The structure of the stator of the AC servo motor is basically similar to that of the capacitive split-phase single-phase asynchronous motor, and the stator is equipped with two windings with a position difference of 90 degree , one is the excitation winding Rf, which is always connected to the AC voltage Uf, and the other is the control winding L, which is connected to the control signal voltage Uc. So AC servo motors are also called two servo motors.
Rotorius iš the AC servo motor is paprastai pagamintas į a voverę narvelį tipą, but in order to make the servo motor have a wide range of speed regulation, linear mechanical characteristics, no "rotation" phenomenon and fast response performance, it should have the characteristics of large rotor resistance and small moment of inertia compared with ordinary motors. Yra yra dvi formos of rotoriaus struktūra kad is plačiai naudojama: one is the voverė narvas rotorius pagamintas iš aukštas varža laidus medžiaga pagamintas iš didelis varža kreiptuvas bar, in orderis to redukcija the moment of the rotor, the rotor is made slender; the other is the coreless cup rotor made of aluminum alloy, the cup wall is very thin, only 0.{{1% 7d}.3mm, in order to reduce the magnetic resistance of the magnetic circuit, a fixed inner stator should be placed in the coreless cup rotor.
Kai the AC servo motor has no control voltage, there is only a pulsuojantys magnetinis laukas generuotas by the excitation winding in the stator, and the rotor is stacionarus. Kai yra a kontrolė įtampa, a besisukantis magnetinis laukas is generuotas in the statorius, the rotor rotatorius sukasi in the direction of the rotating magnetic field, in the case of constant load, the speed of the motor changes with the size of the control voltage, when the phase of the control voltage is opposite, the servo motor will be reversed.