Stepper motor
Stepping motor structure: composed of rotor (rotor core, permanent magnet, shaft, ball
Bearing), stator (winding, stator core), front and rear end covers, etc.

The following picture shows the actual disassembly of a stepper motor:
stepper motors are electromechanical components that use electromagnetic effects to gradually bring the electronic rotor to rotate by changing the order of the energized coils.