| 摘要 |
PROBLEM TO BE SOLVED: To suppress influences such as a beat phenomenon upon a motor output, even if ripples exist in a DC link voltage, and moreover if various delays exist in a control system. SOLUTION: A main circuit comprises collecting means 41 and 42, a voltage step- down means 16, a single phase converter 17, a DC filter capacitor 1, an inverter 2 and a permanent magnet synchronous motor 4. A voltage detecting means 3, which detects a DC link voltage, a voltage control means 18 which controls the single phase converter 17 so as to have the DC link voltage match with the command voltage, a modulation factor reference calculating means 9 which calculates modulation factor reference of the inverter 2, a ripple value detecting means 9 which extracts ripple components from the DC link voltage, a modulation factor calculating means consisting of a modulation factor compensating means 11 which compensates for the modulation factor reference according with to the ripple component of the DC link voltage and outputs the modulation factor of the inverter 2, a phase compensating means 10 which compensates for the phase of the ripple component of the DC link voltage according to a phase compensation value and a gate control means 8, which controls the inverter 2 so as to output a voltage corresponding to the modulation factor are arranged. |
