Year: 1887

page_text: Date of Application, 10th Feb., 1887
Complete Left, 7th Nov., 1887
Complete Accepted, 13th Jan., 1888
I, FRANCIS JEHL of 23 Boulevard de Strasbourg, Paris in the Republic of France,
Electrician, do hereby declare the nature of this invention to be as follows:-
My invention relates to the construction and arrangement of electrical inductors in
such a manner as to bring their coils fully under the magnetic influence of the iron
employed in them, and to commutators used in connection with inductors for effecting
the necessary alternation or intermittence of continuous electrical currents and for
restoring the alternated or intermitted currents to continuity.
In constructing an inductor according to my invention, I use soft iron in wire or
separate small plates or strips which I pile together so as to form two rings, taking
care to make such disconnections in each ring as shall prevent circulation of electrical
currents through them. I wind each ring transversely with coils of insulated wire,
and I fix the two coiled rings close to each other side by side, or the one within the
other, and I connect two diametrically opposite ends of the one coil to the primary
leads, and also two diametrically opposite ends of the other coil to the secondary leads,
taking care to connect them in such a way that, when the iron cores of the two rings.
are magnetised by an electrical current, the N pole of the one is in the closest
possible proximity to the S pole of the other. Instead of employing an inner coiled
ring, I use in some cases a cylindrical core wound lengthwise, placed within the coiled
ring, or it may be an armature of the H or Siemens form coiled lengthwise. Each
coil, instead of being continuous all round its ring or core may be divided into a
number of separate sections each connected to separate leads so that the whole
constitutes a multiple inductor. When continuous currents have to be dealt with, I
connect each coil or section of coil to a revolving commutator, so that there are two
commutators on one shaft revolving together, the one converting the primary
continuous current into a succession of alternated or intermitted currents, and the
other converting the alternated or intermitted secondary currents into a continuous
current. The inductor itself may be fixed on the shaft with the commutators, so that
all revolve together, the currents being led to and from the commutators by fixed
brushes bearing against them. Or the inductor may be stationary while the

page_text: commutators revolve, and in that case each commutator plate is connected to a ring
against which bears a brush connected with one of the inductor coils or sections of
coil. By a slight modification, the inductor consisting of the coiled iron ring having
within it the H or Siemens armature can be made available as a dynamo-electric or
electro-dynamic machine, and may be used as a motor for driving the commutators.
In this case, the coil of the armature, which is mounted free to revolve, receives the
primary continuous current or a portion of it consequently its polarity is constant ;
the ring surrounding it is wound with both the primary and the secondary coils
connected to their respective commutators, which are on the saine shaft with the
armature. On causing the armature to revolve, primary and secondary currents are
produced, or on transmitting through the apparatus a primary continuous current,
the armature is caused to revolve while at the same time the primary current is
converted by the inductor into a secondary current. The sections of coils of the
inductors may be connected either parallel or in series or in any desired groupings.
Dated this 10th day of February 1887.
ABEL & IMRAY,
Agents for the Applicant.

page_text: DI MOTIVATION.
Improvements in Electrical Inductors and Commutators therefor.
I, FRANCIS JEHL of 23 Boulevard de Strasbourg Paris in the Republic of France,
Electrician 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 the construction and arrangement of electrical inductors in
such a manner as to bring their coils fully under the magnetic influence of the iron
employed in them, and to commutators used in connection with inductors for effecting
the necessary alternation or intermittence of continuous electrical currents and for
restoring the alternated or intermitted currents to continuity.
In constructing an inductor according to my invention I use soft iron in wire or
separate small plates or strips which I pile together so as to form two rings, taking
care to make such disconnections in each ring as shall prevent circulation of
electrical currents through them. I wind each ring transversely with coils of
insulated wire, and I fix the two coiled rings close to each other side by side, or
the one within the other, and I connect two diametrically opposite ends of the one
coil to the primary leads, and also two diametrically opposite ends of the other coil,
to the secondary leads, taking care to connect them in such a way that when the iron
cores of the two rings are magnetised by an electrical current the N pole of the one
is in the closest possible proximity to the S pole of the other. Instead of employing
an inner coiled ring I use in some cases a cylindrical core wound lengthwise placed
within the coiled ring, or it may be an armature of the H or Siemens form coiled
lengthwise. Each coil, instead of being continuous all round its ring or core may be
divided into a number of separate sections each connected to separate leads so that the
whole constitutes a multiple inductor. When continuous currents have to be dealt
with, I connect each coil or section of coil to a revolving commutator, so that there
are two commutators on one shaft revolving together, the one converting the primary
continuous current into a succession of alternated or intermitted currents, and the
other converting the alternated or intermitted secondary currents into a continuous
current. The inductor itself may be fixed on the shaft with the commutators, so that
all revolve together, the currents being led to and from the commutators by fixed
brushes bearing against them. Or the inductor may be stationary while the
commutators revolve, and in that case each commutator plate is connected to a ring
against which bears a brush connected with one of the inductor coils or sections of
coil. By a slight modification the inductor consisting of the coiled iron ring having
within it the H or Siemens armature can be made available as a dynamo electric or
electro dynamic machine and may be used as a motor for driving the commutator.
In this case, the coil of the armature which is mounted free to revolve receives the
primary continuous current or a portion of it consequently its polarity is constant, the
ring surrounding it is wound with both the primary and the secondary coils connected

page_text: to their respective commutators which are on the same shaft with the armature. On
causing the armature to revolve primary and secondary currents are produced, or on
transmitting through the apparatus a primary continuous current, the armature is
caused to revolve while at the same time the primary current is converted by the
inductor into a secondary current. The sections of coils of the inductors may be
connected either parallel or in series or in any desired groupings.
The accompanying drawings illustrate the construction and winding of inductors
such as I have described and their connection through commutators to the primary
and secondary leads.
Fig. 1 is a diagram shewing the connections of the revolving commutators and
distributors and a stationary inductor C of the kind shewn in section by Fig. 2, wound
with primary and secondary coils in 12 sections. The light lines indicate the primary
wires and the dark lines indicate the secondary wires.
for
The primary wires from the central station Z are connected to the motor M and
the shaft which carries the commutator a for the primary currents and the distributing
contacts B for these numbered 1 to 12, the same shaft carrying the commutator
the secondary currents and the distributing contacts A for these numbered 1 to XII.
By adopting an arrangement such as is shewn in Fig. 1. where the commuiators and
distributors revolve the inductor being stationary, a number of inductors can be
worked, and there is no great weight revolving at high speed as there is when the
inductors themselves revolve.
The inductor C as seen in Fig. 2 consists of two iron rings superposed, each ring
being wound with the primary and secondary coils, and the N pole of each being in
juxta position with the S pole of the other.
By this construction the magnetic lines of force are all effective, and the magnetic
resistance is small as the lines of force have to cross only the space between the two
rings, instead of having to cross the whole diameter when a single ring is employed.
Instead of two rings superposed, there may be one ring outside another ring or
cylinder.
Thus as shown by Figs. 5 and 6, the one ring is inside the other, both rings wound
with primary and secondary coils, of which only one section is shew in Fig. 6. Or
as shewn by Figs. 7 and 8, the primary coils may be wound on both rings, the
secondary on only one of them.
As shewn by Figs. 9, 10, and 11, the primary coils I to XVI are wound on an
iron ring A within which is a cylinder B on which are wound the secondary coils 1
to 16. The coiled ring A fits tightly on the coiled cylinder B and both are on a
revolving shaft, the primary coils being connected to a commutator on the one side
and the secondary coils to a commutator on the other side. Obviously the primary
coils might be wound on B and the secondary coils on A, or both the primary and the
secondary coils might be wound on both A and B.
An inductor of any of the kinds described with reference to Figs. 1, 2, 5, 6, 7, 8, 9 10
and 11 may be wound with sections of primary coils only, these being connected to a
revolving distributing commutator as shewn diagraminatically in Fig. 3.
A being
the inductor C the commutator and I, I, II, II, the secondary leads. In this case the
primary current when the commutator revolves produces a counter electro motive
force in the secondary leads. There may be in one main circuit a number of such
arrangements as that shewn by Fig. 3 supplying local circuits, the currents in these
being regulated according to the speed of their distributing commutators.
Fig. 14 is a plan and Fig. 15 a front view of an alternating inductor consisting of
an iron ring B wound with primary or primary and secondary continuous coils, and
inside of it a bar magnet A wound with a portion of the coil circuit or circuits. On
the outside of the coiled ring B facing the poles of the internal magnet A are placed
semicircular pieces of iron Cembracing those parts of the coiled ring.
The distributing commutators may be of various forms. Fig. 4 shews diagraminati-
cally one form consisting of a main commutator A each bar of which is connected to
one of the insulated segment plates a on a disc B. The commutator A though shewn
separate from B is really on the same shaft with it and when both revolve together

page_text: stationary brushes 6 bearing on the segments make the intermittent contacts. In
Figs. 1 and 3 the contact segments are arranged not on the face of a disc but on the
surface of a cylinder. According to the form shewn by Fig. 13 the main
commutators A¹ B' are combined respectively with the distributing commutators A. B
the bars of the latter being made as shewn in Fig. 12 of different lengths each bar
laving two metal end parts A and B presenting themselves at the surface of the
cylinder with an intermediate piece of non-conducting material C. The inductor and
commutators may be combined with a motor for driving it as shewn, by the side view
Fig. 16 and the section Fig. 17. A is the inductor which is an iron ring wound in
sections with primary coils connected to the parts 1 to 10 of the distributor on the left
and secondary coils connected to the parts I to X of the distributor on the right, these
distributors being on the same shaft as the commutators a and b which has also on it
within the inductor ring A and H or Siemens armature B wound with coils of the
primary circuit connected through two rings 1-2 at the end of the right hand
distributor.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The construction and use of inductors consisting of two coiled iron rings in close
juxtaposition substantially as described with reference to Figs. 1. 25, 67 and 8.
2. The construction and use of a conductor consisting of a coiled ring enclosing a
coiled cylinder substantially as described with reference to Figs. 9 10. and 11.
3. The construction and use of an alternating inductor substantially as described
with reference to Figs. 14 and 15.
4. For commutating and distributing the circuits of an inductor coiled in sections,
the combination substantially as shewn in Fig. 1 of an inductor C having its primary
and secondary sectional coils connected respectively through distributors B and C to
commutators a and b, so that the inductor remains stationary while the distributor
and and coinmutators revolve.
5. The construction and use of combined distributors and commutators substantially
as described with reference to 12 and 13.
6. The combination of an inductor, distributors and commutators with a motor
armature substantially as described with reference to Figs. 16 and 17.
Dated this 7th day of November 1887.
ABEL & IMRAY,
Agents for the Applicant.