Hitachi, Ltd.

Other

Nihon Kohden Corporation

Hitachi Car Engineering Co., Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Japan Servo Co.,ltd.

Nippon Telegraph and Telephone Corporation

Hitachi High-tech Corporation

Hitachi Device Engineering Co., Ltd.

Hitachi Powdered Metals Co., Ltd.

Fusion Group Holdings Co., Ltd.

Kenji Miyata

Masatsugu Nishi

Takaya Suzuki

Nobutake Konishi

Shigemi Hirasawa

Yuuichi Kijima

Masahiro Okamura

Kohji Maki

Susumu Sasaki

Takuzo Ogawa

Yoshiyuki Kaneko

Yuji Enomoto

Kazuo Hiramoto

Naoki Kobayashi

Fumio Tajima

Ryoso Masaki

Kazumasa Ito

Takashi Ishigami

Satoshi Shimada

Kazuo Tahara

Takashi Aoyama

Toshifumi Usui

Motoya Ito

Tomio Yaguchi

Takashi Naganawa

Kikuo Ono

Takashi Okada

Hiroshi Morita

Genshiro Kawachi

Takashi Doi

Takahiro Daikoku

Hiroshi Katayama

Yoshihisa Ishikawa

Junichi Hirota

Masanori Kubota

Yasuaki Motegi

Hiroshi Kawasaki

Saburo Oikawa

Yoshio Terasawa

Akio Mimura

Yoshikazu Hosokawa

Chio Ishihara

Kim Houng Joong

Susumu Murakami

Mitsuru Ura

Kenji Ono

Ryoichi Takahata

Kouki Isozaki

Jun Ishikawa

Koji Tsumaki

Tadashi Sato

Hideaki Kawakami

Tasao Soga

Fumiyuki Kobayashi

Tatsuya Kamei

Kazumasa Ide

Hiroshi Kanazawa

Shigeru Izumi

Takahiro Shimura

Kenji Tanimoto

Akiyoshi Komura

Yutaka Misawa

Miyoshi Takahashi

Masayuki Tani

Hiroyuki Watanabe

Hiroaki Hachino

Keigo Kasuya

Shoji Ohiwa

Yasutoshi Kurihara

Hideshi Fukumoto

Kouki Yamamoto

Jun-ichi Ohwada

Masayoshi Naito

Akinori Shibayama

Makoto Senoh

Soichiro Matsunaga

Masahiko Soshino

Kenichi Katagishi

Masaru Yarita

Shunji Kakiuchi

Yoshiharu Harada

Yoshiya Higuchi

Shuhei Ishikawa

Kazuo Shima

Kaoru Kawabata

Mitsuru Sudo

Daigo Komesu

Hisashi Yukita

Takekazu Ootsuka

Yoshiaki Okajima

Eimi Adachi

Kishio Arita

Keito Kito

A monitoring device includes a receiving unit, a processing unit, and an information providing unit. The receiving unit is configured to receive a first photoplethysmogram signal acquired by irradiating a body of a subject with a first light having a first wavelength, and a heartbeat signal corresponding to a heartbeat of the subject. The processing unit is configured to calculate a fundamental frequency of heart rate corresponding to a heart rate of the subject based on the heartbeat signal, and estimate a fundamental frequency of pulse rate of the subject by comparing the fundamental frequency of heart rate with a frequency component of the first photoplethysmogram signal. The information providing unit is configured to provide information acquired based on the fundamental frequency of pulse rate.

Monitoring device and physiological signal processing device

In an electron source including a suppressor electrode having an opening at one end portion thereof in a direction along a central axis and an electron emission material having a distal end protruding from the opening, the suppressor electrode further includes a receding portion receding to a position farther from the distal end of the electron emission material than the opening in the direction along the central axis at a position in an outer peripheral direction than the opening, and at least a part of the receding portion is disposed within a diameter of 2810 μm from a center of the opening. Accordingly, an electron source, an electron gun, and a charged particle beam device such as an electron microscope using the same, in which a machine difference in a device performance due to an axial shift between the electron emission material and the suppressor electrode is reduced, are implemented.

Electron source, electron gun, and charged particle beam device

In the present invention, in an electromagnetic device that uses a coil current, such as a motor, an initial value of a desired coil current waveform is inputted, a magnetic field analysis is performed for the electromagnetic device, a power supply voltage waveform which is derived from a magnetic vector potential acquired from the analysis is calculated, and a circuit coupled magnetic field analysis is performed by using a fundamental waveform component of the calculated power supply voltage waveform, thereby providing a power supply voltage waveform calculation method and a circuit coupled magnetic field analysis method for obtaining a steady solution more quickly than in the conventional technique.

Method for calculating power supply voltage waveform, method for analyzing circuit coupled magnetic field, program and recording medium recording program

Provided is a method of preparing a combustible oil, the method comprising adding and mixing: a petroleum-based combustible oil; a water having an oxidation-reduction potential of &#x2212;300 mV or lower, a pH of 9.0 or higher, and a dissolved hydrogen concentration of 0.8 ppm or higher; a fatty oil; and an activated carbon to obtain a mixture.

Method of preparing combustible oil

An alternator comprising a rotor having plural magnetic poles in the circumferential direction; and a stator whose teeth are disposed opposite to the periphery of the rotor, with an air gap interposed between the rotor and the stator, wherein the coil conductors are wound on the stator so that two stator magnetic poles may be formed by two coil units of a phase wound around stator teeth within the range of 360 electrical degrees subtended by the magnetic poles of the rotor; each of the two coil units forming the stator magnetic poles spans an electrical angle less than 180 electrical degrees; the two coil turns forming the two stator magnetic poles are laid out so that they may not overlap each other; and the coil conductors are so wound that the adjacent stator magnetic poles exhibit opposite magnetic polarities.

Electric rotating machine

A rotating electrical machine includes a rotor, in which a plurality of magnetic poles are provided in circumferential direction, and a stator, within which the rotor is disposed. In the stator, two stator magnetic poles are formed by winding coils of one phase and by a stator core of the stator within 360&#xb0; of electrical angle defined by the magnetic poles of the rotor. The coils that form respective stator magnetic poles have angular widths in circumferential direction of less than 180&#xb0; of electrical angle, the coils that form the respective two stator magnetic poles are provided so as not to mutually overlap and are wound so that adjacent ones of the stator magnetic poles have mutually opposite polarities, and, in the stator, each winding of each coil consists of an external bridge wire, a turn portion, an internal bridge wire, and a turn portion, in that order.

Rotating electrical machine

An object of the present invention is to provide a small, high-power rotating electrical machine by suitably forming a distributed winding coil such that two stator magnetic poles each formed of in-phase coil turns are arranged within an electric angle of 360 degrees formed by magnetic poles of the rotor. The present invention provides a method for manufacturing a stator, the method including a first step of placing a distributed winding coilcomposed of a wire wound around a reel, as a whole, inside a stator core, and a second step of moving an insertion bladeso as to spread the distributed winding coilin the radial direction of the stator core, thus inserting the distributed winding coilinto a stator core slot

Process of manufacturing a stator

In an apparatus for measuring an oxygen saturation in blood, a plurality of light emitters irradiate a living tissue with a plurality of light beams having different wavelengths. A light receiver receives the light beams reflected from or transmitted through the living tissue to generate pulse wave signals in accordance with pulsations of the blood in the living tissue. A separator separates each of the pulse wave signals into a plurality of amplitude signals each of which is associated with one frequency, thereby generating pairs of amplitude signals each of which is associated with one of a plurality of frequencies. A first processor calculates a ratio between the amplitude signals in each of the pairs of the amplitude signals. A selector selects one of the pairs of the amplitude signals. A second processor calculates the oxygen saturation from the ratio of the selected pair of the amplitude signals.

Apparatus and method for measuring oxygen saturation in blood

Electric motor

An electric motor comprising a rotor having plural magnetic poles in the circumferential direction; and a stator whose teeth are disposed opposite to the periphery of the rotor, with an air gap interposed between the rotor and the stator, wherein the coil conductors are wound on the stator so that two stator magnetic poles may be formed by two coil units of a phase wound around stator teeth within the range of 360 electrical degrees subtended by the magnetic poles of the rotor; each of the two coil units forming the stator magnetic poles spans an electrical angle less than 180 electrical degrees; the two coil turns forming the two stator magnetic poles are laid out so that they may not overlap each other; and the coil conductors are so wound that the adjacent stator magnetic poles exhibit opposite magnetic polarities.

A claw pole type motor includes first and second claw poles opposed to each other and each including a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pole portions arranged on the inner diameter side, and axially extended, and an outer peripheral side yoke portion extending on the outer diameter side. A stator core is provided having an inner diameter side, and is formed so as to cause the pole portions of the first claw pole to be meshed with the pole portions of the second claw pole. A rotor is arranged on the inner diameter side of the stator core with a circumferential gap being defined therebetween. In order to provide high efficiency while simplifying manufacturing, the first and second claw poles are formed by compacting of magnetic powder.

Multiple phase claw pole type motor

In a multiple phase claw pole type motor which includes: a plurality of claw poles including a claw portion extending in an axial direction and having a magnetic pole surface facing a rotor in a state of being separated from the rotor by a small gap, a radial yoke portion extending radially outwardly from this claw portion, and an outer peripheral yoke extending from this radial yoke portion in the same direction as the direction of extension of the claw portion; a stator core formed by alternately placing the claw poles in a circumferential direction so that a distal end of each claw portion faces the outer peripheral yoke of an adjacent one of the claw poles; and a stator constructed by sandwiching an annular coil with the adjacent claw poles of this stator core, a multiple phase claw pole type motor characterized in that the claw poles are formed by compacting a magnetic powder and are formed of a magnetic compact having a DC magnetizing property of its flux density becoming 1.7 teslas or more when 10000 A/m of magnetic field is applied.

An outer rotor type hybrid stepping motor including a stator, a rotor, a magnet disposed axially in either the stator or rotor, a stator core disposed inward from a gap formed between the stator and rotor, the rotor disposed outside the gap, and a stator winding wound around the stator core. The outer rotor type hybrid stepping motor has a cross-sectional area A in the axial direction of the magnet, a gap portion diameter D, a lamination thickness of the stator core in the axial direction L and a residual magnetic flux density of the magnet Br. The lamination thickness of the stator core in the axial direction L and the residual magnetic flux density Br are determined according to the equation D&#xd7;L/A=k&#xd7;Br with the condition that coefficient k is kept in a range of 0.56-0.66(1/T). The resulting optimized design parameters for L and Br provide a reduction in size of the outer rotor type hybrid stepping motor, a high output and a high resolution.

Outer rotor type hybrid stepping motor

Growing community of inventors

Hitachinaka, Japan

Kenji Miyata