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

page_text: Date of Application, 28th May, 1895
Complete Specification Left, 25th Feb., 1896-Accepted, 28th Mar., 1896
PROVISIONAL SPECIFICATION.
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 consists in ommitting the upper half tube or casting, and in
replacing it by a plate of cast or wrought iron, which in large machines
I manufacture in sections, there is in these machines a slight downward magnetic
pull on the armature, which is not injurious, but on the other hand these machines
may be extremely easily inspected and rapidly put together, the aforesaid plate
sections may be screwed on, or located by means of pins, and I entirely enclose the
ends of the machine and I cast the ends extremely thin, so that few lines of force
can pass there through, as there is otherwise some leakage between the armature
ends and the frame or body of the machine, the commutator is thus entirely
enclosed, brushes of the usual type on an adjustable yoke being employed.
Upon the bottom pole piece I screw canopies or franes of brass or other suitable
material, to prevent any approach of the field coils to the armature, the said field
coils may be further retained in place, by means of a slight pressure from the
aforesaid plate sections. The journals may be screwed to the bosses of the lower
half tube, and the whole or any part of the machine or field may be made in cast
or wrought iron or steel where suitable.
The aforesaid plate may be made flat with a pole piece in the centre, the sides of
the lower half tube, being increased in height, or the said plate or plate sections
may be curved or shaped as convenient, the sections or casting towards the ends of
the machine being made thin, and when desired the smallest machines for easy.
removal, may have the aforesaid plate or cover made in sections, which in, all
machines run at right angles to the shaft. Connecting wires pass through holes
in the castings.
Dated this 28th day of May 1895
1
I
COMPLETE SPECIFICATION..
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 and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
1
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.
My invention consists in ommitting the upper half tube or casting and in replacing:
it, by a plate of cast or wrought iron, which in large machines I manufacture in

page_text: sections, there is in these machines a slight downward magnetic pull on the armature,
which is not seriously injurious, but on the other hand the machine may be extremely
easily inspected and rapidly put together, the sections of the aforesaid plate sections
may be screwed on, or located by means of pins, and I entirely enclose the ends of
the machine and I cast the ends extremely thin, so that few lines of force can pass
there through, as there is otherwise some leakage between the armature ends and
frames or body of the machine, the commutator is thus entirely enclosed, brushes of
ordinary type on an adjustable yoke being employed. Upon the bottom pole piece I
screw canopies or frames of brass or other suitable material to prevent any approach
of the field coils to the armature, the said field coils may be further retained in
place, by means of a slight pressure from the aforesaid plate sections. The
journals may be screwed to the bosses of the lower half tube. And the whole or
any part of the machine or field_may be made in cast or wrought iron or steel
where suitable.
The aforesaid plate may be made flat with a pole piece in the centre, the sides
of the lower half tube being increased in height and the said plate or plate sections
may be curved or shaped as convenient, the sections or casting towards the ends
of the machine being made thin. When desired the smallest machines for easy
removal may have the aforesaid plate or cover made in sections, which in all
machines run at right angles to the shaft. Connecting wires pass through holes in
the casting.
In the accompanying drawings Fig. 1, is an end view, Fig. 2 a side view, of a
generator or motor constructed according to this invention, A Fig. 1 and 2 are the
central sections of the plate aforesaid, B, C1 and C2 are thin end sections thereof,
D1 and D2 are the thin ends or end brackets of the machine. A commutator
is shown at E and a brush holder may ride on the boss F of the bush G. The
field coils are indicated at H and the aforesaid canopy at I attached to the pole
piece K by means of screws J.
and may be produced as
be necessary.
Canopies are shewn separately in Figs. 4, 5, 6, and 7 at
far above the diametral and central line M as may
Journals are shewn at G being attached to the bosses of the lower half tube by
screws N, the parts of the plate aforesaid at B, C1 and C2 may for ease in lifting
be made in as many sections as necessary.
Oil holes may be made at O, Fig. 2 these holes square or round may be large
enough to inspect the oil rings and be furnished with lids or covers as shewn
at O. The line X, Y, Fig. 1, forming the side of the pole piece K may be either
perpendicular or approximately thereto, or at right angles to a perpendicular as in
Fig. 3, this design being particularly suitable where the central portion K and P
Fig. 2 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 pattern of the ends and end brackets D and D 2, Fig. 2 will be made as if for
entirely cast iron but sawn off at the points Q 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 by means of lugs S Fig. 1. It is evident that these
machines when furnished with a double winding, and commutator at each end, form
efficient motor dynamos.
To reduce the weight of the canopy as shewn in Fig. 4 and 5 it may be made
perforated of sheet or cast brass or other nonmagnetic material or it may consist
simply of one or more strips attached to the pole piece K as shewn in Fig. 6 and 7,
the canopy may be screwed to the pole piece by means of corner lugs as shewn
at J Fig. 4 and 5. Connecting wires may pass through suitable holes with or
without insulating sleeves in the casting preferably through holes in the end
bracket D2 Fig. 2, internal connections heing made then with the brushes
and field coils. Eye bolt holes may be made in, or handles attached to all
the plate sections. In some cases the thin plate sections B, C1 and C2
may be omitted.
:
The plate sections A Fig. 1, may be made with slight pole piece tips as shown.

page_text: at T Fig. 1 or they may be made without, being lowered more nearly to the
diametral line M as shewn in Fig. 3. The ends D1, D2 and B may be of as
extended an area and as far away from the armature as possible as indicated in
Fig. 1 by the dotted lines U, or those portions near the centre of the machine
only may be so whereas those near the journals may be as shewn, or be more or
less contracted.
The sections A Fig. 1 and 2 may in all machines be made in wrought or cast iron
or steel.
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―
1st. In a dynamoelectric generator or motor of the type described in Specification
No. 6569 of A.D. 1889 replacing the upper half tube by a plate substantially as
herein described and shewn.
2. In a dynamoelectric generator or motor of the type described in Specification
No. 6569, of A.D. 1889 replacing the upper half tube by a plate made in sections
substantially as herein described and shewn.
3. In a dynamoelectric generator or motor of the type described in Specification
No. 6569 of A.D. 1889 replacing the upper half tube by a plate the ends of the
said plate, and said lower half tube being thin as and for the purpose herein
described and shewn.
Dated this 24th day of February 1896.