Year: 1888

page_text: Date of Application, 17th Feb., 1888
Complete Specification. Left, 19th Nov., 1888
Complete Specification Accepted, 12th Feb., 1889
We, WILLIAM HARDING SCOTT, and EDWARD ALEXANDER PARIS, both of Gothic
Works, King Street, City of Norwich, in the County of Norfolk, Electrical Engineers,
do hereby declare the nature of this invention to be as follows:-
Our invention relates to an improved method and apparatus for effecting the regu-
lation of electrical currents, whereby a constant potential with a varying current may
be obtained from a constant current with a varying potential.
To effect this purpose, we combine two dynamo electric machines, coupling the
armatures together, one of the machines being arranged to act as a generator, and the
other as a regulating motor.
The armature and the field magnets of the motor dynamo are placed in series in the
main current from the generator, only a few turns of wire being applied to the motor
field magnets, just sufficient to start the armatures and to keep them running at a
certain speed when there is no current in the outside circuit of the generator.
The generator is either shunt or compound wound, and the motor magnets are wound
with thick wire. The operation of our apparatus is as follows
The main current passing through the field magnets of the motor increases the
number of lines of force through the motor armature in proportion to the increase of
this current, and consequently the potential at the terminals of the motor increase
proportionately with the increase of the current from the generator which passes
through the motor magnets.
By winding the generator so that its speed has to increase somewhat to maintain a
constant electro motive force, the potential at the terminals of the motor may he made
to increase in a greater proportion than the current from the generator, and thus make
up for losses in the conversion.
FELL & WILDING,
1, Queen Victoria Street, London, E.C.,
Agents for the Applicants.

page_text: of Electrical Currents.
We WILLIAM HARDING SCOTT and EDWARD ALEXANDER PARIS both of Gothic
Works King Street, City of Norwich in the County of Norfolk Electrical Engineers
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:-
Our Invention relates to an improved method of and apparatus for effecting the
regulation of electrical currents whereby a constant potential with a varying current
may be obtained from a constant current with a varying potential.
To effect this purpose we combine two dynamo electric machines coupling the
armatures together one of the machines being arranged to act as a generator and the
other as a regulating motor.
The armature of the motor dynamo is placed in series in the main circuit from
the generator at the main source of supply or central station and there may also be a
few turns of the wire of the said main circuit applied to the motor field magnets just
sufficient to start the armatures and to keep them running when there is no current
in the circuit of the generator driven by the aforesaid motor armature.
The said generator is either shunt or compound wound and the field magnets of the
motor are wound in series with the circuit of utilization of the said generator.
The accompanying diagram illustrates the plan which we consider the best means
of carrying our Invention into effect. The constant primary current is passed through
the coils of an armature A which acts as a motor armature and it may be through a
few turns of conductor on its field magnets just enough to produce a magnetic field
strong enough to keep the aforesaid motor armature and the generator armature driven
by it revolving when there is no current in the circuit of utilization. Driven by;
and preferably on the same shaft as, the motor armature is the generator armature B
the field magnets CC belonging to which are shunt or compound wound as aforesaid
and the current from this generator armature which goes to the circuit of utilization
is sent round the motor field magnets D D so that as this current increases so does the
number of lines of force through the motor armature A and consequently the electro
motive force at its terminals increases and as long as the motor.magnetic circuit is not
saturated the difference of potential at the motor terminals will increase in the same
proportion as the exciting current round its field magnets and consequently in the
circuit of utilization. The current in the motor armature is constant and as (for the
moment neglecting losses in the conversion) the Watts in the primary or between
the motor terminals must equal the Watts in the secondary or between generator
terminals then as long as the difference of potential in the primary varies in the same
proportion as the current in the secondary the electro motive force of the secondary
must be constant.

page_text: By winding the generator field magnets C so that its armature B has to increase its
speed somewhat to maintain a constant electro-motive-force the loss in conversion
and to some extent the drop in the electro motive force caused by the partial satura-
tion of the motor magnetic circuit may be made to be taken up by the primary circuit
for as the speed of the motor armature increases in consequence of the work done.
by the generator armature not being quite equal to the work done in the motor
armature so will the difference of potential at its terminals increase at a slightly
greater rate than the current in the working circuit which passes round its magnets.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that what
we claim is:-
1. The combination of a motor and a generator in the manner described the field
magnets of the motor being excited by the current of utilization from the generator.
2. For regulating electric currents the combination of motor and generator dynamo
electric machines with their respective armatures on the same shaft and respectively
in circuit with a constant primary current and with the circuit of utilization the field
magnets of the motor being in series with the circuit of utilization substantially as
herein before described and illustrated.
3. For regulating electric currents obtained by secondary generators means sub-
stantially as hereinbefore described whereby the potential in the supply main or primary
circuit is caused to vary in proportion to the variation of the current in the circuit of
utilization.