In this video clip the narrator mentions that a BLDC motor controller converts DC power to ______?

In this context, a BLDC (Brushless DC) motor controller converts DC power to AC power. This is achieved through the use of electronic commutation instead of traditional mechanical brushes, which allows for the control of the motor's speed and direction. The controller modulates the power provided to the motor windings in a way that creates rotating magnetic fields, effectively converting the supplied DC voltage into AC waveforms that can drive the motor. This conversion is essential for the operation of BLDC motors because they require specific phase sequences and timing to function correctly, ensuring efficient performance and extended lifespan without the wear and tear associated with brush mechanisms.