Servo system structure and classification - Solutions - Huaqiang Electronic Network

SMD aluminum electrolytic capacitor

Single chip microcomputer STM32L151CCU6

Photocoupler

From the basic structure, the servo system is mainly composed of three parts: controller, power drive, feedback device and motor (Figure 1). The controller adjusts the control amount according to the difference between the given value of the numerical control system and the actual running value detected by the feedback device; the power driving device acts as the main circuit of the system, and on the one hand, the electric energy in the power grid is applied to the electric motor according to the magnitude of the control amount. On the other hand, the magnitude of the motor torque is adjusted. On the other hand, the constant voltage constant frequency power supply is converted into the alternating current or direct current required by the motor according to the requirements of the motor; the motor is driven by the mechanical operation according to the power supply.

The main components in Figure 1 vary widely, and any change in any of them can constitute different kinds of servo systems. According to the type of the drive motor, it can be divided into DC servo and AC servo; according to the different methods of controller implementation, it can be divided into analog servo and digital servo; according to the number of closed loops in the controller, it can be divided into Open loop control system, single loop control system, dual loop control system and multi-loop control system.