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Positional control system and positional control method

  • US 6,738,679 B2
  • Filed: 04/30/2001
  • Issued: 05/18/2004
  • Est. Priority Date: 05/08/2000
  • Status: Expired due to Term
First Claim
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1. A positional control system for controlling a position of a controlled object, comprising:

  • a driving means connected to the controlled object;

    a setting means for setting a variable target position of the controlled object;

    a control command generating means for generating a control command in accordance with said variable target position;

    a position sensor arranged on said controlled object for detecting a position of the controlled object;

    a deviation generating means for generating a deviation between said control command and a detected position of the controlled object;

    a servo control means for generating, in accordance with the deviation, a manipulated variable issued to said driving means for causing said controlled object to follow said variable target position; and

    , a tracking error correction means operated from a first time at which a direction in the feed in the variable target position is reversed and the controlled objected is stopped to a second time at which the movement of the controlled object is re-started, for correcting a lost movement for a mechanical non-linear position error caused by a mechanical coupling of the controlled object and the driving means, which appears at the restart time after the stop.

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