Year: 1886

page_text: Date of Application, 12th May, 1886.
Complete Left, 14th Feb., 1887.
Complete Accepted, 22nd Mar., 1887.
We, JOHN GRICE STATTER, and SYDNEY LINTON BRUNTON, both of Middleton
Road Works, Dalston, in the county of Middlesex, Electrical Engineers do hereby
declare the nature of this invention to be as follows
--
The
Our invention has reference to improvements in the construction of armatures for
magneto or dynamo-electric generators or motors of the Paccinotti or Gramme type.
In carrying out our improvements we construct rings of peculiar shape as herein-
after described and of suitable material, hereinafter called supporting rings.--To one
or more of these rings we bolt the iron rings forming the core of the armature and
hereinafter called the core rings.-The supporting ring or rings is or are generally
rectangular in cross section and have two sets of radial projections, one set projecting
from the exterior circumference and hereinafter called the outer lugs and the other set
from the inner circumference and hereinafter called the inner lugs. Through each
supporting ring or rings bolt holes are drilled in a direction parallel to the axis.
iron core rings have an internal diameter equal to or nearly equal to the internal
diameter of the supporting ring or rings and an external diameter which is equal to or
greater than the external diameter of the supporting ring or rings but not so great as
the external diameter of the supporting ring or rings measured across the outer lugs.
In the iron core rings holes corresponding in number and position to those holes in the
supporting ring or rings are punched or drilled. A suitable number of these core rings
together with one or more supporting rings according to the length and size of the
armature to be constructed are built up together and fastened by bolts passing through
the holes in both core rings and supporting ring or rings. The whole forms a hollow
cylinder firmly held together by bolts and having one or more rings of projecting lugs
on the outer and inner circumferences according as one or more supporting rings are
used in its construction.
For preventing the formation of Foucault or eddy currents in the armature core the
core rings are separated from each other and from the supporting rings by thin layers

page_text: of insulating material and we sometimes employ compound supporting rings each
consisting of a number of similar but thinner rings placed side by side and insulated
from one another. The bolts can be insulated from the core rings and supporting
rings by tubes or sheathings of insulating material; this however applies more
especially to machines having core rings of relatively small radial depth. For machines
having a considerable relative radial depth of core we prefer to place these bolts near
the inner circumference of the rings where they do not cut magnetic lines of force and
in this case we do not provide any sheathing of insulation for them but make them to
tit the holes in the rings tightly.
To attach our improved core to the axle we make use of a central hub suitably
fastened to the axle which hub has radial projections corresponding in number and
position to the inner lugs of the supporting ring or rings. These projections may be
placed so that they form continuations of the inner lugs making complete radial spokes
with a butt joint in each, suitable provision being made for connecting the parts
together and for transmitting the driving force from the axle to the core.
We some-
times make a lap joint in each spoke instead of a butt joint in which case it will be
obvious that both the inner lugs of the supporting rings and the projections on the
hereinbefore mentioned central hub must be made longer and so arranged that instead
of meeting end to end cach inner lug overlaps its corresponding projection on the
central hub and we find it advantageous to drill holes parallel to the axle through the
projection on the hub and inner lug in succession through which bolts are passed
wholly encircled by both the projection from the central hub and inner lug. We
sometimes provide two projections on the central hub for each inner lug so that each
inner lug shall lie between its corresponding pair of projections and the fastening bolt
shall pass through all three pieces.
To ensure the concentricity of the core and the axle the central hub is turned up
between the projections on it and the inner lugs are made long enough to rest upon
this turned up part.
We sometimes drive the armature by providing slots in the hub in a direction
parallel to its axis into which the lugs are fitted.
The function of the outer lug is to provide for the direct driving of the wire wound
upon the core and in which the electro-motive force is to be generated.
Dated 12th day of May 1886.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicants.

page_text: We, JOHN GRICE STATTER and SYDNEY LINTON BRUNTON, both of Middleton Road
Works, Dalston, in the county of Middlesex, Electrical Engineers, 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:-
Our invention has reference to improvements in the construction of armatures for
magneto or dynamo-electric generators, or motors of the Paccinotti or Gramme
type.
In carrying out our improvements we construct rings of peculiar shape, as herein-
after described and of suitable material, hereinafter called supporting rings. To one
or more of these rings we bolt the iron rings forming the core of the armature and
hereinafter called the core rings. The supporting ring or rings is, or are generally
rectangular in cross section and have two sets of radial projections, one set projecting
from the exterior circumference and hereinafter called the outer lugs, and the other set
from the inner circumference and hereinafter called the inner lugs. Through each
supporting ring, bolt-holes are drilled in a direction parallel to the axis.
The iron core rings have an internal diameter equal to or nearly equal to the internal
diameter of the supporting ring or rings, and an external diameter which is equal to
or greater than the exterior diameter of the supporting ring or rings but not so great
as the external diameter of the supporting ring or rings measured across the outer
lugs. In the iron core rings, holes, corresponding in number and position to those
holes in the supporting ring or rings, are punched or drilled. A suitable number of
these core rings together with one or more supporting rings according to the length
and size of the armature to be constructed, are built up together and fastened by bolts
passing through the holes in both core rings and supporting ring or rings. The whole
forms a hollow cylinder firmly held together by bolts, and having one or more sets of
projecting lugs on the outer and inner circumferences according as one or
supporting rings are used in its construction.
more
For preventing the formation of Foucault or eddy currents in the armature core, the
core rings are separated from each other, and from the supporting rings by thin layers
of insulating material and we sometimes employ compound supporting rings each
consisting of a number of similar, but thinner rings placed side by side and insulated
from one another. The bolts can be insulated from the core rings and supporting rings
by tubes or sheathings of insulating material, this however applies more especially to
machines having core rings of relatively small radial depth. For machines having
considerable relative radial depth of core we prefer to place these bolts near the inner
circumference of the rings where they do not cut magnetic lines of force, or we some-
times place the bolts partly within the inner circumference of the core rings running
them in grooves or channels so that they are only partly encircled by the core rings
L

page_text: but wholly encircled by the supporting rings, and in this case a supporting ring is
preferably placed at each end of the armature next the head of the bolt and nut
respectively-
-one or more supporting rings being in addition placed among the core
rings, if necessary, according to the length of the armature, and in this case we do not
provide any sheathing of insulation for them but make them to fit the holes or grooves
in the rings tightly.
To attach our improved core to the axle, we make use of a central hub suitably
fastened to the axle, which hub has radial projections corresponding in number and
position to the inner lugs of the supporting ring or rings. These projections may be
placed, so that they form continuations of the inner lugs, making complete radial
spokes, with a butt joint in each, suitable provision being made for connecting the
parts together, and for transmitting the driving force, from the axle to the core.
We sometimes make a lap joint in each spoke, instead of a butt joint, in which case
it will be obvious that both the inner lugs of the supporting rings, and the projections
on the hereinbefore mentioned central hub must be made longer and so arranged that
instead of meeting end to end, each inner lug overlaps its corresponding projection on
the central hub and we find it advantageous to drill holes parallel to the axle through
the inner lug and the projection on the hub in succession, through which bolts are
passed wholly encircled by both the projection from the contral hub and inner lug.
We sometimes provide two projections on the central hub for each inner lug, so that
each inner lug shall lie between its corresponding pair of projections, and the fastening
bolt shall pass through all three pieces.
To ensure the concentricity of the core and the axle, the central hub is turned up
between the projections on it and the inner lugs are made long enough to rest upon
this turned up part.
In order to enable our invention to be fully understood we will proceed to describe
practical means for carrying it into effect by reference to the accompanying drawing
in which figures 1, 4, and 5 represent longitudinal sectional views illustrating armatures
constructed according to our invention for magneto or dynamo-electric generators or
motors; figures 2 and 6 are end elevations partly in section of figures 1 and 5
respectively; figure 3 is an end view partly in section illustrating various ways of
connecting the inner lugs of the supporting ring to the central hub. Similar letters
in all the figures represent similar parts.
In all the figures B represents the supporting rings and G G are the iron rings
forming the core of the armature and which are bolted to the supporting ring or rings B
and separated from each other and from the supporting rings by thin layers of
insulating material not shewn on the drawing; a, a, are the outer lugs and b, b, the
inner lugs of the supporting rings B; D D are the fastening bolts which we pass
through holes in the core rings G and through corresponding holes in the supporting
ring or rings B, the said holes being parallel to the axis of the armature.
II are the tubes or sheathings of insulating material for insulating the bolts D D
from the core rings G and supporting ring or rings B; A is the central hub which we
fasten to the axle in any suitable manner not shewn in the drawing and whereby we
attach our improved core to the said axle ; c, c, are the radial projections on the hub A
corresponding in number and position to the inner lugs b, b, of the supporting ring or
rings, to which they are fixed by suitable means such as those shewn and which we
will presently describe.
In figures 1 and 2 two projections c, c, are shewn on the hub A for each inner lug b,
which lies between its corresponding projections c, c; C, C, are the bolts passing
through corresponding holes drilled through all three parts the whole forming a kind
of lap joint.
Figure 3 illustrates three different means of attaching the hub A to the inner
lugs b, b, of the supporting ring B by butt joints; this can be effected by a holt as
shewn at C placed with half its diameter in the projection c on the hub A and half in
the inner lug ; or as shewn at E and F, keys of shapes such as those represented can
be conveniently used for a similar purpose in place of the bolt C, the said keys fitting
into grooves in projections c, of the hub A and in the inner lugs b.

page_text: Figure 4 shews the hub A connected to the supporting rings B B by means of a lap
joint only one projection c, being provided on the hub A for each inner lug b.
Figures 5 and 6 shew compound supporting rings B formed of a number of thin
discs placed side by side the said rings being fixed to the hub A in a similar manner
to that shown in figure 4; we prefer to provide armatures constructed in this manner
with one or more spaces between the discs by placing spacing pieces on the bolts D D
whereby free ventilation is obtained. In armatures, however, in which the supporting
rings B are cast in one piece, ventilating spaces can be provided by casting the rings
thinner than the lugs upon them, but more ventilating spaces can be provided in
cases where it is deemed necessary.
We sometimes drive the armature by providing slots in the hub, in a direction
parallel to its axis, into which slots the lugs are fitted. This method of attachment is
similar to that shewn at F in figure 3, but instead of the key F fitting into slots in the
hub and supporting lug, the hub only is slotted and each lug of the supporting ring is
provided with a tongue.
The function of the outer lugs a, is to provide for the direct driving of the wire
wound upon the core and in which the electro-motive force is to be generated. The
armature is wound in a manner similar to that adopted in the Gramme armature.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
1. The improved core for armatures for dynamo and magneto-electric machines
formed of thin soft iron discs hereinbefore called core-rings together with supporting
rings such as are hereinbefore described; the whole being held together by bolts with
or without sheathings of insulating material substantially as hereinbefore described and
shewn in the various figures of the accompanying drawing.
2. The improved core for armatures for dynamo and magneto electric machines
formed of thin soft iron rings hereinbefore called core-rings together with supporting
rings, such as are herein described, held together by bolts passing through the
supporting rings but being only partially encircled by the core-rings, and without
sheathings of insulating material as hereinbefore described.
3. The arrangements for attaching our improved cores to the axles hereinbefore
described and illustrated in the accompanying drawing.
4. The improved armatures for magneto or dynamo-electric generators or motors
hereinbefore described and illustrated in the accompanying drawing.
Noted the Inox of Hohrua 19TH IXX7
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicants.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicants.