A GALVANO-MAGNETO- DYNAMO-ELECTRIC MACHINE
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by the said Charles Dubos at the Office
of the Commissioners of Patents on the 25th February 1879.
CHARLES DUBOS, of Paris (France), Electrical Engineer. "A GALVANO-MAGNETO-
DYNAMO-ELECTRIC MACHINE."
This Invention relates to the construction of galvano-magneto-dynamo-electric
machines whereby mechanical power applied to cause revolution of coils of insulated
wire through polar fields of electro-magnets is converted into electricity. For this
purpose the electro magnets are made in the form of double rings of soft cast iron
having segmental collars on them, between each pair of which insulated wire is
coiled transversely to the circumference of the ring over the double annular cores,
each coil being so wound or so connected in the circuit of the machine that the
electrical current through its coil is in the opposite direction to that in the next
coil on each side of it. Thus the intermediate segments are made of alternating
polarity. Within this annular electro-magnet is caused to rotate a disc, which may
be of wood, having fixed round its periphery a number of coils of insulated wire
equivalent to the number of polar segments of the ring, so that each coil in passing
through each of the polar fields of these segments has alternating electrical currents
induced in its wire. These currents are led to a commutator, where they are
collected, to be passed through the external circuit as well as through the coils of
the ring. In the first instance the ring coils may be charged from a battery or
other source of electricity, or their charge from such source may be continued so as
to maintain and increase the magnetic power of the segments during the working
of the machine. Although I have mentioned above the arrangement of one ring
and its internal rotating disc, it is to be understood that a number of these rings
Davies 1

page_text: are placed side by side on one framing, each with its internal disc, all these discs
being fixed on one rotating shaft As a modification of the construction, instead of
thus making and fixing a number of rings side by side, I provide a number of
cranked spindles, which I fix at intervals apart all round the circumferences of the
rotating discs. On each of the cranks, and also on each of the intermediate parts
of each cranked spindle, I coil insulated wire so wound or connected as to present
in the spaces between adjoining cranks magnetic fields of alternating polarity,
through which the coils of the discs pass when they revolve, thereby having alter-
nating electrical currents induced in them, which currents are collected in the usual
way by a commutator.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Dubos in the Great Seal Patent Office on the 30th July
1879.
•
CHARLES DUBOS, of Paris (France), Electrical Engineer. "A GALVANO-MAGNETO-
DYNAMO-ELECTRIC MACHINE."
This Invention relates to the construction of galvano-inagneto-dynamo-electric
machines whereby mechanical power applied to cause revolution of coils of insulated
wire through polar fields of electro-magnets is converted into electricity. For this
purpose the electro-magnets are made in the form of rings of soft cast iron having
segmental collars on them, between each pair of which insulated wire is coiled
transversely to the circumference of the ring over the double annular cores, each
coil being so wound or so connected in the circuit of the machine that the electrical
current through its coil is in the opposite direction to that in the next coil on each
side of it. Thus the intermediate segments are made of alternating polarity.
Within this annular electro-magnet is caused to rotate a disc, which may be of wood
having fixed round its periphery a number of coils of insulated wire equivalent to
the number of polar segments of the ring, so that each coil in passing through each
of the polar fields of these segments has alternating electrical currents induced in
its wire. These currents are led to a commutator, where they are collected to be.
passed through the external circuit as well as through the coils of the ring. In the
first instance the ring coils may be charged from a battery or other source of èlec-
tricity, or their charge from such source may be continued so as to maintain and
increase the magnetic power of the segments during the working of the machine.
Although I have mentioned above the arrangement of one ring and its internal
rotating disc, it is to be understood that a number of these rings are placed side
by side on one framing, each with its internal disc, all these discs being fixed on
one rotating shaft. As a modification of the construction, instead of thus making
and fixing a number of rings side by side, I provide a number of cranked spindles,
which I fix at intervals apart all round the circumferences of the rotating discs.
On each of the cranks, and also on each of the intermediate parts of each cranked
spindle, I coil insulated wire so wound or connected as to present in the spaces
between adjoining cranks magnetic fields of alternating polarity, through which
the coils of the discs pass when they revolve, thereby having alternating electrical
currents induced in them, which currents are collected in the usual way by a
commutator.
:
:

page_text: iron cores are employed, interferes greatly with the action of the machine. The
shaft O carrying the armatures being driven by a band on a pulley X or otherwise,
the electric currents induced in the revolving coils are collected by a commutator in.
the ordinary way, and may be led by terminals D to the external circuit. Fig. 6
is a side view of part of a modified form of machine, in which the stationary electro
magnets consist of a number of cranked bars a, b, coiled with insulated wire so as
to give the cheeks of the cranks 6 alternate polarity. Between these cheeks the
coils C of the armature revolve. It will be seen that according to either arrange-
ment of the machine the poles of the armature cores move in close proximity to the
polar fields of the electro-magnets, and the latter having their cores made of cast
iron retain residual magnetism, and are capable of receiving a high degree of
saturation.
Having thus described the nature of my Invention, and in what manner the
same is to be performed, I claim,—
First. The construction of galvano-magneto-dynamo electric machine herein
described with reference to Figs. 1, 2, 3, 4, and 5 of the accompanying Drawings.
Second. The modified construction described with reference to Fig. 6.
In witness whereof, I, the said Charles Dubos, have hereunto set my hand
and seal, this Twenty second day of July, in the year of our Lord One
thousand eight hundred and seventy nine.
Witness,
JULES ARMENGAUD, jeune,
of Paris, Bd de Strasbourg, 23,
Civil Engineer.
CHARLES DUBOS. (L.S.)