| 摘要 |
PURPOSE:To improve the rising time and transient response characteristics of a control system by impressing a speed detecting output voltage for speed control system to one end of a capacitor in a lag filter constituting a phase control system. CONSTITUTION:A phase/speed control circuit for controlling the rotational phase and a rotational speed of a motor 1 is constituted of a phase detector 2, a phase wave detector 4, a speed detector 3, a speed wave detector 5, a lag filter 6 in a phase control system, an operational amplifier 7, and a transistor 8. At that time, a speed detecting output voltage VF is impressed to the capacitor C1 in the lag filter 6 through a buffer amplifier 10. Since VP=VF is always formed between the phase detecting output VP and the speed detecting output VF at the time of servo lock, the voltage between both the ends of the capacitor C1 is always held at zero volt even if a speed set value is changed. Consequently, the rising time or the like of the control system can be improved without using a bias switching circuit or the like due to the change of the objective speed. |
