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centre
distance
of the drive gearing),
an
d
a
flange for
securing the
gene ra
tor
on the
mCPtoncyde
eng
ine
cr.ankcase.
The generator is
provided a
t
the drive end with rubber
gland
2
to
isolat-e
the
inner space
of
1Jhe generator
from
t he
aggressive
m
e-
dium
of the
' C
rankcase.
Rotating
in
sealed-fo
r-life bearings 11
, pa
-
cked on
both
s ides,
is
rotor 3
with
a field winding and slip rings.
Three-phatse w
inding
4
of the stator is
star~connected
with
a
n
insulated n eutral wire. The
phase
leads are
soldered to
the heads
of
bolts
securing rectifier
unit
8.
Two covers,
1
and 6,
as
well
as stator
ane f·itted together by
mea
ns •of three ·screws M6.
The
brushes
with
current-carrying
plates are
secured
t-o
brush
hold
er
7
and
cover
6
wit
h
the help of screws
which
are !prevented
from
falli
ng-out.
The generator
incorporates semiconductor
rectifier
unit
8 type
B5f-·
2 A
w
hi
ch
permi
ts a
di
rect
current to
be obtained fro
m the
ge-
nerator
terminals.
The
recti·fier unit
consists of three
monoblocks which are
cast
from aluminium
al
loy
and
provided with fins
,
f or
heat
dissi·
p
ation.
Each
of
the
monoblocks
is
fitted
with
two
semiconductor
elemenfs
of opposite ,polarity, the
electrical
connection
between them is
ensu-
red by two
tbusbars
(one of
which is
insulated
and
the
other
con-
nected
to
"earth").
The insula1ted
busbar
is provided
with
a -clam-
p
ing s
crew.
The
rectifier unit
mu
st
never
be
disassembled
.
Moun
ted on the
extension
of rotor
3
shaft,
under
protective
ca-
sing
10,
is axia
l
fa
n
9,
w
hich
is intended to coo
l
the
rectifier unit.
The terminals
for
connection
of
the generator to
the electric
circuit
of the
motorcycle
are avai!table on common
termin
a
l
block 5
and are
fitted with
limiotin
g
was
her
s
to avoid the possibility of ·confusing the
conduct
ors
during
wiring and
to
·
p revent
occasiona
l
disconnection
of
the
conductors
in operation
.
0
perating Principle
The
operating principle of the
f424
generator
is
similar
to that
of
a ny
other three-phase
synchronous m
achi
ne wi·th
el"ectromagnetic
excitation, but this generator
h
as
the
fo llowi
n
g distinguishing
fea-
tu res:
when
startint
g from
res
t
an
d during
speeding-up, flhe
field
win-
ding
of the generator must
t
b e
ener.gized fr
om an
extern
a
1
d.
c. so-
<J rce
(a
storage battery), and the
genenator
starts to operate as the
res
ult
of self-excitation only a fter being
exdted
f·r
om the storage bat-
tery
at
i.he
rotor speed exceeding
2400
r.
p.
m
.
Operating
the
generator
with the
storage battery
completely dis-
charged
is
impossible
sin
ce
the
g
enera tor fails
to be
excited.
I
n
case
the
genera'tor
i•
s
01perated without load
(the wires
lead
-
ing to the
consllil11ers bei ng
rup
tured or
disconnected)
at a
high
speed,
the
a. c.
voltage
between
the phases reaches a v alue that may
cause
th
e
semiconductor
elements of the
unit
to
be
punctured and
t
he
generator to be
damaged.
6()
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