The AC servo motor is a two-phase AC asynchronous motor. Its stator is equipped with two windings spaced 90 ° apart: excitation winding and control winding. One is the excitation winding Rf,Servo Motor which is always connected to the AC voltage Uf; the other is the control winding L,Servo Motor which is connected to the control signal voltage Uc. Therefore, the AC servo motor is also called two servo motors.
The excitation winding is connected in series with a capacitor C to generate a two-phase rotating magnetic field. Proper selection of the size of the capacitor can make the phase difference of the current flowing into the two windings close to 90 °, Servo Motor thereby generating the required rotating magnetic field.
The excitation winding is fixedly connected to the power supply. When the control voltage is zero, the motor has no starting torque and the rotor does not rotate. If a control voltage is applied to the control winding, and the excitation current. When it is different from the control winding current,Servo Motor a two-phase rotating magnetic field is generated. Under the action of a rotating magnetic field, the rotor turns.