Title:
MOTOR DRIVING DEVICE WITH FAILURE DETECTION FUNCTION
Document Type and Number:
Japanese Patent JP2019075851
Kind Code:
A
Abstract:
To solve a problem in which a motor driving device itself has not been able to detect a failure because a feedback current is not generated in a state that a motor is not connected to the motor driving device.SOLUTION: A motor driving device of an embodiment of the present invention comprises: an inverter for converting a DC voltage to an AC voltage by switching a plurality of power elements; a current detection unit for detecting a current outputted from the inverter; a current control unit for creating a voltage command; a control signal generation unit for controlling the switching of the plurality of power elements of the inverter; a dynamic brake circuit equipped with a plurality of relays for short-circuiting the output side terminals of the inverter through a plurality of resistors; a memory unit for memorizing a first threshold level for determining an initial current value and a presence/absence of failure; and a failure determination unit for determining the presence/absence of failure on the basis of the results acquired by comparing between the current deviation rate from the initial current value and the first threshold level in comparison with the current value and the initial current value after a predetermined time passes after the initial current value is detected.SELECTED DRAWING: Figure 1
Inventors:
SAITO SO
KAGAWA TSUTOMU
KAGAWA TSUTOMU
Application Number:
JP2017198612A
Publication Date:
May 16, 2019
Filing Date:
October 12, 2017
Export Citation:
Assignee:
FANUC LTD
International Classes:
H02P29/024; H02P27/04
Domestic Patent References:
| JP2009165296A | 2009-07-23 | |||
| JP2001037284A | 2001-02-09 |
Foreign References:
| US20090174349A1 | 2009-07-09 | |||
| CN101483402A | 2009-07-15 |
Attorney, Agent or Firm:
Atsushi Aoki
Shinji Mitsuhashi
Hirose Shigeki
Kenichi Nakamura
Shinji Mitsuhashi
Hirose Shigeki
Kenichi Nakamura