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Servo controlling device and method

  • US 20030139824A1
  • Filed: 12/31/2002
  • Published: 07/24/2003
  • Est. Priority Date: 03/27/2000
  • Status: Active Grant
First Claim
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1. A servo controlling method which has a control loop using a position/speed feedback and drives a feed axis of a machine tool, wherein after a movement reversal of the feed axis is detected, a control loop is modeled, and a virtual internal model using constants of values that are different from those of the constants used in the control loop;

  • a virtual torque instruction calculated in the virtual internal model is added to a torque instruction for driving the feed axis;

    when said virtual torque instruction reaches a predetermined value, said adding is terminated; and

    when the adding is terminated, a value of an integrator within the virtual internal model at this point is added to a corresponding integrator of the position/speed feedback group.

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