| 摘要 |
PURPOSE:To enable precise control and to obtain a predetermined duty ratio by obtaining pulse signals from positive and negative phase FG signals and then combining these pulse signals. CONSTITUTION:FG signals from an input terminal 11 are amplified to produce positive and negative phase signals proportional to the FG signals, and then they are provided to comparators 14, 15. The positive and negative phase signals are then compared, respectively through the comparators 14, 15, with a resistance division level then they are shaped and combined and outputted, as an FG pulse signal, from an output terminal 16. Thus obtained FG signal is converted into a voltage corresponding to the frequency of the pulse signal, and the output voltage is employed as a signal for driving a motor drive and controlling the rotational speed of motor. |
