Stepper Motor Coupling Selection

Stepper vs servo coupling difference

Steppers have lower torque (usually within a few N·m), vibration, and lower speed; servos have higher torque and speed and need high rigidity with zero backlash. So steppers suit jaw couplings (damping), servos suit diaphragm couplings (rigidity).

Selection points

① Torque: rated ≥ 1.3× stepper peak torque; ② Bore: typically 3–14 mm; ③ Damping: the TPU spider of a jaw coupling absorbs the stepper's low-frequency vibration.

Recommendation

Low-torque light-duty steppers (3D printing, small automation) → CRO-CFC jaw coupling; higher precision → CRO-CS diaphragm coupling. Bore from 3 mm.