How servo drives work

 Power devices generally use intelligent power module (IPM) as the core design of the driving circuit, IPM internal integration of the driving circuit, while with overvoltage, overcurrent, overtemperature, undervoltage and other fault detection protection circuit, in the main loop also added soft start circuit, to reduce the start of the process on the driver impact. The power drive unit first rectifies the input three-phase electricity or mains power through the three-phase full-bridge rectifier circuit to obtain the corresponding direct current. After a rectified three-phase electricity or mains power, and then through the three-phase sinusoidal PWM voltage inverter frequency conversion to drive the three-phase permanent magnet synchronous AC servo motor. The whole process of the power drive unit can be simply said to be the process of AC-DC-AC. The main topology circuit of the rectifier unit (AC-DC) is a three-phase full-bridge uncontrolled rectifier circuit.
With the large-scale application of servo system, servo drive use, servo drive debugging, servo drive maintenance are all more important technical topics of servo drives in today, and more and more industrial control technical service providers have conducted in-depth technical research on servo drives.
Servo drives are an important part of modern motion control and are widely used in automation equipment such as industrial robots and CNC machining centers. In particular, the servo drive used to control the AC permanent magnet synchronous motor has become a hot research topic at home and abroad. Currently, the current, velocity, position 3 closed-loop control algorithm based on vector control is commonly used in the design of AC servo drive. Whether the speed closed-loop design in the algorithm is reasonable or not plays a key role in the performance of the entire servo control system, especially the speed control performance.