Servo selection starts with mechanical calculation: load inertia, required torque and the speed/acceleration profile. Wrong sizing causes vibration, heating and position error.
- Inertia matching — load/motor inertia ratio (typically ≤ 10:1)
- Torque — continuous and peak torque needs
- Feedback — incremental vs absolute encoder (homing requirement)
- Communication — synchronized-axis support via EtherCAT/PROFINET
A high inertia ratio (e.g. 30:1) makes tuning hard and causes resonance; if needed, a gearbox reduces the ratio.
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