Servo vs Stepper Motor for CNC Router Axes
Servo vs stepper motor in short: stepper motors are cheaper and simple but can lose steps under overload and lose torque at high speed. Servo motors use encoder feedback, hold torque up to their rated speed and alarm instead of losing position. Closed loop (hybrid) steppers sit in between. For production routers, laser and plasma machines, servo vs stepper usually favours servo.
Servo vs Stepper Motor for CNC Router: overview
Axis motors decide how fast and how reliably a router positions the tool. Start with the axis load and the rapid speed you want, then compare the motor types below.
Servo vs stepper motor comparison
| Factor | Stepper (open loop) | Closed loop / hybrid | AC servo |
|---|---|---|---|
| Feedback | None | Encoder | High-resolution encoder |
| Lost steps | Possible | Corrected | No; alarms on error |
| Torque vs speed | Falls quickly with speed | Better | Flat to rated speed |
| Heat | Runs warm even at rest | Lower | Low at rest |
| Cost | Lowest | Medium | Highest |
| Typical use | Hobby and small routers | Mid-size routers | Production routers, laser, plasma |
Servo vs Stepper Motor for CNC Router: frequently asked questions
Servo vs stepper motor for CNC: which is better?
Servo motors are better for speed, reliability and heavy loads because encoder feedback prevents lost position and torque stays high at speed. Stepper motors are good enough for small, light routers on a budget. A closed loop stepper is a sensible middle choice for mid-size routers.
What size servo motor do I need for a CNC router?
Light router axes commonly use 400 W servos; typical 1300 x 2500 mm router gantries often use 750 W per side; heavy or fast gantries use 1 kW to 1.5 kW. Add a planetary gearbox to multiply torque before choosing a larger motor.
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