Improvements in and connected with Armature Cores of Permanent Magnet Dynamo Electric Machines.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with Armature Cores of Permanent
Magnet Dynamo Electric Machines.
JAMES MOORES and HENRY OLIVER FARRELL, both Electrical Engineers, of
15, Hanging Ditch, Manchester, in the County of Lancaster, do hereby declare
the nature of this invention to be as follows:-
Our invention relates to improvements in and connected with armature cores
of permanent magnet dynamo electric machines, of the type commonly known as
shuttle, H, or Siemens armature. The object of our invention is to reduce weight,
secure space for a greater number of turns of wire, and simplify & cheapen con-
struction.
We
We carry out our invention by making our armature core in the following
manner: We take two identical strips of thin or sheet iron, and bend over
both ends of each in the same direction, and to such a shape, that when the two
strips are fastened back to back, with the respective edges of their straight parts
parallel, the two bends at either end of the united strips, shall together form
an are shaped pole face, corresponding to the pole face of an ordinary shuttle, H,
or Siemens armature.
We may instead of using only one pair of iron strips, use two or more pairs, or a
number of iron wires, bent and fixed in a similar way.
We may make the iron strips herein before mentioned of a less width at their
central portions than at their ends; in which case we may compensate for the
reduced mass of metal, by increasing the thickness at these central parts, by
means of attaching short strips of thin or sheet iron along them, or by thicken-
ing these said central parts in some other convenient manner. We mount our
armature core on to a spindle or shaft in a suitable manner.
Dated this 27th day of July 1897.
Improvements in and connected with Armature Cores of Permanent
Magnet Dynamo Electric Machines.
We, JAMES MOORES, and HENRY OLIVER FARRELL, both of 15, Hanging Ditch,
Manchester, in the County of Lancaster, Electrical Engineers, do hereby declare
[Price 8d.]

page_text: 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; -
_
Our invention relates to improvements in and connected with armature cores
of permanent magnet dynamo electric machines of the type commonly known
as shuttle, H or Siemens armature.
The object of our invention is to reduce weight, secure space for a greater
number of turns of wire, and simplify and cheapen construction.
Our invention will be readily understood from the following description on
reference to the accompanying sheet of drawings.
Fig. 1 is an edge view, and Figs. 2 and 3 side views seen from planes at right
angles to each other of one of our improved armature cores.
Fig. 4 shews a modification hereafter more particularly referred to.
We take two identical or suitable strips of thin or sheet iron and bend over
both ends of each strip in the same direction and to such a shape as seen at
Fig. 1, that when the two strips are fastened back to back (see Fig. 1) with the
respective edges of their straight parts a al parallel or coinciding with one
another, the two bends at either end of the united strips shall together form an arc
shaped pole face as seen at a corresponding to the pole-face of an ordinary
shuttle H or Siemens armature.
We may instead of using only one pair of iron strips, use two pairs as indicated
by the dotted line of junction a² Fig. 3 (or more than two pairs) or a number of
wires bent and fixed in a similar way to that shown at Fig. 1.
We may make the iron strips a a of a less width at their central portions a a¹
than at their end a as seen at Figs. 2 and 3.
In this case we may compensate if requisite for the reduced mass of metal by
increasing the thickness at these central parts, by attaching short strips 6 61 (equal
in length to the central parts of a a¹) of thin or sheet iron along the said strips
or by thickening the said central parts in some other convenient manner.
We provide a hole or boss c for mounting our armature on a spindle or shaft
in any suitable manner, say as seen at Fig. 1 or Fig. 4.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is_to_be_performed we declare that what we
claim is:-
An armature core formed by two strips of thin or sheet iron bent over at both
ends of each strip and fastened back to back, the two bends at either end of the
united strips together forming an are shaped pole face, substantially as herein-
before described.
Dated the 22nd day of April 1890.
GEO. DAVIES & SON,
Agents for the Applicants, 4, St. Ann's Square, Manchester.