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.
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 by a more suitable disposition of the materials
entering into the construction of dynamo-electric generators and motors, than
heretofor employed to produce a dynamo-electric generator or motor of extreme
lightness and high efficiency.
A dynamo-electric generator. or motor constructed according to my invention
consists of a tube of cast or wrought iron, in or against the interior of said tube
being four or more shallow pole pieces, attached to or integral with said tube, said
pole pieces being equidistant from one another and diametrically opposite one
another, and centrally within the tube and pole pieces, I situate an armature, said
armature being supported by end brackets or frames secured to the ends of the
tube, which said ends, said end brackets or frames may partially or entirely enclose.
And around each pole piece I place exciting coils, such coils being wound and
taped and bent or compressed in a mould or otherwise to the exact curvature of
the interior of the tube, and I make such coils in two or more sections, one or
more sections being larger than the other section or sections in the same coil, and
between the exciting coils and armature I interpose curved plates of brass or other
suitable material, which may rest on ledges on the pole pieces, when the pole pieces
are detachable, or be held in place by end cylinders, and I make the exciting coils
large enough to fill as nearly as possible except where the pole pieces are situate
the annular space between the armature and tube.
תושב
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COMPLETE SPECIFICATION.
Improvements in Dynamo-electric Generators and Motors.
I, GEORGE EDENSOR 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 by a more suitable disposition of the materials
entering into the construction of dynamo-electric generators and motors than
heretofor employed to produce a dynamo-electric generator or motor of extreme
lightness and high efficiency.
A dynamo-electric generator or motor constructed according to my invention
consists of a tube of cast or wrought iron in or against the interior of the said tube
being four or more shallow pole pieces, attached to or integral with the said tube, the
said pole pieces being equidistant from one another and diametrically opposite one
another. And centrally within the tube and pole pieces I situate an armature, the said
armature being supported by end brackets or frames secured to the ends of the tube,
or by brackets carried up from a bed plate to which the tube may be attached.
And around each pole piece I place exciting or field coils, the said coils being
wound and taped and bent or compressed in a mould or otherwise, to fit the curvature
of the interior of the tube, and I make such coils in two or more sections, one or
more sections being larger than the other section or sections in the same coil, or the
sections may be all of the same size, and between the exciting or field coils and
D

page_text: armature, I interpose curved plates of brass or other suitable material, which serve to
prevent the too near approach of the said coils to the armature.
In the accompanying drawings, figure 1 is a sectional view through the pole pieces
of a dynamo-electric generator or motor made according to this invention. Figure 2
is an exterior view shewing end brackets bolted to the ends of the tube. Figure 3 is
an end view and plan of the curved brass plates I interpose between the field coils and
armature. Figure 4 is an end view and plan, of a section of the field coils. Figure 5
is a partial end view of the machine shewing the field or exciting coils and curved
brass plates in position.
In the figures A indicates the field or exciting coils, the various sections of the said
coils, may each be made of as great a width and length as possible as shewn, or where
a short tube is desired, each section may be of the same width and length as the
section nearest the armature on the respective pole pieces, the tube f being made the
full length of the field or exciting coils as shewn, or when the least weight is required
being made the length only of the polo pieces, the brackets K and M being then
made with long arms to reach over the ends of the coils.
The aforementioned curved brass plates are indicated at 6 the plates being put in
place after the various sections of the field coils have been slipped on the pole pieces P,
the outside sections or those sections nearest the tube f being placed on their
respective pole pieces first, then the next set of sections, and so on, except when the
sections are all of the same width and length, when it is possible to slip the whole set
of sections on each pole piece at once, the curved brass plates may be arranged in
place by pushing in endways between the coils and the extremities O of the pole
pieces, the coils pressing and retaining the plates in place against the said extremities.
The different sections of the exciting or field coils, one of which is shewn in figure 4
are preferably made for ease in bending about one half an inch or less in thickness
the coils wound, being then varnished, taped or sheathed in suitable insulating
material and pressed in wooden dies or otherwise to the necessary curvature.
The armature may be of the usual drum or ring types, as used with multipolar field
magnets.
The weight of the machine for a given output will be reduced, as the number of
pole pieces P is increased, the number of the said pole pieces being always a multiple
of two, to secure alternately north and south poles, as is well understood.
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 an iron tube or equivalent structure
containing, four or more interior pole pieces and field or exciting coils arranged
around the said pole pieces, the said coils being bent to conform with or fit the
interior curvature of the said tube, substantially as herein described and shewn.
2nd. In a dynamo-electric generator or motor an iron tube or equivalent structure
containing four or more interior pole pieces and field or exciting coils arranged
around the said pole pieces, the said coils being bent substantially as herein described
and shown.
3rd. In a dynamo-electric generator or motor an iron tube or equivalent structure
containing four or more interior pole pieces and sectional field or exciting coils
arranged around the said pole pieces, the said coils being bent substantially as herein
described and shewn.
4th. In a dynamo-electric generator or motor an iron tube or equivalent structure
containing four or more interior pole pieces, bent field coils, arranged around the said
pole pieces, and curved plates of brass or other suitable material interposed between
the said coils and the armature, substantially as and for the purpose herein described
and shown.
Dated this 11th day of January 1890