G 2.5A Portable Generator Repair
wc_tx000207gb.fm 30
5. G 2.5A
5.1 Theory of Operation – Capacitor Generators
See Graphic: wc_gr000933
Basic Generator Theory
Wacker air-cooled generators work on the principle of electromagnetic
induction i.e., the cutting of magnetic lines of force by a coil of wire to
produce an electric voltage in the coil of wire.
The two main components of the generator, the rotor and stator, are
the key. The rotor acts as the magnet and the stator acts as the coil of
wire. As the rotor rotates, its magnetic lines of force are cut by the coils
of wire in the stationary stator. The voltage induced in the windings of
the stator is tapped off and available at the receptacles.
Brushless Generator
This model generator uses a brushless design to generate and
regulate power. It consists of a rotor, stator, diodes, and an auxiliary
winding. The brushless generator also contains a capacitor that is
connected to the auxiliary winding. Its purpose is to regulate the
voltage in the main windings and prevent a voltage drop when a load
is applied.
This generator is designed to operate with single phase loads at or
near a power factor of 1.0. The principle of operation is schematically
represented and a cross-sectional view is shown. The auxiliary
winding (a), in conjunction with the capacitor, provide excitation by
inducing current in the rotor windings (b) which is rectified by the
diodes (c) to produce direct current. The main stator winding (d) is
designed for parallel connection to give a voltage output with no
voltage adjustment possible.
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