| 摘要 |
PURPOSE:To achieve a high gain without giving a delay to the phase of a current flowing to a coil, by connecting a capacitor in parallel with a resistor, when one end of the coil of an actuator is grounded via the resistor. CONSTITUTION:A non-inverting input terminal of an operational amplifier 5 is taken as a signal input terminal and a coil 4 of an actuator is connected to the output side. Another end of the coil 4 is grounded via a parallel circuit consisting of a resistor 3 and a capacitor 4, and via a series circuit of resistors 2 and 1. The connecting point of the two resistors 1 and 2 is connected to an inverting input terminal of the amplifier 5. Since the phase of a current flowing to the coil 4 can be made lead by adding a capacitor 6, the phase lag of the actuator in the loop of a servo system can be decreased, allowing to obtain a stable servo system with high gain easily. |
