Ibaraki, Japan
Ibaraki, Japan

Hitachi, Ltd. is a Japanese multinational conglomerate company headquartered in Chiyoda, Tokyo, Japan. It is the parent of the Hitachi Group and forms part of the DKB Group of companies. Hitachi is a highly diversified company that operates eleven business segments: Information & Telecommunication Systems, Social Infrastructure, High Functional Materials & Components, Financial Services, Power Systems, Electronic Systems & Equipment, Automotive Systems, Railway & Urban Systems, Digital Media & Consumer Products, Construction Machinery and Other Components & Systems.Hitachi is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 and TOPIX indices. It is ranked 38th in the 2012 Fortune Global 500 and 129th in the 2012 Forbes Global 2000. On January 21, 2014, numerous tech articles around the globe published findings from the cloud storage provider Backblaze that Hitachi hard disks are the most reliable among prominent hard disk manufactures. Wikipedia.


Time filter

Source Type

The present invention provides a switching device (100) for power conversion in which a first gate electrode (6), a p-type channel layer (2) having an n-type emitter region (3), a second gate electrode (13), and a p-type floating layer (15) are repeatedly arranged in order on the surface side of an n^()type semiconductor substrate (1). An interval a between the two gates (6, 13) that sandwich the p-type channel layer (2) is configured to be smaller than an interval b between the two gates (13, 6) that sandwich the p-type floating layer (15). The first gate electrode (6) and the second gate electrode (13) are both supplied with drive signals having a time difference in drive timing.


Patent
Hitachi Ltd. | Date: 2017-05-17

Provided herein is a welding mask apparatus that suppresses formation of a gap between two electrode columns and mask plates even if the electrode columns are not completely assembled. Mask holding mechanisms 36, 38 each include a moving mechanism and a displacement allowing mechanism. The moving mechanism is operable to move mask plates 32, 34 in the Y direction. The displacement allowing mechanism is operable to hold the mask plates 32, 34 to be displaceable in the X direction. Even if the electrode columns 14, 16 are assembled, being shifted in the X direction, the mask plates 32, 34 are displaced in the X direction so that the electrode columns 14, 16 can be completely fitted in recessed portions formed in the mask plates 32, 34. A gap into which molten metal would fall down is not formed between the outer periphery of each electrode column and the corresponding mask plate.


Patent
Hitachi Ltd. | Date: 2017-05-17

A battery controlling device includes: a voltage detecting unit configured to detect a closed-circuit voltage of a secondary battery; an open-circuit-voltage computing unit configured to compute an open-circuit voltage of the secondary battery; and an assembled-battery controlling unit configured to discriminate whether a computed value computed based on a voltage difference between the closed-circuit voltage and the open-circuit voltage of the secondary battery in a continuous predetermined period is exceeding a permissible value determined in advance or not. If the computed value is exceeding the permissible value determined in advance, the assembled-battery controlling unit outputs a signal that carries out charge/discharge restriction of the secondary battery.


[Task] There is a problem in that a nozzle pressure control is performed with high accuracy in a coating weight control requiring nozzle opening and closing near a welding point 411. [Solving means] A tracking unit 102 which determines whether or not it is the stable condition, by determining whether or not a coating weight acquired from a steel coating plant 2 is a coating weight based on a current nozzle pressure, a nozzle gap, and a strip speed, based on positional information of a strip 401 based on a movement distance of the strip 401, a preset control unit 101 which calculates a preset value for controlling the nozzle 211 based on a stable coating weight, a stable strip speed, and a stable nozzle gap at a timing of determining whether or not it is the stable condition, and an addition output unit 106 which outputs a control signal of the nozzle 211 based on the preset value, are included.


Patent
Hitachi Ltd. and Tokyo Institute of Technology | Date: 2017-05-17

Provided herein are an austenite steel that satisfies desirable strength and desirable castability at the same time, and an austenite steel casting using same. The austenite steel according to an embodiment of the present invention contains Ni: 25 to 50%, Nb: 3.8 to 6.0%, B: 0.001 to 0.05%, Cr: 12 to 25%, Ti: 1.6% or less, Mo: 4.8% or less, and W: 5.2% or less in mass%, and the balance Fe and unavoidable impurities, wherein the parameter Ps represented by the following formula (1) satisfies Ps 38,


A method for constructing an offshore wind turbine includes: attaching all or a part of electrical products to a tower 7 on land; stowing, on a work platform 200, the tower 7 to which the electrical product is attached; and disposing, on a foundation 10, the tower 7, to which the electric product is attached, by using a crane 201 of the work platform 200 in the sea. In addition, the electrical products are classified into special high-voltage devices and the other electrical products, the special high-voltage devices are modularized on land, the other electrical products are attached to the tower 7 on land, and the modularized special high-voltage devices and the tower 7, to which the other electrical products are attached, are disposed on the foundation 10 by using the crane 201 of the work platform 200 in the sea.


Patent
Hitachi Ltd. | Date: 2017-05-17

An aspect of the present invention includes, when controlling a driving force of an electric motor configured to provide a driving force to a wheel and a braking force of a hydraulic braking device configured to provide a braking force to the wheel, reducing the driving force according to a drivers brake operation state and also adjusting the braking force according to this driving force if a drivers brake operation is detected, and generating the braking force according to the brake operation state if a sudden braking state is detected.


Provided are a cathode material for lithium ion secondary battery having excellent rate characteristics and cycle characteristics while a cathode active substance has high density , and a lithium ion secondary battery cathode and a lithium ion secondary battery that use the above cathode material. The cathode material for lithium ion secondary battery (1), represented by Li_(1+x)M1_(1-x-y)M2_(y)O_(2) [where -0.1 x 0.3, 0 y 0.1; M1 is Ni, Co, Mn; and M2 is Mg, Al, Ti, Zr, Mo, Nb, Fe, B], is an agglomerate including secondary particles (50, 60) both formed via aggregation of lithium metal composite oxide primary particles (10) having a layered structure. The secondary particles (50, 60) have D10 in the range from 0.5 m to 10 m, and simultaneously D90 in the range of more than 10 m and equal to 50 m or less, when analyzed in the laser diffraction/scattering particle size distribution measurement. A mean porosity of the secondary particles having a particle size of more than 10 m and equal to 50 m or less is higher than that of the secondary particles having a particle size of 0.5 m to 10 m.


Patent
Hitachi Ltd. | Date: 2017-02-01

This combined cycle gas turbine plant has a gas turbine (104) and a steam turbine (106) mounted on the same shaft. A control system is configured for switching the plant from a rated mode of operation, in which the plant is operated on gas turbine output and steam turbine output, to a reduced load mode of operation, in which the plant is operated on gas turbine output alone. The switch from the rated mode of operation to the reduced load mode of operation occurs if plant demand decreases below a predetermined threshold. The steam turbine is run under full speed no load conditions in the reduced load mode of operation, and is heated using controlled steam admission, to maintain the steam turbine in a heated stand-by state.


The present disclosure provides new materials that combine the advantages of well-defined polymeric starting materials and the convenience of surface modification by physical methods into one package and, thus, offers a general and powerful platform suitable for use in numerous applications.

Loading Hitachi Ltd. collaborators
Loading Hitachi Ltd. collaborators