Improvements in Dynamo-electric Generators and Motors.
Year: 1889

page_text: Date of Application, 17th Apr., 1889
་
Complete Specification Left, 13th Jan., 1890-Accepted, 15th Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Dynamo-electric Generators and Motors.
1, GEORGE EDENSOR DORMAN of The Hawthorns, Stafford in the County of Stafford,
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to provide a simple and effective dynamoelectric
generator or motor, which shall require a minimum of labour in its construction.
A dynamoelectric generator or motor constructed according to my invention
consists of two castings of iron bolted together and forming a rectangular or box like
structure, each casting being one half of said structure and being of trough section,
and interiorly and against and integral with the bottom of each casting and centrally
located situate a pole piece and on the ends of each casting and integral there-
with I form ends or brackets which contain a half boss, said ends or brackets when the
castings are bolted together partially or entirely enclosing the ends of said rectangular
structure aforesaid, when the castings are thus bolted together I bore out the pole
pieces and bosses, at the same time, or at the same setting, so as to support centrally
between the pole pieces an armature, which I support in journals or bushes fixed in
said bosses. After the castings have been bored out and taken apart I place around
the pole pieces exciting coils previously wound and taped, and against each coil I place
a retaining plate of brass or other suitable material. And exteriorly on the castings
I form flanges or lugs by which said castings may be bolted together, and other lugs
or pieces by means of which to bolt the machine to a base or to foundation rails.
Dated this 16th day of Anril 1880
GEORGE EDENSOR DORMAN.
COMPLETE SPECIFICATION.
Improvements in Dynamo-electric Generators and Motors.
I, GEORGE EDENSON DORMAN, of The Hawthorns, Stafford in the County of Stafford,
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 :-
The object of my invention is to provide a simple and effective dynamoelectric
generator or motor, which shall require a minimum of labour in its construction.
A dynamoelectric generator or motor constructed according to my invention
consists of two castings of iron bolted together, each casting being of trough section
and interiorly and against, and integra! with the bottom of each casting and centrally -
located I situate a pole piece, and on the ends of each casting and integral therewith,
I form ends or brackets which contain a half boss, the said ends or brackets when the
castings are bolted together partially or entirely enclosing the ends of the said
castings. When the castings are thus bolted together, I bore out the pole pieces, and
bosses at the same time or with the same cutter, so as to support centrally between
the pole pieces, an armature which I support in journals or bushes fixed in said
bosses.
After the castings have been bored out and taken apart I place around the pole
pieces, exciting coils previously wound and taped, and against each coil, I place a
retaining plate or ring of brass or other suitable material, and exteriorly on the
castings I form flanges or lugs, by which the said castings may be bolted together,
and other lugs or feet by which to bolt the machine to a base or foundation rails.
In the accompanying drawings Figure 1, is a sectional view through the pole pieces
of a dynamoelectric generator or motor made according to this invention.
Figure 2 is an exterior side view.

page_text: Figure 3 is a plan of one of the castings, shewing an exciting or field coil in place
around its pole piece.
In the figures a indicates the exciting or field coils, retaining plates or rings of
brass or other suitable material being shewn at b, and being maintained in position
by brass rods c, recessed into, or attached to, the plates or rings b. In some cases the
coils a may be of sufficiently large diameter and depth as to partially envelope the
armature, the bottom of the coils or the position of the retaining rings being then
indicated by dotted lines e.
A commutator is shewn at d. When the brackets K and M both enclose the
ends of the half tubes as at M, so that brushes of the normal type could not be
approached, brushes may be used which are fed through rectangular tubes to the
commutator, such tubes passing through suitable holes or slots in the castings f, but
when as is shewn in figure 2, the bracket K is sufficiently open, rocking yoke and
brushes of ordinary type may be employed.
As the brackets K and M form part of the magnetic circuit of the machine, in
order to give the lines of force the least resistance, they are preferably made to
completely enclose the ends of the castings f, as shewn at M, this being additionally
advantageous in excluding dust or damp from the field coils and armature.
When the brackets K are made open as shewn, they need not clip the bush N
completely round, but a portion of the surface of the bush as shewn. The flanges v
for bolting the castings together should be made wide, and for the full length of the
casting as shewn in figure 3 in order to give a large surface at the joint H.
When economy in space and weight is desirable the corners r may be rounded to
follow the contour of the field coil. The castings may be made in pure iron or any
of its alloys with carbon or aluminium where desirable or possible.
The pole piece P may be rectangular, but I prefer a circular form, this being the
shape of the opening in the field coils, the coils for ease in winding being preferably
wound on a circular bobbin or former.
The bushes N in the bosses S, which are of the same diameter as the bore of the
pole pieces, may be made in wrought or cast iron. Oil holes may be bored through
the castings, and bushes N, at x, and turned pipes may pass down therethrough, and
rest on smaller bushes o, of suitable bearing.metal, fitted in the bushes N, the bushes o
having small oil holes, so that the said pipes may not fall through on to the shaft, the
lubricant being fed through the said pipes.
When the machine is required to carry heavy currents an air propeller may be fixed
within the machine on the shaft at the pulley end, where there will be space therefor,
in order to draw air through the machine, through suitable perforations in the end
bracket M, delivering the same at, or through similar perforations in the bracket K.
The armature as indicated in the accompanying drawings, is of the usual drum or
ring type.
Feet or lugs or flanges may be cast on the lower of the two castings f, to bolt the
machine to a foundation, or timbers may be bolted directly on to the bottom of
the casting.
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, two castings bolted together,
containing two interior pole pieces and field or exciting coils arranged around the
said pole pieces, substantially as herein described and shewn.
2nd. In a dynamoelectric generator or motor two castings bolted together containing
two interior pole pieces, and field or exciting coils arranged around. the said. pole
pieces and having end brackets cast integral with each casting substantially as herein
described and shewn.
3rd. In a dynamoelectric generator or motor, two castings bolted together
containing two interior pole pieces and field or exciting coils, arranged around the
said pole pieces and having end brackets, cast integral with each casting the said

page_text: brackets being bored out, at the same time as the said pole pieces, substantially as
herein described and shewn.
4th. In a dynamoelectric generator or motor two castings bolted together
containing two interior pole pieces and field or exciting coils arranged around the said
pole pieces, and having end brackets cast integral with each casting, one or both ends
of the said castings being completely enclosed by the said brackets, substantially as
herein described and shewn.
Dated this 11th dox of January 1890