The main circuit of ac servo drive and frequency converter is basically the same, the main difference is in the control circuit.

Compared with ordinary frequency converters, the control loop of ac servo drive is more complex, and the feedback data to receive is more, and the data to calculate is more.

The performance difference between AC servo driver and inverter is shown in the following table:

In the future, the functions of AC servo drives and frequency converters may tend to be unified. It is better to have different functions in the segmented fields. It is better to select functions according to the control needs, meet the requirements and have an advantage in price.