Year: 1897

page_text: Date of Application (in United Kingdom), 12th July, 1897
Complete Specification Left, 6th Apr., 1898-Accepted, 20th May, 1898
I, GEORGE WESTINGHOUSE, of Westinghouse Building, Pittsburg, County of
Allegheny, and State of Pennsylvania, one of the United States of North America,
Engineer, do hereby declare the nature of this invention to be as follows;
My invention relates to cores for electric machines, and has for its object to
provide a simple, inexpensive and efficient means whereby the laminae of the
cores of electric machines may be secured together and to the casting constituting
the support for such laminae.
Prior to my invention it was the usual practice to clamp the laminae forming
parts of the cores of electrical machines together by means of end plates or rings,
and bolts passing through said parts. Such construction, was open to objection
by reason of the number and weight of the parts employed, as well as on account
of the labour and expense involved in manufacturing and assembling the said
parts.
My invention overcomes these objections and materially improves the appear-
ance of the machine. Furthermore any possibility of accidental displacement
of the parts after they have been once assembled is prevented whilst dismember-
ment of the machine can be readily effected if desired.
According to my invention the casting for supporting the laminae has a cylin
drical surface, and is provided with a flange at one end, and a circumferential
groove at or near its other end. The laminae are slipped over or into the casting,
and when a sufficient number of such laminae have been assembled an annular
plate is placed on the casting, said annular plate being provided with a peripheral
groove, which, when the plate is in a position to tightly clamp the laminae
against the flange abovementioned, is opposite the circumferential groove of the
casting. The several parts are maintained in this position by any suitable means
and molten "Babbitt" or other fusible metal, suitable for the purpose, is then
poured through openings provided in the casting or in the annular plate into
the peripheral grooves in said parts where it solidifies to form a ring. Said ring
being located partly in a groove in the casting, and partly in a groove in the
[Prin 8d 1

page_text: annular plate will of course prevent the two parts from moving relatively to one
another, and thus maintain the laminae in position when the restricting means
are removed.
If it is required for any purpose to dismember the core the ring may be removed
by subjecting the structure to a sufficiently high temperature to melt the metal
of which the ring is composed.
My invention is applicable to structures in which the laminae are located
within the casting as well as to those structures such as revoluble members where
the laminae surround the casting or support.
I desire it to be understood that my invention is not limited to the details
hereinabove described since the parts may be modified in many particulars without
departing from the spirit and scope of the invention, which is intended to cover
broadly a clamping means for the laminae of cores of electrical machines em-
bodying a fastening ring interposed between some portion of an annular clamp-
ing plate at or near one end and a flange or flanges at or near the other end of
the casting which constitutes the main support for the laminae.
Doted this 10th dow of T1 100%
W. P. THOMPSON & Co.,
Patent Agents for the Applicant, 322, High Holborn, London, W.C.
I, GEORGE WESTINGHOUSE, of Westinghouse Building, of Pittsburg, County of
Allegheny, and State of Pennsylvania, one of the United States of North America,
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:-
My invention relates to cores for electrical machines, and has for its object to
provide a simple, inexpensive and efficient means whereby the laminae of the
cores of electrical machines may be secured together and to the casting constituting
the support for such laminac.
Prior to my invention it was the usual practice to clamp the laminae forming
parts of the cores of electrical machines together by means of end plates or rings,
and bolts passing through said parts. Such construction was open to objection
by reason of the number and weight of the parts employed, as well as on account
of the labour and expense involved in manufacturing and assembling the said
parts.
My invention overcomes these objections and materially improves the appear-
ance of the machine. Furthermore any possibility of accidental displacement
of the parts after they have been once assembled is prevented whilst dismember-
ment of the machine can be readily effected if desired.
According to my invention the casting for supporting the laminae has a cylin-
drical surface, and is provided with a flange at one end, and a circumferential
groove at or near its other end. The laminae are slipped over or into the casting,
and when a sufficient number of such laminae have been assembled an annular
plate is placed on the casting, said annular plate being provided with a peripheral
groove, which, when the plate is in position, tightly clamp the laminae against
'

page_text: the flange abovementioned opposite the circumferential groove of the casting.
The several parts are maintained in this position by any suitable means and then
molten "Babbitt" or other fusible metal, suitable for the purpose, is poured
through openings provided in the casting or in the annular plate into the
peripheral grooves in said parts where it solidifies to form a ring, said ring being
located partly in a groove in the casting, and partly in a groove in the annular
plate will of course prevent the two parts from moving relatively to one another,
and thus maintain the laminae in position when the restricting means are removed.
In order that the invention may be clearly understood, I will now proceed to
describe the same with reference to the accompanying drawings in which
Figure 1 is a side elevation partly sectional of the core and casing of the
stationary member of an induction motor constructed in accordance with the
present invention.
Figure 2 is a similar view illustrating the longitudinal section of the invention
applied to the rotatable member of a generator or motor.
Figures 3 and 4 are detail sectional views shewing the parts more clearly.
Similar parts are denoted by the same reference numerals in all the views.
Referring now to Figure 1, 1 is a casting having a cylindrical internal periphery
and provided with a projecting flange 2 at one end; at the other end of the cast-
ing a groove 3 is provided forming a shoulder 4. The laminae 8 which are pro-
vided with transverse slots or grooves for the reception of coils in the usual
manner are placed in position within the casting against the flange 2, and an
annular plate 5 is placed at the other end of said laminae. This annular plate
is provided with an external groove 6 corresponding to the groove and openings 7
communicating with the annular space formed by the two grooves. To весите
the laminae in position the annular plate 5 is pressed down compressing the
laminae until the groove 6 is opposite the groove 3. Molten "Babbitt" metal or
other fusible metal suitable for the purpose is then poured through the openings 7
into the annular space formed by the grooves 3 and 6 where it solidifies to form
a ring 10. The pressure on the annular plate 5 may then be removed, the metal
ring 10 holding the parts in position. The arrangement of parts adjacent to
ring 10 is clearly shewn in section in Figure 3.
In Figure 2 a construction suitable for an armature is shewn in which the
laminae 8 surround the casting 1. The flange 2 is now external instead of
internal and the annular plate 5 also is placed outside the casting. The method
of securing the annular plate 5 in place is the same as hereinabove described with
reference to Figures 1 and 3, and an enlarged view of the parts adjacent to the
securing ring 10 is shewn in Figure 4.
If it is desired for any purpose to remove the laminae in either of the above
described constructions the ring 10 is melted by subjecting the structure to a
sufficiently high temperature, and the annular plate 5 can then be removed.
The invention is not limited to the specific details shewn and described as
further modifications may be made without departing from the spirit and scope
of the invention, for example, in place of a single circumferential flange 2 being
employed a plurality of projecting lugs may be used. Further, the shoulder 4,
formed by the groove 3 in the casting 1, may be replaced by a plurality of
shoulders, and this is also the case with the shoulder formed in the annular plate 5
by the groove 6 in Figures 1 and 2. The designs shewn are, however, found
very suitable in practice.
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. For an electrical machine a core composed of laminae maintained in position
on or in a supporting casting by means of an annular plate which presses the
laminae against a flange or lugs at one end of the casting, said annular plate being
secured by means of a ring located partially in a circumferential groove provided

page_text: in the casting and partially in a corresponding circumferential groove in the
annular plate.
2. For electrical machines, laminated cores constructed substantially as described
with reference to the accompanying drawing.
Datad L 1
די
1000
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester, and Birmingham,
Patent Agents for the Applicant,
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester, and Birmingham,
Patent Agents for the Applicant,