Servo stiffness

Servo stiffness a.k.a. control stiffness is one way to describe the tracking performance of a servo system.

For example servo stiffness can be easily visualized with position control servo: stiffness is motor's ability to counter any attempt to displace the axis from the setpoint position.

Stiffness has two easily distinguishable properties:

• static stiffness - how well the controller resists static loading of the actuator
• dynamic stiffness - how fast and strong controller resists dynamic loading of the actuator (i.e. instantaneous change of load)

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