How to Correctly Choose Servo Motors and Stepper Motors

It mainly depends on the specific application. It depends on the characteristics of the load (such as horizontal or vertical load, etc.), torque, inertia, speed
, accuracy, acceleration and deceleration requirements, upper control requirements (such as requirements for port interface and communication), and whether the main control method
is position, torque or speed, whether the power supply is DC, AC or battery, voltage range, etc. Based on this,
the model of the motor and the matching driver or controller is determined.

Servo motor Stepper motor

Comparison of the specific characteristics of the two:
Torque range:
small and medium torque (generally below 20Nm) small, medium, large, full range

Speed ​​range:
low (generally below 1000RPM) high (up to 5000RPM), DC servo motor can reach 10,000~20,000 rpm

Control mode:
mainly position control. Diversified control modes, position/speed/torque/bus control

Smoothness:
Vibration at low speed (improved by subdivision drive) Good, smooth operation

Accuracy:
Generally low (higher with microcontroller) High (depends on the resolution of the feedback device)

Torque-frequency characteristics:
The torque drops quickly at high speeds. The torque characteristics are good and the characteristics are relatively hard.

Overload characteristics:
No overload capability, will lose step when overloaded. Can be overloaded 3~10 times (short time)

Feedback mode:
mostly open-loop control (can also be connected to encoder to prevent step loss) Closed-loop mode, encoder feedback

Feedback type:
No feedback required Photoelectric rotary encoder Rotary transformer type

Response speed:
Normal Fast

Vibration resistance:
Good Average (resolver type can withstand vibration)

Temperature rise:
High operating temperature, average

Maintainability:
basically maintenance-free, good

Price:
Low High