For
instance, the length the armature-core 65
twelve inches, and suitable construction
the sameissubdivided electrically,sothatthere
areinthegenerating direction six inchesofiron
and six inches intervening air-spaces in
sulating material, the currents will reduced 70
to fifty per cent.)
U
i
To all whom may concern:
Be known that ola esla, Smil-
jan Lika, border country Austria-Hungary,
have invented certain Improvements Dy-
■ namo-Electric Machines, which the follow
ing specification,
i The main objects invention are in-
j crease the efficiency the machine and fa-
i cilitate and cheapen the construction the
j same; and this end invention relates to
; the magnetic frame and the armature, and to
other features construct-ion,hereinafterinore
| fully explained.
DYNAMO-ELECTRIC MACHINE. diagram illustrating the coils the
armature and the connectionsto (lie coinmn-
| tator-plates. 359,748, dated March 22, 1887.220,370. side
view, the magnetic frame.
i invention illustrated the accompa-
j nying drawings, w
rhich Figure longi-
| tndinal section, and Fig.
The cores cof the field-magnets may be
25 tapering both directions, shown, for the
purposes concentrating the magnetism upon
the middle the pole-pieces.
The iron disks may insulated or
coated with some insulating-paint, very care-
I
.
The connecting-frame the field-mag
nets the form indicated the side view,
30 Fig. lionewed December 1,18SG, Serial o. cross-section, the
! machine. the lower part being provided with the
spreading curved cast legs that the ma
chine will rest firmly upon two base-bars, r. (No model. a
2c section the shaft aud commutator- bars. top view, and Fig.
Fig. Bysubdividing the iron coreelectric
ally this direction the generation these
currents can reduced great extent.
As shown the drawings, the armature is
constructed thin iron disks ,of vari
ous diameters, fastened upon the armature-
sliaft suitable manner and arranged ac- 75
cording their sizes, that series iron
bodies, formed, each which dimin
ishes thickness from the center toward the
periphery. Fig.
I the lower pole, the field-magnet M
is fastened, preferably means Babbitt or
35 other fusible diamagnetic material, the Xiase
:j which, provided with bearings for the
j armature-shaft The base has projec
tion, which supports the brush-holders and
!
j the regulating devices, which may any
I ordinary character, may such shown
: application like elate herewith,
j The armature constructed with the view
I reduce minimum the loss power due
j the transversal Foucault currents and to
45 the change polarity, aud also shorten as
much possible the length the inaclive
wire wound upon the armature-core.
The armature -core being constructed as
shown, will easily seen that those por
tions the armature that are the most remote
from the axis, and where the currents are 85
principally developed, the length iron in
the generating direction only small frac
tion the total length the armature-core,
and besides this the iron body subdivided
in the generating direction, and therefore the 90
Foucault currents are greatly reduced.
A pplication filed January 14, 1Č8G.
SPECIFICATION forming part etters Patent No.
It well known that when the armature is
revolved between the poles the field-mag
nets currents are generated iii the iron body 50
of the armature which develop heat, and con
sequently cause waste power. Owing to
the mutual action the lines force, the mag
netic properties iron, and the speed the
different portions the armatnre-core, these 55
currents are generated principally and near
the surface the armature-core, diminishing
in strength gradually toward the center the
core. consequence
of the subdivision the iron the armature
and the increased surface for radiation the 95
risk heating lessened. Fig. An
other cause heating the shifting the
poles the armature-core. both ends the armature the
inwardly-curved disks preferably cast- 80
iron, are fastened the armature-shaft.e
NIKOLA TESLA, SMILJAN LIKA, AITS'LLIATI UXGARY, ASSIGNOR THE
TESLA ELECTRIC LIGHT AND MANUFACTURING COMPANY, RAHWAY,
NEW JERSEY. end
j view the commutator-bars, and Fig. Their quantity under same conditions
proportional the length the iron body 60
the direction which these currents are gen
erated
