| 摘要 |
[Problem to be solved] To prevent motors from stopping due to, for example, occurrence of an overspeed alarm at the time of restoration of a main circuit power supply voltage. [Solution] A controller 6 includes a torque limiter 17 that starts first torque limitation which limits a commanded torque based on a torque command Tr to a first torque or less in the case where a voltage detector 5 detects that a DC voltage falls below a predetermined voltage, and cancels the first torque limitation in the case where the voltage detector 5 detects that the DC voltage exceeds the predetermined voltage, and a speed limiter 15 that limits a commanded speed based on a speed command Vr to a first speed or less in the case where the torque limiter 17 cancels the first torque limitation. |
