Motor drive device including PWM converter controlled in boosting ratio
AssigneeFanuc Corporation
InventorWataru Kuroki
Life of this patent
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Abstract
A motor drive device includes a PWM converter configured to convert AC power supplied from an AC power supply into DC power and supply it to a DC link, a DC link capacitor which is provided in the DC link and may store the DC power, an inverter configured to convert the DC power in the DC link into AC power for motor driving and output it, and a boosting ratio control unit configured to control the boosting ratio as the ratio of the value of the DC voltage output from the PWM converter to the peak value of the AC voltage input from the AC power supply, to allow a motor to be driven using AC power output by converting the DC power stored in the DC link capacitor by the inverter during shut-off of supply of the DC power from the PWM converter to the DC link.
Claims6
A motor drive device comprising:
- a PWM converter configured to convert AC power supplied from an AC power supply into DC power by PWM control and supply the DC power to a DC link;
- a DC link capacitor which is provided in the DC link and configured to store the DC power;
- an inverter configured to convert the DC power in the DC link into AC power for motor driving and output the AC power;
- and
- a boosting ratio control unit configured to control a boosting ratio as a ratio of a value of a DC voltage output from the PWM converter to a peak value of an AC voltage input from the AC power supply, to allow a motor to be driven using the AC power output by converting the DC power stored in the DC link capacitor by the inverter during shut-off of supply of the DC power from the PWM converter to the DC link.
Dependencies are inferred from the claim text.