A New or Improved Regulator for Transformed Electric Currents.
Year: 1889

page_text: Date of Application, 9th Mar., 1889
Complete Specification Left, 29th Nov., 1889-Accepted, 4th Jan., 1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by ALFRED MILLS TAYLOR, at present in Baroda, India,
Electrical Engineer.]
A New or Improved Regulator for Transformed Electric Currents.
We, SIEMENS BROS. & Co. Limited of 12 Queen Anne's Gate, Westminster, in the
County of Middlesex, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to regulate the secondary electric current from a
transformer, which is applied to work a number of lamps or for other purposes,
rendering its electromotive force constant or nearly so, notwithstanding considerable
variations in the number of lamps worked by it or in the expenditure of electricity for
other purposes.
The regulator, according to this invention, is constructed as follows:-One of the
leads for the secondary current from the transformer, instead of going directly to the
lamps or other objects, which it works, passes on its way through the coils of
a solenoid, the core of which is one of the limbs of a horse shoe or U shaped piece
of soft iron, preferably made up of wires or laminae.
The other limb is also the core of another solenoid having a greater number of
convolutions than the former. The latter solenoid is in a shunt circuit connecting the
leads for the secondary current at points before and after it passes through the lamps
or other objects worked by the current. The two limbs constituting the cores
above mentioned, and their U connection are suspended by an adjustable spring and
are free to move up or down within the two solenoid coils, presenting their ends
towards a stationary bar of iron. The regulator operates in the following manner.
When the expenditure of electricity is lessened as, for instance by extinguishing a
number of the lamps, more of the secondary current passes through the shunt coil,
exciting its core magnetically so that the cores are attracted towards the stationary
iron bar, and move towards it in opposition to the spring. This approach of the other
core induces in its coil, which is in the main secondary circuit a back electromotive
force reducing that of the current proceeding to the lamps which would otherwise be
too great.
Conversely, when the number of lamps in use is increased, the reverse action takes
place, the shunt coil having less current excites its core less powerfully, the cores are
drawn by the spring away from the iron bar, and the back electromotive force in the
main circuit coil is lessened.
1
1000
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
A New or Improved Regulator for Transformed Electric Currents.
We, SIEMENS BROS. & Co. Limited of 12 Queen Anne's Gate, Westminster, in the
County of Middlesex, 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 :-
The object of this invention is to regulate the secondary electric current from a
transformer, which is applied to work a number of lamps or for other purposes,
rendering its electro-motive force constant or nearly so notwithstanding considerable
variations in the number of lamps worked by it or in the expenditure of electricity
for other purposes.

page_text: The regulator according to this invention is constructed and arranged as we shall
describe referring to the accompanying diagram in which P represents the primary
and S the secondary coil of a transformer supplying electricity to a number of lamps L.
One of the leads a for the secondary current from the transformer P'S. instead of
going directly to the lamps L or other objects which it works, passes on its way
through the coils of a solenoid C the core of which is one of the limbs of a horse shoe
or Ushaped piece K of soft iron, preferably made up of wires or laminae.
The other limb is also the core of another solenoid E having
a greater number of
convolutions than C. The latter solenoid E is in a shunt circuit connecting the
leads a and c for the secondary current at points before and after it passes through the
lamps L or other objects worked by the current. The two limbs constituting the
cores above mentioned, and their U connection K are suspended by an adjustable
spring F and are free to move up or down within the two solenoid coils C and E
presenting their ends towards a stationary bar of iron or armature A.
The regulator
operates in the following manner. When the expenditure of electricity is lessened as,
for instance by extinguishing a number of the lamps L, more of the secondary current
passes through the shunt coil E exciting its core magnetically so that the cores are
attracted towards the stationary iron bar A and move towards it in opposition to the
spring F. This approach of the other core induces in its coil C which is in the main
secondary circuit a back electro-motive force reducing that of the current proceeding
by a a to the lamps, which would otherwise be too great.
Conversely, when the number of lamps in use is increased, the reverse action takes
place, the shuni coil E having less current excites its core less powerfully, the cores
are drawn by the spring F away from the iron bar A, and the back electro motive
force in the main circuit coil is lessened, leaving the direct electro-motive force for
the lamps greater.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
A regulator for transformed electric currents consisting of a two limbed solenoid
made in horseshoe form and suspended by an adjustable spring with the ends of its
cores presented towards a stationary armature, the one core having its coil in the
main secondary circuit and the other core having its coil of a greater number of
convolutions in a long shunt from the secondary circuit, substantially as described.
Dated this 29th day of November 1889.
ABEL & IMRAY,
Agents for the Applicants.