| 摘要 |
PURPOSE:To enable to calculate the phase voltage under a digital control by obtaining the primary voltage set value by the absolute value and the variation in the phase, and obtaining the variation in the phase from the differentiated value of the secondary current set value. CONSTITUTION:The magnitude of a voltage vector converter in polar coordinates from the alpha-, beta-phase primary voltages is obtained by a voltage calculator 9, and the variation in the angular frequency is obtained from the current set value by an angular frequency variation calculator 10. An angular frequency is obtained by an angular frequency calculator 6A, and a sinusoidal signal is generated from a sinusoidal generator 11 on the basis of the angular frequency. The a-, b-, c-phase voltage set values are output from 3-phase voltage calculator 12 on the basis of the sinusoidal signal and the output from the calculator 9. |
