MOTOR DRIVE DEVICE HAVING SHORT-CIRCUIT JUDGING PORTION FOR CAPACITOR OF DC LINK PORTION

摘要

PROBLEM TO BE SOLVED: To provide a motor drive device capable of realizing in which a short circuit failure of a plurality of capacitors provided in a DC link portion is detected at an early stage to ensure safety.;SOLUTION: A motor drive device 1 includes: a PWM converter 11 for converting AC power of an AC power supply 2 into DC power by PWM control and outputting; a DC link portion 12 provided on the DC output side of the PWM converter 11 and having a plurality of capacitors connected in series; an inverter 13 connected to the DC link portion 12 and converting the DC power of the DC link portion 12 into AC power for driving a motor 3, and outputting the AC power; a DC link voltage detecting portion 16; a power supply voltage detecting portion 17; a short-circuit judging portion 14 that judges that at least one of the plurality of capacitors is short-circuited, when the DC link voltage value falls below a peak value of the power supply voltage; and a blocking portion 15 that blocks the inflow of AC power from the AC power supply 2 to the PWM converter 11, when the short-circuit judging portion 14 judges that at least one of the plurality of capacitors is short-circuited.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT