| 摘要 |
PURPOSE:To shorten settling time of a servo at the time of starting a motor by increasing the gain of input stage of an integrator for forming a servo system, rapidly discharging an initial charge voltage of the integrator, and preventing delay of controlling a deceleration by the integrator. CONSTITUTION:A speed discriminator 8 varies a pulse width in response to a difference of a rotating speed until the rotating speed of a motor 1 reaches a predetermined speed. An integrator 5 integrates the periods of acceleration pulse signal output from a charge pump 4 as a continuous control signal. The signal is amplified by a motor driver 7, output to the motor 1, and its speed is controlled in an accelerating direction. The discriminator 8 has a speed detecting function, and obtains a low level output when a motor speed falls within a predetermined speed. This signal is a READY signal, the logic product of a deceleration pulse signal and the READY signal is taken by an AND gate 9a, thereby controlling a switch element SW thereby to increase a discharge amount (gain) via a resistor Rd. As a result, the settling time of a servo is shortened. |
