Title:
DEVICE MONITORING DEVICE AND DEVICE MONITORING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/176761
Kind Code:
A1
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.
Inventors:
NAKAMURA AKIHIRO (JP)
NAGATA KOICHIRO (JP)
NAGATA KOICHIRO (JP)
Application Number:
PCT/JP2020/038614
Publication Date:
September 10, 2021
Filing Date:
October 13, 2020
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02P23/14; H02P21/14
Domestic Patent References:
| WO2017110855A1 | 2017-06-29 | |||
| WO2019163125A1 | 2019-08-29 | |||
| WO2019049188A1 | 2019-03-14 |
Foreign References:
| JPH02163290A | 1990-06-22 | |||
| JP2010200584A | 2010-09-09 | |||
| JPH0389884A | 1991-04-15 | |||
| JP2013078200A | 2013-04-25 | |||
| JP2015061492A | 2015-03-30 | |||
| JP2010081743A | 2010-04-08 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY DAI-ICHI KOKUSAI TOKKYO JIMUSHO (JP)
Download PDF: