PURPOSE: To carry out positioning and speed control with high accuracy by stopping an actuator after maintaining the actuator at low speed for a prescribed time just before stopping the actuator, and correcting a next low speed maintaining time by the difference between the stopping position thereof and a set target position.
CONSTITUTION: In a control unit 4, the set data of a driving pattern and the like is taken from a setter 5, and a position signal is received from a position detector 2. When an actuator reaches a deceleration start position on the basis of a set data, a speed command is created so as to decelerate the actuator in compliance with a prescribed deceleration pattern, and a flow rate command signal is outputted to a proportional flow rate control valve 3 on the basis thereof. The actuator 1 is thus decelerated, and stopped after lapse of a prescribed time. And then the actuator 1 is stopped, a real stopping position signal is taken-in from a position detector 2, and a deviation between the stopping position and a set target position is found out, and then a deceleration maintain time in the driving pattern is corrected. Next deceleration is controlled by the corrected maintaining time.
| JPS5368389 | FLUID SERVOODEVICE |
YAMAGATA HIDEKI
MORI NAOTOSHI
