Improvements in Conductors for Armatures of Dynamo Electric Machines.
Year: 1888

page_text: Date of Application. 5th Sept., 1888
Complete Specification Left, 4th June, 1889-Accepted, 13th July, 1889
PROVISIONAL SPECIFICATION.
Improvements in Conductors for Armatures of Dynamo Electric
Machines.
I FREDERIK VILHELM ANDERSEN of No. 23 Regency Street Westminster S. W.
Electrician, do hereby declare the nature of this invention to be as follows:-
In armatures of dynamo electric machines constructed to carry large currents,
great difficulty is experienced in keeping the temperature down when working.
The large conductors required to carry such currents become heated through "eddy"
currents developed by reason of their moving in a magnetic field. These "eddy."
currents also diminish the general efficiency of the machine.
In order to obviate these disadvantages, according to this invention I make that
part of the conductor through which the magnetic lines pass on entering and leaving
the armature core, of a considerable number of copper strips or lengths of copper
tape which are laid together so as to form one straight conductor and are soldered
to each other at the two ends of the compound conductor thus formed while they
are left free for the greater part of their length. I provide a longitudinal slot or
opening at each end of the compound conductor to receive the connecting con-
ductor to be used when "winding" the armature, by inserting a plug of metal.
between the strips or tapes when they are laid together and shaping them round.
the plug so as to leave an opening of the required size and shape. In order to
avoid any objectionable swelling of the conductor, I reduce the thickness of the
strips or tapes at each end sufficiently to overcome the unevenness which would
otherwise ensue. .
Although good efficiency is obtained by waking up a compound conductor of this
description without inserting any insulating substance between the individual strips of
which each conductor is composed, I ordinarily provide such insulation by varnishing
all the strips on one side; I sometimes introduce insulating tapes between the con-
ducting strips or make use of any other suitable process for obtaining the required
degree of internal insulation.
In "winding" an armature these compound conductors are employed on the outside
of the core, while ordinary single or stranded conductors of any suitable form are used
for the remaining parts of the total circuit; connections being made with the com-
pound conductors at their ends where they are soldered together and furnished with a
slot or opening as above described for the purpose of allowing of an efficient joint
being made.
The conductors when made up are insulated on the outside and fastened to the
armature in such a manner that the individual strips stand edgewise on the core; i.e., so
that the magnetic lines will pass through the compound conductor parallel to the
broad side of the strips.
:
1000
COMPLETE SPECIFICATION.
Improvements in Conductors for Armatures of Dynamo Electric
Machines. .
1 FREDERIK VILHELM. ANDERSEN, of No. 23 Regency Street, Westminster, S.W.
Electrician, do hereby declare the nature of this invention and in what manner the
[Price 8d.]

page_text: same is to be performed, to be particularly described and ascertained in and by the
following statement:-
In armatures of dynamo electric machines constructed to carry large currents great
difficulty is experienced in keeping the temperature down when working. The large
conductors required to carry such currents become heated through "eddy" currents
developed by reason of their moving in a magnetic field. These "eddy" currents
also diminish the general efficiency of the machine.
The object of this invention is to obviate these disadvantages by a novel construction
of and manner of fixing such conductors.
In the accompanying drawing, which shows the construction of conductors made
according to my invention,
Figure 1 is a side elevation.
Figures 2 and 4 are a plan of parts of a conductor arranged for making connection
with the commutator which joins at the end marked C.
Figure 3 is a plan of part of a conductor arranged for joining to a cross connection
and end of armature.
Figures 5 and 7 represent on a reduced scale the complete conductors of which
figures 2 and 4 show parts, and
Figure 6 shows a similarly reduced representation of the conductor shown in part
in figure 3.
According to my invention I make that part of the conductor through which the
magnetic lines of force pass on entering and leaving the armature core of a con-
siderable number of metal strips or lengths of metallic tape T which are laid
together so as to form one straight conductor and are soldered to each other at
convenient points J while they are left free for the greater part of their length.
I provide à longitudinal slot or opening O at each end of the compound conductor to
receive the connecting conductor to be used when "winding" the armature; this is
effected by inserting between the strips or tapes when they are laid together a
plug of metal around which they are shaped thus leaving an opening of the required
size and form. . In order to avoid any objectionable swelling of the conductor where
the slots or openings are provided, I reduce the thickness of the strips or tapes at
those points as shown at K by rolling or other convenient method sufficiently to
overcome the unevenness which would otherwise ensue.
Although good efficiency is obtained by making up a compound conductor of this
description without inserting any insulating substance between the individual strips
of which each conductor is composed, I ordinarily provide such insulation by
varnishing all the strips on one side; I sometimes introduce insulating tapes between
the conducting strips or make use of any other suitable process for obtaining the
required degree of internal insulation.
"
In " winding an armature these compound conductors are employed on the
outside of the core while ordinary single or stranded conductors of any suitable form
are used for the remaining parts of the total circuit. Connections are made with
the compound conductors at the points where they are soldered together and where
they are furnished with the slot or opening as above described which allows of an
effective joint being made.
The conductors when made up are insulated on the outside and are attached to the
armature in such a manner that the individual strips. stand edgewise on the core ;-
that is so that the magnetic lines of force will pass through the compound conductor
parallel to the broad. side of the strips or tapes of which it is composed.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
Conductors for armatures of dynamo electric machines composed of a number of
metallic strips or tapes soldered together at convenient points but left free for the
greater part of their length, and with or without insulating substances between them

page_text: and longitudinal slots and openings within them, such conductors being attached
to the armature so that the individual strips of which each conductor is composed
stand edgewise on the core, substantially as and for the purposes hereinbefore
described.
DL: L 1
T
1000
A. F. SPOONER,
Agent for the Applicant.