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公开(公告)号：US20210133659A1
公开(公告)日：2021-05-06
申请号：US17071011
申请日：2020-10-15
Applicant: Hitachi, Ltd.
Inventor： Kenji FUJIHIRA , Takeshi ITO , Koichiro NAGATA
Abstract: An estimation management system stores a plurality of past estimations each including a proposed plan and a compared plan. The estimation management system accepts input of a trial calculation condition including a plurality of trial calculation condition items for a user to create a new estimation, and sets, as a value of an unentered item in the plurality of trial calculation condition items, a value of a trial calculation condition item of each of a plurality of estimations selected from the plurality of past estimations to make a trial calculation. The estimation management system generates a plurality of trial calculation results corresponding to the plurality of estimations, and evaluates the plurality of trial calculation results in terms of a total cost and a period required for superiority.
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公开(公告)号：US20230102125A1
公开(公告)日：2023-03-30
申请号：US17907846
申请日：2020-10-13
Applicant: Hitachi, Ltd.
Inventor： Akihiro NAKAMURA , Koichiro NAGATA
Abstract: The purpose of the present invention is to provide a device monitoring technique having little restriction even on application to an already-existing device or facilitating monitoring even when a device to be monitored is in variable speed operation or under load variation. One of the representative device monitoring devices of the present invention monitors a device system using, as a power source, an AC electric motor driven by an inverter and is provided with a torque current estimation unit and a state estimation unit. The torque current estimation unit acquires information about AC currents of at least two phases and excitation current of the AC electric motor and calculates a torque current estimated value of the AC electric motor on the basis of the AC currents and the excitation current. The state estimation unit estimates the state of the device system from information including at least one of the feature amounts extracted from the torque current estimated value.
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公开(公告)号：US20180292813A1
公开(公告)日：2018-10-11
申请号：US15920497
申请日：2018-03-14
Applicant: HITACHI, LTD.
Inventor： Koichiro NAGATA , Akihiro NAKAMURA , Shuji SOGA , Naohito IKEDA , Gen TSUCHIDA
IPC: G05B19/418
Abstract: A manufacturing system 10 is configured to include a driving device 4 configured to drive a manufacturing machine 5 in a step pertaining to product manufacture in a predetermined production management system, the driving device 4 driving the manufacturing machine 5 in the step in response to predetermined information obtained related to a state of the step.
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公开(公告)号：US20230070822A1
公开(公告)日：2023-03-09
申请号：US17752420
申请日：2022-05-24
Applicant: Hitachi, Ltd.
Inventor： Akihiro NAKAMURA , Koichiro NAGATA , Takuma NISHIMURA
IPC: F16H61/12 , F16H59/70 , F16H59/14 , G01M13/028 , G01R19/00
Abstract: Provided is a transmission device monitoring system including: a diagnostic frequency estimation unit that extracts a plurality of diagnostic frequency candidate groups from a frequency region separated by a specific frequency or more using at least current information on a motor, a gear ratio of a transmission device, and the number of stages of the transmission device, and estimates a frequency satisfying a specific relationship from frequencies obtained in the plurality of diagnostic frequency candidate groups as a diagnostic frequency; and an abnormality diagnosis unit that diagnoses abnormality of the transmission device using at least the one diagnostic frequency estimated by the diagnostic frequency estimation unit.
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