automotive starter motor parts

automotive starter motor parts

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• Armature2: It is the rotating part of the motor, consisting of a coil wound around a core. When an electric current passes through it, a magnetic field is generated.


• Field Windings or Permanent Magnets2: Field windings are coils of wire around the armature. When energized, they create a magnetic field that interacts with the armature to produce rotation. Some starter motors use permanent magnets instead, which are more efficient and compact, often found in small - vehicles and motorcycles.


• Commutator2: It is a rotary switch that reverses the direction of current flow through the armature windings, ensuring the armature continues to spin in one direction.


• Brushes2: Made of conductive materials like graphite or carbon, they transfer electrical current to the rotating commutator. They are in contact with the commutator via springs and may wear out over time, requiring regular replacement.


• Solenoid: An electromagnetic switch bolted on top of the motor assembly. It connects and disconnects the battery from the starter motor, and also pushes the pinion gear forward to engage with the engine flywheel.


• Pinion Gear2: A small cylindrical gear that engages with the flywheel of the engine. It transfers the rotary motion of the starter motor to the engine to crank it. Once the engine is running, it disengages to prevent damage.


• Overrunning Clutch: It is installed on the armature shaft together with the pinion gear. When the engine speed increases, the overrunning clutch slips the pinion gear, disengaging it from the flywheel to protect the starter from over - speeding.


• Starter Relay2: It controls the electrical current to the starter motor, acting as a switch that allows the high - current starter motor circuit to be activated by the ignition switch.


• Lever Fork: A mechanical component that converts rotary motion into linear motion. It is used to engage and disengage the starter motor with the engine. When the starter motor rotates, the lever fork moves linearly, pushing or pulling the pinion gear into or out of mesh with the ring gear on the engine.


• Solenoid Plunger: Located at the end of the pull - in coil of the solenoid, it connects the movement of the pull - in coil to the drive lever, serving as a connecting rod.


• Solenoid Cap: It is the cover of the starter solenoid, with three terminals. Terminal 50 is connected to the starter circuit of the ignition key, terminal 30 is directly connected to the battery, and terminal C channels the main current from the solenoid to the starter motor.