Hitachi, Ltd.

Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Proterial, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Mamoru Kimura

Teruyuki Hiyoshi

Tetsuo Fujigaki

Daisuke Kori

Noboru Nitta

Kazumasa Ide

Hiroyuki Mikami

Shunichi Ono

Tomohisa Yoshimaru

Akiyoshi Komura

Motonobu Iizuka

Kazuhiko Takahashi

Motoo Futami

Masaya Ichinose

Kazuhiro Imaie

Akihito Nakahara

Seikichi Masuda

Haruo Koharagi

Masahiro Hori

Miyoshi Takahashi

Kazuo Nishihama

Yasushi Iwai

Yoshihiro Yasui

Youichi Matsumoto

Shuji Mizutani

Motonobu Iiduka

Masayasu Fujieda

Noriaki Hino

Toshio Abe

Satoshi Kikuchi

Motoki Ohta

Masanori Matsumoto

Shinji Sugimoto

Shuji Aizawa

Masaaki Endo

Akitomi Semba

Tomomichi Ito

Takayuki Koizumi

Masatoshi Yoshimura

Masanori Sawahata

Shunsuke Otake

Nobuhiro Kusuno

Daisuke Satou

Daichi Kawamura

Ai Nagano

Shogo Serita

Eiichirou Tokizaki

Masatoshi Koike

Hirohisa Sano

Kyohei Aimuta

Nobuhiko Obata

The stator for a rotating electrical machine includes an annular first iron core part, which is a stacked body including electrical steel plates, and second iron core part, which is a stacked body including an amorphous soft magnetic metal or a nanocrystalline soft magnetic metal, wherein: the annular first iron core part includes a plurality of tooth parts which protrude toward the inner circumferential side and around which a coil is wound, and first groove parts formed within each tooth part from an outer circumferential surface; and the second iron core parts are disposed in the first groove parts.

Stator for rotating electrical machine, rotating electrical machine, method for manufacturing stator for rotating electrical machine, and method for manufacturing rotating electrical machine

A permanent magnet electrical rotating machine is provided which is capable of contributing to protected permanent magnets and increased cooling performance during operation. The permanent magnet electrical rotating machine includes: permanent magnets; rotor cores that have the permanent magnets mounted thereto and are laminated in a rotating axis direction; spacers that are placed between adjacent rotor cores; and permanent magnet protection members that are installed between the permanent magnets and the rotor cores and also placed to maintain radial continuity in space partitioned by the spacers between the rotor cores.

Permanent magnet electrical rotating machine with protection members arranged between permanent magnets and rotor cores

There are provided a voltage command calculator that calculates a voltage command value that is a command value of an AC voltage to be applied to a rotary electric machine that is driven by a power conversion device, a carrier wave generator that generates a carrier wave, a comparator that generates a pulse signal to be supplied to the power conversion device on the basis of a comparison result between the voltage command value and the carrier wave, and a reset signal receiving unit that changes a value of the carrier wave into a predetermined value when a predetermined reset signal is input.

Control device for power conversion device, compressor drive system, flywheel power generating system, and control method of power conversion device

In a permanent magnet rotating electrical machine including a stator, a rotor obtained by stacking a plurality of rotor cores arranged with magnet insertion holes in layers with gaps, and permanent magnets inserted to the magnet insertion holes, the magnet insertion holes are formed on both sides of the duct piece so as to depart from the duct piece disposed between the rotor cores as the magnet insertion holes extend from the side of the center of the rotor core to the outer circumference side, the magnet insertion holes are disposed so as to shift from the duct piece in the circumferential direction of the rotor, and inner circumference side voids having the length in the circumferential direction wider than the thickness in the circumferential direction of the permanent magnets are provided from the inner circumference side ends of the permanent magnets toward the duct piece.

Permanent magnet rotating electrical machine

In accordance with an embodiment, an inkjet head comprises an ejection section and a driving section. The ejection section ejects ink according to the operations of an actuator. In order to make the ejection section eject different amount of ink for different drops, the driving section applies voltage to the actuator of the ejection section such that the ejection section ejects ink continuously based on the printing data indicating the times the ejection section ejects ink and a position flag designating a drop frame number where ink starting to be ejected.

Inkjet head and ink jet printing apparatus using the head

According to an embodiment, an ink jet head includes a discharge unit, a first storing unit, a second storing unit, a waveform generating unit, and a voltage applying unit. The discharge unit discharges ink according to the operation of an actuator. The first storing unit stores a pattern of a voltage to be applied to the actuator. The second storing unit stores a plurality of timer sets. The waveform generating unit generates, on the basis of the timer sets stored by the second storing unit and the voltage pattern stored by the first storing unit, a waveform of the voltage to be applied to the actuator. The voltage applying unit applies the voltage to the actuator on the basis of the waveform generated by the waveform generating unit.

Ink jet head and printing apparatus

An electrical rotating machine system that can be easily maintained and can provide improved power generation efficiency. The electrical rotating machine system includes: a first electrical rotating machine having a first stator that has first stator windings, and a first rotor that has first rotor windings and is disposed on the internal diameter side of the first stator so as to have a gap between the internal diameter side of the first stator and the first rotor itself; a second electrical rotating machine having a second stator that has second stator windings, and a second rotor that has second rotor windings and is disposed on the internal diameter side of the second stator so as to have a gap between the internal diameter side of the second stator and the second rotor itself; and at least one power converter that is electrically connected to the first rotor windings and the second rotor windings, and configured to rotate when the first rotor rotates.

Electrical rotating machine system or wind turbine system

A rotary electric machine according to the present invention includes a stator including a stator core and stator coils, a rotor provided rotatably with a gap to the stator, a housing that stores the stator and the rotor, a fan that circulates air inside the housing through the gap in the housing, a heat exchanger that cools the air circulated by the fan, and an air guiding plate including an air guiding route formed therein for guiding the air cooled by the heat exchanger such that the cooled air flows into the gap without coming into contact with the stator coils.

Rotary electric machine

A driving device of an ink jet head including a plurality of ejection channels, including a plurality of driving waveform generation portions that are provided which respectively correspond to the plurality of ejection channels, a random number generation portion that generates a random number, and a connection portion. The driving waveform generation portions receive printing data and correction data, generate a driving signal of the ejection channels on the basis of the received printing data, correct a waveform of the driving signal by using the received correction data, and then output the corrected waveform to the correction data and to the corresponding ejection channels. The connection portion connects the random number generation portion of the driving waveform generation portions such that a random number is supplied to each of the driving waveform generation portions as correction data having a value independent for each of the driving waveform generation portions.

Ink jet head driving device

An electrical rotating machine includes: a rotating shaft; a rotor, equipped with permanent magnets, and formed to rotate with the rotating shaft, a stator disposed in opposition on an outside-diametral side and via a clearance with respect to the rotor; and anti-demagnetization conductors extending in the axial direction of the shaft, the conductors each being disposed inside the rotor, wherein: the anti-demagnetization conductors are provided in pairs of two for each of magnetic poles of the rotor; the two anti-demagnetization conductors forming a pair are electrically interconnected; and, inside the rotor, the two paired anti-demagnetization conductors are disposed at different-polarity sides of two corresponding permanent magnets in a circumferential direction of the rotor, the different-polarity sides each being more adjacent to the circumferential direction of the rotor than to an end portion of one of the two corresponding permanent magnets existing close to each other in one magnetic pole.

Electrical rotating machine

There is provided a controller which sets electrodes which are respectively disposed on wall surfaces of a plurality of ink chambers which are arranged in parallel so as to be separated from each other by partitions made of a piezoelectric material, to a high impedance state. In addition, at a timing when an identical potential is applied to the electrodes of at least three ink chambers which are arranged in parallel so as to be separated from each other by mutually adjacent partitions, the controller sets electrodes of ink chambers other than ink chambers located on both sides to a high impedance state.

Driving device and driving method of inkjet head

A drive device includes a circuit for selecting an arbitrary voltage among a plurality of kinds of voltages required for generating a drive signal for variably controlling potential applied to electrodes of channels. In the drive device, respective drive voltage input terminals and output terminals are respectively connected by a low-impedance connecting circuit which has low internal resistance, and a selected voltage input terminal and the output terminals are connected by a high-impedance connecting circuit which has high internal resistance. The drive device controls a drive waveform transition pattern of a drive signal such that the drive signal is output via the high-impedance connecting circuit while the potential applied to the respective electrode simultaneously changes in the same direction out of a positive direction and a negative direction and that the drive signal is output via the low-impedance connecting circuit in the other cases.

Ink-jet head drive device

According to one embodiment, a driving device applies an ejection pulse signal that deforms a partition in such a way that an ink drop is ejected from a nozzle and an auxiliary pulse signal that deforms the partition to such an extent that an ink drop is not ejected from the nozzle, as a drive signal for providing a potential difference between electrodes, to an inkjet head at different timings so that the two pulse signals are not applied simultaneously. A constraint on output of the auxiliary pulse signal is significantly relaxed.

Inkjet head driving method and driving device

A pulse generator forms, from setting data respectively stored in an ejection relevant waveform setting register and a first high impedance setting register, an ejection relevant driving pulse for setting an electrode of an ink chamber communicating with an ejection relevant nozzle to a high impedance state for a predetermined period. The pulse generator forms, from setting data respectively stored in an ejection both-side waveform setting register and a second high impedance setting register, an ejection both-side driving pulse for setting electrodes of ink chambers communicating with ejection both-side nozzles to the high impedance state for the predetermined period. The pulse generator outputs signals of the formed driving pulses to an inkjet head.

Pulse generator

According to one embodiment, an inkjet head driving device includes a load-voltage generating circuit and a plurality of channel driving circuits provided to respectively correspond to a plurality of channels of an inkjet head. The load-voltage generating circuit selects any one voltage out of a reference voltage and a driving voltage having potential other than the reference voltage and outputs the voltage. Each of the channel driving circuits includes a first input terminal, a second input terminal, a third input terminal, an output terminal, a series circuit, and a parallel circuit.

Inkjet head driving device

Growing community of inventors

Hitachi, Japan

Mamoru Kimura