Stihl 009 User Manual

STIHL 009, 010, 011 21
4. IGNITION SYSTEM 4.2 Description of Operation
4.1 Construction
The 010 is equipped with a breaker- Every magneto ignition system ope- voltage is principally depended on the
controlled magneto ignition system rates on the principle of magnetic strength of the primary current which
which requires neither a battery nor induction. On the breaker-controlled generates the magnetic field and the
a generator. ignition system (and transistorized ratio of turns between the primary and
ignitions) this involves only "dynamic secondary coils (transformation ratio).
induction".
The Phelon ignition system is of com-
ponent-type construction (ignition ar- In dynamic induction the electric
mature and control unit are arranged current is generated in a conductor
separately) and consists of three main by moving the conductor through the
parts - the flywheel (magnet wheel), flux lines of a magnetic field. The
ignition armature and the control unit. magnitude of the induced voltage is
basically dependent on the strength
The flywheel carries the permanent of the magnetic field and the speed of
magnet with a north and south pole the flux change. This in turn is in-
and is located on the crankshaft stub. fluenced mainly by the intensity of the
The ignition armature is mounted in movement.
the crankcase on the periphery of the
flywheel and can be adjusted within In terms of the magneto ignition
certain close limits by means of slots system this means: As the flywheel
in the iron core. rotates the flux lines flowing between
the poles of the permanent magnet,
The ignition's control unit, i. e. the con- from north pole to south pole, create
tact set with condenser, is screwed to a magnetic flux in the iron core of the
the crankcase behind the flywheel. coils. The flux lines of this magnetic
field cut through the wire windings of
the respective coil and induce a low
tension current. The magnitude of the
voltage is, therefore, basically depen
dent on the rotational speed of the
flywheel.
In the case of static induction on the
other hand, the voltage is created in a
conductor by a magnetic field chang
ing its strength or flow direction, the
conductor being situated in the mag
netic field which is produced by an
electric current (transformer prin
ciple). The magnitude of the induced

Stihl 009 Specifications

General

Brand	Stihl
Model	009
Category	Chainsaw
Language	English