Servo Drive Selection
Servo axes are chosen when speed alone is not enough and the machine needs controlled position, synchronisation, or dynamic response. Selecting the right servo drive means evaluating peak torque, continuous torque, reflected inertia, encoder type, communication protocol, and the motion architecture around the axis, not just picking the nearest motor power rating.
- Cut-to-length and registration applications in packaging machines.
- Pick-and-place gantries and rotary indexing systems.
- Synchronised multi-axis assembly machines.
- Machines with demanding acceleration and position repeatability requirements.
The drive and motor must handle the full motion profile, including acceleration, deceleration, dwell, and regenerative events. Engineers also validate encoder compatibility, STO requirements, cable set selection, and whether motion is coordinated by the PLC or a dedicated controller. Axis mechanics matter too, because gearbox ratio, coupling stiffness, and reflected inertia can make or break the system.
- Choosing based on nominal kW while ignoring peak torque demand and cycle dynamics.
- Accepting a poor inertia match that later creates tuning instability.
- Forgetting the mechanical transmission when sizing motor speed and torque.
- Selecting feedback or fieldbus options that do not match the chosen motion platform.
- Treating servo selection separately from cable routing, braking, and panel thermal design.
ClusterVise keeps servo sizing connected to the overall machine architecture. When a cycle-time target or axis duty changes, the platform can surface the impact on drive class, thermal load, cable selection, and supporting documentation instead of leaving the servo decision isolated inside a spreadsheet or vendor configurator.
| Item | Selection | Basis |
|---|---|---|
| Move requirement | 300 mm index in 0.35 s | Cycle-time-driven profile |
| Axis load | Moderate inertia belt axis | Requires repeatable stop position |
| Recommended platform | 1 kW servo set | Peak torque margin included |
| Network | EtherCAT | Integrated with motion controller |
| Safety | STO + holding brake as needed | Controlled safe stop |
