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Title:
MOTOR MONITORING DEVICE, MOTOR CONTROL SYSTEM, STEEL ROLLING SYSTEM, AND MOTOR MONITORING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/159249
Kind Code:
A1
Abstract:
The present invention enables accurate detection of the state of a motor at low cost. To this end, the present invention is provided with: a plurality of motors, each comprising a rotary shaft; a plurality of rotary wheels respectively connected to the plurality of rotary shafts; one or a plurality of inverters for supplying AC current to the plurality of motors; a control unit for controlling the inverters; calculation units (42-1, 42-2) which are connected to a motor control system provided with current sensors for detecting the current values (Iu1, Iu2, Iw1, Iw2) flowing through the respective motors, and which calculate the rotation speeds (ωrs1, ωrs2) of the corresponding motors according to the current values (Iu1, Iu2, Iw1, Iw2); and determination units (44, 48) which, on the basis of the current values and the rotation speeds, detect at least one among the overheated state of one of the motors and abnormalities in the diameter differences of the plurality of rotary wheels.

Inventors:
ZHOU Guangbin (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
TAKAHASHI Akeshi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
IWAJI Yoshitaka (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
LI Dongsheng (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
Application Number:
JP2018/005039
Publication Date:
August 22, 2019
Filing Date:
February 14, 2018
Export Citation:
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Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
International Classes:
H02P5/46; H02P29/62
Domestic Patent References:
WO2013035185A12013-03-14
Foreign References:
JP2000060198A2000-02-25
JPS61210801A1986-09-19
JP2002281606A2002-09-27
JPH07194186A1995-07-28
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (Hulic Toranomon Building, 1-18 Toranomon 1-chome, Minato-k, Tokyo 01, 〒1050001, JP)
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