Servo control system capable of improving processing accuracy
AssigneeFanuc Corporation
InventorsTadashi OKITA, Yukio Toyozawa, Kazuomi Maeda, Naoto Sonoda
Life of this patent
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Abstract
A servo control system capable of using an angle-based synchronization learning control, even when a reference position is not given, while maintaining the advantage of the angle-based synchronization method. The servo control system has X-, y- and z-axes servo controllers, each configured to control x-, y- and z-axes servomotors, respectively. Each of x- and y-axes servo controllers has a reference signal generating part configured to generate a reference signal which monotonically increases or varies in one direction, based on the position command of each axis transmitted from a higher-level controller.
Claims5
A servo control system of an industrial machine or a machine tool for processing a processed shape constituted by an arc, a polygon or a combination thereof, by means of cooperative operation of a plurality of axes including two mutually orthogonal axes, the servo control system comprising:
- a higher-level controller configured to transmit position commands for processing the processed shape to a servomotor of each of the plurality of axes;
- and
- a plurality of servo controllers, each configured to drive the servomotor of each axis based on the position command so as to move a driven body,
- the servo controllers for at least the two mutually orthogonal axes comprising:
- a position detecting part configured to detect the position of the servomotor or the driven body;
- a positional deviation calculating part configured to calculate a deviation between the position command and a detected position feedback of the servomotor, at every predetermined sampling period of time;
- a reference signal generating part configured to generate a reference signal which is varied in one direction, based on the position command or the position feedback of the own axis or another axis;
- and
- a learning controlling part configured to carry out learning control based on the reference signal, the position command and the positional deviation.
Dependencies are inferred from the claim text.