THEORY OF OPERATION | ||
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FIGURE E.2 - ENGINE, EXCITATION, ROTOR AND STATOR
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ENGINE
MAGNETO
MECHANICAL ROTATION
ROTOR
SLIP
RINGS
CAPACITOR
REACTOR
OUTPUT
TERMINALS
STATOR
ROTOR
STATOR
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115 AND 230VAC
RECEPTACLES
RHEOSTATBRIDGE
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ENGINE, EXCITATION, ROTOR
AND STATOR
A small voltage developed by the engine magneto is fed through a diode to the rotating field coil in the rotor via a brush and slip ring configuration. This excitation (“flashing”) voltage magnetizes the rotor lamination. The rotor is mechanically coupled to the engine. The rotating magnet induces a voltage in the stationary windings of the main alternator (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 feedback winding provides rotor current during machine operation. The output of the BULLDOG 140 is dependent on two cri- teria: the engine RPM and the amount of current in the rotor winding.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion
