Servo Tuning Basics for Smooth Motion

Achieving smooth motion in servo systems starts with understanding three key gains: proportional, integral, and derivative. Tuning these correctly eliminates overshoot, oscillation, and steady-state error.

Proportional gain (Kp) determines how aggressively the system responds to position error. Higher Kp makes the system stiffer but can cause overshoot and even instability if set too high. Start with a low Kp and increase until you see slight overshoot, then back off slightly.

Integral gain (Ki) addresses steady-state error by integrating past errors. However, too much Ki leads to integral windup and slow oscillations. Introduce Ki after setting Kp, using just enough to eliminate long-term position error without causing low-frequency hunting.

Derivative gain (Kd) adds damping to reduce overshoot and settling time. It acts on the rate of error change, but it amplifies noise. Use Kd sparingly and after establishing stable Kp and Ki values. A systematic approach: tune Kp first, then add Ki, then cautiously add Kd. Test with step commands and observe response curves. Adjust iteratively until motion is smooth and crisp.

#MotionControl# #MotorSelection#