Improvements in or relating to Armatures for Dynamo Electric Machinery.
Year: 1896

page_text: Date of Application, 22nd Dec., 1896
Complete Specification Left, 22nd Sept., 1897-Accepted, 13th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Armatures for Dynamo Electric
Machinery.
We, P. R. JACKSON & Co. LTD., and JOSEPH SLATER LEWIS, both of Salford
Rolling Mills, Manchester, in the County of Lancaster, Engineers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to armatures for dynamo electric machinery and in
particular to those of the kind known as "Sayers" armatures.
According to our invention we provide improved means for connecting the ends
of the bars or armature conductors so as to form armature coils, and in particular
we provide an improved method of connecting one armature bar to another bar
some distance apart without unduly lengthening the armature.
In some types of machine the armature conductors cach consist of two bars
side by side which at the end of the armature remote from the commutator require
to be connected to two similar bars. Each pair of bars is twisted and bent round
so that the ends of one pair lie upon the ends of the second pair, we then,
according to our invention, place between the pairs of ends a plate of copper large
enough to cover both ends and secure said ends and plate tightly together by
means of bolts. The plate acts to maintain the bars of each pair in contact with
each other and the bolts connects said bars to the plate and to the respective bars
of the other pair thus making a very solid and secure joint. The joints may be
sweated with solder if desired.
We have found it advisable in some instances to form the armature conductors
of three bars, the middle one of each being adapted to act as a wedge and maintain
the other two bars firmly in the slots in the armature core. With such conductors
we connect the ends to the cross connectors at the ends of the armature in the
manner following, that is to say, the middle bar is reduced in thickness at its end
and at or near the end of the cross connector an opening is provided to receive
the end of the middle bar. The said ends of the middle bar and cross connector
are then clamped between the two side bars which with the middle bar forms the
armature conductor and all four ends are secured together by bolts being also
soldered if desired.
Our improved method of connecting one bar on an armature to another bar which
is displaced an angular distance round the armature is as follows:-The bars
are made of different lengths placed alternately round the armature in the usual
manner, and we so arrange that every pair of bars which require connection shall
consist of a long bar and a short bar. The connection between the bars is made
by a copper strip somewhat of a Z-shape which is connected at one end to the end
of a long bar and which then passes circumferentially round the armature for
half the distance, at which place it proceeds in a longitudinal direction and then
turns circumferentially again until it reaches the short bar to the end of which
it is to be connected. This method of connection is especially useful in the
Sayers
case where the supplementary armature conductors of a
"armature are
to be connected, since in this case the end of the armature is already occupied
by the spiral connectors which in a somewhat similar manner connect the ordinary

page_text: armature conductors which lie within the supplementary conductors. The method
is, however, also applicable for use with ordinary armatures for cross-connecting
the conductors.
Dated this 22nd day of December 1896
W. P. THOMPSON & Co.
322, High Holborn, London, W.C., Patent Agents for the Applicants.
L
Improvements in or relating to Armatures for Dynamo Electric
Machinery.
We, P. R. JACKSON & Co. LTD., and JOSEPH SLATER LEWIS, both of Salford
Rolling Mills; "Manchester, in the County' of Lancaster, "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:-
Our invention relates to armatures for dynamo electric machinery and in par-
ticular to those of the kind known as " Sayers" armatures.
According to our invention we provide improved means for connecting the ends
of the bars or armature conductors so as to form armature coils, and we further
provide an improved method of connecting one armature bar to another bar at a
distance along the periphery of the armature without unduly lengthening the
armature.
In order that our invention may be clearly understood we will now proceed to
describe the same with reference to the accompanying drawings, in which:-
Figures 1 and 2 are views at right angles to each other illustrating our method
of connecting together the ends of armature conductors each of which conductors
consists of two bars or strips.
Figure 3 is a section perpendicular to the armature shaft of a small portion of
the periphery of 'a slotted armature in which each armature conductor is formed
of three bars.
',
Figures 4 and 5 are views at right angles showing the method we adopt for
attaching a cross connector to an armature conductor such as shown in Figure 3.
Figure 6 is a section on the line 6-6, Figure 4.
Figure 7 is a plan, and
Figure 8 is an end elevation of a portion of the development of the periphery
of an armature provided with our improved means for connecting one armature
bar to a second bar at a distance along the periphery.
Referring now to Figures l'and 2, A A' are bars forming one armature conductor
and B B are similar bars' forming another armature conductor 'which it is required
to connect with the first named conductor. Each bar at the point where it leaves
'the armature is twisted and bent round so that the ends of the one pair of bars
forming one conductor are in the same plane and lie upon the ends of the 'bars
forming the second conductor as shown. According to our invention we insert
between the pairs of ends a plate C of copper which plate is large enough to cover
both ends of a pair of bars and the ends of the bars and the plate are then secured
together by four or a suitable number of bolts D. The plate C acts to maintain
the bars of each pair in contact with each other and the bolts connect said bars to
the plate and to the respective bars of the other pair thus making a very solid
and secure joint. The joint may be sweated with solder if desired.
Referring now to Figures 3 to 6 we find, it advisable in some instances when
the armature conductors are each formed of three bars which are inserted in the
same slot in an armature core to make the middle, bar somewhat wedge shaped in

page_text: cross section so that it maintains the other two bars firmly in position in the slot.
In Figure 3 E denotes the armature core which is slotted at E', FF being the
two outer bars and F the wedge shaped inner bar of the armature conductor.
Our method of attaching such armature conductors to the cross connectors at the
end of the armature is clearly shown in Figures 4 to 6 and is as follows:-
The middle bar is shorter than the outer bar, and is also reduced in thickness
at its end as shown at Fs Figures 5 and 6. The cross connector G is recessed as
shown at G¹ so as to receive the end of the middle bar of the armature con-
ductor. The ends of the middle bar and cross connector are then clamped between
the two side bars and all four ends are secured together by bolts H being also
soldered if desired.
Referring now to Figures 7 and 8. E is an armature core which is provided
with slots E to receive the armature conductors. Said conductors are made of
different lengths placed alternately round the armature in the usual manner and
we so arrange that every pair of bars which require connection shall consist of a
long bar and a short bar. In Figure 7 for example the long bar J is required to
be connected to the front bar J while the long bar J is to be connected to the
front bar which is located in the slot next but one after the short bar J. In
order to avoid complication we have illustrated a small portion only of the peri-
phery of the armature, it will be understood however that the method of connecting
the bars and the shape of the end connector is the same throughout the entire
periphery. In the drawing the connector which connects the bar J with the
bar J is indicated at K. Said connector which as abovementioned is similar to
all the other connectors is somewhat of a Z-shape and is secured at one end to the
bar J as shown at K¹ and at its other end to the bar J1 as shown at K. By
making the connectors of the shape shown we are enabled to pass one connector
over another in a very small space for example in starting from the point K³ the
connector K will pass outside the long bar J3 which is located in the slot next to
the short bar J1 and then partially covering the end of the short bar J turns in
a longitudinal direction, then after turning again proceeds outside the long bar Ja
at the extreme end thereof direct to the point I'. The connector L which is
connected at L' to the short bar J in a similar manner passes outside the long
bar J2 and then over the end of the short bar J the second portion of the con-
nector K and outside the end of the long bar J. It will be seen therefore that one
portion of each connector will be covered by a similar portion of another connector
said portions being those at the end of which the long bars are attached. This
method of connection is especially useful for joining the ends of supplementary
armature conductors of a Sayers armature as in this case the end of the armature
is already occupied by the spiral connectors which in a somewhat similar manner
connect the ordinary armature conductors. We do not however confine ourselves
to such use as our improved method is applicable for use with ordinary armatures
for cross connecting the conductors.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
In a dynamo electric machine the method of connecting armature conductors
substantially as described with reference to Figures 1 and 2 or to Figures 4 to 6
or to Figures 7 and 8 of the accompanying drawings.
Dated th: 00
1007
W. P. THOMPSON Co.
LL
322, High Holborn, London, W.C., Patent Agents for the Applicants.