A Method of Regulating the Electro-motive-force of Dynamo- electric Machines.
Year: 1887

page_text: Date of Application, 25th May, 1887
Complete Left, 25th Feb... 1888
Complete Accepted, 20th Apr., 1888
PROVISIONAL SPECIFICATION.
A Method of Regulating the Electro-motive-force of Dynamo-
electric Machines.
I FREDERICK GEORGE of Uley Dursley Gloucestershire Doctor of Medicine do
hereby declare the nature of this invention to be as follows:-
An arrangement for maintaining an approximately uniform electro-motive force
notwithstanding variations in the speed of the Dynamo or other cause and I
accomplish this object by the use of a shunt coil or coils on the electro-magnets
carrying a reversible current increasing or diminishing the magnetisation according
to the direction of the current, and by means of which I couple in parallel with the
Dynamo, or Dynamos, a secondary battery or accumulator or its electrical equivalent
of the requisite electro-motive-force in such a manner that should the E.M.F. rise
above the normal from increase of speed or other cause the current in the said coil or
coils would be in the reverse direction to that in the other or exciting coils and would
have the effect of diminishing the magnetisation and thus reducing the E.M.F. If
on the contrary from diminished speed or other cause the E.M.F. fell below the
normal the current would be in the same direction as that in the other or exciting coils
increasing the magnetisation and thus also the E.M.F.
A similar arrangement is applicable for maintaining a uniform Electro-motive
force between two or more Dynamos coupled in parallel. In this case the secondary
battery may be omitted, the Dynamos acting as regulators to each other by being
connected at the brushes and the connexions carried as shunt coils round the Field
Magnets of each in such a manner that when the E.M. F. of either exceeds that of
the others the direction of the current would be such that the magnetisation of its
Field Magnets would be diminished whilst that of the others would beincreased. On
the other hand if the E.M.F. of either fell below that of the others the reverse would
take place but without the accumulator or its electrical equivalent the E.M.F of all
the Dynamos coupled in parallel may rise or fall together.

page_text: A Method of Regulating the Electro-motive Force of Dynamo-
electric Machines.
I, FREDERICK GEORGE of Uley Lodge, Uley in the County of Gloucester Doctor of
Medicine 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 :-
This invention has for its object the maintaining an approximately uniform Electro-
motive force notwithstanding variations in the speed of the Dynamo or of the external
resistance or other cause and I accomplish this object by the use of a shunt coil or
coils on the Electro Magnets carrying a reversible current increasing or diminishing
the Magnetisation according to the direction of the current and by means of which
couple in parallel with the Dynamo or Dynamos a secondary battery or accumulator
or its electrical equivalent of the requisite electro-motive force in such a manner that
should the electro-motive force from increase of speed or other cause rise above the
normal the current in the said coil or coils would be in the reverse direction to that in
the other or exciting coils and would have the effect of diminishing the magnetisation
and thus reducing the electro-motive force. If on the contrary from diminished speed
or other cause the electro-motive force fell below the normal, the current would be in
the same direction as that in the other or exciting coils, increasing the magnetisation,
and thus also the electro-motive force.
1
A similar arrangement is applicable for maintaining a uniform electro-motive force
between two or more Dynamos coupled in parallel. In this case the secondary battery
may be omitted, the Dynamos acting as regulators to each other by being connected
at the brushes and the connections carried as shunt coils round the Field Magnets of
each in such a manner that should the Electro-motive force of either exceed that of
the others the direction of the current would be such that the magnetisation of its
Field Magnets would be diminished whilst that of the others would be increased. On
the other hand if the Electro-motive force of either fell below that of the others the
reverse would take place, but without the accumulator or its electrical equivalent
the Electro-motive force of all the Dynamos so connected may rise or fall together.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is :-
--
1. The use of a coil or coils on the Field Magnets carrying a reversible current
increasing or diminishing the magnetisation according to the direction of the
current.
2. The use of Electric Accumulators or Batteries coupled in parallel with a Dynamo
or Dynamos by means of such a coil or coils.
3. To couple two or more Dynamos in parallel by means of such a coil or coils, all
substantially as described.
Dated this 92-d dow of February 1888