Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1917-09-08
go Attest NEWS OF the i MQI{02MXOblLf TRApEaz
(By Special Permission from Motor
Age.)

ed on the motor car, thus keeping
the battery practically completely
charged at all times so that an ample
supply of energy is always available
for operating the starting motor.
lamps, horn and other electrical de-
vices which may be installed original
ly on the car. In no case should adj
ditional electrical equipment be in
stalled upon any car unless you are
reasonably sure the capacity Of the
storage battery is ample to take care
of the additional load and at the
same time the capacity of the genera.
tor is sufficient to keep the battery
charged under normal operating con-
ditions.
The generator will not start to
charge the storage battery until the
electrical pressure generated in its
armature is greater in value than the
electrical pressure of the battery. The
electrical pressure generated in the
armature winding of the generator de-
ponds on the speed at which the gen.
orator is driven, and IL will vary di.
rectly as the speed at which the arma-
ture is revolved If all the other guam
titles on which the pressure depends,
such as the strength Of the magnetic
field Of the machine, ETC., remain con-
slant in value. Il is obvious, since
the electrical pressure in the arma.
ture Of the generator depends on the
speed, that the battery would dis
charge back through the generator, il
they were permanently connected to-
gether, when the speed Of the genera
tor happened to be of such a value
that the electrical pressure of the gen.
orator was less than the pressure of
the battery. The function of the cut
out Is to provide means of discon-
meeting the battery from the generator
when the battery starts to discharge
back through the generator. AS ex.
planned In one Of the previous chap
tiers, these cutouts assume several diff
ferent forms, some being operated
electrically and some by hand.
Speed Ratio Changes - ~ 49,.
In order that the electrical pres.
sure in the armature winding of the
generator may increase in value as
the engine speeds up and the genera
tor starts charging the battery, it is
necessary that some mechanical con- |
nection be established between the
crankshaft Of the engine and the
armature shaft Of the generator. The |
requirements OF this connection are |
quite different from those imposed on
the mechanical connection between |
the starting motor and the crankshaft |
Of the engine. First of all, the toruue
required to drive the generator when
II is delivering its rated or normal
full load will be nothing like. as great i
as the torque the starting motor must
develop when II Is turning the engine
over in starting; hence, the mechani.
cal strains to which the generator
connections are subjected will as al
rule be less than those imposed on
the motor connections. Second, the
design and operation of the motor con-
nection in the majority OF cases must I
be such, that the motor will be dis.
connected from the engine craakshaft I
when the engine starts to fire either
automatically or by some. manualt
means.
No such requirements need be met
in the case of the generator connec-
ton, and they are connected in almost |
every case permanently to the crank. I
shaft Of the engine. In some cases,
such as in the installation of the Del
co dynamotor, asdouble mechanical
connection is provided, but their con-
struction is such that only one of them
is operative at any one time, as will
be explained later. Third, the ratio be-
tween the speed OF the generator shaft
and the crankshaft of the engine, ex
cept in the case Of dynamotors with
single drive, is quite different from
the ratio between the speed of the
motor shaft and the crankshaft of the
engine. This difference is due chiefly
to the fact that the generator viii be
connected to the engine all the time
and, Of course, will have 10 operate
under a wider total variation in en-
CINE speed than the starting motor.
Divisions Of Connections
II the same relation between engine
and generator speed were provided as
In the case of the motor, tie speed OF
the generator would exceed the allow
able limit, and it would be almost i'm
possible to contruct at armature and
that would withstand con.
tinuously the enormous centrifugal
forces that would exist at these very
high speeds. In the connection Of a
dynamotor to the engine by single
drive the gear ratio will have to be
lower than the maximum ratio with a
double drive to keep the maximum
speed down. .....
Fourth, in some cases the ignition
distributor is combined with the gen.
orator and driven through gear con-
nection from the generator shaft. In
such cases it is absolutely imperative
that the position of the distributor
arm in relation to the proper firing
order of the various cylinders remain
fixed at all times, anu in such cases y
Il is obvious that the connection be-
tween the generator and the engine
must be very definite <.a
Generator connections may be d.
vided into the following main groups
and brief description of one or more Il
typical examples of each kind will be
given: liz
Friction drive. Ii
Pa1fs drive r.. -, 4