Armature:
An armature is an electromagnet component that is mounted on the driveshaft or bearings for a guide. It is made of a laminated soft iron
core which is wrapped with numerous conductor loops or windings.

Commutator:
A commutator is a section of the shaft at the rear of the housing on which brushes run to conduct electricity. It is made of two plates mounted to the axle of the armature, the plates provide connections for the coil of the electromagnet.

Brushes:
Brushes are parts that run on a section of the commutator at the rear of the housing. it rubs the commutator and conducts electricity.

Solenoid:
The solenoid features two coils of wire that are wrapped around the core. This solenoid serves as a switch that connects and close the electrical connection between the starter motor and the vehicle’s battery.

Plunger:
The function of a plunger in a starter motor is to push forward so the pinion can be engaged.

Lever Fork:
The lever fork is connected to the plunger which makes them push forward together to engage the pinion.

Pinion:
A pinion is a small mechanism containing gear and springs. It engages immediately the engine started, by extending the gear to the flywheel teeth. The flywheel is the source of engine rotation.

Field Coils:
The field coils are held in housing with screws as it consists of two or more coils connected in series. These coils receive power from the battery that converts them into an electromagnet that turns the armature. This creates a magnetic field around the armature.