| 摘要 |
PURPOSE:To make it possible to increase armature current omitting resistance for current detection by gaining an armature current feedback value for controlling a DC servomoter from both ends falling voltage of a thermal relay for overload protection. CONSTITUTION:In a DC servo-circuit the both ends falling voltage VTH of the thermal relay TH for overload protection connected in a series with an armature current Ia0 circuit is amplified A2 to gain the armature current feedback voltage VIF for controlling a DC servomotor M. And the speed instruction input voltage VREF is compared DF1 with the detection output VTG of the tacho-generator TG and after being compared DF2 with said VIF through the amplifier A1 it is put into the power amplifier A4 connected with the power source voltage Vin through a current error amplifier A3 to control the armature current Ia0. Thereby it is possible to increase the armature current omitting the current detection resistance. |
