Improvements in Alternating Electric Current Transformers.
Year: 1894

page_text: Date of Application, 2 st Dec., 1894
Complete Specification Left, 14th Sept., 1895-Accepted, 2nd Nov., 1895
PROVISIONAL SPECIFICATION.
Improvements in Alternating Electric Current Transformers.
We ALEXANDER BEWIOKE BLACKBURN of Bushbury Works, Wolverhampton
in the County of Stafford, Civil Engineer, and WILLIAM BUCHANAN of Bushbury
Works, aforesaid, Electrical Engineer, do hereby declare the nature of this
invention to be as follows.-
The object of this invention is to reduce the length of both the iron and copper
circuits in alternating current transformers thereby decreasing cost and increasing
officiency.
According to this invention we form the magnetic circuit of rings of thin plates
or laminations which are cut through or divided at one place or at soveral
places the cuts or divisions being in any convenient direction such as radial or in
a tangential line for example so that they can be slipped or placed round the
copper coils which copper coils are wound so that they ate of circular cross section
corresponding to the ner circle of the ungs or laminations constituting the
magnetic cucuit the copper coils filling the interior of the said rings or
laminations.
Dated this 21st day of December 1894.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Alternating Electrio Ourrent Transformers.
We, ALEXANDER BEWIOKE BLACKBURN of Bushbury Works, Wolverhampton
in the County of Stafford, Civil Engineer and WILLIAM BUCHANAN of Bushbury
Works aforesaid, Electrical Engineer do hereby declare the nature of our invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement
-
The object of this invention is to reduce the length of both the iron and copper
circuits in alternating current transformers thereby decreasing cost, and mcreasing
efficiency.
According to this invention the magnetic cu cunt is formed of rings of thin plates,
oi laminations, or stampings, which are cut through, or divided, at one place, or at
two, or more, places (being then held together by any suitable, clamping means)
the cuts, or divisions being in any convenient direction such as radial, or in a
tangential line, for example, so that they can be shipped, or placed, 1ound tho
copper coils, which copper coils are wound so that they are of circular cross
section, coresponding to the inner circle of the laminations, plates, or stampings,
constituting the magnetic circuit, the copper coils filling the interior of the said
laminations plates or stampings
The accompanying drawing is a transverse section of a coil made in accordance
with this invention, the sections of the wires of the coil being only in part shewn,
the rest being indicated by cioss lines

page_text: The copper coils are marked A. The wes or conductors, forming the coilings
are arranged so that the coil, as a whole, presents a circular cross section, which
enables the laminations, plates, or stampings B, constituting the magnetic circuit,
to be of corresponding circular form which reduces the length of both the copper
and iron cncuits. The lamination plate or stamping B on one side is shewn with
a radial slit, aud that on the other side with a tangential slit, to enable them to be
aprung over the coils A
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what we
claim 16
1
An alternating electric current transformer having the copper coils arranged in
circular cross section and the interiors of the laminations, plates or stampings
constituting the magnetic cn cuit, of corresponding cucular form substantially as,
and for the purpose hereinbefore described
Dated the 14th day of Sentenher 1895
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.