| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverter device that can instantaneously limit current for preventing the damage of an element, and can efficiently stabilize an electric motor for operating. SOLUTION: This inverter device carries our PWM modulation for outputting voltage based on a frequency command value Fref, and a voltage command vector obtained according to a voltage command value that is obtained by V/f operation 7 according to the frequency command value. In the inverter device, means 12a, 15, 16, 17, and 11 are provided. IN this case, the means 12a detects a current vector consisting of a level I1 of current and a current phase θi, the means 15 obtains a voltage limitation value ΔV being proportional to the amount of excess when the current level exceeds a current limitation value Imax, the means 16 converts the voltage limitation value to voltage limitation vectors ΔVq and ΔVd based on a current phase, a voltage correction means 17 adds the voltage limitation vector to the voltage command vector, and the means 11 corrects the acceleration command of a frequency based on the voltage limitation value and current phase. |
