What is the meaning of “Ratio of Load Inertia to Servo Motor Inertia”?

Ratio of load inertia to servo motor inertia: (J_load /J_motor)
J_load: Load inertia J_motor: Motor rotor inertia

When selecting the servo drives and motors that the user want to use, the user not only should consider the motor torque and rated speed, but also need to know the ratio of load inertia to servo motor inertia.

Then, the user can select the proper motor that is correctly matched for the servo drive according to the actual requirements of the connected machine (load condition) operation and the quality and quantity requirements for materials processing and manufacturing.

When perform tuning and trial run, setting (J_load /J_motor) correctly is the most important / essential for optimizing the performance of the mechanical system and servo system and make them work efficiently.