| 摘要 |
PURPOSE:To accurately control without influence of variation in a DC voltage by obtaining the 3-phase voltage set value obtained by vector control by 2-phase/ 3-phase converting the result of dividing the detected value of the DC voltage of an inverter by a reference voltage. CONSTITUTION:A motor 1 is driven by a PWM inverter 2, a magnetic flux set value i1alpha*, a secondary current set value i1beta* and power angular frequency omega0 are inputted to a calculator 4, and controlled through a phase voltage calculator 4. At this time, the DC voltage detection value Edc of the inverter 2 is divided by a reference DC voltage EN, inputted to dividers 17d, 17q together with voltages e1d, e1q converted via synchronous rotary coordinates/stationary coordinates conversion from alpha-phase primary voltage e1alpha, beta-phase primary voltage e1beta, and 3-phase voltage set values ea*, eb*, ec* are obtained through a 3-phase/3-phase converter 19, thereby controlling the inverter 2. Accordingly, the DC voltage variation amount can be compensated, and highly accurate vector control can be performed. |
