Alternator Function; Brushless Excited Field Coil Type; Excited Field Coil Type With Brushes; Single Phase Output Type - Honda Motorcycle Service Manual

BATTERlESlCHARGlNGlLlGHTlNG SYSTEM
Brushless Excited Field Coil Type
I I
The other alternators described here are located within the
engine. This alternator is exposed outside the engine because
it is air cooled. In general, the rotor speed is multiplied by gears
or chains connected to the crankshaft. This type is the most
powerful amoung the triple phase alternators and is primarily
used for power on large displacement motorcycles.
Excited field coil-type alternators do not utilize a permanent
magnet. Instead, the field coil magnetizes the rotor and
generates power as the rotor passes the coil
Excited Field Coil Type With Brushes
I
This type has a field coil placed inside the rotor. Current flows
through the brushes to the field coil and electromagnetically
induces the rotor. This generator has a strong magnetic force,
large output, and is small and lightweight.
ROTOR
/
STATOR
ALTERNATOR FUNCTION
Single Phase Output Type
Since this type uses only one charging coil, the output voltage
is a single-phase AC wave. The output frequency varies
depending on the number of magnets on the rotor, and the
speed of the rotor.
The generator in the diagram on the right has t w o pairs of
magnets, and its output has t w o cycles for every rotation of
the rotor.
ONE ROTATION OF ROTOR
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The single phase output type has a low output, and its small
ALTERNATOR SYMBOL
size is best suited for engines of small displacement and a
small electrical load.
Date of Issue: March,
1995
o
HONDA MOTOR CO.,LTD.
22-15