Honda E1500 Shop Manual page 19

t7
2.
A-C Output Circuit and
AVR (Automatic
Voltage Regulator)
As current flows tfuough the rotor field
winding
(FC), voltage is
induced
in
the stator A'C output
winding-
(MC)
bV
the
magnetic
field
produced around
the.two poles
of
the rotor magnet. The
fastlr_the
1o!9r
tgry-s,
the greater_the voltage
will
be.-
The
voltage
will
also increase as
the
turrent flowing through the
rotor field
winding
(FC)
increases.
The output
voltage
is
then
available
at the output
regeptacle
on the control panel.
On E1500
the output
reaches the
_p^redetermined
maxitum at
2,000
-
2,500
rpm.
Therefore,
in
order
to
keep
it
from
increasing
beyond
the
safe
limit
at
3,000 rpm (50H2)
or
3,600
rpm (60H2),-an automatic voltage regulator
(AVR) is
provided.
The
AVR
reduces
current flowing
through
the iotor
tietO winOing
(FC), so that
damaging
high-voltage and high-current
output
in
the
A'C output winding (MC)
is
prevented.
If
the output voliage falls below the
rated value, the
unit
increases
current flowing
in
the rotor field
winding
(nC1.
fne
sam" s"quince
of
events takes
place
to
maintain
a constant voltage
at all times. Fine
adjustment
of
output
voltage can
be
made
by
turning
the control knob
(VR)
either
right or
left
as necessary.
I\4C
EC
i; il
SJHt-ffttrtr...,
is wound around the stator poles independentty
of
the
A-c output winding (MC). rhe
voltage induced
in
the winding
is rectified
by
a diode
rectifier
(Dl)
and is sent
to
the D-C output terminals
on
the
control
panel-.
Although
the circuit is
not
affected
by the AVR, the output
adjustment
is
also possible
by
turning
tlp
control
knob eitlrer right
or left
as
necessary.
O
C
C
Dl-2
DC.C
Dl-
|
(D
o
Date
of
lssue: Dec.,
1977
O HONDA MOTOR CO.,
LTD"
L
p
-T
FC
a--
VR
AVR
.4