... x 120 mm; The power supply: singel-phase AC220V ,50 HZ,< 50 W. 3. Main composition: dc servo motor, rotational speed ... and application of dc servo motor, understand and application of dc servo drive , dc servo manual control experiment, dc servo typical speed closed- ... loop control application experiment, complete the analog circuit realize dc servo motor speed closed-loop adjusting loop (P, I, D) ...