Every stepper motor has a stator and rotor, effectively like any other electric motor. Their unique feature is the segmented nature of the stator, forming what are commonly referred to as ‘teeth’.

Understanding the Structure of Brushless DC Motors ...

These movements employ protein complexes known as the "flagellar motor." This flagellar motor consists of two main components: the rotor and the stators. The rotor is a large rotating structure, ...

Between the two rotors is a fixed flux modulator, a stator with ten ferromagnetic inserts screwed into it. In operation, which the video below demonstrates nicely, the magnetic flux is coupled ...