Improvements in the Construction of Dynamo Electric Machinery.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Construction of Dynamo Electric Machinery.
I, ALFRED SOAMES, of 16, Red Lion Street, Clerkenwell, in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:
This invention relates especially to the construction of electro motors in which a
pile of annular stampings is required to be accurately centred in a frame which also
carries the axis of a rotor to revolve within the annular stampings with a narrow
clearance or air gap.
The frame of the machine consists of a ring casting with a suitable foot or base
and detachable arms carrying the bearings for the axis. This ring casting has also
an inwardly projecting flange. The annular stampings are placed within the ring
resting against the flange and they are threaded upon a dummy rotor which fits
the rings. The stampings being all in place and the spindle of the dummy being
held in the bearings accurately in position a covering ring is placed against them
and is forced into the ring frame and thereby the stampings are firmly clamped.
Then type metal or such like fusible metal is run into grooves provided for the
purpose in the several parts and so the stampings are secured within the frame.
Or the covering ring whilst clamping the stampings may be otherwise secured in
its place.
This method of centreing a ring of stampings in a frame is applicable to all
dynamo electric machinery where such a structure is required.
DAL
101 1
1007
Improvements in the Construction of Dynamo Electric Machinery.
I, ALFRED SOAMES, of 16, Red Lion Street, Clerkenwell, in the City of London,
Engineer, 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 especially to the construction of electro motors in which a
pile of annular stampings is required to be accurately centred in a frame which also
carries the axis of a rotor to revolve within the annular stampings with a narrow
clearance or air gap.
According to this invention I form the frame of the machine of a cylindrical
casting having a suitable foot or base and detachable arms secured to
its ends for carrying the bearings for the armature axis. The cylindrical
casting has also an inwardly projecting flange near one end of it.

page_text: The annular stampings I mount side by side on a mandril and clamp them
all firmly together. The mandril is provided with an axis which corresponds with
the axis of the armature or revolving portion of the dynamo electric machine to be
constructed. The axis with the mandril and stampings carried by it is placed into
the bearings on the frame of the dynamo electric machine. The axis is then drawn
endwise within the bearings until one side of the assemblage of stampings bears
against the inner side of the flange-and a ring is held against the opposite side
of the assemblage of stampings. Type metal or other suitable material is then
run into the space between the outer circumference of the stampings and of the
ring and the inner circumference of the cylindrical frame. In this
way all parts are
securely held together with the inner circumference of the annular stampings con-
centric with the armature bearings. The ring and frame being so formed that the
ring is held to the frame by the casting.
Figure of the drawings hereunto annexed shows an end view one half in
section of a machine so constructed. Figure 2 is a longitudinal section of the same
with the bearings removed. Figure 3 is a part longitudinal section on a larger
scale. Figure 4 is a longitudinal section showing the way in which the stampings
are held in place within the frame of the machine and concentric with the bearings
at the time when type metal or other material is run into the space between them
and the frame. Figure 5 shows a modified form of ring used for holding the
assemblage of stampings.
In these figures A is the cylindrical frame of the machine. A' its inner flange.
A the bearings for the armature axis. B are the rings or stampings. The aper-
tures formed through these rings for receiving the field windings are not shown.
In Figure 4 the rings are shown mounted on a mandril C the axis of which fits
into the bearings A2. The mandril has a fixed flange at one end and a loose
flange at the other which can be moved towards the fixed flange by a nut 1 screwing
onto a screw thread on the mandril axis. The rings are placed on to the mandril
between the flanges and are then clamped between them by screwing up the nut D.
The axis of the mandril is then placed into the bearings A3 and is drawn endwise
therein by a nut which screws on to a screw thread on one of its ends and abuts
against the end of one of the bearings. In this way one side of the assemblage of
rings is held against the inner side of the flange A¹. A ring F is also placed against
the other side of the assemblage of rings and is held firmly against it by clamping
pieces G carried by the end of the mandril. The ring has a groove formed around
its outer circumference as shown at Figure 4-a corresponding groove is also formed
around the inner circumference of the cylindrical frame other grooves A³ at
distances apart from one another are also formed in the frame parallel to the axis.
When the mandril with the parts carried by it is thus held in place within the
frame the frame is placed on end with the ring F uppermost and type metal or other
suitable material is cast into the space between the frame and the stampings and
ring and into the several grooves above mentioned. When the metal or material
has set, the mandril is removed leaving the stampings accurately centred within
the frame and securely held in place.
Instead of grooves being cut around the ring F and frame for the type metal
to be run into as above described the outer circumference of the ring might be
bevilled as shown at Figure 5 and the portion of the inner circumference of the
frame opposite the ring be correspondingly bevilled.
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:
1. A dynamo electric machine in which an assemblage of sheet metal rings is
secured to the frame concentrically with the bearings for the armature shaft by
type metal or other suitable material cast between them and the frame.
2. A dynamo electric machine in which an assemblage of rings or stampings used

page_text: for carrying the field indings is held in place within a cylindrical frame con-
centric with the bearings for the armature axis, by type metal or other suitable
material cast into the space between their outer circumference and the frame and
by one side of the assemblage of stampings being held up to a flange formed around
the interior of the frame by a ring which is held against the opposite side of the
assemblage of stampings by the type metal or other casting.
3. The herein before described method of securing an assemblage of annular
stampings or rings side by side within the frame of a dynamo electric machine
concentric with the armature bearings such method consisting in making the frame
of cylindrical form with the armature bearings carried from its ends and with a
flange extending inwardly near one end-mounting the stampings side by side
upon a mandril whose axis corresponds with the armature axis-placing the axis
of the mandril into the bearings and drawing it endwise until one side of the assem-
blage of stampings bears against the flange-holding a ring against the opposite
side of the assemblage of stampings-placing the frame on end with this ring upper-
most and pouring type metal or other suitable material into the space between the
frame and the outer circumference of the stampings and ring substantially as
described.