Servo motor , also known as the implementation of the motor, is the servo system to control the operation of mechanical components of the engine, is a subsidy motor indirect transmission. It can make the control speed, position accuracy is very accurate, the voltage signal can be converted into torque and speed to drive the control object. The servo motor can be divided into DC servo motor and AC servo motor.
AC servo motor is also composed of stator and rotor. The structure of the stator is basically similar to that of a capacitive phase split single-phase asynchronous motor with two windings of 90 ° different from each other, one for the field winding Rf, which is always connected to the AC voltage Uf; Control winding L, connection control signal voltage Uc. So AC servo motor, also known as two servo motor.
The rotor inside the servo motor is a permanent magnet, the driver controls the U / V / W three-phase electric field to form an electromagnetic field, the rotor rotates under the action of the magnetic field, and the motor comes with the encoder feedback signal to the Servo driver, it according to the feedback value and the target Value to compare, adjust the rotor rotation angle.
The working principle of the AC servo motor is similar to that of the two-phase asynchronous motor. But because it is in the CNC machine tool as an actuator, the AC signal is converted to the axis of the angular displacement or angular velocity, so the speed of the rotor speed can reflect the control signal phase, no control signal when it does not rotate.