Motorcycles Without Batteries; Voltage Regulator; Dc Voltage Unit - Honda Motorcycle Service Manual

BATTERIES/CHARGING/LlGHTlNG SYSTEM
MOTORCYCLES WITHOUT BATTERIES
Some motorcycles do not have batteries in their electrical
systems. These models power electrical components with the
electricity generated by the alternator, which is regulated by
an AC regulator. For components using transistors which re-
quire DC current, a small rectifier (DC power unit) is used to
rectify alternator signals to DC and feed DC current to these
components.
Voltage regulator
To provide a stable current without using a battery, a high
power output alternator that feeds sufficient current at low
engine rpm is utilized. If the alternator continues supplying cur-
rent as the engine rpm increases, the excessive current may
burn out light bulbs.
To prevent this, the AC regulator maintains the output voltage
of the alternator in the specified range. Some AC regulators
have a protection circuit built into the alternator regulator
circuit to prevent abrupt voltage increases on cold engine
/
AC REGULATOR
1
WITH PROTECTION CIRCUIT
1
; "
&-UNREGULATED VOLTAGE
w
REGULATED VOLTAGE
6
"
loads at voltage levels lower than the regulated voltage value.
AS the engine rpm increases, the regulator detects the rise and
directs current to thyristor, shorting the alternator output to
ground. When the alternator voltage goes over the specified
voltage, the regulator cuts off the excess voltage, maintaining
a constant voltage output.
starts.
DC voltage unit
Although most electrical components use AC current, there
are systems such as the engine oil warning system which
require DC current to operate their transistors and LEDs.
Therefore, a compact and light weight DC voltage unit
rectifies the AC current to DC current for these systems.
These are systems and components used specifically for AC:
alternating flash turn signals, whose front and rear signals
flash alternately, and the AC horn which use electrical circuits
and components designed for models without batteries.
-
ENGINE RPM b
AC REGULATOR DC VOLTAGE UNIT
I l - l
The current aenerated from the alternator flows directlv to the
LED LIGHTING CIRCUIT
JIL WARNING
s P p u LIGHT (LED)
OIL LEVEL SWITCH
ALTERNATOR
Date of Issue: March, 1995
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HONDA MOTOR CO.,LTD