Performance comparison of servo motor and stepper motor

a. Control accuracy: the more phases and beats of the stepper motor, the higher the accuracy. The servo motor takes the block from the built-in encoder. The more scales of the encoder, the higher the accuracy;

b. Low frequency characteristics: The stepper motor is prone to low frequency vibration at low speed. When it operates at low speed, damping skills or subdivision skills are generally used to defeat the low frequency vibration phenomenon. The servo motor works very smoothly, even at low speed. show vibration;

c. Torque frequency characteristics: the output torque of the stepper motor decreases with the increase of the speed, and it will drop sharply at high speed. The servo motor has a constant torque output within the extra speed, and a constant power output at the extra speed;

d. Overload capability: Stepper motor does not have overload capability, and servo motor has strong overload capability;

e. Operation function: The control of the stepper motor is open-loop control. If the starting frequency is too high or the load is too large, it is easy to lose steps or stall. When the speed is too high, it is easy to cause overshoot. The communication servo drive system is closed-loop control. , the driver can directly sample the feedback signal of the motor encoder, and the azimuth loop and the speed loop are formed internally. Generally, the phenomenon of step loss or overshoot of the stepping motor will not occur, and the control function is more reliable;

f. Speed response performance: It takes hundreds of milliseconds for the stepper motor to accelerate from standstill to operating speed, while the acceleration function of the communication servo system is better, generally only a few milliseconds, which can be used for control occasions requiring rapid start and stop.