IMPROVEMENTS IN DYNAMO-ELECTRIC MACHINES
Year: 1880

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for an Invention of
"IMPROVEMENTS IN DYNAMO-ELECTRIC MACHINES." A communication from
abroad by Charles Albert Hussey and Amzi Smith Dodd, both of the City
and State of New York, United States of America.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 19th October 1880.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN DYNAMO-ELECTRIC MACHINES,"
[A communication from abroad by Charles Albert Hussey and Amzi Smith Dodd,
both of the City and State of New York, United States of America.]
These improvements comprise a novel form of magnet and its appurtenances,
whereby increased effectiveness is afforded; also a novel form of armature tending
to the same result; also the combination of said magnet and armature, whereby
the armature is made to rotate before the poles or consequent points of the magnet,
before the whole length of the magnet and the wires surrounding the same, and
through the entire field of force, and thereby to produce improved results.
In carrying the said Invention into practice I provide a magnet, which consists
of a circular bar of cast iron or other suitable metal round in transverse section, or
of a cylinder of similar material. There are transverse projections from the magnet,
which project inwardly and radially therefrom, also arc-shaped extensions from the
inner ends of the said projections concentric with the magnet. The magnet may be
made in two semi-circular sections, and the projections and the arc-shaped extensions
may be correspondingly divided to facilitate the manufacture of the same. When
so made the two sections of the magnet may be wound in any suitable manner, and
the like poles of the sections arranged in contact with or in proximity to each other,
and then the projections and arc-shaped extensions will forn the poles of the
magnets. But when the magnet is made in one piece the wire on its portions at
each side of the projections will be wound in reverse directions, and then the said
projections and their arc-shaped extensions will form consequent points. The wire
[Pavice Gr

page_text: will be wound on the magnet to an extent sufficient to make it on the inner side of
the magnet form a continuation of the circle of which the extensions are arcs, so
that the armature before the pole or consequent points will rotate before the whole
length of the magnet and wire wound thereon, and hence through the whole field of
force all at the same time, whereby the effectiveness of the machine is greatly
increased. One section of the magnet may be omitted and the armature still have
the advantage due to its rotation through the whole field of force of the other
section. The magnet is supported by standards erected on a base piece and having
outwardly extending portions of the projections secured to them by screws or
otherwise.
I provide an armature comprising radial projections and intervening spaces, in
which the wire wound between the said projections is contained. This armature is
of a skeleton like construction, consisting of a series of arcs of a circle, another
series of arcs of a larger but concentric circle arranged opposite the spaces between
the arcs first named and a number of approximately radial portions connecting the 1
two series of arcs. It has an opening from end to end through the centre and
likewise has openings from end to end through the radial projections. Preferably
the opening through the centre and the openings through the radial projections are
in communication with each other. It may be formed of a single plate of metal
bent into shape or of two longitudinal sections of metal suitably bent into shape
and welded together at the periphery of the said projections or otherwise. If
desirable it may be made of a cylinder with projections provided with longitudinal
openings attached to it. It may also be made of plates stamped out of thin metal
and secured together in close contact by bolts passing through them. In either
case it will have the openings or apertures through its centre and through its radial
projections for the circulation of air, whereby it will be kept cool. This armature
may be provided with journals in any suitable manner. The armature may be
wound longitudinally in various ways. Wire may, for instance, be wound around
its radial projections or over two opposite spaces between the radial projections,
or over one of the spaces between the radial projections and through the
interior.
The commutator may be of the usual or any suitable form, and is mounted on
one of the journals of the armature, the wires from the commutator being led to it
through holes or recesses in the said journal. The ends of the various wires wound
on the armature are looped and connected by single wire to the commutator.
Commutator-brushes bear against it in a well known manner.
The wires for carrying off electric currents generated in the machine are connected
to binding screws.
By this Invention is produced a very simple, compact, and effective machine,
owing largely to the rotation of the armature before the poles of the magnet, before
the whole length of the magnet and the wire surrounding it all at the same time,
and thus throughout the entire field of force. If desirable the projections may
extend or be exposed outwardly in lieu of inwardly, or they may extend
transversely from the side of the magnet, and in that case the armature will need
to be somewhat modified or changed also as to its position.

page_text: by standards D erected on a base-piece E, and having outwardly extending portions
of the projections B secured to them by screws a, or otherwise.
F represents an armature comprising radial projections b and intervening spaces c,
in which the wire wound between the said projections is contained. As shewn, the
said armature is of a skeleton-like construction, consisting of a series of arcs of a
circle, another series of arcs of a larger but concentric circle arranged opposite the
spaces between the arcs first named, and a number of approximately radial portions
connecting the two series of arcs. It has an opening from end to end through the
centre, and likewise has openings from end to end through the radial projections.
These openings through the centre and through the radial projections are preferably
in communication with each other, as shewn. The said armature may be formed
of a single plate of metal bent into shape, or of two longitudinal sections of metal
suitably bent into shape and welded together as at d, or at the periphery of the
said projections. If desirable it may be made of a cylinder with projections
provided with longitudinal openings attached to it. It may also be made of plates
stamped out of thin metal and secured together in close contact by bolts passing
through them. In either case it. will have the openings or apertures through its
centre and through its radial projections for the circulation of air, whereby it will
be kept cool. This armature may be provided with journals in any suitable
manner. It is shown as provided with journals e, which are attached to skeleton
frames or end plates f by screws or otherwise. These journals are supported in
bearings, shewn as arranged in cross bars G, extending from one to the other of the
standards D. The armature may be wound longitudinally in various ways. Wire
may, for instance, be wound around its radial projections, as indicated by the
arrow g, Figure 3; or over two opposite spaces between the radial projections, as
indicated by the arrow h, Figure 3; or over one of the spaces between the radial
projections and through the interior, as indicated by the arrow i, Figure 3.
H designates the commutator, which may be of the usual or any suitable form,
and is mounted on one of the journals of the armature, the wires from the
commutator being led to it through holes or recesses in the said journal. The ends
of the various wires wound on the armature are looped and connected by single
wire to the commutator, as shewn in Figure 5. Commutator-brushes I bear against
the said commutator in a well known manner.
The wires J for carrying off electric currents generated in the machine are
connected to binding screws K.
By this Invention is produced a very simple, compact, and effective machine,
owing largely to the rotation of the armature before the poles of the magnet, beforė
the whole length of the magnet and the wire surrounding it, all at the same time,
and thus throughout the entire field of force. If desirable the projections B may
extend or be exposed outwardly in lieu of inwardly, or they may extend transversely
from the side of the magnet A, and in that case the armature will need to be
somewhat modified or changed also as to its position.
Having thus fully described the said Invention as communicated to me by my
foreign correspondents, and the manner of performing the same, I wish it understood
that I claim,-
First. A magnet for a dynamo-electric machine, circular or semi-circular,
cylindrical or semi-cylindrical in form, having portions extending or exposed
inwardly, outwardly, or transversely at the sides, the magnet being wound with
wire between the said portions, substantially as above set forth and for the purpose
specified.
Second. A magnet for a dynamo-electric machine, circular or semi-circular,
cylindrical or semi-cylindrical in form, having projections extending inwardly,
outwardly, or transversely from the sides, and terminating in arc-shaped extensions
concentric with the magnet, the latter being wound with wire between the
projections only, and preferably to such an extent that the inner surface of the wire
will form a continuation of the arc-shaped extensions, substantially as above set
forth and for the purpose specified.

page_text: Third. An armature for a dynamo-electric machine, comprising radial projections
and intervening spaces, having an opening through the centre and openings through
the said radial projections, substantially as above set forth.
Fourth. In a dynamo-electric machine, the combination of a magnet of circular,
semi-circular, cylindrical or semi-cylindrical form, wound as described, and provided
with projections extending inwardly, outwardly, or transversely from the sides, and
terminating in arc-shaped extensions, and an armature provided with radial
projections and intervening spaces, and having an opening through the centre and
openings through the radial projections, substantially as above set forth and for the
purpose specified.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Eighteenth day of April, in the year of our Lord One
thousand eight hundred and eighty one.
WP, ROB. LAKE. (L.S.)
W”,