Improvements in Monocyclic Electric Generators.
Year: 1896

page_text: Date of Application, 3rd Mar., 1896-Accepted, 11th Apr., 1896
COMPLETE SPECIFICATION.
Improvements in Monocyclic Electric Generators.
I JAMES DEVONSHIRE, Secretary of the British Thomson-Houston, Limited,
of 38, Parliament Street, Westminster, London (a communication from abroad
by Elihu Thomson, of Swampscott, in the State of Massachusetts, United
States of America), 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 :-
My invention relates to monocyclic generators of the type described in British
Patents of James Devonshire, dated February the 9th, 1895, Numbers 2914,
2915, 2916, 2917 and 2918; and has for its object to provide a means of altering
existing alternating current plants, so that they may be converted into monocyclic
systems, as therein set out. To this end I provide, in addition to the armature of
a generator of single phase alternating electro-motive force and mechanically
couple therewith a smaller auxiliary armature, which I call herein a
"teaser
armature, and from that armature I run the third main or main of displaced electro-
motive force so that between it and the outer mains of the system, differences of
potential and phase exist, as in the systems of distribution above referred to.
In the practice of my invention, it is of course immaterial what particular form
the auxiliary or teaser machine may take; its armature may sometimes be run in
its own separate field, separately regulated, or it may be run in the same field as
the main armature, furnishing the displaced electro-inotive force either directly or
through transformation. Other modifications will readily suggest themselves to an
electrical engineer.
The accompanying drawings show typical embodiments of my invention; therein,
Fig. 1 is a diagrammatic view, partly in section, of a generator and system of
distribution arranged according to my invention; Fig. 2 is a similar view of a
different form, and Fig. 3 is a modified form feeding the third line through
transformation.
In Fig. 1, A is the armature of a generator of the type described; B, B are its
field magnets; C, C its collecting rings, with their appropriate brushes supplying
the outside mains a, b, of an ordinary alternating current system. A is the
auxiliary or teaser arinature, having a winding upon a separate core from that of
the main armature, which is connected at N to the central point of the main
armature coil. This teaser armature, in the case illustrated, is provided with field
magnet poles corresponding in number to those of the main machine, it being
desirable and necessary to preserve the same number of cycles in the third main of
the system as in the others. C is the collecting ring for the teaser armature,
feeding the line c; E is an exciter common to both sets of field-maguets, the field
magnets B, B being in series therewith, and the field-magnets B', B' being in shunt
to the circuit through the field-magnets B, B. Separate resistances R, R regulate
the electro-motive force of the two armatures. This separate regulability is a
distinctive feature of my invention, and has peculiar advantages, inasmuch as by
it I am enabled to regulate the relative angular displacement of the phases of
the system.
In the system as thus outlined, lamps L, L are connected between the outer
mains a, b of the single phase system, operating in the ordinary way, and by the
ordinary means of regulation. At MI illustrate a monocyclic motor, preferably

page_text: of the typo described in the British Patents of James Devonshire above referred
to, which is provided with a main and auxiliary or "tenser" inducing coil and a
short-circuited armature.
Referring now to Fig. 2, I illustrate substantially the same arrangement as in
Fig. 1, except that in this case I do not have the separately regulable teaser
machine, inasmuch as the two armatures A. and A' are connected at the middle
point of the main armature A, are run in the same field, and are affixed to the
same shaft.
In Figs. 2 and 31 do not illustrate the exciter, inasmuch as it is connected in
the onlinary way in Fig. 2, and in Fig. 3 is connected as in Fig. 1.
Referring now to Fig. 3, I show how my improved connection may be applied
to the feeling of the auxiliary main e by transformation. In this case, the parts
of the single phase system are as before, but the main e is connected directly to
the central point of the main armature coil. Included in series in the main is the
eccondary S of the transformer T, the primary P of which is fed from the collecting
rings C, C of the auxiliary armature A', which in this case is connected by the
coupling O with the shaft of the main machine. Irrespective of the transformer T,
the mains, as connected in this figure, would be like the Edison threewire system
with a single phase alternator, the main e representing the neutral line of that
system. The object of the transformer T connected to the teaser armature is,
however, to displace the phases, as in the other cases already described.
In all of the figures it is to be understood that the tenser armature is rigidly
connected to the main armature in such a way as to give an electro-motive forco
of the same number of alternations, but displaced in phase; this may be accom-
plished in any convenient way, either by displacing the field magnets, or preferably
by fixing the armatures in such relation to each other as to give the desired
displacement of phase. For instance, the armatare A', occupying one position
with reference to the field poles, would be 60° in advance or behind the phase of
the innin electro-motive force.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the saine is to be performed, as communicated to me
from abrond, I declare that what I claim is:
1. In a monocyclic electric generator, a main armature generating single phase
alternating current, and auxiliary armature comprising a winding on a separate
core from the main armature, bus, mechanically connected with the main armature
and generating an electro-motive force of displaced phase, and a connection
between the teaser armature and the main armature.
2. In a monocyclic electric generator, a main armature and field magnets
generating single phase alternating electro-motive forces, a teaser arinature upon
the same shaft having a separate core from the main armature and provided with
field magnets and adapted to generate an electro-motive force of displaced phase,
and separate means of regulation for the two armatures.
3. In a monocyclic electric generator, a main armature and field magnets
generating single phase alternating current, a teaser armature mechanically
connected with the main armature and generating an electro-motive force of
displaced phase, a connection between the terminals of the main armature and two
of the mains of the system, and an inductive connection between the teaser
armature and the third main.
4. The combination of a moving dynamo-electric source of alternating single
plinse electro-motive force, with an independent supplementary dynamo-electric-
source of electro-motive force of displaced phase mechanically coupled with the
first named source and maintaining by the joint or resultant action of the two
sources electro-motive forces of displaced phase in suitable electric circuits.
5. The combination of a moving dynamo-electric machine maintaining between
a pair of mains single phase alternating electro-motive forces, with a third main
connected to the center of said source of supply, and an independent supplementary

page_text: dynamo electric source of alternating electro-motive force mechanically coupled
with the first named machine and maintaining an out of phase electro-motive force
on the third main.
For the Applicant,
J. C. CHAPMAN,
70, Chancery Lane, London, W.C., Chartered Patent Agent.