Patent ID: 9444373
Filing Date: 2016-09-13
CPC Classification: H02H,H02M,H02P

Claim Text:
1. A motor control device comprising: a rectifier that rectifies AC power supplied from an three-phase AC input side and outputs DC power; a smoothing capacitor provided to a DC link which is a DC output side of the rectifier; an inverter that mutually power-converts DC power in the DC link and AC power which is driving power or regenerative power of a motor; an initial charging unit having a switch unit and a charging resistor connected in parallel to the switch unit, opening the switch unit before motor driving is started, and charging the smoothing capacitor with a DC current output from the rectifier via the charging resistor; a current detection unit that detects an AC current value of the three-phase AC input side of the rectifier, and outputs an AC current detection value; a current conversion unit that outputs a conversion value obtained by converting the AC current detection value into a value corresponding to a DC current in the DC link; a current integration unit that outputs an integration value obtained by integrating the conversion value output from the current conversion unit during a charging period of the smoothing capacitor by the initial charging unit; an alarm output unit that outputs an alarm when the integration value is equal to or more than a first threshold value; a disconnecting unit that is able to disconnect supply of the AC power to the rectifier in response to a received command; and a protective unit that commands the disconnecting unit to disconnect the supply of the AC power when the alarm is output.