode reversely connected between the gates and sources of the MOSFETs; and a third switch pair comprising two MOSFETs having gates connected to one another and sources connected to one another. The first switch pair and the second switch pair are connected in series between two input/output terminals through a connecting node. The third switch pair is connected to the connecting node between the first switch pair and the second switch pair.

Semiconductor switch circuit, signal processing apparatus, and ultrasound diagnostic apparatus

To obtain a laser light source module, a copper-based material is press-fitted into a through hole formed in a stem made of an iron-based material, thereby forming a first heat sink. A mount made of a copper-based material is fixed to the first heat sink and at least one semiconductor laser device is mounted on the mount. A second heat sink is bonded to lower surfaces of the stem and the first heat sink by a thermal conductive adhesive. An upper surface of the first heat sink is located on a same plane as that of the stem, and a lower surface of the first heat sink is located higher than that of the stem.

Laser light source module

A projection apparatus includes an optical engine () that projects an image on a screen from a rear side, an engine supporting plate () on which the optical engine () is placed, an adjusting member () of a substantially wedge-shape inserted into between a base portion () and a lower surface of the engine supporting plate () so that front or rear end of the engine supporting plate () is vertically rotatable, a front-to-rear position adjusting unit () capable of moving the adjusting member () in front-to-rear direction, a slope portion () having a slope surface () that gradually increases or decreases an angle of a surface of the adjusting member () contacting the engine supporting plate () in accordance with a movement of the adjusting member (), and a fixing unit () that fixes the engine supporting plate () to an adjusted position.

Projection apparatus

An image display projector is provided so as to reduce scintillation. The image display projector comprises: an optical engine for emitting light according to an inputted imaging signal; a Fresnel lens disposed to receive the light emitted from the optical engine, for emitting the incident light as collimated one; a diffusion member, placed in front of the Fresnel lens in the light-traveling direction, for diffusing the collimated light emitted from the Fresnel lens; and a drive unit for moving either the Fresnel lens or the diffusion member, along a predetermined track (orbit), in a plane parallel to either the plane from which the collimated light or the diffused light is emitted. And then, the moving velocity of either the Fresnel lens or the diffusion member is at any moment larger than zero in any direction within the parallel plane.

Image display projector having a drive unit for moving either a Fresnel lens or a diffusion member

An insulating layer, a luminescent layer, a transparent electrode, base sheet with a transparent electrode formed thereon and a desiccant film are laminated in that order on the upper surface of a pointer body which also serves as a rear electrode. The upper surface of the dessiccant film is sealed with a moistureproof film. In producing a luminous pointer, these layers are laminated at a plurality of portions on the upper surface of a sheet which is to constitute pointer bodies, the pointer bodies are blanked along the outlines thereof by press working, and then the outside of the disiccant film is sealed with a moistureproof film. Alternatively, the outside of the desiccant film may be sealed with a moistureproof film before blanking the pointer bodies by press working.

Luminous pointer and manufacturing method thereof

A three-handed clock has a single movement to rotationally drive the second, minute and hour hands. The rotary output of the movement is transmitted directly to the second hand and is transmitted through a transmission belt to the minute and hour hands. The use of the transmission belt eliminates the need for a gear train to drive the minute and hour hands thereby providing greater design flexibility and ease of assembly and maintenance.

Three hands type clock with belt drive

Clock movement

A timepiece with mobile decorations comprises: a roof disposed over a case body having a timepiece unit built therein; driving means to make said roof up and down while turning the same in response to a signal from the said timepiece unit; and mobile decorations disposed inside of the roof to operate and become visible from the outside while the roof is in a raised position.

Timepiece with mobile decorations

A miniaturized electromagnetic bell unit suitable for use with an alarm clock and the like is provided. The bell unit of the present invention is characterized in that it is miniaturized in such a way that a yoke to which a coil and a bell hammer are attached is incorporated within a bell and the bell is fixed to the yoke. Besides the simplicity of its structure, the advantages of the present invention are that the bell hammer can be adjusted in a simple manner through a hole drilled in the bottom of the bell; both the bell and the yoke are held fixed together simply and firmly such that a positioner is inserted into holes drilled correspondingly through the bell and the yoke while at the same time, an arm integrally extending from the yoke is fixed to a fixing member; and further, another hole is drilled in the bottom of the bell and one of two electrodes is inserted into the bell thorugh the hole while the other electrode is brought into contact with the outer surface of the bell whereby the yoke and the bell are spot-welded to each other simply and securely.

Method of spot welding parts of an electromagnetic bell unit

A miniaturized electromagnetic bell unit suitable for use with an alarm clock and the like is provided. The bell unit of the present invention is characterized in that it is miniaturized in such a way that a yoke to which a coil and a bell hammer are attached is incorporated within a bell and the bell is fixed to the yoke. Besides the simplicity of its structure, the advantages of the present invention are that the bell hammer can be adjusted in a simple manner through a hole drilled in the bottom of the bell; both the bell and the yoke are held fixed together simply and firmly such that a positioner is inserted into holes drilled correspondingly through the bell and the yoke while at the same time, an arm integrally extending from the yoke is fixed to a fixing member; and further, another hole is drilled in the bottom of the bell and one of two electrodes is inserted into the bell through the hole while the other electrode is brought into contact with the outer surface of the bell whereby the yoke and the bell are spot-welded to each other simply and securely.

Electromagnetic bell unit, its fitting structure and a method of welding

Electromagnetic bell

A method of connecting a coil as mounted in an electric watch or clock in which a lead wire of the coil is made to cross a conductor near the terminal portion of the coil. The lead wire is drawn so as to traverse beyond a conductor to which it is to be attached, and the lead wire is anchored by an anchoring device so as to hold it against the conductor. The lead wire is then bonded to the conductor at the point of traverse.

Growing community of inventors

Tokyo, Japan

Junichi Aizawa