The drive to the servo motor is not DC, nor the traditional sense of AC, but according to the motor rotor position in the sequence of power, servo motor must have encoder feedback rotor position.
The specific waveform can consult the relevant information of synchronous motor and AC servo motor (the two are two naming methods of a class of motors). The power output of AC servo driver is, of course, AC.
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And when the input terminal is connected to three-phase 380VAC, the output voltage is generally adjustable in three-phase 0~380VAC.
The power to the servo motor is usually alternating current, because the servo motor needs to constantly change its speed and steering, and the frequency of alternating current can be adjusted by the frequency converter, thus controlling the speed and steering of the motor.
In addition, the alternating current can also be raised and lowered through the transformer, so that the motor can adapt to different working environments. Direct current is not easy to adjust the frequency and voltage, so it is not suitable for use in servo systems.