| 摘要 |
The present invention is provided with: an inverter (8) that, with an MOSFET element (21) and a diode element (22) connected in antiparallel as one arm (20), has at least two legs (23) comprising two arms (20) connected in series, and drives an electric motor (1) that raises/lowers an elevator car (4); a current detector (13) that detects the direction of current flowing between the inverter (8) and the electric motor (1); and a drive control unit (9) that controls the driving of the inverter (8) on the basis of a speed command value generated by a driving control unit (10) having an automatic driving mode and a conservative driving mode. When the speed command value is no greater than a speed in the conservative driving mode, the drive control unit (9) turns off the gate of the MOSFET element (21) of the arm (20) through which the direction of the current detected by the current detector (13) is flowing in the forward direction of the diode element (22). |
