The donut motor is really just a brushless DC motor with a sign-pole stator and a multi-pole rotor. The frame of the motor is built from a styrofoam donut, hence the motor’s name. The rotor is ...

In every brushless DC motor, there are a few common parts: the rotor has a few powerful magnets embedded in it, a stators with coils of wire, and the an enclosure to keep everything together.

The rotor is the rotating element of an electric ... an external motor controller to modulate DC current (brushless DC motors) and ones that use AC current (permanent-magnet synchronous motors).