Title:
METHOD OF REMOVING FOLLOW-UP DELAY USING A DIGITAL SERVO SYSTEM IN A FULL-CLOSE FEEDBACK NC SYSTEM
Document Type and Number:
WIPO Patent Application WO/1988/002140
Kind Code:
A1
Abstract:
A method of removing follow-up delay using a digital servo system in a full-close feedback NC system, in which a position instruction is received from an NC controller (11), and in which a speed instruction (12) and a torque instruction (13) are supplied, in order to drive a table of a machine tool via a servo motor (14). A position detection value is produced from the servo motor. Further, a step (18) is provided wherein a correction instruction (19) having a correction quantity (K.DELTAX) and a correction time (1:Pg:K) (DELTAX denotes a play of the table, Pg denotes a position gain of the servo system, and K denotes a correction coefficient) is added to the position instruction (11) at a moment when the moving direction of the table is reversed so that the position error becomes zero, and wherein the addition is stopped at a moment when a position detection value of the servo motor becomes equal to a position detection value of the table. Thus, a machine tool which produces little error in position can be obtained.
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| JPH11277468 | CONTROL DEVICE FOR ROBOT |
| JPS61288213 | MOTOR ROTATION CONTROLLER |
Inventors:
OKUDA KANEMASA (JP)
Application Number:
PCT/JP1987/000680
Publication Date:
March 24, 1988
Filing Date:
September 16, 1987
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
G05D3/12; G05B19/19; G05B19/404; (IPC1-7): G05D3/12; G05B19/18
Foreign References:
| JPS60116004A | 1985-06-22 |
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