Improvements in Armatures for Electric Generators or Motors.
Year: 1896

page_text: Date of Application, 18th Apr., 1896-Accepted, 30th May, 1896
COMPLETE SPECIFICATION.
Improvements in Armatures for Electric Generators or Motors.
We, SIEMENS BROTHERS & Co. LIMITED, and EDWARD FRIEDRICH
HEINRICH HERMANN LAUCKERT of 12 Queen Anne's Gate, Westminster, in
the County of London, Electrical Engineers, do hereby declare the nature of
this invention and in what manner the same is to be performed to be parti-
cularly described and ascertained in and by the following statement :-
This invention relates to the armatures of electric generators or motors and
especially to the arrangement of the conducting bars thereon and their connec-
tions in such a manner as to provide for complete conductive union of the parts
that have to be electrically connected without interfering with the insulation of
the parts which have to be kept electrically separate.
Fig. 1 of the accompanying drawings is a part longitudinal section and Fig. 2 is
a part trausverse section of an armature with its bars and connections arranged
according to this invention, and Fig. 3 is a perspective view of the connections at
both ends of a set of four bars on the one side to the corresponding set of four bars
on the other side of the armature.
The periphery of the armature is divided as usual into a number of sections each
having a trough-like lining F of insulating material and containing a number of
inner bars G each having an insulating coating. On these bars is placed another
trough-like lining H of insulating material and an equal number of outer bars K
each having an insulating coating. The inner bars G are arranged in pairs the
one C of each pair being on the one side of the armature longer than the other D,
so that the ends of the bar C project beyond those of D.
In like manner the outer bars K are arranged in pairs the one A of each pair on
the one side of the armature being longer than the other B so that the ends of A
project beyond those of B but both A and B are longer than C and D.
On the other side of the armature the bars are similarly made of different
lengths, the ends of the one bar of each pair projecting beyond those of the
other bar of the pair.
This projection of the alternate ends admits of the connections being soldered to
each successively without mutual interference.
Thus the connection d can first be soldered to D, then c to C, afterwards b can be
soldered to B and a to A.
At the left end of the armature the connection a from the outer bar A has an
intermediate part a a' connecting it integrally to a' which is soldered to the shorter
inner bar A¹.
The connection b from the other outer bar B has an intermediate part bb'
connecting it integrally to 6' which is soldered to the longer inner bar B¹.
By similar connections c, c c, c¹ and d, d d', d' the inner bars C and D are
connected to the outer bars C' and D' respectively.
At the right end of the armature, the connecting of the bars is similarly
effected but the intermediate parts a a¹ b b, c c and d d' of the connections are
all equal.
The connec-
The projecting ends of the long outer bars A on the one side and C on the
other are soldered to the insulated plates P of the commutator.
tions a b c d, a d¹ are all coated with insulating material and placed in
position together, and fixed in any suitable known manner on the armature shaft,
from which they are insulated.

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 :-
1. An armature for an electric generator or motor having the sections of its
periphery filled with two layers of conducting bars arranged in pairs the outer
pair being both longer than either of the inner pair and the one of each pair
longer than the other, each outer bar on the one side connected to an inner
bar on the other side, and the longer bar of each outer pair being connected to
a plate of the commutator, substantially as and for the purposes set forth.
2. The construction and arrangement of the connection of the bars on the one
side to the bars on the other side of the armature, substantially as described
with reference to Fig. 3.
Dated this 18th day of April 1896.
ABEL & IMRAY,
Agents for the Applicants.