STARTING SYSTEM Function: Bring the engine to cranking r.p.m. (200rpm) so the engine can draw fuel and air and ignite that fuel and air.

Starter Principles Video

Construction (PARTS) CasingCasing Drive housingDrive housing End capEnd cap ArmatureArmature BrushesBrushes DriveDrive BushingsBushings SolenoidSolenoid Drive forkDrive fork Return springReturn spring

Construction Video

Parts Pole shoe type Four pole shoesFour pole shoes Four field windingsFour field windings Fords movable pole shoeFords movable pole shoe –One pole shoe is moveable –Contact disc –Return spring –Plunger

Pole shoe Video

SOLENOIDS Types:Types: –Positive engagement –Solenoid Actuated

Function:Function: Engage starter drive*Engage starter drive* Supply current to starterSupply current to starter Disengage the current and driveDisengage the current and drive * not on moveable pole shoe type

Construction Pull in windings(large)Pull in windings(large) Hold in windingsHold in windings PlungerPlunger Return springReturn spring Contact discContact disc

Solenoid Video

Wind types SeriesSeries Shunt (parallel)Shunt (parallel) Compound (series/parallel)Compound (series/parallel)

Starter drives Function:Function: –Provide for a positive engagement with the ring gear. –Protect the armature from prolonged engagement.

Starter Drive Video

Starter Armature Function: Is the moving part of a starter motor. The armature uses an EMF to push and pull itselfFunction: Is the moving part of a starter motor. The armature uses an EMF to push and pull itself

Commutator Purpose: The commutator is on the armature, it is used to switch the current paths though the armature windings so that the armature always bends the “Lines of Flux” (carrot in front of the donkey)

Commutation