Title:
Motor driving which has a welding detection function of a magnetic contactor
Document Type and Number:
Japanese Patent JP6133827
Kind Code:
B2
Abstract:
An electric motor drive apparatus includes: an AC/DC converter converting AC into DC by the switching of multiple power devices; a control circuit performing PWM switching control of the multiple power devices; a current detecting circuit that detects input current from the AC power supply to the AC/DC converter; an electromagnetic contactor connecting or cutting off power from the AC power supply to the AC converter; and a DC link unit including a smoothing capacitor for smoothing DC voltage, and is constructed such that the control circuit determines that the electromagnetic contactor has been welded when input current is detected in a condition where with the DC link unit having been charged, the electromagnetic contactor is turned off to cut off the power from the AC power supply to the AC/DC converter and the multiple power devices are controlled by PWM switching in accordance with the switching commands.
Inventors:
Kuroki Wataru
Application Number:
JP2014184605A
Publication Date:
May 24, 2017
Filing Date:
September 10, 2014
Export Citation:
Assignee:
FANUC Corporation
International Classes:
H02P3/06; H02P29/024
Domestic Patent References:
| JP2013182701A | ||||
| JP201464349A | ||||
| JP201115567A | ||||
| JP2013121278A | ||||
| JP200995149A | ||||
| JP4120708B2 |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tomohiro Minamiyama
Kenichi Nakamura
Jun Tsuruta
Tomohiro Minamiyama
Kenichi Nakamura