and Electro-dynamic Machines.
Year: 1887

page_text: Date of Application, 4th Jan., 1887
Complete Left, 4th Oct., 1887
Complete Accepted, 11th Nov.,
1887
Corio and Electro-dynamic Machines.
I, WILLIAM ADOLPH LEIPNER of No. 47 Hampton Park, Clifton, Bristol in the
County of Gloucester, Electrician do hereby declare the nature of this invention to be
as follows:-
This invention relates to the construction of the revolving armatures of dynamo-
electric or electro-dynamic machines, the chief objects in view being to provide a
number of bobbins easily and cheaply made and wound, held firmly but removeably
between magnetic spokes, both the iron cores of the coils and the magnetic spokes
being made up of numerous plates of iron. I provide a nave of non-magnetic
material such as gun metal, I cut a number of equidistant notches in the periphery of
the nave, each notch being of dovetail character that is to say wider at is bottom than
at its mouth. I punch or cut out of sheet iron a number of plates of trapezoidal form,
each having one part which is to be the outer part wider than that which
inner part, having also an indentation along cach side and having its extreme inner
to be the
end made to fit the notches of the nave. I rivet together a number of these pieces
of plate face to face and thus form a magnetic spoke, and make as many such composite
spokes as there are notches of the nave.
When all these spokes are fixed in the notches of the nave there is left between
each pair of them a space to receive a bobbin, this space being of the same width at
he top and the bottom, but wider at its middle by the depth of the indentations formed
n the plates of which the spokes are composed. The bobbins which are introduced
between the spokes consists, each of a core of square section with its corners a little
ounded, made up of iron plates placed side by side and rivetted together and coiled
vith insulated wire in such a manner that the two ends of the core project a little
eyond the coil on each side of it. Each bobbin is introduced sideways between two
f the spokes, the wire coil fitting in between the parallel parts of the space between
he spokes, whilst the projecting ends of the core fit into the indentations of the spokes.
he bobbins thus introduced into the spaces between the spokes abut on the one side
gainst the projecting lip of a ring which is fixed on the one side of the nave, and
ch bobbin is held in position by a bracket which is fixed on to the other side of the
[Price 8d.]

page_text: navo. Thus the composite magnetic spokes being firmly held in the dovevan
of the nave, and the bobbins being firmly held by the engagement of their cores in
the indentations of the spokes, the bobbins cannot be thrown out by centrifugal force
when the armature rapidly revolves. At any time, by removing the bracket which
bears against one side of a coil, that coil can.be withdrawn sideways from between the
spokes without affecting the structure of the rest of the armature. The composite
spokes being all made exactly alike; and also all the bobbins and their cores being
alike, any spoke can fit into any notch of the nave, and any bobbin can fit between
any two of the spokes. For economy of manufacture the spokes, instead of being
fitted into notches cut in the nave, may be all set in their places in a framing placed
in the mould in which the nave is cast, and the metal of the nave may then be cast
round their ends.
The wires of the coils are connected in any suitable known way to the plates of a
commutator of ordinary construction, arranged to suit the polar fields and the character
of the currents produced or employed.
There may be two, four or a greater oven number of polar fields between which the
coils revolve, the magnetic pole pieces forming these fields being preferably made of
such shape that they closely embrace without touching the two sides and outer faces
of the bobbins.

page_text: COMPLETE SPECIFICATION.
An Improvement in Dynamo-electric and Electro Dynamic Machines.
I, WILLIAM ADOLPH LEIPNER 47, Hampton Park, Clifton Bristol in the County of
Gloucester, 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 :-
This invention relates to the construction of the revolving armature of dynamo-
electric or electro dynamic machines in such a manier as to accomodate a large
number of coiled bobbins each easily and cheaply constructed, held firmly but
removeably between magnetic spokes which, as well as the cores of the coils, are made
up of numerous plates of iron. The bobbins being all equal and similar and the
composite spokes which are interposed between them being also equal and similar,
any composite spoke can be fitted at any part of the circumferance of the armature,
and any bobbin can be fitted between any pair of spokes. Also a bobbin can at any
time be taken out and replaced without affecting the general structure of the
armature. The accompanying drawings represent part of an armature constructed in
this manner.
Fig. 1 represents one quarter of the armature in front view some of the bobbins are
shewn in position, some of the spaces for bobbins between the spokes are shewn empty,
and part of the ring for holding the spokes is broken off to shew the engagement of
the spokes with the nave.
Fig. 2 is a section on the radial plane X X.
Fig. 3 is a section on Y Y.
A is a nave of non-magnetic material such as gun-metal, at equal distances around
its circumference are formed notches a a each wider at the bottom than at the mouth.
As a convenient way of forming these notches each is made of the shape shewn by
having the circular hole a through the metal of the nave parallel to the axis, and then
slotting out the narrower mouth a¹. Pieces are cut or punched out of sheet iron,
each piece of the form B and a number of these pieces along with a few shorter
pieces B', at each side of them, are rivetted together with air spaces or a thin layer of
insulating material between them to form one of the spokes, the rivets used being
insulated from the pieces of metal.
Each composite spoke thus formed is fitted into one of the notches a a¹ and projects
beyond the circumference of the nave A.
Between each pair of spokes there is a space to receive one of the bobbins, the
outer and inner parts of this space at c c¹ being of equal width, but the middle part of
this space being wider in consequence of the indentations 6 of the spokes B. The
core of each bobbin consists of a number of iron plates placed side by side with a thin
layer of insulating material between them. The core thus forined has a transverse
section which is square with the corners, a little rounded off and has a longitudinal
section which fits between the indentations & of each pair of the spokes B. The core
is wound round with insulated wire D and the whole constitute a coil or bobbin flat on

page_text: its four sides with rounded corners. This bobbin is introduced laterally between two
of the spokes B the ends of the core C fitting into the indentations b and the wire coil
fitting between the parallel parts c c of the space between the spokes. E is a ring
fixed on the one side of the nave with a projecting rounded lip e against which bear the
curved corners on one side of the bobbins. Another ring F is fixed on the other side
of the nave.
These two rings E and F cover on both sides the notches a a¹ in which
the spokes B are inserted. Brackets G one for each bobbin, are fixed on the ring F,
the brackets have rounded lips g which bear against the curved corners of the bobbins.
On removing one of the brackets G the bobbin against which it bore can be drawn
out laterally from between the spokes, and when a bobbin is introduced laterally
between the spokes, it is secured in position by screwing on the bracket G to bear up
against its corner.
From the construction described it will be seen that the bobbins D, while they are
held side-ways by the lips e and g are held radially against contrifugal force by the
engagement of the ends of their cores c in the indentations of the spokes B, also
that these spokes, while they are held sideways by the rings E and F are secured
radially by the insertion of their enlarged ends in the holes a of the nave. The plates
which constitute the spokes B being mostly all of the same shape in each spoke, and
the shorter plates on each side, being of the same shape for one spoke as for another
can be punched out of sheet metal. In the same way the plates which constitute the
cores C can all be punched out of sheet metal and each composite core can be held in
a suitable revolving chuck engaging both its ends to have the coil wound on to it. In
this manner the manufacture of the armature consisting mostly of a repetition of
operations with a set of suitable tools, is rendered comparatively inexpensive, and all
the parts being made to gauge, any spoke or any bobbin will fit at any part of the
periphery of the nave.
In employing an armature of the kind described, the polar fields of the machine
may be arranged in any suitable manner; preferably they should be so shaped as to
fit nearly to the two sides and outer face of the bobbins, so as to render effective the
greater part of their coils. The wires of the coils may be connected in the usual way
to commutator plates arranged to suit the polar fields and the character of the currents
that are generated or utilised.
In some cases in order to cheapen manufacture I dispense with the outer plates B¹
of the spokes, so that each complete spoke having the same thickness as the cores of
the bobbins consists only of the plates B all of one size and shape.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed I declare that what I claim is :—
A revolving armature for a dynamo electric or electro dynamic machine, consisting
of a non-magnetic nave having in its periphery equidistant notches each wider at the
bottom than at its mouth, in each notch a composite spoke consisting of numerous
iron plates rivetted together and presenting indentations on its sides, and between the
spokes bobbins of insulated wire coiled on composite cores which are made up of
numerous iron plates and are so shaped that their ends fit into the indentations of the
spokes the bobbin spokes being retained laterally by rings and brackets fixed on
the sides of the nave.
ABEL & IMRAY,
Agents for the Applicant.