| 摘要 |
PURPOSE:To prevent resonance by decreasing the gain in the proximity of the resonance point of a filter circuit by means of a correction circuit while simultaneously producing a correction signal having phase advance more than a predetermined value, and correcting an inverter control signal based on the correction signal. CONSTITUTION:An inverter control section 10A is provided with a correction circuit 18 which receives a capacitor voltage signal Efc from a voltage detector 15 and outputs a correction signal fsefc. The correction circuit 18 comprises a filter circuit 19 and an advance compensation circuit 20. The filter circuit 19 has such characteristic as the gain decreases in the proximity of the resonance point of a filter comprising a reactor 2 and a capacitor 3, and the advance compensation circuit 20 advances the phase in the proximity of the resonance point. By such arrangement, vibrations in the mechanical system and the electrical system can be cancelled effectively. |
