Year: 1886

page_text: I, WILLIAM STANLEY, Junior, of Great Barrington, Massachusetts, United States
of America, 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 apparatus employed for converting electric
energy from currents of a given potential to currents of a different potential or
different quantity.
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, aud
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 currents 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 winding the primary and secondary conductors upon a
suitable form which may with advantage, be octagonal, and mounting upon the coil
or core of wires thus formed by the primary and secondary conductors, annular
discs or rings of magnetic material. These discs are applied by being formed with
central openings of such size as to receive the wire and they are cut open upon one
side. By springing the two ends thus formed laterally they are slipped over the
core of wire and thus caused to surround the conductors.
In the accompanying drawing figure 1 is a plan view of an induction coil
constructed upon this principle, and figure 2 is a cross-section of a portion of
the same.
Referring to the figures, a' and a² represent the terminals of the primary
conductor A and 61 and 62 the terminals of the secondary conductor B. These

page_text: conductors are wound upon a suitable forming block into an annulus which may be
circular or as shown in the drawing, of an octagonal form. The ends of the
conductors are secured to suitable binding posts. The conductors having been
thus formed, the iron to be acted upon by the primary conductor and in turn to
act upon the secondary coils, is placed in position. It consists of a series of
discs cc which are separately formed. Each disc has an opening through the
centre as shown at d of such size as to admit tho core of wire, and a slot or
opening d¹ is cut from the centre to the periphery. The cuts or slots in the
discs may be made of such width as is desirable to enable the discs to be easily
placed upon the core of wire and I prefer to place the discs on the core in such
positions that successive slots shall not be in apposition. By springing the ends e
and easide or in opposite directions, the discs may be placed one at a time upon
the coils. They are preferably separated from each other by non-magnetic
material for the purpose of rendering the coil capable of more rapid magnetization
and demagnetization. In the drawing the discs are represented in eight groups,
wedge-shaped openings being left between each of the successive series, but the
coils may, if desired, be formed in a ring and the discs instead of being exactly
parallel may then radiate from a common centre, or smaller discs may be applied
through the wedge-shaped portions formed in the construction illustrated in the
drawing.
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;
t
"
1. The combination, substantially as herein before set forth, with the primary
and secondary conductors of an induction coil wound to form an annulus, of a
series of slotted plates of soft-iron through which the conductors extend:
2. The combination, substantially as herein before set forth, of a series of
magnetically separated discs or plates of soft-iron, each having a radial slot, and
primary and secondary conductors extending axially through the same, substan-
tially as described.
Dated thin 01st L
HERBERT J. ALLISON,
Agent for the Applicant.