Title:
FAILURE DETECTION DEVICE THAT DETECTS FAILURE OF PARALLEL-DRIVEN SWITCH, AND MOTOR DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/235367
Kind Code:
A1
Abstract:
Provided are: a failure detection device in which a plurality of switches connected in parallel are provided in a current path, the failure detection device detecting a failure in a switch in the circuit in which the plurality of switches are driven in parallel, and preventing abnormal overheating; and a motor drive device provided with said failure detection device. A failure detection device 1 that detects failure in switches 21-1 to 21-n that are selectively switched between conduction and non-conduction in a current path 50 comprises: two or more temperature sensors 11 to 11-m in which a resistance value between terminals changes in accordance with temperature changes, the two or more temperatures sensors 11 to 11-m being provided near two or more of the switches 21-1 to 21-n connected to each other in parallel, and the two or more temperatures sensors 11 to 11-m being electrically connected in series to each other; a detection unit 12 that detects the combined resistance value of the two or more temperature sensors 11 to 11-m; and a determination unit 13 that determines, based on a combined resistance value, that one or more of the two or more switches 21-1 to 21-n has failed.
Inventors:
NAKAGAWA YUUYA (JP)
Application Number:
PCT/JP2021/018488
Publication Date:
November 25, 2021
Filing Date:
May 14, 2021
Export Citation:
Assignee:
FANUC CORP (JP)
International Classes:
H02H9/02; H02H5/04; H02J1/00
Foreign References:
| JP2013211950A | 2013-10-10 | |||
| KR20170099287A | 2017-08-31 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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