公开(公告)号：US20190245474A1

公开(公告)日：2019-08-08

申请号：US16267790

申请日：2019-02-05

Applicant: FANUC CORPORATION

Inventor： Yuuta GOTOU ,  Yasuyuki MATSUMOTO ,  Masaya TATEDA

IPC: H02P29/00 ,  H02P27/06 ,  H02P23/14

Abstract: A motor drive apparatus includes a converter configured to convert AC power of an AC power supply into DC power and outputs the DC power, a DC link unit including capacitors connected in series with each other, an inverter connected in parallel with the DC link unit, and configured to convert the DC power of the DC link unit into AC power for driving a motor, and outputs the AC power, and a short-circuit judgment unit configured to judge that at least one of the capacitors in the DC link unit has shorted in the case where, when the value of a voltage applied to a positive and negative bipolar terminal of the DC link unit is smaller than a first threshold, the value of an input current flowing from the AC power supply into the DC link unit via the converter is larger than a second threshold.