Speed control apparatus
AssigneeFanuc Corporation
InventorTetsuro Sakano
Life of this patent
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Abstract
A speed control apparatus according to the present invention includes a pulse generator for generating a number of pulses proportional to an angle of rotation of a servomotor, a speed signal generator for converting the frequency of the pulses into a voltage indicative of an actual speed of the servomotor in order to feed back the voltage through negative feedback, a detector for detecting reversal of the direction of rotation of the servomotor, a positional change detector for detecting the change in a position of the servomotor after the reversal of the direction of rotation of the servomotor by counting the pulses produced by the pulse generator, and a circuit for lowering the voltage indicative of an actual speed until the position of the servomotor has changed beyond a predetermined amount.
Claims10
A speed control apparatus for a servomotor, comprising:
- a position detector for generating positional information proportional to an angle of rotation of the servomotor;
- first means for generating speed information based on the positional information in order to feed back said speed information as actual speed information through negative feedback;
- second means, operatively connected to said position detector, for detecting reversal of the direction of rotation of the servomotor;
- third means, operatively connected to said second means, for detecting a change in the position of the servomotor based on the positional information including the direction of rotation of the servomotor;
- and
- fourth means, operatively connected to said first, second and third means, for substantially blocking said speed information until the position of the servomotor is changed beyond a predetermined amount.
Dependencies are inferred from the claim text.