Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1917-05-26
SPECIALISTS DESCRIBE ADDITIONAL METHODS OF
Fl ECTRO MAGNETIC REGULATION IN THE MOTOR CAR

siSts OF a resistance whose value Is
controlled by the magnetic action ~
a Solenoid The device, in brief. con
sists OF an arm piN Otcd at one end al !
equipped with a carbon brush on &c
other end. This carbon brush moves
over a number OF metal segmentS ar-
ranged in the form Of an arc OF "ir-
Gle and connected together by small!
coli OF resistance wire The field cir,
cult OF the generator has one tcrmi7-
al connected to the arm and another
connected to one end of the series
OF segments The position OF the car
bon brush on the segmGnts will de
termine The portion OF the total re-
sistance connected in series with the
field winding
For example, when the carbon
brush is on the segment 70 which the
field winding is connected, no part
of the resistance will be in series with
the field. On the other hand, If tie
carbon brush is on the segment fur
thest removed from the one to when
the field winding is connected all the
resistance will be in series with TIE
field winding The normal position
Of the arm corresponds to the one IN
which there is no part Of the resist
ance in series with the field winding.
The position Of the rheOstat arm IS
determined by the combined magnetic
action of the current in the winding
Of the solenoid about the iron core
marked T, Fig. |, and the weight tf
the plunger, r, the core and the plum
ger being attached to the opposite
De ~ W rNS
over a Erooved wheel attached to tie
rheostat arm. The weight Of the p!ur-
ger, r, may be increased by adding
more shot and decreased by removing
some Of the shot. Increasing the
weight Of the plunger, K, will increase
the current required to produce
given movement Of the rheostat arm.
Effect Of Generator Output
The entire output of the generator
passes through the winding of tie
solenoid, and as this current output
tends to exceed the, value for which
the adjustment has been made the
: irpn-core marked T viii be drawn into
the solenoid, causing the carbon brush
on the end of the rheostat arm to
move down over the segments. The
yalue of the resistance in the field
circuit will be increased, causing de-
crease in the value of the field cur
rent, and, hence, a decrease in the
electrical pressure In the armature OF
the generator.
A wiring diagram Of the. Adlake
Newbold combined regulator and cut
out Ia shown in Fig. l. The generator
is OF the shuntwound. type and thu
field circuit may be traced as follows
Starting with the generator terminal
marked I'D, 60 to the corresponding
terminal on the controller marked
I'D, thence to the fuse clip marked
6, thence to the terminal of the Thec-
stat marked 8, thence through the
resistance coils to the carbon brush
on the end Of the rheostat arms thence
20 the screw 10, thence through the
flexible connection to the screw Is,
thence to the fuse clip marked 2,
thence through the fuse to the clip
i. thence to the terminal IF on tae
regulator, thence to the CORES 90hd-
ing terminal on the generator mark,
ed IF, thence through the shunt
, field winding to the terminal OF the
generator, I'D, thence through the
armature winding to the starting
point I'D.
A second circuit exists between the
terminals I'D and ID Of the gener-
ator, even though the contacts of the
cutout be open. 1t may be traced as
follows: Starting with the terminal
I'D, thence to the fuse clip 6, thence
through the fuse 10 to clip Z, thence
through a winding on the solenoid to
the connecting terminal 20, thence to
the point X ON the stationary contact
of the cutout, thence through the wind
ngs of the two upper electro-magnets
In series to the connecting terminal Is
and then to the terminal d on the
generator.
AS the voltage OF the generator
builds up the current in the circuit
. just traced through increases, and
when the magnetic pull produced by
the current in the two upper electro
magnets is sufficient to draw up the
two lower electro-magnets, which are
mounted on the piece Of Iron z, the
cutout contacts at WI and VIZ will be
closed. The closing Of the cutout con.
facts will complete a new circuit,
< WHICH may DC IldCSO DIS I0II0"b'
Starting with the generator terminal
2 I'D, thence through fuse 10, thence
through a winding on the solenoid to
the connecting terminal 90, thence to
the point X and to the upper, or sta.
tionary, cutout contact WI, thence to
the lower cutout contact VIZ, thence
through the windings of the two low
er electromagnetic in series to the con
meeting terminal II, thence to the
controller terminal +B. thence to the
positive terminal of the battery
marked +B, through the battery tc
the terminal thence to the mega
tive terminal Of the generator and
tkence to the terminal I'D, or start
. Ing point.
Effect on Lamps on Output
la tracing this last circuit the
laTups were assumed to be turned off
The cGrrca* il; the Two lower electro
magnets ese!stS in holding the cut
o.. contacts closed as long, as the
battery is charging, but should the
battery start to discharge the mag
nr,ic action will be opposite that pro
Ia by the upper electromagnets