| 摘要 |
PURPOSE:To accelerate a response by shortcircuiting the integrating constant of an incomplete integrating amplifier only when a speed feedback signal is ''0'' when an induction motor stops, thereby shortening the time delay under control at the starting time. CONSTITUTION:When an induction motor is stopped, input/output terminals of the first operational amplifier 7 and a resistor 5 and a capacitor 6 which form an incomplete integrating amplifier are shortcircuited through a diode 17 by conducting a FET16. The amplifier 7 forms a proportional amplifier which uses the foward resistance value of the FET16 and the diode 17 as a feedback resistor. When a speed feedback signal becomes positive, its shortcircuit is eliminated to return to the incomplete integrating amplifier. |
