Year: 1898

page_text: improve
I, ALBERT BOCQUENTIN, of Joinville-le-Pont, near Paris, in the Republic of
France, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to machines, commonly known as "dynamos," for the
generation of a current of electricity, or as motors," for obtaining power from
a current of electricity passed through them. It has for its object a novel method
of constructing and arranging the parts of such machines, so that they are very
effective, compact, and portable, and of considerably less weight than has here-
tofore ordinarily been the case.
Such machines consist essentially of an armature, and of field magnets, either
single or multiple.
These field magnets are themselves formed of parts round which are wound
the insulated wires through which an electric current is passed, these parts form-
ing the field magnets properly so called, whilst other parts heavier and more
massive connect together the parts of the field magnet on the opposite side to
their poles.
These connecting parts, in many cases, constitute the heaviest part of the
entire machine and very frequently, for the traction of vehicles for example,
it would be of great advantage to do away with such heavy parts, or to replace
them by another armature, which, whilst affording passage to the magnetic flow,
would at the same time constitute an active part itself for the production or
transformation of electric energy.
This arrangement has already been tried, but it has necessitated the use of
two commutators or collectors placed outside the two armatures, the machine
being thus of greater length, and the spindle or axle stronger, heavier, and more
expensive.
In my present invention I make use of two armatures upon the same spindle
or shaft, their insulated coils being led to a commutator common to both arma-
tures, fixed in the space between them, upon the spindle, and in this way the
bearings can be placed close to the armatures, and the spindle itself is shorter,
and for these two reasons the stability of the machine is greater, and an increased
speed of rotation can be safely attained.
Supposing that my invention is to be applied to a machine having field
magnets of four poles, the machine consists of two parallel side plates or frames
of a non-magnetic metal such as brass or aluminium, stayed and held at a suit-
able distance apart by four stays which themselves form the cores of the field
magnets.
At the centre of the parallel plates are formed or fixed bearings in which the
spindle or shaft of the machine revolves freely. Upon this spindle are fixed
two frames which carry at their outer parts or circumference the two armatures

page_text: "
which are preferably of the well-known "Gramme' or "Pacinotti ring" type,
but may be of any other suitable kind. At each end of the field magnet cores
(inside the frames) are formed extensions constituting suitably shaped pole
pieces in close proximity to which the external circumference of the armatures
revolves, the central part of the cores between these pole pieces being wound
with insulated wire through which the inducing current is passed.
Between the two armatures is fixed upon the spindle a collector or commu-
tator, to the insulated conducting blades of which the insulated wires of the
armatures are connected in the usual way.
I
In order that only one pair of brushes, instead of two, may be necessary,
connect electrically each pair of diametrically opposite conducting plates, in
the commutator.
Insulated wires, properly wound according to the requirements of the machine,
are coiled round bobbins upon the cores of the field magnets between the end
pole-pieces already described, and upon these cores may also be supported the
brush holders from which conducting wires pass to suitable terminals.
The insulated wires round the field magnets are generally connected with
terminals fixed upon the plates, but where the apparatus is to be used as a motor
for a vehicle or the like purpose, these wires are not attached to the machine
but are led away and attached directly to the controlling or coupling device of
the carriage.
It will be seen that in my improved apparatus I use two armatures fixed upon
the same spindle, upon which a commutator or collector common to both is fixed
between them. Also, of field magnets extending from one armature to the other
one, parallel to the spindle or axis, in the manner described.
I do not, however, confine myself to the precise method of construction and
arrangement, which may be varied more or less, as, for instance, in the number
of field magnets, and the type of armature, and the method of winding, and
the kind of commutator or collector used.
Dated this 2nd Jaw of A
1000
Improvements in Electric Generators and Motors.
I, ALBERT BOCQUENTIN, of Joinville-le-Pont, near Paris, in the Republic of
France, Manufacturer, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement, and accompanying drawing, that is
to say:
-
"
"
dynamos," for
My present invention relates to machines, commonly known as
the generation of a current of electricity, or as motors," for obtaining power from
a current of electricity passed through them. It has for its object a novel method
of constructing and arranging the parts of such machines, so that they are very
effective, compact, and portable, and of considerably less weight than has here-
tofore ordinarily been the case.
Such machines consist essentially of an armature, and of field magnets, either
single or multiple.
These field magnets are themselves formed of parts round which are wound
the insulated wires through which an electric current is passed, these parts form-
ing the field magnets properly so called, whilst other parts heavier and more

page_text: massive connect together the parts of the field magnet on the opposite side to
their poles.
These connecting parts, in many cases, constitute the heaviest part of the
entire machine and very frequently, for the traction of vehicles for example,
it would be of great advantage to do away with such heavy parts, or to replace
them by another armature, which, whilst affording passage to the magnetic flow,
would at the same time constitute an active part itself for the production or
transformation of electric energy.
This arrangement has already been tried, but it has necessitated the use. of
two commutators or collectors placed outside the two armatures, the machine
being thus of greater length, and the spindle or axle requiring to be stronger,
heavier, and more expensive.
In my present invention I make use of two armatures fixed upon the same
spindle or shaft, their insulated coils being led to a single collector or commu-
tator common to both armatures, and fixed in the space between them, upon
the spindle, and by this novel method of construction the bearings can be placed
close to the armatures, whilst the spindle itself is shorter, and for these two
reasons the stability of the machine is greater, and an increased speed of rota-
tion can be safely attained.
In order to put my invention in operation, and supposing that it is to be
applied to a machine having field magnets of four poles, (as illustrated in the
accompanying drawing, in which Figure 1 is a transverse section perpendicular
to the axis of rotation, and adjoining the brush holders, and Figure 2 is a longi-
tudinal section through the axis, showing a side view of the brush holders), I
make the machine consist of two parallel side plates or frames B, B', of a non-
magnetic metal such as brass or aluminium, stayed and held at a suitable dis-
tance apart by four stays which themselves form the cores 61, 62, 63, and 6', of
the field magnets.
"
66
"
At the centre of the parallel plates are formed or fixed bearings c, c', in which
the spindle or shaft A of the machine revolves freely. Upon this spindle are
fixed two frames d and d¹ which carry at their outer part or circumference
the two armatures a and a¹, which are preferably of the well-known Gramme
or Pacinotti ring" type but may be of any other suitable kind.. At each
end of the field magnet cores b¹, 63, 63, 64, (inside the frames B, B¹) are formed
extensions P1, P2, P3, P4, constituting suitably shaped pole pieces in close proxi-
mity to which the external circumference of the armatures revolves, the central
part of the cores between these pole-pieces being wound in the usual ways with
insulated wire, "shunt" and " series," through which the inducing current
is passed.
Between the two armatures a and a¹ is fixed upon the spindle A an insulated
collector or commutator C common to both, to the insulated conducting brushes
or blades of which the insulated wires of the armatures are connected in the
usual way.
In order that only one pair of brushes, instead of two, may be necessary,
connect electrically each pair of diametrically opposite conducting plates in the
commutator C.
Insulated wires, properly wound as above described according to the require-
ments of the machine, are coiled round bobbins upon the cores of the field
magnets between the end pole-pieces already described, and upon these cores
may also be supported and fixed the brush holders and brushes h+ and h- from
which conducting wires pass to suitable + and terminals.
The insulated wires are generally connected with terminals fixed upon the
plates, but where the apparatus is to be used as a motor for a vehicle or the like
purpose, these wires are not attached to the machine but are led away and
attached directly to the controlling or coupling device of the carriage.
It will be seen that in my improved apparatus I use two armatures fixed upon
the same spindle, upon which a commutator or collector common to both is fixed

page_text: between them. Also, of field magnets extending from one armature to the
other one, parallel to the spindle or axis, in the manner described.
I do not, however, confine myself to the precise method of construction and
arrangement, which may be varied more or less, as, for instance, in the number
of field magnets, and the type of armature, and the method of winding, and
the kind of commutator or collector used, but
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what
I claim is:
-
1. In electric generators and motors, the use of two armatures fixed upon
the same spindle, substantially as and for the purpose described.
2. In the electric generator or motor described and claimed in Claim 1, the
use of a single collector or commutator fixed upon the spindle between the two
armatures and common to both armatures, substantially as described.
3. In electric generators and motors described and claimed in Claims 1
and 2, a field magnet or magnets extending from one armature to the other
parallel to the axis of the armatures, substantially as and for the purpose
described.
Dated this ora day of August
1000.
EDWARDS AND Co.,
Chartered Patent Agents, 65 and 66, Chancery Lane, London,
Agents for the Applicant.