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公开(公告)号：US20160245851A1
公开(公告)日：2016-08-25
申请号：US15041131
申请日：2016-02-11
Applicant: Hitachi, Ltd.
Inventor： Tetsuji KATO , Kohji MAKI , Tomoaki HIRUTA
CPC classification number: G01R31/343
Abstract: An anomaly diagnosis system is provided that includes: a current-value obtaining part 111 that obtains a value of an AC current inputted to or outputted from a device to be diagnosed; a frequency analyzing part 112 that converts the current values obtained at intervals into a frequency spectrum which correlates a current intensity with a frequency; an anomaly-judging-value calculating part 113 that calculates at intervals a frequency width of the frequency spectrum at a current intensity “As” satisfying As=m×At (0
Abstract translation: 提供了一种异常诊断系统，其包括：电流值获取部111，其获得输入到要被诊断的装置输出的AC电流的值; 频率分析部分112，其将在间隔获得的电流值转换成将电流强度与频率相关联的频谱; 异常判定值计算部113，其以满足As = m×At（0
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公开(公告)号：US20230091068A1
公开(公告)日：2023-03-23
申请号：US17801922
申请日：2020-07-29
Applicant: Hitachi, Ltd.
Inventor： Kohji MAKI
IPC: G05B23/02
Abstract: The objective of the present invention is to realize an operating state classification system having a classification accuracy that continuously improves through additional learning, and which is appropriately protected from unauthorized duplication of a classification function. In this operating state classification system, in which an edge device and a server are connected by means of a communication network, and which inputs sensor data into a neural network and outputs a state label: the edge device includes a first storage unit which stores an upstream side of the neural network, and a dimensionality reduction unit which inputs the sensor data into the upstream side of the neural network and outputs intermediate data; and the server includes a second storage unit which stores a downstream side of the neural network, an inference executing unit which inputs the intermediate data into the downstream side of the neural network and outputs the state label, and a learning unit which updates the downstream side of the neural network by means of additional learning.
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公开(公告)号：US20200089207A1
公开(公告)日：2020-03-19
申请号：US16617084
申请日：2018-02-22
Applicant: Hitachi, Ltd.
Inventor： Munetoshi UNUMA , Kohji MAKI , Tetsuji KATO
IPC: G05B23/02
Abstract: A failure diagnosis system flexibly responds to a change in a diagnosis target by using a difference in measurement data before and after maintenance in predictive failure diagnosis. A pre-maintenance data DB stores measurement data before maintenance, and a post-maintenance data DB stores measurement data after maintenance. A feature detection algorithm group DB is provided where a plurality of feature detection algorithms are stored. A first feature is detected based on the measurement data by using each of the plurality of feature detection algorithms read from the feature detection algorithm group DB. An algorithm search unit selects one of the plurality of algorithms based on the feature thus detected. A second feature is detected from the measurement data by using the feature detection algorithm, and a sign predictive of failure of diagnosis of target equipment is diagnosed using the detected second feature.
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公开(公告)号：US20170089983A1
公开(公告)日：2017-03-30
申请号：US15266648
申请日：2016-09-15
Applicant: Hitachi, Ltd.
Inventor： Tetsuji KATO , Kohji MAKI , Minori NAGATA
CPC classification number: G01R31/34 , G01R31/025 , G01R31/343 , G06N3/126
Abstract: A rotary machine diagnostic system includes: a current measurement unit for measuring a leakage current of a rotary machine; a voltage measurement unit for measuring a voltage of the rotary machine corresponding to the flowing leakage current; and a data processing unit. The data processing unit has a function of performing transient response analysis on a predetermined equivalent circuit model, which is equivalent to a leakage current path of the rotary machine, using current data and voltage data having a predetermined time width which are respectively measured at predetermined time intervals by the current measurement unit and the voltage measurement unit, and a function of extracting parameters of the equivalent circuit of the leakage current path.
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公开(公告)号：US20190146036A1
公开(公告)日：2019-05-16
申请号：US16308543
申请日：2017-03-27
Applicant: HITACHI, LTD.
Inventor： Tetsuji KATO , Kohji MAKI , Minori NAGATA
IPC: G01R31/34 , G01M13/028
Abstract: A rotor diagnostic apparatus includes a parameter selection part that calculates evaluation values indicating how much sensor values of a rotor at a given time point deviate from a reference value at which the rotor is known to be in a normal state, the given time point being after the rotor is known to be in the normal state and before the rotor is to be diagnosed, and selects a plurality of parameters to be used for abnormality diagnosis of the rotor from the sensor values based on the calculated evaluation values. A diagnosis part outputs an abnormality value which is indicative of how abnormal the rotor is and which is obtained based on a distance, in a multidimensional space having the selected parameters as coordinate axes, between a figure represented by sensor values in the normal state and a figure represented by sensor values targeted for diagnosis.
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Patent Agency Ranking
公开(公告)号：US20180011480A1
公开(公告)日：2018-01-11
申请号：US15544298
申请日：2015-01-20
Applicant: HITACHI, LTD.
Inventor： Tomoaki HIRUTA , Kohji MAKI , Tetsuji KATO , Yoshitaka ATARASHI
CPC classification number: G05B23/0208 , G01R31/343 , G05B23/0227
Abstract: An operation mode specifying unit specifies an operation mode of a machine by comparing time-series data of an amplitude and a frequency of measurement data obtained from a sensor with definition data of the operation mode of the machine created in advance by an operation mode data creation unit. In addition, an abnormality diagnosis unit performs processing of cluster analysis for the measurement data obtained from the sensor or the like, and diagnoses abnormality of the machine according to diagnosis procedure information that is set in advance depending on the set operation mode and an abnormality mode of the machine.
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公开(公告)号：US20150331051A1
公开(公告)日：2015-11-19
申请号：US14707245
申请日：2015-05-08
Applicant: Hitachi, Ltd.
Inventor： Kohji MAKI , Shinya YUDA , Hiroaki KOJIMA , Satoshi KIKUCHI , Hisashi ENDO
CPC classification number: G01R31/343 , G01M13/04 , G01R31/025 , G01R31/12 , G01R31/34
Abstract: Provided is a deterioration diagnosis system which diagnoses deterioration of an N-phase rotational machine (N denotes a natural number). The deterioration diagnosis system includes a first current sensor to be attached individually to at least lead wires of (N-1)-phases in a rotational machine, the first current sensor being able to detect a current amplitude arising from a plurality of deterioration causes, and a second current sensor to be attached collectively to the lead wires of all phases in the rotational machine, the second current sensor being able to detect a current amplitude arising from a plurality of deterioration causes.
Abstract translation: 提供了诊断N相旋转机器的劣化的劣化诊断系统（N表示自然数）。 劣化诊断系统包括：第一电流传感器，其分别连接到旋转机器中的（N-1）相的至少导线上，第一电流传感器能够检测由多个劣化原因引起的电流幅度， 以及第二电流传感器，其集体地附接到旋转机器中的所有相的引线，第二电流传感器能够检测由多个劣化原因引起的电流幅度。
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公开(公告)号：US20180059656A1
公开(公告)日：2018-03-01
申请号：US15557242
申请日：2015-03-12
Applicant: Hitachi, Ltd.
Inventor： Tomoaki HIRUTA , Kohji MAKI , Tetsuji KATO , Yoshitaka ATARASHI
CPC classification number: G05B23/0243 , G01M13/00 , G01M13/045 , G01M15/14 , G01M99/005 , G01R31/00 , G01R31/343 , G05B23/0267 , G05B23/0283 , G06N20/00
Abstract: The purpose of the present invention is to provide a machine diagnostic device that assists with sensor attachment such that malfunction sensing performance may be maintained even after maintenance of a device. The machine diagnostic device includes a sensor data acquisition part that acquires time-series sensor data that are measured by sensors that are attached to a machine that has one or more operating modes; a learning unit that statistically processes the sensor data prior to detachment of the sensors and computes a normal operation model; a malfunction diagnostic unit that diagnoses a malfunction of the machine on the basis of the sensor data and the normal operation model; and a sensor adjustment unit that, when the sensors are re-attached to the machine after the sensors have been detached therefrom, displays, in a display unit, as a sensor adjustment mode, discrepancies between the normal operation model prior to the detachment of the sensors and the post sensor attachment sensor data.
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公开(公告)号：US20170219655A1
公开(公告)日：2017-08-03
申请号：US15501250
申请日：2014-09-08
Applicant: Hitachi, Ltd.
Inventor： Tetsuji KATO , Kohji MAKI
Abstract: An object is to conduct an insulation degradation diagnosis with a simple configuration. An insulation diagnostic system includes a current detection sensor 4a that is installed, for a coil 3a of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start position and a winding end position, such that the current detection sensor 4a surrounds a current path flowing into a leader line at the winding start of the coil 3a and a current path flowing out from a leader line at the winding end of the coil 3a.
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公开(公告)号：US20150381005A1
公开(公告)日：2015-12-31
申请号：US14769145
申请日：2013-02-25
Applicant: HITACHI, LTD.
Inventor： Tetsuji KATO , Kohji MAKI , Koji OBATA , Daisuke KORI
IPC: H02K3/40
CPC classification number: H02K3/40
Abstract: The present invention aims to provide a rotary machine in which deterioration or a burnout of a corona prevention layer in the vicinity of a slot outlet of a stator can be suppressed from occurring. The present invention includes a stator that has a stator core, and a rotor that is arranged so as to face the stator and is rotatably held. In the rotary machine in which a stator coil having a low-resistance corona prevention layer wound around is mounted on the stator core, a conductive member is formed on the stator coil at an end portion of the stator so as to have a structure in which a gap with respect to the stator coil is widened as the conductive member is positioned away from the stator core in a rotary shaft direction of the rotary machine.
Abstract translation: 本发明的目的在于提供一种能够抑制定子的槽出口附近的电晕防止层的劣化或烧坏的旋转机械。 本发明包括具有定子芯的定子和与定子相对配置并可旋转地保持的转子。 在具有缠绕在其上的具有低电阻防晕层的定子线圈安装在定子铁芯上的旋转机械中，在定子线圈的定子的端部形成导电部件，以便具有如下结构： 当导电构件沿着旋转机械的旋转轴方向远离定子芯定位时，相对于定子线圈的间隙变宽。
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