NIKOLA TESLA, NEW YORK, Y. 3is 65
a central cross-section the same, the arma
ture being shown mainly elevation. the disk,
however, where these conditions are not pres
ent, the poles points greatest attraction
are line right angles the plane 95
the coils; hence there will torque estab
lished this angular displacement the
poles magnetic lines, which starts the disk
in rotation, the magnetic lines the armature
and field tending toward position paral- 100
.
SPECIFICATION forming part Letters Patent No. (Som
odel.nited States Patent Office. 295,745. Serial N
o.
ELECTRO-MAGNETIC MOTOR.
Let designate two plates built of
thin sections laminae soft iron insulated
more less from one another and held to- 70
gether bolts any other suitable means
and secured base The inner faces of
these plates contain recesses grooves in
which coil coils are secured obliquely to
the direction the laminations. present in-
45 vention, however, the torque, instead being
solely the result time difference the
magnetic periods phases the poles at
tractive parts whatever cause due, pro
duced angular displacement the
50 parts which, though movable with respect to
one another, are magnetized simultaneously,
or approximately so, the same currents.
ApplicationfiledJanuary 1889. Fig.)
To all whom concern:
Be known that Nikola Tesla, from
Smiljan, Lika, border country Austria-
Hungary, subject the Emperor Aus-
5 tria, residing New York, the county and
State New York, have invented certain
new and useful Improvements Electro-
Magnetic Motors, which the following a
specification, reference being had the draw-
io ings accompanying and forming part the
same.
This principle operation have embodied
practically motor which obtain the
necessary angular displacement between the 55
points greatest magnetic attraction the
two elements the motor—the armature and
field—by the direction the lamination the
magnetic cores said elements, and the best
means accomplishing this result which 60
I present aware have shown the
accompanying drawings. the firstclass motors the torque
is due the magnetism established dif-
35 ferent portions the motor currents from
the same from independent sources, and
exhibiting time differences phase., ASSIGNOR THE TESLA ELECTRIC
COMPANY, SAME PLACE. The poles thus es
tablished would naturally lie the same line
at right angles the coils but the plates
A they are deflected reason the diree- 90
tion the laminations and appear near
the extremities said plates.
In order define more clearly the relations
which the motor forming the subject my
present application bears others the
rs class which pertains, will recapitulate
briefly the forms alternating-current mo
tors invented and described more in
detail prior patents and applications. the
second class the torque results from the en
ergizing effects current upon parts of
40 the motor which differ-in magnetic suscepti
bility—in otherwords, parts which respond to
the same relative degree the action a
current, not simultaneously, but after dif
ferent intervals time.
Such device when acted upon alter- 80
nating current capable ofrotation and con
stitutes motor, the operation which ex
plain the following manner: current or
current-impulse traversing the coils tends
to magnetize the cores and all 85
which are within the influence the mag
netic field the coils. 2
is end edge view the same.
Of these there are two principal types or
2o forms: first, those containing two more en
ergizing-circuits through which are caused to
jrnss alternating currents differing from one
another phase extent sufficient to
produce continuous progression shifting
25 the poles points greatest magnetic ef
fect, obedience which the movable ele
ment the motor maintained rotation;
second, those containing poles parts dif
ferent magnetic susceptibility, which under
30 the energizing influence ofthe same currentor
two currents coinciding phase will exhibit
differences their magnetic periods or
phases. 405,858, dated June 25, 1889.
Figure side view the motor with a
portion its armature-core exposed. Fig. Within 75
the coils disk preferably composed
of spirally-wound iron wire ribbon a
series concentric rings and mounted a
shaft having bearings the plates A
