beepmotor

Stepper motor’s control is open loop control; it is easy to emerge the phenomenon of stall and lose the load step when the start frequency is too high or the loaded is too bigger. Therefore, to ensure the accuracy of the control, you should solve the handle up and spin-down problem well. AC servo drive system is closed loop control, the motor driver can directly sampled the motor encoder feedback signal, Internal structure compose of the position loop and speed loop, so it generally does not appear lost step or stepper motor overshoot phenomenon, the control performance is more reliable. The speed response performance between stepper and servo motor also are different, Stepper motor needs 200 ~ 400 ms accelerates from zero to operating speed (typically several hundred per minute, rpm). AC servo system has better acceleration performance.