| 摘要 |
PROBLEM TO BE SOLVED: To stop the inverter apparatus without any trip of over-current even if momentary power failure occurs to realize re-start after recovery of power failure, by compensating positive/negative unbalance of inverter output voltage due to the impulse of main circuit DC voltage and controlling a torque impulse of motor. SOLUTION: This inverter apparatus has a function to compensate for positive/negative unbalance of an inverter output voltage due to impulse of the main circuit DC voltage to control torque impulse of motor by varying an inverter output frequency (d) depending on impulse of the main circuit DC voltage (b). In this case, when fluctuation width of the main circuit voltage (b) is detected and this fluctuation is higher than a predetermined value, an inverter output is forcibly shut out with the function provided. As a result, the inverter apparatus does not generate over-current trip and assures continuous operation by shutting off the output before the inverter output frequency varies sharply and automatically re-starting the inverter after recovery of operation of inverter. |
