Theory of operation – Lincoln Electric EAGLE SVM192-A User Manual

Page 34

THEORY OF OPERATION

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

REACTOR

RANGE

SWITCH

OUTPUT

BRIDGE

CHOKE

TERMINAL

FLYWHEEL
ALTERNATOR

PRINTED CIRCUIT

BOARD

TOROID

POSITIVE

NEGATIVE

FIGURE E.2 – BATTERY, STARTER, ENGINE, ROTOR, STATOR AND IDLER SOLENOID