........... Pinckney,
W lla ll. ..... dynamo-electric machine, the arma
ture-core having iron disks various diame
ters, combination with inwardly -curved
end disks, for the purposes and substantially
as set forth.... There will ineachpart three groups,
each containing four coils, and the coils will
be connected follows:
Groups.... Commutator■'bars.
NIKOLA TESLA...
C
.
2...17—21
Third. mypresent
invention the wire wound upon the arma
ture two superimposed parts, and the curve
of the end disks, calculated that the
first part—thatis,practically half ofthe wire—
just fills the hollow space the line x;
or, the wire wound any other manner,
the curve such that when the whole the
wire wound the outside mass wires,w,and
the inside mass wires, w', are equal each
side the plane this case will be
25 seen the passive electrically-inactive wires
are the smallest length practicable. dynamo electric machine, arma
ture-core having inwardly -curved ends, in
combination with the armature-coils, the cross
ing wires which coils pass into the concave
heads and project equally, substantially set
forth.... 9
Third. The
shaft ITis tubular and split the end portion,
and the wires are carried through the same in
auy usual manner and connected the re
spective commutator-plates. dynamo-electric machine, the arma
ture constructed iron disks various di
ameters arranged upon the shaft such a
manner that series iron bodies formed,
each diminishing thickness from the cen
ter the periphery, substantially and for
the purposes set forth...
4.. 5
Second.. .. dynamo-electric machine, the mag
netic frame composed the cores the
curved pole-pieces and the connecting-
frame with the curved and outwardly-pro
jecting legs substantially described...
What claim is—
1..........
2. ..
60
First part wire
6S
Second part wire
First. ... armature-core
constructed the manner described may be
revolved between the poles the field-mag
nets without showing the slightest increase of
temperature.
Witnesses:
Geo.
To further equalize the armature-coils at
both sides the plates that are contact
with the brushes, the winding and connecting
up effected the following manner: The
35 whole wire wound upon the armature-core
in two superimposed parts, which are thor
oughly insulated from each other. 188G
.21— 1
In constructing the armature-core and wind
ing and connecting the coils the manner in
dicated, the passive electrically-inactive
wire reduced minimum, and the coils
at each side the plates that are contact
with the brushes are practically equal, and in
this way the electrical efficiency the ma
chine increased. The commuta
tor-plates are upon cylinder, and insu
lated, and this cylinder properly placed
and secured expanding the split end the
shaft tapering screw-ifiug, v...
. Suppose, for instance, that there are
twenty-four coils—that is,twelvein each part—
55 and consequently twenty-four commutator-
plates.....
Signed this 12th day January, A.
D...
I not claim herein the cores the field-
magnets converging toward the pole-pieces;
nor claim the method fastening the
base the lower field-magnet, this has been
claimed former application dynamo-
electric machines.. armature for dynamo-electric ma
chines, having core composed disks va
rious diameters, combination with separate
superimposed coils connected the commu
tator-plates alternate groups, substantially
as set forth.
The commutator-plates are shown out
side the bearing the armature-shaft. The first group coils the
40 first part wire being wound and connected
to the commutator-bars the usual manner,
this group insulated and the second group
wound; but the coils this second group in
stead being connected the next following
5
.
Second... dynamo-electric machine, arma
ture having separate coils superimposed and
connected the commutator-plates alter
nating groups, substantially set forth. Each of
these two parts composed three separated
groups coils. The second
group then insulated and the third group
wound, the coils this group being connected
to those bars which they would con-
50 nected the usual way. The
arrangement has further the advantage that
the total lengths the crossing wires the
two sides the plane are practically
30 equal.
5...359,743
to
15
20
ful insulation being unnecessary, elec
trical contact between several disks can only
occur places where the generated currents
are comparatively weak... The wires are then
thoroughly insulated and the second part of
wire wound and connected the same man
ner..
The end disks, which are sufficient
thickness and, for the sake cheapness, pref
erably cast-iron, are curved inwardly, as
indicated the drawings, The extent the
curve dependent the amount wire to
be wound upon the armatures..5 commutator-bars, are connected the direetly-
opposite bars the commutator.. 9—13
F irst.
