Year: 1896

page_text: Date of Application, 13th Aug., 1896
Complete Specification Left, 4th May, 1897-Accepted, 28th June, 1897
We, ALBERT DE PUYDT and MAXIMILIEN PONCIN, both of 15 Quai Cockerill,
Seraing, Belgium, Engineers, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improvements in continuous current generator dynamos
or motor dynamos.
Upon the accompanying drawings illustrating our invention―
Figure 1 is a sectional elevation on line D-D of Figure 2 of a dynamo
constructed according to our invention;
Figure 2 being a transverse section on line A-A of Figure 1;
Figure 3, a part section of the same shewing the bearing of the shaft arranged
outside of the core magnets;
Figure 4 is a section through the central part of the revolving shaft and cylinder
shewing a modification;
Figures 5 and 6 are similar views shewing modifications adapted to dynamos with
vertical axes; and
Figure 7 is an end elovation shewing the arrangement of an adjustable spring
bearing for a vertical shaft.
On the drawings, a, a is a steel or iron core which forms the shaft of the dynamo,
as well as a part of the electro-magnet and the revolving armature. The shaft a, a is
formed with bearings at its extremities on which it rotates, whilst its middle portion
carries a cylindrical enlargement or boss a¹ forming part of the armature proper,
and, at the same time, a part of the magnet; (see Figures 1 and 2). In the
cylindrical boss a¹, and extending through it, are a number of rods c, being metallic
conductors of electricity, insulated from the boss. Upon the drawing, four of these
rods are shewn, but their number may be greater or smaller. Each of the
conducting rods c is electrically connected at each end with a continuous ring d,
also formed of conducting metal; thus there may be four rings d at each extremity
of the boss a', as shewn. The conducting rods c are insulated for their entire
length as far as to their points of connection with the two corresponding rings d.
These latter are insulated from each other and from the other part of the apparatus;
upon each of the rings d a number of small metallic brushes or suitable rubbers f
(Figs. 1 and 2) exert slight frictional pressure for the purpose of completing the
electrical circuit, either by direct connection with the outer circuit, or by connection
with each other those on the right with those on the left-so as to couple several
rods c in tension.
Core-magnets g and cause a circulation of the magnetic fluid in the direction
indicated by the arrows.
The magnetic circuit is completed by a fixed steel or iron cylinder bored to an
internal diameter slightly greater than the external diameter of the rotary part a, a¹.
The fixed cylinder lis magnetically connected to the cores of the magnets g and h
by discs or covers n and intermediate pieces n'.
The cores of the magnets 9 and h, in the arrangement shewn in Figures 1 and 2,
serve as bearings for the rotary shaft a. We may also provide bearings a³ for the
shaft, outside of the magnets-as shewn in Figure 3.

page_text: If the inner cylinder a, a' is caused to rotate, the magnets being excited in the
usual manner, each rod c revolving forms with its two rings d, its set of brushes f
and the conducting wire or outer circuit, a circle which becomes the seat of a
continuous electro-motive force. The connections of the brushes on the left with
those on the right may consist of insulated rods passing through the fixed cylinder
parallel to the revolving conducting rods c; or in lieu of such insulated rods we
may employ wire cables, or plates of suitable form for the connections of the
brushes.
In a modification shewn on Fig. 4, the fixed cylinder is replaced by fixed
plates m, the boss or cylindrical enlargement a' being in that case increased in
diameter and shortened as required. The return of the magnetic fluid is then
made towards the covers n over the surfaces of the plates m adjacent to the
boss a¹.
.
In cases where the axis of the dynamo is arranged vertically, we may in order to
diminish friction, arrange to magnetically suspend the revolving part of the dynamo
by means of one of the pole-pieces shewn in Figures 5, 6 and 7. Two modifications
of this arrangement are shewn in Figs. 5 and 6, for cases where the axis is
vertical.
Figure 5 illustrates an arrangement in which the force of attraction between
the pole-piece and the revolving part is practically equal to the weight of the
latter.
Figure 6 shews an arrangement in which the force of attraction between the
pole-piece and the revolving part is adjusted to the weight of the latter by a special
device.
In dynamos to which Figures 5, 6 and 7 particularly refer, the axis of rotation is
vertical, and the present invention has for object to overcome as far as possible the
friction of the lower end of the shaft T upon its support. For this purpose a ring
or flange 9 formed in a piece with the outer pole-piece r, or magnetically united:
therewith, is arranged at a very short distance above the revolving part a, a', as
shewn in Fig. 5; or there may be arranged as in Fig. 6, under the same conditions
as in Fig. 5, above and below the revolving part a, a, two flanges g, g' the surfaces
of which opposite to the revolving part a, a are of different areas.
Attruction is developed between the revolving part a, a', and the flange 9 of the
pole-piece in the arrangement shewn in Fig. 5, and the revolving part is
thereby drawn upwards by a magnetic force nearly equal to its own weight, so that
the friction of the lower end of the shaft on its support is materially reduced and
almost nullified.
In the modification shown in Fig. 6, the total area of the surfaces between the
revolving part a, a' and the flanges 9, q is increased. In this latter arrangement
where the magnetic fluid necessary for the machine, would determine an attraction
in excess of the weight of the revolving part a, a, we arrange for the surface of
the flange g' opposite the revolving part to be of less area than the flange q (Fig. 6),
so that the difference in the force of attraction of the flanges q and may be
approximately equal to the weight of the revolving part a, a.
Figure 7 shows an arrangement of au adjustable spring bearing to allow the
shaft of the dynamo to rotate around a centre other than its geometric axis, though
still passing through its centre of gravity. In effect, to maintain the equilibriun
of the revolving part a, a', we make use of a bearings uniformly supported by
springs t adjustable by means of screws . These may be either plate springs or
spiral springs, and the adjustable bearings may be either at one end, or both ends
of the shaft.

page_text: COMPLETE
Improvements in Continuous Current Generator Dynamos or Motor
Dynamos.
We, ALBERT DE PUYDT and MAXIMILIEN PONCIN, both of 15 Quai Cockerill,
Seraing, Belgium, Engineers, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to improvements in continuous current generator dynamos
or motor dynamos.
Referring to the drawings filed with our Provisional Specification and illustrating
our invention-
Figure 1 is a sectional elevation on line D-D of Figure 2 of a dynamo
constructed according to our invention;
Figure 2 being a transverse section on line A-A of Figure 1;
Figure 3, a part section of the same shewing the bearing of the shaft arranged
outside of the core magnets;
Figure 4 is a section through the central part of the revolving shaft and cylinder
shewing a modification;
Figures 5 and 6 are similar views shewing modifications adapted to dynamos with
vertical axes: and
Figure 7 is an end elevation shewing the arrangement of an adjustable spring
bearing for a vertical shaft.
On the drawings, a, a is a steel or iron core which forms the shaft of the dynamo,"
The shaft a, a
as well as a part of the electro-magnet and the revolving armature.
is formed with bearings at its extremities on which it rotates, whilst its middle
portion carries a cylindrical enlargement or boss a' forming part of the armature
proper and, at the same time, a part of the magnet; (see Figs. 1 and 2). In the.
cylindrical boss a', and extending through it, are a number of rods c, being metallic
conductors of electricity, insulated from the boss. Upon the drawing four of these.
rods are shewn, but the number may be greater or less.
In the arrangement shewn, each of the conducting rods e is electrically connected
at each end with a continuous ring d, also formed of conducting metal: thus there
may be four rings d at each extremity of the boss a', as shewn; but several of the
rods c may be connected at their ends with a single ring d.
The conducting rods c are insulated for their entire length ar far as their points
of connection with the two corresponding rings d. These latter are insulated from
each other and from the other part of the apparatus. Upon each of the rings da:
number of small metallic brushes or suitable rubbers f (Figs. 1 and 2) exert slight..
frictional pressure for the purpose of completing the electrical circuit, either by
direct connection with the outer circuit, or by connection with each other-those
on the right with those on the left-so as to couple several rods c in tension.
Core-magnets, g and A, cause a circulation of the magnetic fluid in the direction.
indicated by the arrows.
The magnetic circuit is completed by a fixed steel or iron cylinder / bored to an
internal diameter slightly greater than the external diameter of the rotary part a, a¹.
The fixed cylinder lis magnetically connected to the cores of the magnets g and h
by discs or covers n and intermediate pieces n'.
The cores of the magnets, g and h, in the arrangement shewn in Figures 1 and 2,
serve as bearings for the rotary shaft: we may also provide bearings a' for the
shaft, outside of the magnets-as shewn in Figure 3.

page_text: If the inner cylinder a, al is caused to rotate, the magnets being excited in the
usual manner, each rod or group of rods e revolving, forms with its two rings d, its
set of brushes f, and the conducting wire or outer circuit, an electric circuit which
becomes the seat of a continuous electro-motive force. The connections of the
brushes on the right with those on the left may consist of insulated rods passing
through the fixed cylinder 1, parallel to the revolving conducting rods c;-or in lieu
of such insulated rods, we may employ wire cables, or plates of suitable form for the
connections of the brushes.
In every case, we may point out that the fixed magnetic piece, l, n', n, on
Figs. 1, 2, 3 and 4, and r on Figs. 5 and 6, has no other object or purpose than to
render the magnetic circuit a better conductor; beyond this, such fixed piece has no
influence upon the electro-motive force produced and it may be suppressed without
altering the result, on the sole condition of having the same total flux in the
revolving magnetic piece a, a¹.
Our improved dynamo differs from all continuous current dynamos without a
collector, in the essential feature that the revolving conductors c, do not intersect
the flow of magnetism, or in other words, that there is in it no relative movement
between the revolving conductor rods c and the entire magnetic cylinder a, a'.
In a modification shewn in Fig. 4, the fixed cylinder is replaced by fixed
plates m, the boss or enlargement a being in that case increased in diameter
and shortened as required. The return of the magnetic fluid is then made
towards the covers n over the surfaces of the plates m adjacent to the
boss a².
In cases where the axis of the dynamo is arranged vertically, we may in
order to diminish friction, arrange to magnetically suspend the revolving part
of the dynamo by means of one of the pole-pieces shewn in Figs. 5 and 6.
Two modifications of this arrangement are shewn in Figures 5 and 6, but we
do claim this as part of our invention.
As shewn in Fig. 5, a ring or flange g formed in a piece with the outer
pole-piece ŕ, or magnetically united therewith, is arranged at a
very short
distance above the revolving part a, a: or there may be arranged, as in
Fig. 6, under the same conditions as in Fig. 5, above and below the revolving
part a, a, two flanges q, q¹ the surfaces of which opposite the revolving
part a, al are of different areas.
In the arrangement shewn in Fig. 5, attraction is developed between the
revolving part a, a' and the flange g of the pole-piece r, and the revolving
part is thereby drawn upwards by a magnetic force nearly equal to its own
weight, so that the friction of the lower end of the shaft on its support
is materially reduced and almost nullified. The arrangement shewn in Fig. 6
is such that the difference in the force of attraction of the flanges q, q' is
approximately equal to the weight of the revolving part a, a'.
Figure 7 shews an arrangement of an adjustable spring bearing to allow the
shaft of the dynamo to rotate around a centre other than its geometric axis,
though still passing through its centre of gravity. In effect, to maintain the
equilibrium of the revolving part a, a', we make use of a bearing s supported solely
by springs t adjustable by means of screws : such springs may be either plate or
spiral springs, and a bearings, of the above description, inay be arranged either at
one end or at both ends of the shaft, but we do not claim such arrangement as part
of our invention.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
A continuous current generator dynamo or motor dynamo characterised by a
magnetic metallic cylinder a, a',-shewn in Figures 1, 2, 3 and 4 of the drawings
filed with our Provisional Specification-constituting at once an electro-magnet
and an armature, provided with electrically insulated conducting-rods c passing

page_text: through it parallel with its axis and electrically connected individually or in a
group at each extremity to a ring d insulated from adjacent rings d'and from
the rest of the apparatus, in such a manner that the revolving conductors c do
not intercept the magnetic current, or in other words, in such a manner that
there is no relative movement between the revolving conducting rods and the
entire magnetic cylinder a, a', as and for the purposes described with reference
to the drawings filed with our Provisional Specification.
Dated this 4th day of May 1897.
For the Applicants,
GEDGE & FEENY,
60 Queen Victoria Street, London, E.C., Chartered Patent Agents.