The motor is NOT AC. The terminology 3 phase DC means that it is a brushless DC motor where the windings are excited by a switching DC power supply which turns the power on & off to the correct winding at a very fast pace such that the fixed magnet in the motor tries to "keep up" with it, hence the rotation:
Check this out, especially page 8:
https://www.monolithicpower.com/pub/media/document/Brushless_DC_Motor_Fundamentals.pdf
These motors last a long time coz there is no grinding brush to wear off but the driving electronics has to be spot on and are very complicated.
Check this out, especially page 8:
https://www.monolithicpower.com/pub/media/document/Brushless_DC_Motor_Fundamentals.pdf
These motors last a long time coz there is no grinding brush to wear off but the driving electronics has to be spot on and are very complicated.