公开(公告)号：US20190324428A1

公开(公告)日：2019-10-24

申请号：US16382900

申请日：2019-04-12

Applicant: HITACHI, LTD.

Inventor： Hideo SAKAI ,  Masaaki MAEDA ,  Yuichi SAKURAI ,  Masayoshi TAKAHASHI

IPC: G05B19/418 ,  G05B19/18

Abstract: A state identification device includes: a feature amount extraction unit that extracts a feature amount from physical data of a machine tool unit which shifts to a plurality of operation states; a feature amount storage unit in which a region is provided as a storage destination of the extracted feature amount for each of the plurality of operation states to which the machine tool unit shifts; a similarity calculation unit that calculates a similarity between the extracted feature amount and a feature amount stored in the feature amount storage unit; a state determination unit that determines an operation state of the machine tool unit based on the calculated similarity; and a storage destination determination unit that determines the region serving as the storage destination of the extracted feature amount based on a determination result of the state determination unit.

公开(公告)号：US20240338286A1

公开(公告)日：2024-10-10

申请号：US18293901

申请日：2022-09-26

Applicant: HITACHI, LTD.

Inventor： Takumi UEZONO ,  Hiroaki ITSUJI ,  Kenichi SHIMBO ,  Masayoshi TAKAHASHI ,  Yutaka UEMATSU

IPC: G06F11/20

CPC classification number: G06F11/2028

Abstract: An arithmetic operation target is input to an information processing apparatus which causes an accelerator apparatus to perform an arithmetic operation using the arithmetic operation target. The information processing apparatus performs, regarding each of a plurality of arithmetic operation elements of the arithmetic operation target, whether to allocate one or more diagnostic circuits, which are available processing circuits for an accuracy diagnosis of the arithmetic operation from a plurality of processing circuits in the accelerator apparatus to the arithmetic operation element on the basis of a failure influence degree. The reliability of the information processing apparatus that is used to judge whether or not to continue an action(s) of the information processing apparatus is calculated on the basis of the number of arithmetic operation elements of the arithmetic operation target, the number of arithmetic operation elements to which at least one diagnostic circuit is allocated, and the failure influence degree.

公开(公告)号：US20170015207A1

公开(公告)日：2017-01-19

申请号：US15121310

申请日：2014-12-08

Applicant: HITACHI, LTD.

Inventor： Isao HOUDA ,  Masayoshi TAKAHASHI ,  Hiroki FUNATO ,  Hitoshi AKIYAMA

IPC: B60L11/18 ,  H02M7/44 ,  H02M1/44 ,  H02M3/156

CPC classification number: B60L11/1803 ,  H02M1/44 ,  H02M3/156 ,  H02M7/44 ,  H02P27/08

Abstract: Provided is a power conversion device capable of selectively suppressing harmonic noise in a frequency band and a machine equipped with the power conversion device. The power conversion device includes a switching element (13), a switching signal generation unit (23, 24) for generating a switching control signal for controlling the turning on/off of the switching element (13), and a control unit (18), and is characterized in that the switching control signal generation unit (23, 24) generates the switching control signal including a combination of a pair of symmetrical pulse waveforms having on and off periods that are interchanged with respect to a repeated cycle.

Abstract translation: 提供一种能够选择性地抑制频带中的谐波噪声的电力转换装置和配备有电力转换装置的机器。 电力转换装置包括开关元件（13），用于产生用于控制开关元件（13）的导通/截止的开关控制信号的开关信号产生单元（23,24），以及控制单元（18） 并且其特征在于，切换控制信号生成单元（23,24）产生切换控制信号，该切换控制信号包括具有相对于重复循环互换的开关周期的一对对称脉冲波形的组合。

公开(公告)号：US20170187299A1

公开(公告)日：2017-06-29

申请号：US15315658

申请日：2015-06-26

Applicant: HITACHI, LTD.

Inventor： Hiroki FUNATO ,  Masayoshi TAKAHASHI

IPC: H02M7/00 ,  H02M7/44 ,  H02G5/02 ,  H02M7/04

CPC classification number: H02M7/003 ,  H02G5/02 ,  H02M7/04 ,  H02M7/44 ,  H05K7/1432

Abstract: A power conversion apparatus is provided with a bus bar connecting a cable connected to an external power supply or load and an internal circuit. To provide this power conversion apparatus with a wiring structure for noise propagation suppression without use of a filter circuit element that causes increase in the volume of the apparatus, the bus bar is provided with an electromagnetic band gap structure. Electromagnetic noise is thereby suppressed from propagating from the power conversion apparatus to the power supply or the load via the cable.