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US 2001/0054876 A1Published application
Positional control system and positional control method
AssigneeToshiba Kikai Kabushiki Kaisha
InventorsJun Fujita, Minoru Hamamura
Life of this patent
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Abstract
A positional control system wherein the position of the controlled object connected to a drive means is controlled to a variable target or desired position. A period is determined which starts with a detection of a reversal in the direction of the feed of a positional command Pr as well as the detection of a stoppage of a table 104 as a controlled object and which ends with a detection of the re-start of the movement of the table 104. During the period, a correction amount for correcting a positional deviation E is issued.
Claims16
A positional control system comprising:
- a controlled object;
- 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 from said control command and a detected position of the controlled object;
- a serve 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 in a period which is commenced when a direction in the feed in the variable target position is reversed and when the controlled objected is stopped and which is ceased when the movement of the controlled object is re-started, for correcting the deviation, so that a tracking error of said controlled object with respect to said variable target position as generated by said reversal in the direction of the feed is restricted.
6 more elements
A positional control system comprising:
- a controlled object;
- 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 first position sensor on said controlled object for detecting a position of the controlled object;
- a second position sensor arranged on said driving means for detecting a driving position of the driving means;
- a deviation generating means for generating control deviation of the controlled object from said control command, the detected position of the controlled object and detected driving position of the driving means;
- a serve control means for generating, in accordance with the control 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 in a period which is commenced when a direction in the feed in the variable target position is reversed and when the controlled objected is stopped and which is ceased when the movement of the controlled object is re-started, for modifying a correction amount for correcting said detected driving position, so that a tracking error of said controlled object with respect to said variable target position as generated by said reversal in the direction of the feed is restricted.
7 more elements
A position control method comprising the steps of:
- providing a controlled object;
- providing driving means connected to the controlled object;
- setting a variable target position of the controlled object;
- generating control command in accordance with said variable target position;
- providing a position sensor in a controlled object;
- detecting a position of the controlled object by said position sensor;
- generating a deviation from said control command and a detected position of the controlled object;
- effecting a servo-control by 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;
- correcting said deviation during a period which is commenced when a direction in the feed in the variable target position is reversed and when the controlled objected is stopped and which is ceased when the movement of the controlled object is re-started, so that a tracking error of said controlled object with respect to said variable target position as generated by said reversal in the direction of the feed is restricted.
6 more elements
A position control method comprising the steps of:
- providing a controlled object;
- providing driving means connected to the controlled object;
- setting a variable target position of the controlled object;
- generating control command in accordance with said variable target position;
- providing a position sensor in a controlled object;
- detecting a position of the controlled object by said position sensor;
- providing a position sensor in the driving means;
- detecting a driving position of the driving means by the driving position sensor;
- generating a deviation from said control command and a detected driving position of the driving means;
- effecting a servo-control by 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;
- modifying correcting amount for correcting the detected driving position during a period which is commenced when a direction in the feed in the variable target position is reversed and when the controlled objected is stopped and which is ceased when the movement of the controlled object is re-started, so that a tracking error of said controlled object with respect to said variable target position as generated by said reverse in the direction of the feed is restricted.
8 more elements
Dependencies are inferred from the claim text.