IMPROVEMENTS IN DYNAMO AND MAGNETO ELECTRIC MACHINES "
Year: 1883

page_text: LETTERS PATENT to Charles Wilson Vincent of Holloway in the County of
Middlesex for an Invention of "IMPROVEMENTS IN DYNAMO AND MAGNETO
ELECTRIC MACHINES
"
PROVISIONAL SPECIFICATION left by the said Charles Wilson Vincent
at the Office of the Commissioners of Patents on the 12th March 1883.
CHARLES VINCENT [sic] VINCENT of Holloway in the County of Middlesex
"IMPROVEMENTS IN DYNAMO AND MAGNETO. ELECTRIC MACHINES."
This invention relates firstly to means for obtaining the rapid magnetization
and demagnetization of the iron cores of armatures in dynamo and magneto electric
machines; and secondly to means for obtaining magnetic fields of great strength
with a diminution in the weight of the wire employed.
In order to obtain the first named result, I use, in place of a solid core for the
armature, a packing of iron or steel filings, or it may be scrap iron or borings, making
the same compact in the armature drum or other foundation by the application of
pressure.
This disintegrated or loose metallic filling greatly facilitates the molecular action
induced by the exterior field magnets.
In order to obtain a more active magnetic field than heretofore, I propose, in
lieu of using insulated copper wire, to wind insulated iron or steel wire on the field
magnets. The increased resistance which this metal affords I utilize as a creative
force, as it affords me a magnet in each convolution of the helix, or rather a series
of magnets (in each convolution) arranged with their poles at opposite sides of the
wire having their north poles to the left hand of the course of the current.
The field magnets may be made with or without a solid core, and the coating of
insulated wire may be enveloped in a casing of sheet iron. This again may be
covered by a second helix of iron or steel wire, which may be in its turn enclosed

page_text: in a casing of sheet iron; this second casing being covered or not with a helix of
insulated iron or steel wire and so on.
The field magnet thus composed I fit with end plates or pole pieces, which serve.
to connect the sheet iron coverings and the solid core together magnetically.
Insulated iron or steel wire may also be used for the coils of armatures, the coils
being so arranged as to cut the magnetic lines of force, although these lines of force
are at the same time carried from pole to pole by the coils.
When an armature of this kind is employed in the Elphinstone & Vincent
machine described in the specification of a Patent dated January 27th 1879,
N° 332, the opposing poles of the internal and external field magnets must be of 1
the same sign,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Wilson Vincent in the Great Seal Patent Office on the
12th September 1883.
CHARLES WILSON VINCENT of Holloway in the County of Middlesex "IMPROVE-
MENTS IN DYNAMO AND MAGNETO-ELECTRIC MACHINES"
This invention relates to means for obtaining magnetic fields of great strength
with a diminution in the weight and cost of the wire employed.
In order to obtain a more active magnetic field than heretofore, I propose in lieu
of using insulated copper wire to wind insulated iron or steel wire on the field
magnets The increased resistance which this metal affords I utilize as a creative
force, as it affords more magnetism in each convolution of the helix.
The field magnets may be made with or without a solid core and the coiled
envelope of insulated wire surrounding the core (when a core is used) may be
enclosed in a casing of sheet iron. This again may be surrounded by a second helix
of insulated iron or steel wire connected with the first helix, and it may be in its
turn enclosed in a casing of sheet iron. This second casing may if desired be
surrounded with a third helix of insulated iron or steel wire connected with the
second helix, and the magnet thus formed may be enlarged by one or more
additional helices enclosed in casings of sheet iron, and connected with the other
helices, each additional helix serving to increase the power of the magnet
The field magnet thus composed I fit with end plates or pole pieces, which serve
to connect the sheet iron coverings and the core (when one is used) together
magnetically.
In order further to increase the activity of the magnetic field I construct the
armatures of Dynamo electric machines with insulated iron or steel wire, instead of
using copper wire, as heretofore, for the hanks or coils.
When an armature of this kind is employed in the Elphinstone and Vincent
machine described in the specification of a patent dated January 27th 1879.
N° 332 the opposing poles of the internal and external field magnets must be of
the same sign in order that the wires which themselves carry lines of magnetic
force may nevertheless pass through strong magnetic fields, which in this case will
be found not in the lines of the opposed poles but intermediate of the poles, the
neutral points being in the lines of the opposed poles of the internal and external
magnets.
This will be better understood by reference to the accompanying diagram
where a a shew the neutral points between the internal and external field magnets
and b b the most active points in the field. The same remark applies also in
adapting this invention to the disc machine described in the specification of
Elphinstone and Vincents Patent dated May 18th 1882, N° 2340 the opposed poles
of the field magnets having similar, instead of dissimilar signs as described in that
specification. In constructing the field magnets of this machine I also propose to
employ insulated iron or steel wire
In applying this invention to dynamo electric machines of other constructions
than those above referred to, care must be taken that the poles of the field magnets
are so arranged that the iron wires constituting the armature move from fields of
greater to less intensity and vice versa.
In order to increase the magnetic field of magneto, electric machines, I employ
insulated iron, or steel wire in the manufacture of the armatures of such machines
the same provision as that just described with respect to the field magnets being
made-

page_text: By experiment I have found that the substitution of iron or steel wire for copper
wire, whether in the manufacture of field magnets, or of armatures, or of both, greatly
increases the efficiency of the machine, while at the same time a material reduction
is effected in the cost of the machine.
Having now set forth the nature of my invention of "Improvements in dynamo
and Magneto Electric Machines" and explained the manner of carrying the same
into effect, I wish it to be understood that under the above in part recited Letters
Patent I claim
First The construction of Field Magnets of Dynamo electric machines by the use
of insulated iron or steel wire as and for the purpose above set forth
Second The construction of armatures of Dynamo electric and Magneto electric
machines by the use of insulated iron or steel wire as and for the purpose above
set forth.
-
In witness whereof I the said Charles Wilson Vincent have hereunto set my
hand and seal the twelfth day of September in the year of our Lord One thousand
eight hundred and eighty three.