IMPROVEMENTS IN OR RELATING TO COMPENSATING DYNAMO ELECTRIC MACHINES
Year: 1882

page_text: LETTERS PATENT to Bernard Hippolyte Chameroy of Maisons Lafitte (Seine
et Oise) France for an invention of "IMPROVEMENTS IN OR RELATING TO
COMPENSATING DYNAMO ELECTRIC MACHINES
"
PROVISIONAL SPECIFICATION left by the said Bernhard Hippolyte
Chameroy at the Office of the Commissioners of Patents on the 16th May
1882.
BERNARD HIPPOLYTE CHAMEROY of Maisons Lafitte (Seine et Oise) France,
"IMPROVEMENTS IN OR RELATING TO COMPENSATING DYNAMO ELECTRIC MACHINES,
"
This invention has for its chief object the construction of dynamo electric-
machines in such a manner that when the resistance in the line is suddenly
reduced, this reduction will not cause the accumulation of considerable electro
motive force in the dynamo machine, by which accumulation of power not only are
these machines injuriously affected, but their speed being suddenly checked they
are rendered liable to injure the motor which actuates the same.
According to my invention I may construct a dynamo electric machine as
follows viz:
On a suitable bed plate I provide a standard or standards which afford bearings
for two short axles, shafts, or pins, from each of which is pendent an electro magnet
the lower end of which is so shaped that, when the two electro magnets are
suspended opposite one another a circular or nearly circular space will be formed
between them and this circular space is the magnetic field.
Instead of using an armature revolving in the magnetic field and constructed in
It consists of a
the usual manner, I employ what I may call an exciting coil.
shaft upon which is fastened, so as to form a helix or spiral a wire or wires
("câble") which carries a suitable number of coils ("bobines") which may or may
not have solid metal pieces inserted between them. In some cases I make the
shaft of suitable diameter and cut a helical groove into it (forming as it were a
deeply cut screw) and lodge the wire with the coils thercon in said groove.
The two electro magnets are free to approach the exciting coil (and one another)

page_text: or to recede therefrom, the extent of this motion being limited by a set screw and
spring or springs at their upper end by a stop at the bottom
On the bed plate at each side are fixed blocks of metal one block opposite each
magnet.
Now if the amount of current evolved is greater than that which could be taken
up by the line which the machine supplies, the excess current increases the
magnetism of the electro magnets and sets up attraction between these and the
above mentioned metal blocks, thereby the magnets are caused to recede from
the exciting coil and induction decreases so that the same speed of the prime
motor will produce a diminished current.
In another form of dynamo electric machine embodying my invention the
electro magnets are arranged by the side of, or around, a shaft. One end of this
shaft carries the exciting coil which is mounted on a sleeve free to slide upon said
shaft. At the other end of the shaft a pair of governor balls, or equivalent, are
mounted and connected, by suitable links with the shaft and also with the sleeve
on which the exciting coil is fixed.
On motion being imparted to the shaft centrifugal force acts upon the balls
which shift the sleeve so that the exciting coil approaches the magnets; when the
current becomes excessive the attraction of the magnets increases and with it
the resistance which is offered to the rotation of the exciting coil, this slackens the
speed, the balls (under the action of a coiled spring surrounding the shaft and
whose tension is adjustable) approach the axis of their rotation, shift the sleeve
and thus move the exciting coil away from the magnets
The coils are of helicoidal form and to collect the current I join the internal wire
of one coil to the external wire of the next and I solder these two wires to another
wire which is joined to the corresponding condenser
A modified form of my exciting coil consists of a shaft having collars between
which wires or rods carrying coils of conducting wire are so placed that the two
ends of each rod are diametrically opposite to one another, the ends of the conducting
wires are joined up with the condensers or the rods may carry the coils hereinabove
described joined in the same manner.
The condensers upon which the brushes bear having a straight part and an
oblique part the brushes bear on a neutral line whatever the position of the sleeve
on the shaft (of the second form above described) may be.
A form of condenser which I may use with advantage consists of a number of
separate condensers arranged in a circle, upon the periphery of which the brushes
bear.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Bernhard Hippolyte Chameroy in the Great Scal Patent Office
on the 16th November 1882.
"
BERNARD HIPPOLYTE CHAMEROY of Maisons Lafitte (Seine et Oise) France
"IMPROVEMENTS IN OR RELATING TO COMPENSATING DYNAMO ELECTRIC MACHINES
This invention has for its chief object the construction of dynamo electric
machines in such a manner that when the resistance in the line is suddenly reduced
this reduction will not cause the accumulation of considerable electro motive force
in the dynamo machine, by which accumulation not only are these machines
injuriously affected, but their speed being suddenly checked, they are rendered
liable to injure the motor which actuates the same.
According to my invention I construct a dynamo electric machine as follows,
namely:
On a suitable bed plate I provide a standard or standards which afford bearings
for two short axles, shafts, or pins from each of which is pendent an electro magnet
the lower end of which is so shaped that, when the two electro magnets are sus-
pended opposite one another, a circular or nearly circular space will be formed
between them and this circular space is the magnetic field. Instead of using an
armature revolving in the magnetic field and constructed in the usual manner I
employ what I may call an exciting coil. It consists of a shaft upon which is
fastened, so as to form a helix or spiral a wire or wires (cable) which carries a
suitable number of coils (bobines) which may or may not have solid metal pieces
inserted between them, In some cases I make the shaft of suitable diameter and
cut a helical groove into it (forming as it were a deeply cut screw) and lodge the
wire with the coils thereon in the said groove.
The two electro magnets are free to approach the exciting coil (and one another)
or to recede therefrom, the extent of this motion being limited by a set screw and
spring or springs at their upper end and by a stop at the bottom.
On the bed plate at each side are fixed blocks of metal, one block opposite each
magnet.
Now if the amount of current evolved is greater than that which could be taken
up by the line which the machine supplies, the excess current increases the magnetism
of the electro magnets and sets up attraction between these and the above men-
tioned metal-blocks; thereby the magnets are caused to recede from the exciting
coil and induction decreases so that the same speed of the prime-motor will produce
a diminished current.
In another form of dynamo electric machine embodying my invention the
electro magnets are arranged by the side of, or around a shaft, One end of
this shaft carries the exciting coil which is mounted upon a sleeve free to slide
upon said shaft. At the other end of the shaft a pair of governor balls or equivalent
are mounted and connected, by suitable links with the shaft and also with the
sleeve on which the exciting coil is fixed.
On motion being imparted to the shaft centrifugal power acts upon the balls
which shift the sleeve, so that the exciting coil approaches the magnets; when the
current becomes excessive the attraction of the magnets increases and with it the
resistance which is offered to the rotation of the exciting coil. This slackens the
speed, the balls (under the action of a coiled spring surrounding the shaft and
whose tension is adjustable) approach the axis of their rotation, shift the sleeve
and thus move the exciting coil away from the magnets.
The coils are of helicoidal form and to collect the current I join the internal

page_text: wire of one coil to the external wire of the next, and I solder these two wires to
another wire which is joined to the corresponding condenser.
CE
A modified form of my exciting coil" consists of a shaft having collars
between which wires or rods carrying coils of conducting wire are so placed that
the two ends of each rod are diametrically opposite to one another the ends of the
conducting wires are joined up with the condensers; or the rods may carry the coils
hereinabove described joined in the same manner.
The condensers, upon which the brushes bear having a straight part and an
oblique part the brushes bear on a neutral line whatever the position of the sleeve
on the shaft (of the second form above described) may be. Any suitable construction
of electro magnets may be used
A form of condenser which I may use with advantage consists of a number of
separate condensers arranged in a circle upon the periphery of which the brushes
In the accompanying drawings Figure 1 is an elevation of the machine, Figure 2
bear.
A Exciting coil, B B electro magnets C C axles or centres upon which the
electro-magnets move, D D plummer blocks or brackets, E framing, F F¹ metallic
masses, Gabutting piece, H H springs firmly connected with the electro-magnets,
I adjusting screw, J J brushes, K, K magnetic fields L iron wire conductor, M M
coils, O orifice of hole in shaft, P shaft, q q¹ terminals.
The electro magnets are movable and supported on the axles CC, they are
capable of moving away from the exciting coil A. When rotary motion is imparted
to the exciting coil the current is immediately established on connection being
made between the terminals q and q¹ and the light appears at the lamps included
in the circuit.
If by accident contact is made between the carbons of the regulators, or several
lamps are extinguished, a considerable quantity of fluid is immediately accumulated
in the dynamo-electric machine and would cause a resistance which would absorb
the total power of the motor furnishing the power, the above indicated arrange-
ments prevent this disastrous effect as the lower part of the electro-magnets K K
by reason of their magnetization, will move towards the metallic masses F F¹ and
the separation of the magnetic surfaces K K from the exciting coil A diminishes
the power of induction upon the coil A and it follows that the current looses its
intensity and the motor which operates this dynamo electric machine_always
furnishes the predetermined duty which can be regulated by the screw I acting
upon the springs H so arranged as to prevent free action of the oscillatory motion
of the electro magnets towards the metallic masses F F¹.
The coil is constructed as follows:
On a cable or core of iron wire L are wound coils m, m m whose quantity is
proportionate with the length of the cable L; the end N is inserted in the opening O
of the shaft P the cable thus covered is wound helically round the shaft P and its
other end is in a similar manner inserted in an opening in the shaft.
The coil is helicoidal in shape, and to collect the current I join the internal con-
ducting wire of one coil with the conducting wire upon the outside of the next coil,
I solder these wires to another wire which is fixed upon the corresponding collecting
device and I continue this mode of joining with the other coils.
Metallic masses between each coil in the space produced can be used if desired.
I may also use a shaft of sufficient diameter to produce a helix in the thickness
thereof which would form a screw and into this helicoidal space I insert my cable
furnished with coils as herein above described and I proceed in the same manner
for joining with the collectors.
The brushes J J transmit the electricity, which they collect to the electro
magnets and the terminals q q¹ serve to establish the circuit.

page_text: This arrangement represents an improvement m the conecting devICES
brushes.
In fact these brushes by their contact with the surface of the circle consisting
of several collecting devices receive from these latter the maximum of fluid
without the loss by "sparking" produced by the tangential friction of other
constructions.
A set screw will keep them in contact with the collecting devices
I reserve to myself the right to place the various parts whereof my dynamo
electric machines consist in any position that I may think convenient for causing
the same to produce maximum of electro motive force with the greatest
regularity.
Having now described my said invention and the manuer of performing the
same I wish it to be understood that what I claim and desire to protect under the
herein before in part recited Letters Patent is
1st A dynamo electric machine in which the strength of the current is con-
trolled by causing the variations of said current to regulate the distance between
the exciting coils and the electro magnets whether directly by the influence of
the current in the machine as in Figuro 1 or with the intervention of
mechanical devices as in Figure 2 substantially as and for the purposes set forth.
2nd The employment of rings in the construction of exciting coils substantially
as set forth.
In witness whereof I the said Bernard Hippolyte Chameroy have hereunt
set my hand and seal this ninth day of November in the year of Our Lord
One thousand eight hundred and eighty two.
BERNARD HIPPOLYTE CHAMEROY, (L.S.)