The main difference between stepper motor and servo motor

The stepper motor converts the pulse signal into mechanical motion, and controls the number of pulses to achieve accurate positioning. At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, so as to achieve high speed. the goal of.

Servo motor refers to controlling the operation of mechanical components in the servo system, which can control the speed, the position accuracy is very accurate, and the voltage signal is converted into torque and speed to drive the control object.

The main differences between stepper motor and servo motor are:

01 Control accuracy: the more phases and beats of the stepping motor, the higher its accuracy. The servo motor is based on the built-in encoder, and the more scales of the encoder, the higher the accuracy.

02 Control methods: the stepping motor is open-loop control, and the servo motor is closed-loop control.

03 Low-frequency characteristics: stepping motors are prone to low-frequency vibrations at low speeds. The servo motor runs very smoothly and does not vibrate even at low speeds.

04 Torque-frequency characteristics: the output torque of the stepping motor will decrease with the increase of the speed, and the AC servo motor has a constant torque output. 

05 Overload capacity: AC motors have strong overload capacity, but stepper motors basically do not have super overload capacity.

06 Running performance: stepper motors may lose steps or stall when the starting frequency is too high or the load is too large, and overshooting may occur when the speed is too high when the stop is too high. AC servo can directly feed back signals to the motor encoder, and the control performance is better. for reliable.

07 Acceleration performance: the stepper motor needs hundreds of milliseconds to start, while the acceleration performance of the AC servo system is better, generally only a few milliseconds, which can realize fast start.