Servo motor, motor AC servo motor structure can be divided into two parts, namely the stator part and the rotor part. The structure of the stator is basically the same as that of the rotary transformer, and the two-phase windings with 90-degree electric angle are arranged in the stator core. AC servo motor is a kind of two-phase AC motor. When AC servo motor is used, UF is applied at both ends of excitation winding, and UK is applied at both ends of control winding. When a voltage is applied to the stator winding, the servo motor will soon start to turn. The current flowing into the excitation winding and the control winding creates a rotating magnetic field in the motor, and the rotation of the rotating magnetic field determines the rotation of the motor, the direction of the rotating magnetic field changes, and so does the direction of the motor. In order to form a circular rotating magnetic field in the motor, a 90 degree phase difference between the excitation voltage UF and the control voltage UK is required
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