Theory of operation – Lincoln Electric EAGLE SVM192-A User Manual
Page 34
THEORY OF OPERATION
E-2
E-2
EAGLE™ 10,000
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
BATTERY, STARTER, ENGINE,
ROTOR, STATOR, AND IDLER
SOLENOID
The 12VDC battery powers the starter motor.
When
the engine is started and running, the battery circuit
voltage is fed, through the printed circuit board, to the
rotating field coil in the rotor via a brush and slip ring
configuration. This excitation (“flashing”) voltage mag-
netizes the rotor lamination. The rotor is mechanically
coupled to the engine. This rotating magnet induces a
voltage in the stationary windings of the main alterna-
tor (stator). Three separate and isolated windings are
incorporated in the stator lamination assembly.
Each
winding set has a different number of turns producing
different magnitudes of AC output voltages. The three
windings are the weld winding, the auxiliary power
winding and the field feedback winding. The field feed-
back winding provides rotor current during machine
operation. The output of the EAGLE 10,000 is depen-
dent on two criteria: the engine RPM and the amount of
current in the rotor winding.
The flywheel alternator, located on the engine, supplies
“charging” current for the battery circuit.
The battery
circuit provides power for the printed circuit board and
also for the idler solenoid.
The idler solenoid is
mechanically connected to the engine throttle linkage.
If no current is drawn from the EAGLE 10,000, the
printed circuit board activates the idler solenoid, which
then brings the engine to a low idle state. When either
weld or auxiliary output current is sensed by the toroid
the printed circuit board deactivates the idler solenoid,
and the engine goes to high RPM. After 12 to 15 sec-
onds of no load, the solenoid is reactivated to reduce
the speed.
STARTER
ENGINE
BATTERY
IDLER
SOLENOID
OUTPUT
CONTROL
MECHANICAL
ROTAT ION
FIELD
CAPACITOR
ROTOR
SLIP
RINGS
115 & 230VAC
RECEPTACLES
ROTOR
STAT OR
STAT OR
REACTOR
RANGE
SWITCH
OUTPUT
BRIDGE
CHOKE
AC
AC
TERMINAL
TERMINAL
FLYWHEEL
ALTERNATOR
PRINTED CIRCUIT
BOARD
TOROID
TOROID
POSITIVE
POSITIVE
NEGATIVE
FIGURE E.2 – BATTERY, STARTER, ENGINE, ROTOR, STATOR AND IDLER SOLENOID