One is the difference in control accuracy. The control accuracy of the AC servo motor is guaranteed by the rotary encoder at the back of the motor shaft. The pitch angle of the two-phase stepper motor is generally 3.6 degrees and 18 degrees, and the pitch angle of the five-phase hybrid stepping motor is 0.72 degrees and 0.36 degrees.

Second, the difference in low-frequency characteristics. Stepper motors are prone to low-frequency vibration at low speeds. Because the characteristics of the working principle of the stepping motor determine the phenomenon of low-frequency vibration, and this phenomenon is harmful and unprofitable for the normal operation of the machine, but the operation of the AC servo motor is very stable, even at very low At speed, it can maintain stability without vibration. That's because the AC servo system has a resonance suppression function, and there is a frequency analysis function inside the system, which will adjust it in a timely manner when it detects a resonance point in the machine.

There are also differences in moment-frequency characteristics, overload capacity, and operating performance and speed response performance. In the design process of the control system, it is necessary to comprehensively consider the control requirements, cost and other factors, and select a more appropriate control motor at the right time.