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)
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Casing
Drive housing
End cap
Armature
Brushes
Drive
Bushings
Solenoid
Drive fork
Return spring
Construction Video
Parts Pole shoe type
• Four pole shoes
• Four field windings
• Fords movable pole shoe
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One pole shoe is moveable
Contact disc
Return spring
Plunger
Pole shoe Video
SOLENOIDS
• Types:
– Positive engagement
– Solenoid Actuated
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Function:
Engage starter drive*
Supply current to starter
Disengage the current and drive
*not on moveable pole shoe type
Construction
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Pull in windings(large)
Hold in windings
Plunger
Return spring
Contact disc
Solenoid Video
Wind types
• Series
• Shunt (parallel)
• Compound (series/parallel)
Starter drives
• 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
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