What is a servo?
The word Servo Servo comes from the Latin "servus", which means that the servant acts according to the instructions of the master and works faithfully and quickly.
What is a servo system?
The servo system, also known as the on-the-ground system, is a feedback control system used to accurately follow or reproduce a certain process. The servo system is an automatic control system that enables the output controlled quantity of the object's position, orientation, state, etc. to follow any change of the input target (or given value). Its main task is to amplify, transform and regulate the power according to the requirements of the control command, so that the torque, speed and position output by the drive device can be controlled very flexibly and conveniently. The servo system consists of three parts: controller, power drive device and motor.
What is a servo drive?
Servo drives (servo drives), also known as "servo controllers" and "servo amplifiers", are a type of controller used to control servo motors. Its function is similar to that of a frequency converter on an ordinary AC motor. It is a part of the servo system and is mainly used in high-precision positioning systems. Generally, the servo motor is controlled by three methods of position, speed and torque to achieve high-precision positioning of the transmission system. It is currently a high-end product of transmission technology.
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working principle
At present, mainstream servo drives use digital signal processors (DSP) as the control core, which can realize relatively complex control algorithms and realize digitization, networking and intelligence. Power devices generally adopt the drive circuit designed with the intelligent power module (IPM) as the core. Start the circuit to reduce the impact on the driver during the start-up process.
The power drive unit first rectifies the input three-phase power or mains power through a three-phase full-bridge rectifier circuit to obtain corresponding DC power. After the rectified three-phase electricity or mains electricity, the three-phase permanent magnet synchronous AC servo motor is driven by the frequency conversion of the three-phase sinusoidal PWM voltage type inverter. The whole process of the power drive unit can be simply said to be the process of AC-DC-AC. The main topological circuit of the rectification unit (AC-DC) is a three-phase full-bridge uncontrolled rectification circuit.
