| 摘要 |
PURPOSE:To control with higher resolution without increasing the output frequency of a tachometer generator by setting two or more collating points from a measuring point to next measuring point. CONSTITUTION:The output of a tachometer generator 2 coupled with a motor 1 is amplified until becoming the prescribed amplitude by a voltage control amplifier (VCA)3. When the output is rising, it is compared by a comparator 11 with the output 6a of a programmable voltage source 6, an output signal is generated whenever the output of the VCA3 becomes higher than the potential of the output 6a, compared by a comparator 12 with the output 6b of the voltage source when the output of the VCA3 drops, and the comparator generates an output signal. Since the comparators 11, 12 sequentially generate output signals, a pulse train is presented from a channel selector 5. This pulse train equally divides one cycle of a tachometer generator 2 into 20, the interval of the pulse train is compared with a reference value to obtain the error output as it is, thereby controlling it. |
