Feedback controller for NC controlled machine tools
First Claim
1. A feedback controller for NC controlled machine tools comprising:
- (a) a driving motor driven by a torque signal to drive a work to be controlled for causing the work to have a current position and a current velocity at each instant;
(b) a position detector that detects the current position of the work;
(c) a velocity detector that detects the current velocity of the work;
(d) a position director that indicates a predetermined desired current position of the work;
(e) a feedback position adjustor for comparing the predetermined desired current position of the work and the current position of the work that is detected by the position detector for producing a desired current velocity of the work proportional to the difference between the compared positions;
(f) a feedback velocity adjustor that produces a first torque signal component by comparing the desired current velocity and the current work velocity detected by the velocity detector, the first torque signal component being proportional to the difference between the compared velocities;
(g) a torque compensation signal generator connected to the velocity detector for generating a second torque signal component which is a selected function of the current work velocity detected by the velocity detector; and
(h) means for combining the first and second torque signal components to produce the torque signal in such that the presence of the second torque signal component in the torque signal reduces the difference between the current work position detected by the position detector and the desired current position of the work indicated by the position director.
1 Assignment
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Accused Products
Abstract
In a feedback controller for NC controlled machine tools, the position and the velocity of a work is detected and compared with the desired position. By this comparison, the work velocity is calculated and compared with the current velocity, which determines torque of a driving motor. A torque compensation signal generator, receiving the current velocity, generates a compensation signal according to a predetermined velocity/torque function. The signal is composed with a torque signal passed to a driving motor, and torque compensation is performed. A periodic reaction detector detects periodic fluctuation of the work caused by periodic load fluctuation, and a torque compensation direction causes a signal generator to suppress the fluctuation at desired occasions.
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Citations
4 Claims
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1. A feedback controller for NC controlled machine tools comprising:
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(a) a driving motor driven by a torque signal to drive a work to be controlled for causing the work to have a current position and a current velocity at each instant; (b) a position detector that detects the current position of the work; (c) a velocity detector that detects the current velocity of the work; (d) a position director that indicates a predetermined desired current position of the work; (e) a feedback position adjustor for comparing the predetermined desired current position of the work and the current position of the work that is detected by the position detector for producing a desired current velocity of the work proportional to the difference between the compared positions; (f) a feedback velocity adjustor that produces a first torque signal component by comparing the desired current velocity and the current work velocity detected by the velocity detector, the first torque signal component being proportional to the difference between the compared velocities; (g) a torque compensation signal generator connected to the velocity detector for generating a second torque signal component which is a selected function of the current work velocity detected by the velocity detector; and (h) means for combining the first and second torque signal components to produce the torque signal in such that the presence of the second torque signal component in the torque signal reduces the difference between the current work position detected by the position detector and the desired current position of the work indicated by the position director. - View Dependent Claims (2, 3, 4)
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Specification