How to correctly select servo motors and stepper motors

servo motor

stepping motor

Comparison of specific characteristics between the two:

Torque range:

Small and medium-sized torque (generally below 20Nm)

Small, medium, large, full range

Speed range:

Low (generally below 1000RPM)

High (up to 5000RPM), with DC servo motors up to 10-20000 RPM

Control method:

Mainly based on position control

Diversified control methods, position/speed/torque/bus control

Smoothness:

Vibration at low speeds (improved by subdividing the driver)

Okay, smooth operation

Precision:

Generally lower (higher when driven by subdivision)

High (depending on the resolution of the feedback device)

Moment frequency characteristics:

Fast torque decrease at high speeds

Good torque characteristics, with hard characteristics

Overload characteristics:

No overload capacity, may lose step when overloaded

Capable of 3-10 times overload (short time)

Feedback method:

Most of them are open-loop control (can also be connected to encoder to prevent loss of step)

Closed loop mode, encoder feedback

Feedback type:

May I ask for no feedback

Optoelectronic rotary encoder and rotary transformer type

Response speed:

same as

fast

Vibration resistance:

good

General (rotary transformer type can withstand vibration)

Temperature rise:

High operating temperature

same as

Maintainability:

Basically maintenance free

preferably

Price:

low

higher