The function of the servo motor is to convert the input voltage signal (i. e., the control voltage) into the angular displacement or angular speed output on the axis, often as an actuator in the automatic control system, so the servo motor is also known as the executive motor, its biggest feature is that the rotor rotates immediately when there is a control voltage, and the rotor is immediately stopped when there is no control voltage.
The rotor inside the servo motor is a permanent magnet. The U / V / W three-phase electricity controlled by the driver forms the electromagnetic field, and the rotor rotates under the action of this magnetic field. The accuracy of the servo motor is determined by the accuracy of the encoder (the number of lines).
Precision: realize the closed loop control of position, speed and torque; overcome the problem of stepping motor;
Speed:good high-speed performance .
Adaptability: strong overload resistance, can withstand the load of three times the rated torque, especially suitable for instantaneous load fluctuations and quick start.
Servo motor is an important part of CNC servo system and the execution element of speed and track control. The servo system motors commonly used in CNC machine tools are stepping motor, DC servo motor, AC servo motor and linear motor.