Wiring Diagram; Output Power (Ac); Output Power (Dc) - Briggs & Stratton CE8070 Troubleshooting Manual

Hand-Held Series Generators • Familiarization & Troubleshooting Guide
Section 1 • Introduction
Figure 5 — Generator Wiring Diagram

Output Power (AC)

The residual magnetism of the rotor induces an (AC)
voltage in the power and excitation windings when the rotor
is turned by hand (when recoil starter is pulled). The (AC)
voltage of the excitation winding builds in the condenser
until it discharges. This "capacitive discharge" then
strengthens the magnetic field in the excitation winding. As
the rotor windings "cut" this strengthened magnetic field, a
higher (AC) voltage is induced in the rotor winding. The
diode in the rotor rectifies the induced rotor (AC) to (DC).
The intensified magnetic field of the rotor "cuts" across both
the power and excitation windings. When the engine starts
and spins the rotor, residual magnetism is overcome and this
cycle continues to increase the (AC) output voltage of the
GENERATOR SYSTEMS
power and excitation windings until magnetic saturation and
condenser capacity is balanced. This is the calculated "Rated
Output" of the generator.
When an external load is plugged into an output receptacle,
the increased current flow intensifies the magnetic field of
the power winding. As the magnetic field of the rotor "cuts"
across the intensified field of the power winding, an
additional voltage is induced into the rotor field winding.
This increases the output of the power winding to
compensate for the voltage drop of the load.

Output Power (DC)

(AC) voltages that are induced into the 12VAC winding are
rectified to (DC) by a "full-wave" bridge rectifier.
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