Improvements in the Cores of Armatures and Inductors for Dynamos, Magneto-machines, Motors, and other purposes.
Year: 1893

page_text: Date of Application, 16th Mar., 1893-Accepted, 29th Apr., 1893
COMPLETE SPECIFICATION.
Improvements in the Cores of Armatures and Inductors for
Dynamos, Magneto-machines, 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 of armatures for continuous, or alter-
nating current dynamo machines, magneto-electric 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 armatures, or 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, such as a ring of wire as shewn Fig. 1. and I either hammer it,
or otherwise work it into the required shape on the block or former F, as I wind it,
or when I have sufficient wire, or ribbon wound for the required purpose on a drum,
I take the whole off the drum and then compress or work it into shape over or
between moulds, or blocks, such as F, to form the cores, or so as to make the cores
of a continuous magnetic iron frame, or ring armature as seen in Fig. 2, which
is an armature of the Pacinotti type. The coils of conducting copper wire C,
Fig. 2, being wound round the iron ring between the teeth, or I make a drum
armature with projecting teeth as in Fig. 3, the electric conducting coils being
shown at C, I may supplement the iron core W, by an additional ring of iron w,
inside same as seen in Figs. 3, & 4. 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.
Fig. 4, is an armature such as is used in alternating current dynamos with pro-
jecting horns of electro magnets, W, is the iron core, and C, the conducting coils.
Fig. 5, is an H, or shuttle shaped armature core W, made of iron wire, as
described, the wire for conveying the electric current being wound as usual, in C.
Figs. 6 & 7 is an armature with crown shaped projecting teeth, or cores of
electro magnets, shaped on the face of the flat rings. The wire coils can be wound
round the two rings, or on the sides round the projecting iron cores.
I make the
armatures as in Figs. 8, and 9, for inductor cores, or of any of the shapes
shown.
I can make any desired shape with single, double, or multiple armatures,
and any number of projecting horns or teeth, for any description of dynamo
or motor.
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 may fix the magnetic cores shaped, or moulded as described in a frame to bind
them together, and keep them in the proper shape and position, and also make
supports for the armature cores, as may be necessary, and I may use shaped
laminated iron rings, or pieces for a like purpose, arranged so as to form a box, or
clamp to hold the iron wire cores 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

page_text: 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 armature frame. I may also use
steel wires for armatures of magneto electric machines, or a combination of iron
and steel wire to render the whole magnetic.
I propose to use my iron cores made as described for alternating current dynamos,
or alternating current motors, for which I specially propose to use them, or for the
armatures of continuous current dynamos, and motors, or for electro-magnetic
armature cores for telegraph instruments or any like purpose, or use.
The special advantages of my construction as described are:-
(a) An almost perfect lamination of the iron 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 armature core.
(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 armatures for magneto machines, dynamos,
and motors, being easily made.
I am aware that ring armatures such as are used on the Gramme, Burgin, or
Heinrich dynamos have been made of iron wire and I do not claim such con-
struction.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I de are that what I
claim is
(1) The method of manufacture of armatures and armature cores moulded and
worked into shape upon or between a former or formers, consisting of iron wire,
strips, woven or twisted bands substantially as described.
(2) In dynamo or magneto electric machines or motors, for use with continuous
or alternating currents, armature cores and inductors moulded and worked into
shape out of iron wire, strips, tape, or woven or twisted bands of iron to form
Pacinotti toothed armature cores, drum shaped toothed cores, electro-magnetic
projecting cores, H, or shuttle shaped cores, crown toothed or side projecting cores,
or other like shaped cores and magneto inductors substantially as described.
(3) In the armatures of dynamo electric machines or motors the combination
with cores 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.
(4) In armatures for dynamo or magneto-electric machines, or motors the com-
bination with cores 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 16th day of March 1893.
וגו
זוIYIW
NATA
TARK
תזות
TATTET
FR
CIS JOEL.