Improvements in Dynamo Electric Machines.
Year: 1892

page_text: Date of Application, 7th Dec., 1892
Complete Specification Left, 4th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Dynamo Electric Machines.
I, CHARLES EUGEN LANCELOT BROWN, of Baden, Switzerland, Engineer and
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in dynamo electric machines of
the alternating current type as I will now proceed to explain by aid of the
accompanying drawings in which,
Fig. 1 shows such a machine partly in elevation and partly in cross section; and
Fig. 2 is a longitudinal section thereof partly in elevation.
Figs. 3 and 4 show a modified construction of armature suitable for dynamos of
large size.
Figs. 5 and 6 are elevations at right angles to each other illustrating a core for
use in winding the armature coils.
The field magnet of this machine comprises a divided iron ring C to which are
fixed by bolts B the field magnet cores N which are made of cylindrical form in
order to facilitate winding, and to reduce the amount of wire as much as possible.
The inner ends N¹ of these cores, forming the pole pieces, are enlarged and made
of rectangular shape so that besides serving to reduce the magnetic resistance they
also aid in keeping the magnet windings in position.
At
The armature comprises a star wheel or spider A upon which are mounted
insulated annular plates or laminæ preferably of wrought iron to form the armature
core A' these plates or laminæ being formed on their inner periphery with suitable
grooves for the reception of the arms of the star wheel or spider as shown. The
star wheel or spider is elongated and extends beyond the sheet metal core.
each end it carries a ring of cast iron G through which pass tie-bolts D. The
armature core is securely clamped between the said rings by tightening up these
bolts, the external diameter of the rings being equal to that of the armature core.
To diminish magnetic dispersion, the said armature core is made of such width as
to extend slightly beyond each side of the pole pieces N¹.
The external periphery of the armature core and the rings G are covered with
an insulating layer of suitable material, such for instance as a continuous winding or
wrapping of paper, or mica plates.
As the external periphery of the armature is quite cylindrical, it is easy to
maintain perfect insulation, even for very high tensions.
F, F, are armature coils which after being wound to a rectangular form on a
suitable core are curved to conform to the outer periphery of the armature on
which they are secured by suitable bands. Between these bands and the coils
there is an insulating layer similar to that on the armature-iron.
To ensure proper and efficient driving, and to prevent shifting of the coils, each
coil is provided with a core, for instance of wood, that is fixed in position on the
armature by suitable pins or studs g secured in the armature core.
In
Figs. 3 and 4 illustrate the modified arrangement of armature for dynamos of
large diameter such for instance as are usually coupled directly to turbines.
this case the two rings G between which the sheet metal laminæ composing the
armature core A' is clamped are constructed with arms B' by which they are
connected to and driven by the armature shaft. They are connected together by a
series of tie-bolts L which pass through corresponding holes in the annular sheet
metal laminæ of the armature. The said annular laminæ may in this case be each
made in segments instead of in one piece, and are fitted together in such a manner
that the lines of division between the segments of one lamina come between those
of the next.

page_text: The distance apart of the rings G is determined by ribs n cast upon the arms B₁
carrying them. The two rings are further connected by tie-bolts that pass through
flanges M formed at the inner ends of bosses that are cast in one with the arms B¹
and fit the armature driving shaft.
The form of core I prefer to employ for winding the armature coils is shown in
Figs. 5 and 6. It is provided with two strong flanges the corners of which are
cut away as shown at O' so as to enable the coils of wire to be readily bound
together by suitable bands. The edges of the core are slightly hollowed out in
order to produce a rectangular coil that shall have straight layers. When the
coiling is effected on a core having straight edges as has heretofore been usual the
layers always bend out to a greater or less extent.
The several coils of the armature may be coupled up in series or in parallel.
The current is collected from two rings H which are mounted on but insulated
from the armature shaft, and are connected by wires with the ends of the armature
winding. These wires pass through insulating thimbles having conical heads
fitted into the rings G and kept in place by the insulation and the armature coils.
Dated this 7th day of December 1892.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.Č., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Dynamo Electric Machines.
I, CHARLES EUGEN LANCELOT BROWN,, of Baden, Switzerland, Engineer and
Manufacturer, 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 has reference to improvements in dynamo electric machines of the
alternating current type as I will now proceed to explain by aid of the drawings
filed with my Provisional Specification and in which,
Fig. 1 shows such a machine partly in elevation and partly in cross section; and
Fig. 2 is a longitudinal section thereof partly in elevation.
Figs. 3 and 4 show a modified construction of armature suitable for dynamos of
large size.
Figs. 5 and 6 are elevations at right angles to each other illustrating a core for
use in winding the armature coils.
The field magnet of the machine shown in Figs. 1 and 2 comprises a divided iron
ring C to which are fixed by bolts B the field magnet cores N which are made of
cylindrical form in order to facilitate winding and to reduce the amount of wire as
much as possible. The inner ends N' of these cores, forming the pole pieces, are
enlarged and made of rectangular shape so that besides serving to reduce the
magnetic resistance, they also aid in keeping the magnet windings in position.
The armature comprises a star wheel or spider A upon which are mounted
insulated annular plates or lamina, preferably of wrought iron, to form the
armature core A', these plates or laminæ being formed on their inner periphery
with suitable grooves for the reception of the arms of the star wheel or spider as
shown. The star wheel or spider is elongated and extends beyond the sheet metal
At each end it carries a ring of cast iron G through which pass tie-bolts D.
The armature core is securely clamped between the said rings by tightening up
these bolts, the external diameter of the rings being equal to that of the armature
core. To diminish magnetic dispersion, the said armature core is made of such
width as to extend slightly beyond each side of the pole pieces N'.
core.
The external periphery of the armature core and the rings G are covered with
an insulating layer of suitable material, such for instance as a continuous winding
or wrapping of paper, or mica sheets.
☐

page_text: As the external periphery of the armature is quite cylindrical, it is easy to
maintain perfect insulation, even for very high tensions.
F, F, are armature coils which, after being wound to a rectangular form on a
suitable core, are curved to conform to the outer periphery of the armature on
which they are secured by suitable bands. Between these bands and the coils there
is an insulating layer similar to that on the armature-iron.
To ensure proper and efficient driving, and to prevent shifting of the coils, each
coil is provided with a core, for instance of wood, that is fixed in position on the
armature by suitable pins or studs 9 secured in the armature core.
Figs. 3 and 4 illustrate a modified arrangement of armature for dynamos of large
diameter, such for instance as are usually coupled directly to turbines. In this
case the two rings G, between which the sheet metal laminæ composing the
armature core A' are clamped, are constructed with arms B' by which they are
connected to and driven by the armature shaft. They are connected together by
a series of tie-bolts L which pass through corresponding holes in the annular sheet
metal lamina of the armature. The said annular laminæ may in this case be each
made in segments instead of in one piece, and are fitted together in such a manner
that the lines of division between the segments of one lamina come between those
of the next.
The distance apart of the rings G is determined by ribs n cast upon the arms B₁
carrying them. The two rings are further connected by tie-bolts that pass through
flanges M formed at the inner ends of bosses that are cast in one with the arms B¹
and fit the armature driving shaft.
The form of core I prefer to employ for winding the armature coils is shown in
Figs. 5 and 6. It is provided with two strong flanges O the corners of which are
cut away as shown at O₁ so as to enable the coils of wire to be readily bound
together by suitable bands. The edges of the core are slightly hollowed out in
order to produce a rectangular coil that shall have straight layers. When the
coiling is effected on a core having straight edges, as has heretofore been usual,
the layers always bend out to a greater or less extent.
The several coils of the armature may be coupled up in series or in parallel.
The current is collected from two rings H which are mounted on, but insulated
from, the armature shaft, and are connected by wires f with the ends of the
armature winding. These wires f pass through insulating tubes or thimbles having
conical heads fitted into the rings G and kept in place by the insulation and the
armature coils.
Having now particularly described and ascertained the nature of the said inven
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In an alternate current dynamo a stationary field magnet comprising a ring
carrying cylindrical magnet cores having rectangular pole pieces that are of greater
cross-sectional area than the cylindrical cores for the purpose of reducing the
magnetic resistance, substantially as herein described.
2. In an alternating current dynamo, an armature core composed of insulated
annular plates or laminæ held between two thick cast iron rings of the same
external diameter as the said armature core substantially as described.
3. In an alternating current dynamo, a cylindrical armature provided with
continuous layers of insulating material arranged above and below the armature
coils substantially as described.
4. An alternating current dynamo having a cylindrical armature core provided
with armature coils arranged to lie close to its outer periphery, the said armature
coils having non-conducting core pieces and being held in place on the core by
pins g substantially as herein described.
5. In an alternating current dynamo, an armature core of the kind specified in
Claim 1, but in which the insulated annular sheet metal plates or laminæ of which

page_text: the said core is built up, are each composed of a number of segments held together
by means of bolts passing through the said core, substantially as described.
6. The improved alternating current dynamo constructed substantially as herein-
before described with reference to and shown in Figs. 1 and 2, or modified according
to Figs. 3 and 4 of the drawings.
Dated this 4th day of September 1893.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.