PID Tuning For DYNAMIXEL

When you command a DYNAMIXEL servo to move to a target position, the motor constantly compares its current position with the desired target. The difference is called the error. PID tuning controls how the motor responds to that error.

Without proper tuning, the servo might:

Slowly drift to the target

Overshoot and oscillate around the target

Vibrate or jitter once it reaches the target

With proper tuning, the servo:

Moves quickly but smoothly

Stops precisely at the target

Minimizes mechanical stress and noise

P

Proportional

Reacts to the current position error. Higher P gain usually increases responsiveness, but too much can cause overshoot or oscillation.

I

Integral

Corrects accumulated error over time. Useful for eliminating small steady-state error, especially under constant load.

D

Derivative

Adds damping by reacting to how fast the error changes. Helps reduce overshoot and improve settling near the target.

How to Tune DYNAMIXEL PID Gains

1. Start with default gains

Use the factory values as your baseline and test a simple back-and-forth move.

2. Tune P first

Increase P gain for faster response. Reduce it if overshoot or oscillation appears.

3. Add D for damping

Increase D gain gradually to reduce overshoot and improve settling.

4. Add I only if needed

Use a small amount of I gain to remove steady-state error under load.

5. Recheck motion profiles

Profile Velocity and Profile Acceleration affect motion quality too. Tune them together with PID.

Common Tuning Symptoms

Symptom	Likely Cause	Typical Fix
Sluggish response	P gain too low	Increase P slightly
Overshoot	P too high or D too low	Lower P or raise D
Oscillation near target	P too high or I too high	Reduce P and/or I
Small residual error	I gain too low	Add a small amount of I
Harsh start/stop	Profile acceleration too aggressive	Reduce Profile Acceleration

Key DYNAMIXEL Control Table Items for PID Tuning

Position D Gain (80) – Damping and overshoot control
Position I Gain (82) – Accumulated error correction
Position P Gain (84) – Main response strength
Profile Acceleration (108) – Motion acceleration shaping
Profile Velocity (112) – Motion speed shaping
Goal Position (116) – Commanded target
Present Position (132) – Actual feedback position

Important: Make sure to verify these addresses against your DYNAMIXEL model’s e-Manual page. Control table addresses may differ depending on the actuator family and operating mode.

Open ROBOTIS e-Manual

Recommended Tuning Workflow

Start with default gains → tune P first → add D for damping → add I only if needed → adjust Profile Velocity and Profile Acceleration → validate under real load

How Each Gain Affects Motion In DYNAMIXEL PID tuning, each gain influences motion differently. Use this quick visual guide when adjusting responsiveness, damping, and steady-state accuracy.
P	Responsiveness 85% • Strong effect Increasing P gain usually makes the servo react faster to position error, but too much can cause overshoot or oscillation.
I	Steady-State Error Correction 55% • Moderate effect I gain helps remove small residual error over time, especially when the joint is under constant load.
D	Damping / Overshoot Reduction 70% • High effect D gain adds damping as the actuator approaches the target, helping reduce bounce and overshoot.