Improvements in the Construction of Continuous Ourrent Dynamo Armatures.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Continuous Ourrent Dynamo
Armatures.
I, LLEWELYN BIROHALL ATKINSON, % W. T. Goolden & Co. Woodfield Road
Harrow Road London, W. Civil Engineer, 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 the construction of drum wound bar
armatures in order to effect a stronger, better, insulated, and more rigid arrange-
ment of the end connections.
My invention consists in forming the end connections, by spirally building them
up with mica insulation, and effecting the fixing of the same by clamping the
whole number of collectors required for each end of the armature into one solid
structure by means of insulating rings and metal clamping or supporting rings.
The complete structure is fastened upon the shaft or upon a metal sleeve to be
fixed on the shaft, the bars being laid on the surface of the armature and jointed
to it by welding, riveting, or soldering.
And in order that my invention may be the better understood I now proceed to
describe the same in relation to the drawings hereunto annexed.
Like letters refer to like parts throughout the various figures.
Figure 1 shews in part section and part elevation the armature constructed
according to the present invention.
Figure 2 shows the complete system of end connections.
Figure 3 shows a modified construction of the commutator and end connections
combining them in one piece.
Figure 4 shows a part plan of ends of armature showing the short and long
ends of the conductors.
In figures 1 and 2, A is a radial metal piece having an extension B. parallel
to the armature axis, into this extension the spiral strip C is rivetted, soldered
and carried round to the opposite diameter of the armature.
Between the successive radial pieces A are inserted sheets of mica, and the spiral
strips C are also covered with mica held in position (if necessary) by a textile insu-
lating fabric, the strips and spirals thus insulated being held together, turned in at the
ends and fitted between insulating rings D. D. in the same manner that a commu-
tator of ordinary construction is fitted together. The end connecting pieces A. B. C
and the rings D. are mounted on the shaft or sleeve forming a solid construction,
and the bars of ordinary construction are laid upon the surface of the armature, and
jointed at the periphery to A and C. as shown in figure 2. Each alternate con-
ductor having a long end sufficient to make electrical contact with A the alternate
conductors with short ends not touching A but connected with the strip C. In
order to connect the successive bars to corresponding sections on the commutator E,
lugs Fare cast on the front end of the connecting pieces A and jointed by
soldering or screwing to the commutator E.
In figure
a construction is shown in which the commutator strip E and the
axle connecting pieces B are made in one piece doing away with the connecting
lugs F and reducing the number of insulating rings required in the construction of
the armature.
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 :-
10+
Ր L
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page_text: radial pieces and spiral strips fitted together, insulated and clamped or secured in
one structure by insulating rings and metal clamping rings, substantially as
described.
2nd. In such a system of end connections the combination of a series of radial
castings or forgings with the spiral strip connectors of flat plate, insulating and
clamping rings, the various parts being insulated from one another by mica or
equivalent material, substantially as described.
Dated this 21st day of February 1890.
FELL & WILDING,
1, Queen Victoria Street, E.C., Agents for the Applicant.