The ac servo motor can accurately achieve displacement control is mainly because of the encoder. The encoder can check the pulse between the drive and the motor motor, and if so, allowing the motor to work strictly in accordance with the PLC instructions, whether it is displacement movement, torque change, or speed change.
Servo "is" follow " control signal meaning, ac servo motor can achieve accurate control, can control as much to turn. And it also has a feedback device, which can achieve a closed loop, that is, the encoder can feedback whether the transfer to the quantity, so the servo motor accuracy is better. And the ordinary motor does not have this function, the ordinary motor is basically an electric turn, no power to stop.
AC servo motor with encoder is widely used in robotics, automobiles, tools, industrial control, automation, aerospace and other fields.