Improvements in Regulators for Alternating Currents
Year: 1895

page_text: Date of Application, 22nd Oct, 195-Accepted, 23rd Nov., 1395
COMPLETE SPECIFICATION
Improvements in Regulators for Alternating Currents
I, JAMES DEVONSHIRL, Secretary of The Buitish Thomson Houston Limited of
38 Parliament Street, Westminster, London (a communication from abroad by
Charles P Stemmetz, Electrical Engineer, of Schenectady in the State of New
York, United States of America) do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and
ascertamed m and by the following statement
The present invention relates to alternating current systems of distribution; and
has for its object to provide a means of regulating the potential in parts of such
systems, and particulai ly in the feeders, by means simple and effective, yet admitting
of vauations of potential either up or down from that of the main generator. Foi
the purpose set forth I employ a coil in series with the main circuit or feeder, and
a second coil in shunt thereto, hereinafter I call the serios coil the "secondary,"
and the coil in shunt the " primary.' The pinay coils is preferably wound wich
a considerable number of turns of comparatively fine wire, and the secondary of
fewer turns of a coarser wie
The mechanical construction is somewhat similar to
that of the well-known induction motor, in that I use a closed magnetic structure
o ring, of laminated iron, in the interior face of which the coils are received
Within the coils and surrounded by them I place a revoluble non amature, which
I may call a magnetic badge, by revolving which I may alter the magnetic circuits
of the apparatus without altering the position of the coils, and thus may effect the
hanges of potential desued To prevent leakage of magnetic Imes of force, ot,
as it is sometimes called, "stray field," in which the lines do not cut both coils,
I use amgnetic shield of copper or other nou-magnetic metal, although the
apparatus may be designed for successful operation without this precaution It is,
however, preferably employed.
The accompanying diawings show an embodiment of my invention, Fig. 1 being
a side elevation of the essential parts of the apparatus Fig 2 an end elevation,
Fig. 3 a diagram of the encunts, ind Fig 4, 5 and 6 being explanatory diagrams
showing the conditions of operation
Ju Figs 1 and 2, C is a structure of laminated non, A is the primair coil
composed, as already pointed out, of a number of tuins of comparatively bne wire
and coupled in shunt across the mains Ananged at an angle of 90° to the primary
the secondary call B in scries with the mains; upon a shaft D is mounted a
shuttle (as I prefer to call it), H, of laminated non forming a magnetic budge
which is the movable element of the magnetic encuit Upon each side of the
huttle are copper plates I, I, so that the whole forms substantially a cylinder
occupying the other wise vacant space in the laminated on structure C.
In Fig 3 the encunts of the apparatus are represented, the coil A being shown
in shunt to the mains F, G from the generator E, and the coil B being in selles
with the main F.
Referring now to Figs. 4, 5 and 6, I illustrate the operation of the apparatus
In these figures, the rectangle I represents the shuttle or movable portion of the
magnetic structine, and the pumary and secondary coils are lettered A and B, as
n the mechanical homes. The nections of the caved anows represent the
direction of the magnetic lines of force, ot, as It is commonly called, the
magnetic flux.'
"
In Fig. 4. which corresponds to the position of the annaratus illustrated in F 1.

page_text: the duection of the magnetu lines is such as to assist the electro-motive force in the
coil B, the pumaly coil A setting up alternations of magneto-motive force in
the magnetic structure, which by the position of the movable element H are so
duected as to assist the coil B on generate in it electro-motive force in addition to
that already existing In Fig 5, however, the shuttle coincides in direction with
one of the coils and the magnetic flux therefore coincides in the two coils with then
axe, so that no effect is produced by the apparatus, the electro-motive force
between the mains being neither raised nor lowered. In Fig 6, however, the
movable element H is at a right angle to its former position, and the effect of the
secondary coil B is reversed, magnetic lines cutting it in the opposite direction and
setting up in it a counter electro-motive force tending to cut down the effect of that
coil and diminish the potential in the circuit
In connection with these figures and with Fig 1, the office of the copper plates
or bands upon the laminated sluttle or movable magnetic element II will be readily
understood The curent generated in these copper plates tend to set up a field of
force which, in accordance with well-known principles, acts to "beat back" or
deflect the magnetic lines tending to pass through the plates and thus, (iefering to
Fig 1) the encuit would be one end of the shuttle H (for instance the upper end),
around through the lantunted structure C, passing outside of the coils B to the
lower end of the coil A, returning into the other end h of the movable magnetic
element, the copper in the lower part of the movable element acting to prevent the
lines passing in then encuit between the coils B and A, and compelling them to
make a complete circint
Although illustrated herein with reference particularly to a single phase alter-
nating circuit, it is manifest that by ordinary modifications within the scope of the
electrical engineer, I may apply my device to circus of other numbers of phases,
o may embody it in a structure having more than the two poles illustrated, its
proportions may be varied within reasonable limits to obtain any effect dested, and
all such modifications of changes aim to embrace in the claims, which include in
then scope any structure in which, by changing the path of the magnetic lines of
Juice between the series and the shunt coils (the coils being preferably stationary)
to correspond to varying conditions of running, and thus causing more or less of
them to cut the series coil in either one direction or the other, the electro-motive
foice between the mains is raised or lowered from that usually maintained by the
generatoi
Having now particularly described and ascertained the nature of the said myen-
tion and what manner the same is to be performed as communicated to me from
abroad declare that what I claim is.
1. The method of regulating the electio-motive force supplied to an alternating
current system of distribution, which consists in varying the path of the magnetic
Iines of force passing between stationary coils in inductive relation, part of the coils
in series in the man en cuit, the remainder in shunt thereto, thereby causing more
a less of the lines to cut the series coil in one or the other direction as desired,
thus developing an electro-motive force therein either assisting or counteracting
the main potential
'
!
2. A feeder regulator for an alternating current system of distribution, com-
prising a secondary coil in series in the mains, a primary coil in shunt thereto, the
oils being stationary and arranged at an angle of 90°, and a magnetic structure
surrounding the coils and provided with a rotatable member adapted to vary the
ath of the lines of force and thereby the inductive effect of one cou upon the
other
3. A feeder regulator for an alternating current system of distribution, composed
of two stationary coils aanged at an angle to each other, a laminated iron
magnetic structure furnishing a path for the lines of force between the coil-, and a
movable magnetic member aanged to vary the path of the lines of force, as set
forth.

page_text: 4. A regulator for an alternating curient system of distribution, compusing a
plurality of coils in inductive relation, part in sues in the main encant, part in
shunt thereto, a magnetic structure surrounding the coils, and a movable magnetic
member enclosed by the coils and adapted to vary the path of the lines of force
and thus the inductive effect of the coils, the movable magnetic member being
composed of laminated iron occupying a part of the opening between the coils and
a non-magnetic shield of good elective conductivity occupying substantially the
remainder of the opening
5. A regulator for an alternating content system of distribution, comprising a
plurality of coils in inductive relation, part in series in the main circuit, part in
shunt thereto, a magnetic structure surrounding the coils, and a movable magnetic
member enclosed by the coils and adapted to vary the path of the lines of force and
thns the inductive effect of the coils. the movable magnetic member being
composed of laminated non occupying a part of the opening between the coils and
a non-magnetic Blueld attached to and moving with the iron occupying substantially
the remainder of the opening
6. An alternating current apparatus, comprising a magnetic structure canying
coils in inductive relation part in series with the mains and part in shunt thereto,
and an element or bridge forming part of the magnetic encuit and movable
elatively to the coils, the bidge vaiying by its changes of position the magnetic
flux between the coils in direction and amount, and thereby regulating the electro-
motive force maintained in the induced coil between maximum in one direction,
and maximum in the other duection, as set forth.
Dated the 2nd day of Databas 1905