| 摘要 |
PURPOSE:To draw speed in a short time even in any mode by storing stationary operation output of digital filters for each mode in a memory means. CONSTITUTION:As frequency dividing ratio and address of a frequency dividing means 7 and a memory means 9 are set according to a mode command signal S2 in a period t1-t2, read out output D3 of address A of the memory means 9 is preset to a digital filter 4, and a motor 1 is started after making D2=D1, and at a time t2, the filter is returned to normal operation and made to the state of writing. When speed is switched to A2 mode at a time t3, output D2 of the filter 4 immediately before the time t3 is stored and remains in address A1. In a period t3-t4, read out output D3 of address A2 of the memory means 9 is preset to the filter 4, and similar operation is performed. Thus, speed drawing from transitional state to stationary state of each mode can be made in a short time. |
