stator
The stator generates a fixed magnetic field around the rotor. This magnetic field can be generated by permanent magnets or electromagnetic windings. The type of BDC motor is divided by the structure of the stator or the way the electromagnetic winding is connected to the power supply (for different types of BDC motors, please refer to the types of stepper motors).
Rotor
The rotor (also called the armature) consists of one or more windings. When these windings are excited, a magnetic field is generated. The magnetic poles of the rotor magnetic field will attract the opposite magnetic poles of the stator magnetic field, thereby causing the stator to rotate. During the rotation of the motor, the windings are continuously excited in a different sequence, so the magnetic poles produced by the rotor will never overlap with the magnetic poles produced by the stator. This conversion of the magnetic field in the rotor winding is called commutation.