Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1988-09-21
1990-01-16
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318571, 318569, G05B 1910
Patent
active
048945943
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a servo system speed control apparatus, more particularly, to an apparatus for controlling a speed of a servo system by using a computer.
2. Background Art
Conventionally, a servo system speed control apparatus using a computer is used, for example, with a computerized numerical control apparatus (CNC apparatus), an industrial robot, and the like.
For example, when a workpiece is processed by a CNC apparatus, a suitable speed for processing the workpiece is designated to each block at which a specific process is to be carried out on the workpiece. For example, when an inner portion of the workpiece is to be cut at a right angle, a feed speed for cutting a corner portion of the workpiece is reduced in relation to a feed speed for a straight portion of the workpiece, so that an overload of the cutting tools is avoided and a cut surface of the workpiece is improved, and further, the corner portion of the workpiece is cut with a greater accuracy.
Note, in a conventional servo system speed control apparatus, first a speed designated to a block is read and then a speed of the servo system is changed to the designated speed. Therefore, in the conventional servo system speed control apparatus, a problem arises in that, if a block length for decelerating the speed is insufficient, the servo system speed cannot be lowered to the designated speed of the next block.
DISCLOSURE OF THE INVENTION
The object of the present invention is to perform a speed control of the servo system, more particularly, to suitably control a deceleration of the servo system.
According to the present invention, there is provided a servo system speed control apparatus for controlling the speed of a servo system by using a computer, characterized in that the speed control apparatus of the servo system comprises: a block speed pre-read means for previously reading a speed value designated to a plurality of blocks; a deceleration start position calculating means, at the start position of the previously read blocks, for calculating a deceleration start position to maintain the servo system at a speed lower than the designated speeds for the blocks; and a servo system deceleration means for lowering the speed of the servo system from the calculated deceleration start position.
According to the servo system speed control, apparatus having the above described configuration of the present invention, first a speed value designated for a plurality of blocks is previously read by the block speed pre-read means, and then the speed of the servo system is maintained at a speed lower than designated speeds of the blocks at the start position of the previously read blocks by the deceleration start position calculating means.
Furthermore, the speed of the servo system is lowered from the calculated deceleration start position by the servo system deceleration means. Consequently, the servo system speed control apparatus can maintain a servo system speed that is lower than the designated speeds of all blocks, and control a deceleration of the servo system with a high degree of accuracy.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing an example of the control command of the CNC apparatus;
FIG. 2 is a diagram showing an example of a speed change of a servo system controlled by a conventional speed control apparatus of a servo system;
FIG. 3 is a schematic block diagram showing a CNC apparatus using a servo system speed control apparatus of the present invention;
FIG. 4 is a diagram showing one example of a speed change of a servo system controlled by a servo system speed control apparatus of the present invention;
FIG. 5 is a diagram showing a comparison of a speed change of a servo system controlled by the servo system speed control apparatuses of the present invention and of a conventional type; and,
FIG. 6 is a flow chart showing an example of a control operation based on the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
First, the problems of a conventional
REFERENCES:
patent: 3941987 (1976-03-01), Tack, Jr.
patent: 4757457 (1988-07-01), Matsumoto
Arimoto Nozomu
Fujibayashi Kentaro
Kawamura Hideaki
Bergmann Saul M.
Fanuc Ltd
Shoop Jr. William M.
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