Servo drives, also known as "servo controllers" and "servo amplifiers", are a kind of controller used to control servo motors, which is similar to the role of inverters acting on ordinary AC motors, which is a part of the servo system and is mainly used in high-precision positioning systems. Generally, the servo motor is controlled by three ways: position, speed and torque to achieve high-precision transmission system positioning, which is a high-end product of transmission technology.