Control system for a servomotor

A control system for controlling a servomotor in a speed controlling mode and in a position controlling mode, said system comprising:

• first signal producing means for producing an actual speed signal related to the actual speed of the servomotor;
• second signal producing means for producing a drive instructing signal to be applied to the servomotor;
• and
• control means for controlling signal transmission to the servomotor, said control means including an amplifying means for amplifying said actual speed signal, said speed instructing signal and said driving amount signal, wherein said control means is operable in the speed controlling mode to transmit, to the servomotor and at a first predetermined amplification rate, in accordance with said amplifying means, at least a signal formed by combining said actual speed signal from said first signal producing means and said speed instructing signal from said second signal producing means, and wherein said control means is operable in the position controlling mode to transmit, to the servomotor, a signal formed by combining first and second signals wherein the first signal is formed by amplifying, in accordance with said amplifying means, said driving amount instructing signal from said third signal producing means at a second predetermined amplification rate and wherein the second signal is formed by amplifying in accordance with said amplifying means said actual speed signal from said first signal producing means at a third amplification rate which is lower than the first and second amplification rates.

A control system for controlling a servomotor in a speed controlling mode and in a position controlling mode, said system comprising:

• first signal producing means for producing a speed controlling signal to be applied to the servomotor;
• second signal producing means for producing a driving amount controlling signal to be applied to the servomotor;
• and
• signal controlling means for controlling signal transmission to the servomotor, said signal control means including an amplifying means for amplifying said speed controlling signal and said driving amount signal, wherein said controlling means is operable in the position controlling mode to transmit to the servomotor at least said driving amount controlling signal at a first predetermined amplification rate, in accordance with said amplifying means, and wherein said controlling means is operable in the speed controlling mode to transmit to the servomotor said speed controlling signal at a second predetermined amplification rate in accordance with said amplifying means, and said driving amount controlling signal at a third amplification rate, in accordance with said amplifying means which is lower than the second amplification rate.