Method and device for acceleration control of servo system

PURPOSE: To improve machining precision and to eliminate a mechanical shock by compensating lost motion due to backlash, elastic deformation such as twisting, and static friction at the time of the movement-directional inversion of a feed shaft and the same-directional movement after a stop at one end under the best acceleration control. CONSTITUTION: An NC command signal from a medium 1 such as a tape is brought under the feed speed control of an acceleration/deceleration control part 2, interpolated by an interpolation part 3, and supplied as a position command signal to a subtraction part 4. The output of the subtraction part 4 is supplied to a position control part 5 for position control processing and then supplied as a speed command signal to an addition/subtraction part 6. A speed control part 7 performs speed control processing and outputs a signal to a servo-amplifier 8 to drive and rotate a motor 11. A pulse encoder 12 detects the quantity of rotation of the motor 11 and supplies it to an acceleration control part 9 and a speed detection part 10. The acceleration control part 9 detects the direction and quantity of movement momentarily and decides the movement state of the feed shaft. A speed detection part 10 detects and supplies the feed speed to the addition/subtraction part 6, which performs addition/subtraction processing. COPYRIGHT: (C)1993,JPO&Japio