The difference between AC servo motors and DC servo motors

The main difference between AC servo motors and DC servo motors is the use of different driving power sources.
DC servo motors generally use brushed motors, while AC servo motors typically use brushless motors.

DC servo motors require regular replacement of carbon brushes, which incurs additional costs for replacement and maintenance, and the wear of carbon brushes can affect the performance and accuracy of the motor.

The AC servo motor does not have this problem due to its brushless structure.

In addition, AC servo motors usually have higher efficiency and lower heat generation during operation, because the magnetic field distribution of AC motors is more uniform and torque fluctuations are smaller. DC servo motors may have some friction losses and heating problems due to the presence of carbon brushes and commutators.

In addition, AC servo motors also have higher dynamic performance and response speed. This is because AC motors can decouple torque and magnetic field through vector control technology, making it easier to achieve high-speed and precise control. Of course, AC servo motors and DC servo motors also have some similarities.

For example, they require precise positioning and control. They also need to be used in conjunction with corresponding drivers to achieve motor control and adjustment.