Improvements in or relating to Regulating Alternate Current Circuits.
Year: 1892

page_text: Date of Application, 21st July, 1892
Complete Specification Left, 21st Apr., 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Regulating Alternate Current
Circuits.
I, WILLIAM MORRIS MORDEY, of the Victoria Works, Lambeth, in the
County of Surrey, Electrician, do hereby declare the nature of this invention to
be as follows:-
This invention has reference to improvements in or relating to regulating
alternate current circuits the object being to effect the equalisation or proper
proportioning of the current in the internal circuits of alternate current machines
and it is applicable in particular to the armatures of such machines, whether
generators or motors.
In the case of armatures of alternators-for the sake of illustration 1 refer to a
generator--the winding is frequently wound, for convenience and safety, in such a
manner as to place two or more portions in parallel connection. It is necessary in
such cases to exercise great care in the winding or placing of the coils, and in the
arrangement and intensity of the several parts of the magnetic field, to ensure that
the windings which are so connected, shall be equally acted on and shall give equal
currents.
In order to avoid the great care required for this purpose, I attain the desired
object according to this invention by using an apparatus which I term an
"equaliser "and which apparatus consists of coils of wire or other suitable con-
ductor arranged in the fashion of a transformer, preferably with iron so disposed as
to assist the action. The windings or connections are so arranged differentially
that when the currents flowing in the two (or it may be several) portions of the
parallel circuits are equal (or it may be proportionate), the coils of the equaliser
exert no influence upon each other, the magnetism being nil. But in the event of
one portion being stronger than another the equaliser establishes a balance between
the circuits more or less complete according to the proportion borne by the equaliser
to the effect sought to be corrected.
Dated this Q1st day of Tul 1902
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Regulating Alternate Current
Circuits.
1, WILLIAM MORRIS MORDEY, of the Victoria Works, Lambeth in the
County of Surrey, Electrician, 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 reference to improvements in or relating to regulating
alternate current circuits, the object being to effect the equalisation or proper pro-
portioning of the current in the internal circuits of alternate current machines and
it is applicable in particular to the armatures of such machines, whether generators
or motors.
In the case of armatures of alternators-for the sake of illustration I refer to a
generator-the winding is frequently wound, for convenience and safety, in such a
manner as to place two or more portions in parallel connection. It is necessary in
such cases to exercise great care in the winding or placing of the coils, and in the

page_text: arrangement and intensity of the several parts of the magnetic field, to ensure that
the windings which are so connected, shall be equally acted on and shall give equal
currents.
In order to avoid the great care required for this purpose I attain the desired
object according to this invention by using an apparatus which I term an
"equaliser" and which apparatus consists of coils of wire or other suitable con-
ductor arranged in the fashion of a transformer, preferably with iron so disposed as
to assist the action. The windings or connections are so arranged differentially
that when the currents flowing in the two (or it may be several) portions of the
parallel circuits are equal (or it may be proportional), the coils of the equaliser
exert no influence upon each other, the magnetism being nil. But in the event of
one portion being stronger than another the equaliser establishes a balance between
the circuits more or less complete according to the proportion borne by the equaliser
to the effect sought to be corrected.
The accompanying drawing illustrates diagrammatically the application of an
equaliser according to this invention to the armature of an alternator.
A is the armature of the alternator constructed with two windings wand w
which it is required to connect parallel so that they both terminate at the main
terminals T T. To attain the object of this invention an equaliser E having two
coils e and e' wound about a laminated iron core in the manner of a transformer is
used, the coile being placed in the circuit of the armature winding w between the
terminals and T, while the coil e is placed in the circuit of the armature
winding between the terminals and T'. The other ends of the armature
windings w and w' are connected to the main terminal T.
The connections of the equaliser coils e and e' are such that when equal currents
are flowing in the respective circuits Twte T and Tw¹te T¹ the effect of the
coils e and e' is equal and opposite, no magnetism is produced in E, and except for
the trifling loss in the conductors e and e¹, the equaliser has no action. But in the
event of one of the armature windings, w for example having a higher E.M.F. than
the other winding w¹ and tending therefore to produce a larger current, the coils e
and e will not be quite equal, an opposing E.M.F. will be set up in the winding e,
while an assisting E.M.F. will be set up in the winding e', the result being that the
currents in the two branches will be maintained almost exactly equal, the amount
of difference depending on the relation borne by the equaliser to the effect sought
to be corrected.
The drawing illustrates a stationary armature, but the invention may be applied
to a rotating armature by arranging for the required connections. For this
purpose the equaliser may be made to rotate with the armature so as to avoid
additional rubbing contacts, or the equaliser may be fixed and one additional
rubbing contact may be provided. In such a case there would be three rubbing
contacts corresponding to the points T, t and t¹. It will be understood that this
invention tends also to counteract and prevent any circulation of current from one
winding to another of the arinature.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
For the purpose of regulating alternate currents in an alternate current machine
constructed with two or more windings arranged in parallel, the combination with
such windings of an equaliser consisting of coils arranged after the manner of the
coils in a transformer and each placed in series with one of the said windings
substantially as herein described.
This on
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant,