Year: 1887

page_text: Date of Application, 2nd May, 1887
Complete Left, 31st Jan., 1888
Complete Accepted, 16th Mar., 1888
We ROOKES EVELYN BELL CROMPTON Engineer & WILLIAM AUGUSTUS KYLE
Engineer both of the Are Works Chelmsford Essex England, do hereby declare the
nature of this invention to be as follows:-
Our invention relates to improved methods of coupling the bars, strips or wires,
forming the conducting circuit of the armatures of dynamo machines. It relates more
particularly to an improved method of connecting these bars across the ends of
armatures having cores of solid cylinder or drum type. Hereafter we use the word bars
to designate that portion of the armature conductor which lies on the external periphery
of the core, in a direction parallel, or nearly parallel to its axis. Heretofore the difficulty
met with in satisfactorily arranging the coupling of these bars across the ends of the
drum, has been that the bars and connections first put on to the core at the time of con-
struction, cannot be removed for examination or repair without the removal of the
whole or of some of those put on afterwards; and the object of our invention is to
remedy this defect, and to provide a means of connecting these bars, so that any one
of them, or any coupling piece connecting their ends can be removed without
interfering with any other bar or coupling piece.
One of our methods for doing this is to connect the ends of each pair of bars
requiring to be connected, by means of a peculiarly shaped connecting piece which
we hereafter call a coupler. This coupler is formed of copper or other suitablo
material and consists of a flat strip cut so as to be cranked in one plane and curved in
the other plane, the cranking and curvature being such that the desired number of bars
can be coupled by these couplers, the longitudinal space occupied being not greater
than the width of one coupler. We sometimes divide these couplers at a convenient
point so that they can be withdrawn in two pieces & we connect them to the bars by
screw, dovetail or other mechanical connection, soldered or unsoldered as we find con-
venient. In order to provide for the separate withdrawal of the longitudinal bars,
we arrange the couplers, so that when in position they can be built up into a ring, the
inner edge of which has a slightly greater radius than the outer edge of the circle of
bars themselves; thus the ends of the couplers can be attached to the outer edge of
the bars, & when any one bar is released from its coupler, it can be drawn longitu-
dinally. We prefer to curve the couplers in such manner that they can be built into

page_text: the ring form above described & each coupler can be withdrawn from its position, along
its own curved path without interfering with any of the others. In some cases we
form the parts of the couplers of thin sheet copper, so that they may be flexible & in
this case it is not necessary to pay such close attention to the curved form, as each
piece being flexible can be withdrawn, even when the path through which it is with-
drawn does not form a regular curve.
We sometimes form the surface of that portion of the coupler to which the bars are
attached of the same curvature as the remainder of the coupler which thus facilitates
its withdrawal along the curved path described. The insulation between the flat
surface of the couplers themselves, may consist of strips of inica of suitable material
& the insulation at right angles to the axis at or near the cranked portion of the
couplers, may consist of discs or sheets of mica, or of mica combined with vulcanized
fibre celluloid or other suitable material. We sometimes use cold soldering amalgams
wherever the parts have been coupled by screw or dovetail connections, & where the
heating for soldering purposes is not an easy matter. It will be noticed that the ring
of couplers as heretofore described must necessarily be of greater exterior diameter
than that of the ring of bars themselves; consequently the two ends or beads of the
armature being of greater diameter than the rest, the armature cannot be withdrawn
end ways from the bored tunnel within the pole pieces of the field magnets. To meet
this difficulty we sometimes crank the ends of the longitudinal bars inwards; although
to provide for the separate withdrawal of the parts we prefer the arrangement of the
couplers in a ring larger than the general diameter of the armature, yet in certain
cases, we can arrange them so that they form a ring smaller, or of the same diameter
as the armature itself.
We sometimes divide the interpolar cavity or tunnel at its centre line so that the
upper half of the field magnets can be lifted off & in the case where the magnets are
of the single horse shoe form, we can make the lower half of the pole piece of cast
iron, so designed that it not only makes contacts with the upper wrought iron half at
the middle line of the armature, but the cast iron is prolonged upwards, so as to clasp
& make good contact with a portion of the exterior surface of the wrought iron magnet
arms.
1
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page_text: COMPLETE SPECIFICATION.
Improvements in Dynamo-electric Machines and Motors.
We ROOKES EVELYN BELL CROMPTON, Engineer, and WILLIAM AUGUSTUS KYLE,
Engineer, both of the Arc Works, Chelmsford, Essex, England 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 improvements relate to the field magnets and armatures of dynamo electric
machines for use as generators or motors.
Our improvements relate first to the field magnets.
According to our invention the field magnets are made of what we call the single
limb type i.e. there is a single horse shoe. The machine is arranged vertically with
the armature below, and the limbs of the magnets are made of wrought iron, but the
pole pieces for the lower side of the armature are made of cast iron, or of separate
blocks of wrought iron, and these are so joined to the wrought iron field magnets, that
the field magnets can be detached, and removed bodily to allow the armature to be
inspected. The wrought iron and cast iron portions are so connected that there is a
large surface of contact between them, and so that the induction is never too great in
the cast iron.
Figure 1 of the drawings shews an end view of the lower part of a single magnet.-
a, a are the wrought iron legs. b, bare cast iron pole pieces.
Figure 2 is a side elevation of the same.
Figure 3 shews an end view of the lower part of a single magnet machine for
mounting on a bed plate such as used in connection with high-speed engines for direct
driving. ce are the legs of the magnets, and d d are wrought iron pole pieces. They
are held together by the gun metal or other non magnetic brackets ee which also
support the magnets of the machine.
Figure 4 is a side view of the same.
A similar arrangement is applicable when the machine is inverted so that the
armature is above. The armature is then easily accessible, the pole pieces being
removed, whereas in the former case the magnets are removed.
Our invention also refers to dynamo electric machines with what are known as
drum armatures. At present drum armatures are so constructed that they are very
difficult to repair, as any one turn or end connector cannot be removed without taking
much of the armature to pieces.
According to our invention the end connections are not made as is at present
usual, within the circumference of the armature, but are outside, so as to be easily
detachable.
Figures 5 and 6 of the drawings show diagrammatically an armature wound with
12 conductors g¹, g. These are connected externally by connectors h, j, i only one
connector and pair of conductors being lettered for simplicity of reference. Each
connector is made up of a strip h in one layer and a crosspiece j and a second strip į
in the other layer. The connectors may thus resemble those in common use except
in that the coupling is all outside the circumference of the armature.

page_text: We do not confine ourselves to the particular arrangement of coupling shewn in
the drawings Figures 5 to 8 this portion of the invention being for the arrange-
ment of the coupling outside the circumference of the armature, affording readier
accessibility and facility for separation of the parts.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a dynamo electric machine, pole pieces constructed with capability of detach-
ment from the magnets to admit of easy access to the armature without removal of
the armature substantially as described.
2. In a dynamo electric machine having a drum armature, and connectors applied
tbereto externally of the circumference of the armature.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London,
Agents for the Applicants