Patent ID: 8901866

Claim:
A motor drive apparatus, comprising: an AC/DC converter configured to convert AC power supplied from an AC power supply to DC power; a DC/AC converter configured to convert DC power to AC power for driving a motor or convert AC power regenerated by the motor back to DC power; a DC link unit which connects a DC side of the AC/DC converter to a DC side of the DC/AC converter to deliver the DC power between the DC side of the AC/DC converter and the DC side of the DC/AC converter; an energy storage unit which includes at least one capacitor storage unit and at least one flywheel storage unit each of which is connected to the DC link unit and configured to store the DC power supplied from the DC link unit and supply the stored DC power to the DC link unit; a motor control unit configured to, based on a motor operation command for commanding operation of the motor, perform control so that the DC/AC converter outputs desired AC power; and an energy control unit configured to perform control so that the energy storage unit stores the DC power supplied from the DC link unit or supplies the stored DC power to the DC link unit, wherein the energy control unit is configured to during acceleration control of the motor performed by the motor control unit, cause both the capacitor storage unit and the flywheel storage unit to supply the DC power to the DC link unit at a constant power supply ratio between amounts of the DC power that the capacitor storage unit and the flywheel storage unit supply to the DC link unit, and during deceleration control of the motor performed by the motor control unit, cause both the capacitor storage unit and the flywheel storage unit to store the DC power from the DC link unit at a constant a power storage ratio between amounts of the DC power that the capacitor storage unit and the flywheel storage unit store from the DC link unit.