| 摘要 |
PURPOSE:To make control with reduced error detection ripple, by modifying a reference speed data when the sign of a speed error signal does not match with the sign of previous speed error signal. CONSTITUTION:A speed error detector 5 measures the interval of leading edge of output signal from a frequency generator 2 every time when it arrives. Classification between X and Y sections is made in a reference value correction block 10 based on an output from FF14, and a fixed reference value is corrected according to correction amounts of X and Y corresponding to respective sections. The speed error detector 5 outputs an error signal between a detected speed and a corrected reference speed data. When the sign of current error signal does not match with the sign of previous error signal, a sign matching unit 12 judges whether the error is plus or minus and increments or decrements the correction amounts for X and Y sections correspondingly. |
