Improvements in Dynamo Electric or Electro Dynamic Machines.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Dynamo Electric or Electro Dynamic Machines.
I, JOHN GRICE STATTER, of 68, Victoria Street, Westminster, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
:-
My invention relates to the construction of dynamo electric or electro dynamic
machines in which there are two armatures & one set of field magnets. In
my invention the field magnets have one magnetising coil only and the two
armatures and the said magnetising coil have a common axis.
There is an iron core within the said magnetising coil-hereinafter called the
inner core and this is provided with two pole pieces one at either end situated
beyond the end of the magnetising coil. Of these two pole pieces one is set
out to one side of the common axis and the other is set out to the opposite side.
There is also an iron core without and enclosing the magnetising coil like a
sheath & it is hereinafter called the outer core.
This core also has polar extensions the one being set to one side of the common
axis and the other to the opposite side. The two pole pieces which are brought
out, one from the inner core and one from the outer core and both of which
are situated at one end of the magnetising coil, face towards one another upon
opposite sides of the common axis are so shaped to form the two pole pieces
of opposite magnetic polarity between which any suitable armature can be
placed.
Similarly, the two pole pieces which are brought out, one from the inner core
and one from the outer core and both of which are situated near the end of the
magnetising coil remote from that end above referred to, face towards one another
upon opposite sides of the common axis and are so shaped to form the two pole
pieces of opposite magnetic sign. between which any suitable armature can be
placed.
The polarity is given to these pole pieces by the excitation due to the said
magnetising coil.
The poles and their cores may be said to form a figure crossed over after the
manner of a pair of scissors.
Suitable armatures to run between the pole pieces are provided and these and
their bearings and other accessories are of known patterns.
The outer and inner cores are secured to one another by non-magnetic material
at their pole pieces.
The inner and outer cores and their pole pieces can be constructed of any
suitable magnetic material.
Dated this 1st day of May 1899.

page_text: Improvements in Dynamo Electric or Electro Dynamic Machines.
boselige to c
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I, JOHN GRICE STATTER, of 6S, Victoria- Street, Westminster, in the County
of London, 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: TTC
My invention relates to the construction of dynamo electric or electro dynamic
machines. In my invention the field magnets have one space for a magnetising
coil or coils excited in any suitable manner. Referring to the drawingsFig.1
is a side elevation in section of a machine constructed according to my invention.
Only the essential parts are shewn. The machine is shewn in Fig. 2 in side
elevation and is arranged so that one set of field magnets excite two armatures.
The said armatures and their accessories are constructed in accordance with
known practice & are not shewn in either of the drawings, but are intended to
run within the polar cavities between B and D and 1 & B" respectively and
to have a common axis with the magnetising coil Z. There is an iron-or
other suitable magnetic material-core within the said magnetising coil..which
is hereinafter called the inner core. This core is provided with two pole pieces
one at either end and situated beyond the end of the magnetising coil. Of
these two pole pieces one is set out to one side of the common axis, and the
other to the other side. There is also an iron core without and enclosing the
magnetising coil like a sheath and this core is hereinafter called the outer core.
It has also two polar extensions one on either side of the axis of the said cores..
The two pole pieces which are brought out one from the inner and one from
the outer core, and both of which are situated at one end of the magnetising
coil, face towards one another upon opposite sides of their common axis and
are so shaped as to form the pole pieces of opposite magnetic polarity between
which any suitable armature can run.
1.].
Similarly, the two pole pieces which are brought out, one from the inner core
and one from the outer core and both of which are situated near the end of the
magnetising coil remote from that end above referred to face towards one
another upon opposite sides of their common axis and are so shaped to form the
two pole pieces of opposite magnetic sign between which any suitable armature
can be placed.
Referring again to the drawings, in Figs. 1 and 2 similar letters refer to
similar parts; A is the inner core. B₁ and B" the two pole pieces carried by it
and which are magnetised by the coil Z in the opposite sense. C is the outer
core having, pole pieces D and D.
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The poles and their cores may be described as forming a figure crossed over
after the manner of a pair of scissors.
Suitable armatures to run between the pole pieces are provided, and the outer
and inner cores are connected mechanically by non-magnetic material. Shaped
into distance pieces and bolted up between the poles B and D and also
between D and B or in any convenient manner.
!
It is not essential to the working of my improved field; magnets that there
should be two, armatures-obviously if I short circuit (magnetically) the poles B¹
& D, the machine will still be complete with one armature to run between Bu
& D¹.
It is also to be noted that this armature could run with its axis at right angles
to the axis of the magnetic cores, by a suitable alteration in the shaping of
B1 and D.

page_text: The inner and outer cores and their pole pieces can be constructed of any
suitable magnetic material, and the same need not be uniform throughout the
whole magnetic circuit.
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:-
I. In a dynamo electric or electro dynamic machine, field magnets arranged
with an inner and an outer magnetic core with a magnetising coil or magnetising
coils between them, and with suitably shaped pole pieces set on either side of
the axis of the field magnets, and leaving between them a suitable space for
an armature or armatures to revolve substantially as described.
II. The specific form of field magnet shewn in Figures 1 and 2.
1
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