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Can AC servo motor be controlled by frequency converter?

2023-05-20 13:28:19

Due to the difference in performance and function between frequency converter and servo, their applications are not the same, so they are not allowed


1. In the situation of speed control and torque control, frequency converter is generally used, and position feedback signal is added in the upper position to form a closed-loop position control with frequency conversion, the accuracy and response are not high. At present, some frequency conversion also accept the pulse sequence signal to control the speed, but it seems that they can not directly control the position.


2. In the situation with strict position control requirements, only servo can be used to achieve. In addition, the response speed of servo is far greater than that of frequency conversion. Servo control is also used in some occasions with high requirements for speed accuracy and response. Servo can be used in almost all occasions where frequency conversion control can be used.


The key points are two points: one is that the price servo is far higher than the frequency conversion; the other is the power reason: the largest frequency conversion can achieve hundreds of kW, or even higher, and the maximum servo is dozens of kW. The basic concept of servo is accurate, accurate and fast positioning. Frequency conversion is a necessary internal part of servo control, and frequency conversion also exists in servo driver


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