| 摘要 |
PURPOSE:To accurately operate at a variable speed in a wide range by digitally processing with noninterference calculation to obtain a PWM voltage control signal in which the secondary magnetic flux and the secondary current are perpendicularly crossed. CONSTITUTION:A noninterference calculator 6 calculates the primary voltages e1alpha, e1beta of alpha-beta shaft in accordance with alpha-shaft primary current set value i1alpha* and beta-shaft primary current set value i1beta, and calculates in noninterference for eliminating mutal interference in the calculation. A coordinates converter 7 converts the primary voltages e1alpha, e1beta into polar coordinates data. A PWM waveform calculator 8 obtains to PWM-waveform process signals corresponding to the voltages ea, eb, ec of 3-phase fixed shafts from the polar coordinates signals ¦E¦, phi of a voltage vector V. |
