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

• Main Authors: NAKAGAWA HIRONARI, HORIKOSHI SHINICHI
• Format: Patent
• Language: English; Japanese
• Published: 29.08.2019
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

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 【課題】ＤＣリンク部に設けられた複数のコンデンサの短絡故障を早期に検知して安全が確保されるモータ駆動装置を実現する。【解決手段】モータ駆動装置１は、交流電源２の交流電力をＰＷＭ制御により直流電力に変換して出力するＰＷＭコンバータ１１と、ＰＷＭコンバータ１１の直流出力側に設けられ、直列接続された複数のコンデンサを有するＤＣリンク部１２と、ＤＣリンク部１２に接続され、ＤＣリンク部１２の直流電力をモータ３の駆動のための交流電力に変換して出力するインバータ１３と、ＤＣリンク電圧検出部１６と、電源電圧検出部１７と、ＤＣリンク電圧値が電源電圧の波高値を下回った場合、複数のコンデンサのうち少なくとも１つが短絡したと判定する短絡判定部１４と、短絡判定部１４が複数のコンデンサのうち少なくとも１つが短絡したと判定した場合、交流電源２からＰＷＭコンバータ１１への交流電力の流入を遮断する遮断部１５とを備える。【選択図】図１