I assume you are referring to the current feedback for the controller's semiconductor overcurrent protection circuit? in-pulse current limitng? That will not be truly AC or DC; it will be pulsed, a DC value whlie the semiconductor switch is ON and 0 when it is off, 20,000 times per second.
If you're referring to motor current, I believe that is going to be a trapezoidal waveform above 0V. If you wanted some display of motor current for user reference, you could probably average this and display as a DC value.