Servo drives (servodrives) also known as the "servo amplifiers", "controller", a controller is used to control servo motors, is part of the servo system, which works like a frequency inverter acting on General Motors, mainly used in high-precision positioning systems. Usually through position, speed and torque in three ways to control servo motors, locate the high-precision drive systems, is now the transmission technology of high-end products. Servo drives are widely used in the field of injection molding machines, textile machinery and other fields.