Improved Winding for Drum Armatures of Dynamos and Electro Motors.
Year: 1891

page_text: Date of Application, 9th Oct., 1891
Complete Specification Left. 22nd June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
Improved Winding for Drum Armatures of Dynamos and
Electro Motors.
$
We, SIEMENS BROS. & Co. LIMITED of 12 Queen Anne's Gate, Westminster,
in the County of Middlesex, and JOHN NEBEL, of 3 White House Villas,
Woodlands, Charlton, in the County of Kent, and FRANK HARRY VALTER, of
Adela Cottage, Mount Street, Charlton, in the County of Kent, Electrical
Engineers, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved method of winding those sections of drum
armatures for dynamos or electro motors that consist of more than one convolution
per section, whereby a reduction of the sparking is effected.
It consists in winding the several convolutions one above the other in planes
radiating from the axis of the armature, instead of side by side circumferentially as
has hitherto been the usual practice... In an armature wound in this manner,
the difference of E.M.F. between two adjacent commutator plates is that due to
the displacement of the conductors forming a section through a distance in the
magnetic field equal to twice the thickness of a single conductor, whereas in the
existing modes of winding with the several convolutions laid side by side and, if
necessary, in superposed layers, the said difference of E.M.F. is at least that due
to the displacement through a distance equal to twice the thickness of as many
conductors as are arranged side by side in one layer, and is much greater in
superposed layers.
The winding of the armature may for the above purpose be conveniently effected
as follows.
A length of conductor sufficient to form one section of the winding having been
cut off, the middle of the length is placed at the one end of the drum, and the two
ends are led along the diametrically opposite sides of the drum to the other end,
where they are crossed over each other and then led back again along the drum, on
the top of the first wire, or in the radial plane passing through such wire, and so oD
for as many convolutions as are required for the complete section, the two ends
being brought together to one side of the drum.
The next section is then wound in a precisely similar manner close by the side of
the first section, and so on till the winding is completed. The ends of the con-
tiguous coils are brought to diametrically opposite sides of the armature drum,
and the end of one section is joined on to the opposite end of the next section but
one, the junction being taken to the commutator plate.
By the described mode of commencing the winding at the middle of the length of
wire the section finishes with both ends outside, which is a practical convenience,
but we do not limit ourselves to this arrangement.
When the number of superposed wires in one section is considerable relatively to
the diameter of the drum, small spaces may intervene between the outer parts of
the contiguous sections; in such cases suitable means are employed for supporting
such outer parts in position.
Dated this 9th day of October 1891.
ABEL & IMAX,
Agents for the Applicants.

page_text: COLELE OF DUIFICATION.
Improved Winding for Drum Armatures of Dynamos and ·
Electro Motors.
We, SIEMENS BROS. & Co. LIMITED of 12 Queen Anne's Gate Westminster
in the County of Middlesex and JOHN NEBEL, of 3 White House Villas,
Woodlands, Charlton in the County of Kent and FRANK HARRY VALTER of
Adela Cottage, Mount Street, Charlton in the County of Kent, Electrical
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 an improved method of winding those sections of drum
armaturės for dynamos or electro motors that consist of more than one convolution
per section, whereby a reduction of the sparking is effected.
the
It consists in winding the several convolutions one above the other in planes
radiating from the axis of the armature, instead of side by side circumferentially as
has hitherto been the nsual practice. In an armature wound in this manner,
difference of E.M.F. between two adjacent commutator plates is that due to the
displacement of the conductors forming a section through a distance in the magnetic
field equal to twice the thickness of a single conductor, whereas in the existing
modes of winding with the several convolutions laid side by side and, if necessary
in superposed layers, the said difference of E.M.F. is at least that due to
the displacement through a distance equal to twice the thickness of as many
conductors as are arranged side by side in one layer, and is much greater in
superposed layers.
The winding of the atmature may for the above purpose be conveniently effected
as follows:-Referring to Figs. 1, 2 and 3 of the accompanying drawings, a length
of conductor a sufficient to form one section of the winding having been cut off, the
.middle of the length is placed at the one end of the drum & as at Fig. 1 and the two
ends are led along the diametrically opposite sides of the drum to the other end,
where they are crossed over each other and then led back again along the drum on
the top of the first wire as shewn at Figs. 2 and 3, or in the radial plane passing
through such wire and so on, for as many convolutions as are required for the
complete section, the two ends being finally brought together to one side of the
drum. The next section may then be wound in a precisely similar manner close by
the side of the first section as indicated in dotted lines in Fig. 3, and so on till the
winding is completed, the end a being finally brought across the armature end so as
to be on the same side as a as shewn at Fig. 4. Instead of the next section being
wound close by the side of the first section, it may be wound in the manner described
at a position on the circumference somewhat further distant from the first section;
the order in which the sections are successively wound not being essential, and
being determined by convenience of construction. The ends of the contiguous coils
are brought to diametrically opposite sides of the armature drum, and the end of
one section is joined on to the opposite end of the next section but one, the junction
being taken to the commutator plate.
By the described mode of commencing the winding at the middle of the length of
wire the section finishes with both ends outside, which is a practical convenience.
but we do not limit ourselves to this arrangement.
.
When the number of superposed wires in one section is considerable relatively to
the diameter of the drum, small spaces may intervene between the outer parts of the
contiguous sections; in such cases suitable means are employed for supporting sucl
outer parts in position, such as by introducing small pieces of insulating material
into such spaces.

page_text: Having now particularly described and ascertained the nature of this inven<-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
In drum armatures, the method of winding the wire constituting each section
5 in convolutions one above the other so that the whole of the convolutions of each
section lie in a plane passing through the axis of the armature, substantially.
as described.
ABEL & IMRAY,
Agents for the Applicants.