Improvements in Dynamo-electric Generators and motors.
Year: 1895

page_text: Date of Application, 27th May, 1895
Complete Specification Left, 25th Feb., 1896-Accepted, 28th Mar., 1896
Improvements in Dynamo-electric Generators and motors.
I GEORGE EDENSOR DORMAN of The Hawthorns, Newport Road, Stafford, in
the County of Stafford, Inventor, do hereby declare the nature of this invention
to be as follows:-
My invention relates to dynamo electric generators and motors, and particularly
to that type, for which Letters Patent No. 6569,-A.D. 1889 were granted to me.
My invention provides means whereby all parts of the interior of the said machines
may be readily got at, although the said machines be made in large sizes, and
whereby the efficiency is increased and the parts easily removed or interchanged.
My invention consists in constructing the upper half of the said machines in
sections running at right angles to the shaft, such sections being hinged or fastened
by screws to the lower half, or by pins, so that each casting or section be easily
removed by hand, and in making the end brackets as thin as the strength of the
iron will allow, (the machines being entirely enclosed) so that few lines of force
pass the ends, there having been heretofor some leakage between the ends of the
armature and frame or body of the machine, and in attaching the upper end
brackets by screws or pius so that they can be easily removed, both at the com-
mutator and pulley end, the brushes and holders being thus completely enclosed
and being of the ordinary type on an adjusting yoke.
In putting the machine together, the lower field coils are situated around their
pole piece, the armature is placed in its journals, I then place the upper fields
around the armature and in order to prevent the too close approach of the said
fields to the armature I attach or screw to the bottom pole piece, canopies or
frames of brass or other suitable nonmagnetic material, before situating the
armature between the upper and lower coils a suitable insulating material or
packing having been placed, the sections forming the upper half tube may now be
screwed on, or turned back into place, followed by castings forming the pulley and
commutator end covers. The journal bushes may be screwed to the bosses of the
lower half tube. The whole machine or any part may be made in cast or wrought
iron or steel where suitable.
Connecting wires may pass through insulated holes in the castings preferably
in the lower casting.
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CM 1005
Improvements in Dynamo-electric Generators and Motors.
I, GEORGE EDENSOR DORMAN of The Hawthorns, Newport Road, Stafford in
the County of Stafford 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 dynamoelectric generators and motors and particularly
to that type for which Letters Patent No. 6569, of A.D. 1889, were granted to me.

page_text: My invention provides means whereby all parts of the interior of the said machines
may be readily got at, although the said machines be made in large sizes and
whereby the efficiency is increased and the parts easily removed or interchanged.
My invention consists in constructing the upper half of the said machines in
sections running at right angles to the shaft, such sections being hinged or fastened
by screws to the lower half, or by pins, so that each casting may be easily removed
by hand, and in making the end brackets as thin as the strength of the iron will
allow, (the machines being entirely enclosed), so that few lines of force pass the
ends, there having been heretofor some leakage between the ends of the armature
and frame, and in attaching the upper end brackets by screws or pins so that these
brackets be easily removed, both at commutator and pulley end, the brushes and
holders being thus completely enclosed, and being of the ordinary type on an
adjustable yoke. In putting the machine together, the lower field coils are
situated around their pole piece, the armature is placed in its journals, I then
place the upper fields around the armature and in order to prevent the too close
approach of the said fields to the armature I attach or screw to the bottom
pole piece canopies or frames of brass or other suitable nonmagnetic material
before situating the armature. Between the upper and lower coils a suitable
insulating material or packing having been placed, the sections forming the
upper half tube may now be screwed on, or turned back into place, followed by
castings forming the pulley and commutator end covers.
The journal bushes which should be of the self oiling type I screw to the bosses
of the lower half tube.
The whole machine or any part may be made in cast or wrought iron where
suitable.
In the accompanying drawings Fig. 1 is an end view and Fig. 2 a side view of a
generator or motor thus constructed. A are sections of the central part of the
upper half tube, the end brackets as aforesaid being thin few lines of force passing
there through, the main portion of the field is in these sections the remaining
portion of the machine being constructed lightly. B1, B2, C, D1 and D2 are
sectional parts of the ends, and end brackets of the upper half tube, forming also
removable covers therefor, these castings may be made for ease in lifting, in as
many sections as necessary. O and O1 are the thin ends and end brackets of the
lower half tube.
A brush holder of ordinary type may ride on the boss E of the bush G, the
commutator being shewn at F.
In Fig. 1, H are the lower field coils, and I is the canopy attached to the lower
pole piece K by screws J the upper field coils being shewn at L.
Canopies are shewn separately in Figs. 3, 4, 5, and 9 at I the said canopy may
be produced as far above the central and diametral line M as necessary following
as far as possible the contour of the upper field coils, preventing their approach
to the armature without approximating itself thereto.
Insulation between the upper and lower field coils is shewn at N, Fig. 1, this
may be taped on to the lower field coils and all space may be taken up, or the
upper and lower coils may be sufficiently insulated in themselves as not to require
further insulation. The journal bushes G and P Fig. 2 are screwed to the bosses
of the lower half tube Q1 and Q2 by screws R. Connecting wires may pass
through suitable holes with or without insulating bushes in the castings, preferably
through holes in the lower end bracket 1, internal connections being made then
with the brushes and field coils.
Suitable handles may be cast on the upper half tube sections as at S Fig. 2 or
elsewhere at the sides when convenient and may be also furnished to sections A, or
eye bolt holes may be made in all sections. Fig. 6, 7, and 8 represent sections of
the thicker and central sections of the upper half tube a counterpart of these
sections being in the lower half tube as is well understood.
To economise metal, a depression T is made externally in the centre of the pole
pieces larger or smaller according to the design of these machines, and in order that

page_text: such depression should not leave an air space at the end brackets at T Fig. 1, on
those sections or parts neighbouring the end brackets I cast or attach or leave
metal to cover such air space, such metal being shewn at U, Fig. 2 and in Figs. 6, 7,
and 8, the full lines representing the sections at the centre of upper and lower pole
pieces of various designs the dotted lines the aforesaid metal, cast, or attached as
in Fig. 8 to cover any space as aforesaid.
A reduction or neck O1 and C is shewn in Figs. 1 and 2, this is not necessary
except to reduce space, and sometimes this may be of the same diameter as
and B 2, the diameter of this portion as at O and B1 may be as large and as
far away from the armature as possible or medially situated as shewn or may be
made to embrace the field coils as nearly as possible.
In small sizes when the top casting may be easily removed, the greater portion
may be solid or only the ends separate or a portion of said ends especially at the
cominutator end, in some cases the upper ends or covers may be partially or
entirely omitted. Oil holes may be made at W, Fig. 2 these holes square or round
may be large enough to inspect the oil rings and be furnished with lids or covers
as at W. The line X, Y, Figs. 1, 6, 7 and 8, forming the side of the pole piece
may be either perpendicular or approximately thereto, or at right angles to a
perpendicular as in Fig. 8, this design is particularly suitable where the central or
main field portion is made in wrought iron. When the centre of the bottom half
is thus made of wrought iron of blocks bolted together or of groups of wrought
iron stampings, the patterns of the lower ends O Fig. 2 will be made as if
for entirely cast iron, but sawn off at the points Z, thus leaving a thin section of
cast iron which ultimately forms part of the pole piece, the wrought iron centre
being bolted up between the two ends of the bottom half tube by means of
lugs Z2 Fig. 1, lugs for attachment may also be bolted to wrought iron portions
as shewn in Fig. 8 at X 2, the central section or sections of top and bottom half,
may also be made in cast steel. It is evident that these machines when furnished
with a double winding and a commutator at each end form efficient motor
dynamos.
To reduce its weight the canopy shewn in Fig. 3 and Fig. 9 may be perforated
and may be made of. sheet or cast brass or other nonmagnetic material or may
consist simply of one or more strips attached to the pole pieces as shewn in Fig. 4
and 5, the canopy may be attached or screwed to the pole piece by corner lugs as
sbewn in Fig. 3 and 9.
The improvements described herein are also applicable to generators and motors
as described in my Specification No. 6572 of A.D. 1889. Such machines being
advantageously constructed with the upper casting in sections and with thin
enclosing ends.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1st. In a dynamo electric generator or motor two castings or box like structures
bolted together containing two interior pole pieces, field or exciting coils around
the said pole pieces, having end brackets cast integral therewith, one or both ends
of the said castings or structures being completely enclosed by the said brackets
the said brackets being made as thin as possible, one of the said castings or
structures being made in sections as and for the purpose substantially as herein
described and shewn.
2. In a dynamo-electric generator or motor an iron tube or equivalent structure
cast in halves, the said tube containing two interior pole pieces, bent field or
exciting coils, around the said pole pieces, having end brackets cast integral
with each half tube, one or both ends of the said tube being completely enclosed
by the said brackets, the said brackets, being made as thin as possible one of the
half tubes being made in sections as and for the purpose substantially as herein
described and shewn.

page_text: 3. In a dynamo-electric generator or motor substantially as herein described and
shewn, a canopy or equivalent means for the purpose, substantially as herein
described and shewn.
Dated this 24th day of February 1896.
GEORGE EDENSOR DORMAN.