Improvements in the Cores of Electro Magnets for Motors and other purposes.
Year: 1892

page_text: Date of Application, 7th May, 1892
Complete Specification Left, 6th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Cores of Electro Magnets for Motors and
other purposes.
I, HENRY FRANCIS JOEL of 44 Lavender Grove, Dalston London, E. in the
County of Middlesex Electrical Engineer do hereby declare the nature of this
invention to be as follows:-
My invention consists in making the cores of electro magnets for motors and
other purposes of soft iron wire, or of thin iron ribbon, or tape. I first coil the
iron wire, or ribbon in many turns and layers, on a former, block, or drum into a
convenient arrangement and form as to thickness, breadth, and length, and I either
hammer it, or otherwise work it into the required shape on the former as I wind it,
or when I have sufficient wire, or ribbon wound for the required purpose I take the
whole off the block, or drum and then compress, or work it into shape over, or
between moulds so as to make the field cores and poles of my motor-I coat the
layers of iron wire, or ribbon with an insulating varnish or cement, so as to insulate
the turns one from the other, and also to set the wires together when compressed
into shape.
To make a continuous magnetic frame, I make a flat ring of the iron wires, or
ribbon and shape it into such a frame, having a circular opening in the centre for
the armature, and projecting horns on the poles, and otherwise as an ordinary
shaped field magnet frame. To make a horse shoe shaped core and poles
I compress the ring upon itself to make a U shaped magnetic core and also shape
it to make projecting horns and circular shaped poles for the armature.
any desired shape with single, double or multiple poles.
I can make
For some purposes I cover the iron wires, or the ribbons, with cotton before
winding it upon the former, this has the advantage of insulating the coils, the one
from the other and also of allowing the insulating varnish, such as shellac varnish, to
bind them more effectually together. I also propose to use strands of iron wires
either round, or flat shaped like a ribbon or tape, for building up my magnetic cores
as described.
I may fix the magnet cores and poles, shaped, or moulded as described, in a
frame to bind them together and keep them in their proper shape and position, and
also to make bearings for the armature and supporting feet as may be necessary,
and I may use shaped iron pieces, in conjunction with a ring or other shaped wire
or ribbon frame, to form the polar extensions, or I may use laminated thin sheet
iron plates at the ends, bolted together, so as to enclose the wires, or arranged so
as to form a box to hold them in position. I also propose to use wire to bind the
shaped cores, or clamps to keep them together, without the use of the insulating
varnish, or cement. I may combine two or more such frames, side by side, or end
to end, to make any special form of magnetic frame. I may also use steel wire, or
plates in conjunction with the soft iron to render the whole magnetic.
I propose to use my electro magnetic iron cores made as described, for alternating
current dynamos, or alternating current motors for which I specially propose to use
them, or for the frames of continuous current dynamos and motors, or for electro
magnet cores for telegraph instruments, or any
like purpose or use.
Dated this 7th day of May 1892.

page_text: 4
COMPLETE SPECIFICATION.
Improvements in the Cores of Electro Magnets for Motors and
other purposes.
I, HENRY FRANCIS JOEL of 44 Lavender Grove Dalston London E. in the
County of Middlesex, Electrical Engineer 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 consists in making the cores and poles, or frames of electro
magnets for dynamo machines, motors, and other purposes, of shaped coils of soft
iron wire, or of thin iron ribbon, or tape. The drawings illustrating the invention
are outline, or diagram drawings.
The frames shown in the figures may be made of any useful size as is well
understood. I first coil the iron wire or ribbon, see Fig. 1. W. in many turns
and layers on a former, block, or drum into a convenient arrangement and form
as to thickness breadth and length and I either hammer it or otherwise work
it into the required shape on the former as I wind it, or when I have sufficient
wire, or ribbon wound for the required purpose, I take the whole off the block F,
Fig. 1 or drum, and then compress, or work it into shape over, or between
moulds F, to form cores, or poles, or so as to make the cores and poles of a
complete and continuous magnetic iron frame of my dynamo, or motor Fig. 2;
the moulds being removed after the frame is formed. I coat the layers of iron
wire, or ribbon with an insulating varnish, or cement so as to insulate the turns
one from the other and also to set the wires together when compressed into shape.
To make a continuous magnetic frame I make a flat ring of the iron wire, or
ribbons Fig. 1. W. and shape it into such a frame having a circular opening in the
centre for the armature and projecting horns on the poles and otherwise as an
ordinary shaped field magnet frame. To make a horse shoe shaped core and poles,
I compress the ring upon itself to make a U shaped magnetic core and also shape
it to make projecting horns and circular shaped poles for the armature.
make any desired shape with single, double, or multiple poles such as Fig. 5 a four
pole dynamo, or motor frame, or Fig. 6, a two pole enclosed frame. Fig. 6 is also
specially adapted for the cores of alternating current convertors, or transformers.
For some purposes I cover the iron wire W. with cotton before winding it upon
the former, this has the advantage of insulating the coils one from the other and
also of allowing the insulating varnish such as shellac varnish, to bind them more
effectually together. I also propose to use strands of iron wires either round or
flat shaped like a ribbon, or tape, for building up my magnetic cores as described.
I can
I may fix the magnetic cores and poles shaped or moulded as described, in a
frame Fig. 7, to bind them together, and keep them in their proper shape and
position, and also to make bearings B, for the armature and supporting feet S, as
may be necessary; and I may use shaped iron pieces such as A. Fig. 7. in
conjunction with a ring or other shaped wire, or ribbon frame, to form the polar
extensions; and the frame R may be the former or mould upon which the wire, or
tape is wound and shaped; or I may use laminated thin sheet iron plates A. Fig. 8.
at the ends bolted together by bolts C, C, Figs. 7, and 8, so as to enclose the wires,
and retaining pins or bolts c, arranged so as to form a box to hold them in position,
I also propose to use wire to bind the shaped coils, or clamps to keep them together
without the use of the insulating varnish or cement. I may combine two or more
such frames, side by side or end to end, to make any special form of magnetic
frame. I may also use steel wire, or plates such as A, Fig. 7, in conjunction with
the soft iron to render the whole magnetic.
The conducting copper wire coils are wound upon the cores or polar extensions
as shewn in Figs. 5, 6, and 7, at M, M, M, to form a complete electro magnet, or
field oil.

page_text: I propose to use my electro-magnetic iron cores made as described for alternating
current dynamos, or alternating current motors for which I specially propose to
use them, or for the frames of continuous current dynamos, and motors, or for
electro magnetic cores for telegraph instruments or any like purpose, or use, such
as alternating current arc lamps.
The special advantages of my construction as described are :—―
(a) An almost perfect lamination of the iron poles and cores and avoidance of
eddy currents.
(b) Insulation of the iron laminations specially applicable for alternating current
motors.
(c) The decreased cost of manufacture of the complete magnetic frame.
(d) Owing to the greater magnetic efficiency of the finely divided, or laminated
iron the weight for a given power is less than with solid iron.
(e) It admits of specially designed dynamos and motors being easily made.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
(1) The method of manufacture of cores, and poles, moulded upon a former, and
consisting of iron wire strips, woven, or twisted bands, substantially as herein
described.
(2) In dynamo electric machines or motors, cores or poles moulded out of iron
wire, strips, tape, or woven or twisted bands of iron, substantially as described.
(3) In dynamo electric machines, or motors, cores and poles moulded out of iron
wire strips tape woven or twisted bands of iron, to form a complete magnetic frame
for the said machine, or motor, substantially as described.
(4) In dynamo electric machines, or motors, the combination with cores or poles
moulded out of iron wire, strips, tape or woven or twisted bands of iron, of laminated
iron plates and bolts to form a supported frame, substantially as described.
(5) In dynamo electric machines, or motors, the combination with cores or poles
moulded out of iron wire strips, tape, or woven or twisted bands of iron, of steel
wire, tape or plates, associated therewith to render the whole permanently magnetic,
substantially as described.
Dated this Sixth day of February 1893.