All component comparisons
Stepper Motor vs Servo Motor
Stepper Motor and Servo Motor compared — what each is better at, and which one the job actually calls for.
A stepper moves in fixed increments and holds position without any feedback, which makes it simple and genuinely precise at low speed — but it draws full current standing still, loses torque as it speeds up, and if it is overloaded it skips steps silently, so your position is quietly wrong with nothing to tell you. A servo closes the loop with an encoder, so it cannot lose position and holds torque at speed; you pay in cost and in tuning.
What each one is
Stepper Motor
A motor that moves in precise, discrete steps when energized in sequence, ideal for position control without sensors.
Servo Motor
A motor that can be precisely positioned at specific angles using a control signal. Commonly used in robotics, RC vehicles, and automation.
Key specs
Stepper Motor
- Step angle(degrees (°))
- Degrees per step (common: 1.8° = 200 steps/rev). Smaller = more precision.
- Holding torque(N·m or kg·cm)
- Torque when energized but not moving. Must exceed load torque.
- Voltage rating(V)
- Nominal voltage per coil. Higher voltage = faster response (with driver).
- Current rating(A)
- Max current per coil. Driver must supply this.
- Steps per revolution(steps/rev)
- Total steps for full rotation (e.g., 200, 400, 1000).
Servo Motor
- Operating voltage(V (Volts))
- Nominal voltage required for operation (typically 4.8V-6V for hobby servos).
- Stall torque(kg-cm)
- Maximum torque the motor can produce when stalled. Higher values mean more strength.
- Speed(s/60°)
- Time to rotate 60 degrees at no load. Lower values mean faster movement.
- Rotation range(degrees)
- Angle range the servo can move (typically 0-180° for standard servos).
- Weight(g (grams))
- Weight of the servo motor, important for mobile applications.
Types you will meet
Stepper Motor
- Variable reluctance
- Permanent magnet
- Hybrid
- Bipolar
- Unipolar
- Linear
- Can-stack
Servo Motor
- Standard hobby servo
- Continuous rotation servo
- Digital servo
- High-torque servo
- Micro servo
- Metal gear servo
- Waterproof servo
How to choose
Stepper Motor
1) Determine required torque and speed. 2) Choose step angle for precision needs. 3) Match voltage/current to driver. 4) Consider size/weight constraints. 5) Bipolar for more torque, unipolar for simpler wiring.
Servo Motor
1) Determine required torque based on load. 2) Check voltage compatibility with your controller. 3) Consider speed requirements. 4) Select appropriate size/weight for your application. 5) Choose metal gears for durability or plastic for lower cost.
How each one fails
Stepper Motor
Coil burnout (overheating from excessive current), gear wear (reduced torque/noise), shaft binding (mechanical overload), missed steps (load exceeds torque).
Servo Motor
Gear wear (stripping teeth), motor burnout from voltage spikes, potentiometer failure (jitter or unresponsive), connector wire breakage. Signs: clicking noise, limited movement, no response to signal.
Full reference for each part
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