Understanding Servo Driver Parameters: A Technical Deep Dive

The Complexity of Servo Parameters

Modern servo drivers contain dozens of parameters controlling every aspect of motor behavior. Understanding these parameters is essential for achieving optimal motion control performance.

Control Mode Parameters

1. Position Control Mode

Commands specify target position; driver manages velocity and torque to reach it. Key parameters include Position Proportional Gain, Position Feedforward, Maximum Position Error, and Position Filter Time Constant.

2. Velocity Control Mode

Commands specify target velocity; driver manages torque to maintain speed. Key parameters include Velocity Proportional Gain, Velocity Integral Gain, Velocity Feedforward, and Maximum Torque Limit.

3. Torque Control Mode

Commands specify target torque; used in tensioning and winding applications. Key parameters include Torque Reference Gain, Maximum Torque Limit, and Current Limit.

Gain Parameters

Proportional Gain (P)

Formula: Output = Error x P
Effect: Higher = faster response, more overshoot
Typical Range: 1-1000 (varies by driver)

Integral Gain (I)

Formula: Output = Sum(Error) x I x dt
Effect: Eliminates steady-state error
Typical Range: 0-1000 (varies by driver)

Derivative Gain (D)

Formula: Output = d(Error)/dt x D
Effect: Provides damping, reduces overshoot
Typical Range: 0-1000 (varies by driver)

Filter Parameters

1. Position Filter

Smooths position command transitions using Moving Average Filter, Low-Pass Filter, or S-Curve Filter for smooth acceleration profiles.

2. Velocity Filter

Reduces velocity command noise with configurable cutoff frequency and filter order.

3. Notch Filters

Eliminates resonance at specific frequencies with configurable center frequency, bandwidth, and depth.

Protection Parameters

Current Limits

• Peak Current Limit: Maximum instantaneous current
• Continuous Current Limit: Maximum sustained current
• RMS Current Limit: Average power dissipation limit

Optimization Strategies

For High-Speed Positioning

• Increase position loop bandwidth
• Reduce unnecessary filtering
• Use velocity feedforward
• Enable notch filters for resonance

For Precision Tracking

• Increase position loop gain
• Enable integral action
• Reduce position command smoothing
• Use high-resolution encoder

LEADSHINE Parameter Features

LEADSHINE servo drivers offer factory default parameter sets, parameter backup/restore via USB, parameter comparison tools, auto-save functionality, and comprehensive parameter descriptions.

Conclusion

Understanding servo driver parameters enables precise system optimization. Start with well-documented parameters, use auto-tuning as a baseline, then refine manually for your specific application.