| 摘要 |
PURPOSE:To obtain a primary current command, which is not adjusted and has high precision, by digitizing signal processing by using a counter and a DA converter. CONSTITUTION:A slip frequency generator 1 generates the pulse signal of the rated slip frequency fS of a motor on the rated command of I2REF and ImREF. A function generator 10 generates characteristics shown in the graph displaying the relationship of a exciting-current command and the number of revolution on field-weakening control. DA converters 11, 12 convert the signal of digital 8BIT into an analog signal. DA converters 13-16 constitute a multiplier. A mixer 17 generates the mean voltage of output signals A, -A from the slip frequency generator. A low-pass filter 19 outputs fundamental-wave components in response to the output signals A, -A. A primary frequency generator 20 frequency-addes output signals B, -B from the low-pass filter 19 and detecting signals C, D from a resolver. |
