The difference between stepping motor and AC servo motor

by:V&T Technologies     2020-01-08
The difference between stepping motor and AC servo motor is that stepping motor is already a device capable of controlling discrete motion. Of course, it is essentially related to modern digital control technology. At present, it has appeared in the domestic digital control system, and the range of use of stepping motors is very wide. With the emergence of all-digital AC servo systems, AC servo motors are increasingly used in all-digital control systems. In order to adapt to the development trend of all-digital control system, stepping motor or all-digital AC servo motor is mostly used as Executive Motor in motion control system. Although the two are indeed very similar in control methods (Pulse train and direction signal) However, there is a big difference in the performance and application of the motor. Now let's compare the performance of the two. Xiao Bian now gives you a detailed introduction to the six major differences between stepping motor and servo motor: 1. Different control precision; Two. Different low frequency characteristics; The motor is prone to low frequency vibration at low speed. The vibration frequency is related to the load and the performance of the driver. It is generally believed that the vibration frequency is half of the no-load take-off frequency of the motor. Three. The difference of moment frequency characteristics; The output torque of the motor decreases with the increase of rotation speed and decreases sharply at higher rotation speed. Four. Different overload capacity; Stepping motors generally do not have overload capability. AC servo motor has strong overload capability. Five. Different operating performance; The control of the motor is open-loop control. If the starting frequency is too high or the load is too large, it is easy to lose step or block rotation, and if the rotating speed is too high, it is easy to overshoot, therefore, in order to ensure its control accuracy, the problem of speed increase and decrease should be handled well. Six. Different speed response performance; Stepping motor accelerates from rest to working speed (Generally hundreds of revolutions per minute)Need 200 ~ 400 milliseconds. Based on the points described in the above small series, we will find that AC servo system may be superior to stepping motor in many aspects of high performance. However, stepping motors are often used as execution Motors in some occasions where the requirements are not very high. Therefore, in the design process of the full digital control system, we need to comprehensively consider various factors such as control requirements and costs, and properly select the appropriate control motor. Do you need to know about large torque deceleration stepping motor? Related reading: Factors affecting deceleration stepping motor, the market size of deceleration stepping motor is generally on the rise. TAG stepping motor, AC servo motor
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