Year: 1886

page_text: I, WILLIAM STANLEY, Junior, of Great Barrington, Massachusetts, United States
of 'América, 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:
My invention relates to the class of electrical apparatus employed for trans-
forming electric currents of a given character into currents of different form.
In the conversion of electrical energy from currents of a lower to a higher
potential and vice versa, by means of induction coils, it is desirable that the
quantity of iron acted upon by the currents in the primary circuit and in turn
reacting upon the coils in the secondary circuit, should be as great as possible, and
that the iron itself should be divided into thin laminae or plates rather than united
in a solid mass and it is also desirable that the parts be so organized as to render
the construction of the coil as simple as possible.
The object of my invention is therefore to provide a form of induction coil in
which the magnetizable portion is formed of thin plates of soft-iron adapted to
support the primary and secondary conductors in such manner that they shall be
as nearly as possible surrounded by magnetic material, and shall be so located that
the current traversing the primary shall be expended to the best advantage in
magnetizing the iron, and that the magnetization and demagnetization of the iron
shall be utilized to the best advantage in establishing induced currents in the
secondary coils.
My invention consists in constructing the core of the coil from thin plates of
magnetic material, each provided with one or more slots or narrow cuts for
receiving the primary and secondary conductors. These plates are bolted together
side by side with the openings for receiving the wire in alignment with each other,
but they are separated from each other by washers or plates of non-magnetic
material. The coils of wire are wound in the openings formed in the plates and
are thus bounded upon both sides by soft iron.
:
In the accompanying drawing, tigure 1 is a side elevation of an induction coil
constructed upon this plan and figure 2 is a transverse section of the same.
Figures 3 and 4 are respectively similar views of a modified form.
f

page_text: Referring to the drawings a¹, a², a³ etc., represent a series of plates of soft-iron
which are fastened together side-by-side by bolts b¹, 63, 63 and 6. These plates are
separated by washers c which intervene between the respective plates and prevent
them from coming into contact with each other. The bolts themselves are pre-
ferably surrounded by sleeves or tubes of non-conducting material which prevent
them from coming in contact with the plates and thereby placing them in
magnetic connection with each other. In the form shown in figures 1 and 2 each
plate is constructed with two narrow slots e¹ and e2 cut from the opposite ends, and
when the plates are fastened together the slots e¹ in all the plates are in alignment,
and likewise the slots e. Against the ends of the series of plates there are placed
blocks g¹ and g² of wood or other suitable material around which the wire is
wound.
One of the conductors, say the primary conductor f¹, is wound through the slots
and occupies about one half the space in each slot. The secondary conductor f2, is
then applied, being wound in like manner until the slots are entirely filled. It will
be apparent that if the wire be of a thickness equal to the width of the slot, then
but one line of convolutions will be formed and each wire will have magnetic
material upon opposite sides.
The wire may be less in thickness than the width of the slots and two or more
lines of convolutions of either or both the primary and the secondary conductors
may thus be made. On the other hand the primary and secondary conductors may
be of different sizes, so that there will be but one line of convolutions of one
conductor and two or more of the other. It is not necessary that the primary
conductor should be inside and the secondary conductor outside, but the relative
positions may be reversed and they may be arranged in any well known manner
relatively to each other. Still another modification is to make the outer portion of
the slot wider than the inner, as shown in figure 4 and to employ, in connection
therewith, any of the methods of winding which have been already mentioned, or
a conductor of the width necessary to fill the narrower or inuer portion may form
one coil, and a thicker conductor filling the outer space be employed as the other
conductor.
The form of induction coil shown in figures 3 and 4 differs from that first
described in that each plate consists of one-half the plate shown in figure 2, and the
series of plates are arranged in the circular form and held in place by two clamping
plates K and K2, which are preferably of non-magnetic material. These plates are
constructed with annular lugs and k which project into corresponding grooves
or notches ³ and formed in the edges of the plates. The inner ends of the
plates may with advantage be separated by wedge-shaped blocks m and m of non-
magnetic material. The plates being arranged in position the two supporting
plates K and K² are secured together by a bolt K. The wire is then wound
circumferentially in the alots or openings e¹ el in the same manner as described
with reference to figures 1 and 2.
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. An induction coil consisting of a series of plates, each having one or more
slots cut therein, and two coils of wire constituting primary and secondary con-
ductors wound in said slots.
2. An induction coil consisting of a primary and a secondary coil each wound in
a single tier of convolutions, and magnetic material upon opposite sides of each
series of convolutions.
3. The combination, substantially as hereinbefore set forth, of a series of plates
of soft-iron each having a narrow slot formed therein, means for supporting said
plates with the slots in alignment, and primary and secondary conductors wound in
said slots, substantially as described.

page_text: 4. The combination, substantially as herein before set forth, of a series of plates
magnetically separated from each other, an opening or slot formed in each plate the
width of each opening being greater through its outer, than through its inner
portion, and primary and secondary conductors wound in said slots.
5. The combination, substantially as hereinbefore set forth, of an annular series
of plates each containing a narrow slot, means for supporting the plates and
primary and secondary conductors wound in said slots and filling the same,
substantially as described.
HERBERT J. ALLISON,
Agent for the Applicant.