This invention improvement alter
nating-current motors, and has for its general
object produce single-circuit alternating-
current torque-motor economical and sim-
15 pie construction. side elevation more practica
ble and efficient embodiment the inven
tion.nited States Patent Office. Let consider now the magnetic
conditions existing this core any point,
as near the center, and any other
point, as' nearer the surface. this means secure a
similar result that which have heretofore
attained other forms types motor in
which means one more alternating
currents have produced rotation pro- 65
gression the magnetic poles points of
maximum attraction the field force.
It wellknown that magnetic core, even
if laminated subdivided, wound with an
20 insulated coil and current electricity di
rected through the coil the magnetization of
the entire core does not immediately ensue,
the magnetizing effect not being exhibited in
all parts simultaneously.
Referring Fig.
If the core thin small mass, this effect
maybe inappreciable; but the case a
35 thick core, even comparatively thin
one, the number alternation rate of
change the current strength very
great the time interval occurring between the
manifestations magnetism the interior
40 the core and those parts adjacent the
coil more marked, and the construction
of such apparatus motors which are de
signed run alternating equivalent
currents—such pulsating undulating
45 currents generally—I have found desirable
and even necessary give due consideration
to this phenomenon and make special pro
visions order obviate its consequences.
principle the mode operation, which 70
have above described general terms.
NIKOLA TESLA, NEW YORK, Y. Serial No.
Figure side elevation such motor. (Nomodel.
In the drawingslhaveshown asimpleform
of motor, which will serve demonstrate the . This attribute to
25 the fact that the action the current to
energize first those lamime parts the
core nearest the surface and adjacent the
exciting-coil, and from thence the action pro
gresses toward the interior.
Surrounding this core coil which So
connected with source rapidly-varying
currents. certain inter-
30 val time therefore elapses between the
manifestation magnetism the external
and the internal sections layers the core. central vertical section 75
the same the plane the axis rotation.
The specific object present invention is
50 take advantage this action effect, and
by rendering more pronounced utilize it
in the operation motors general. let represent large
iron core, which may composed num
ber sheets laminae soft iron steel.
ELECTRO-MAGNETIC MOTOR. How
ever, the magnetization increases, b
becomes also affected, reaching finally its
maximum strength some time later than 95
Upon the weakening the current the mag
netization first diminishes, while still
exhibits its maximum strength; but the con
tinued weakening attended sub
sequent weakening Assuming the cur- 100
.
Application filedApril 4,1890.
The nature the invention will under
stood from the following statement.
SPECIFICATION forming part Letters Patent No. When cur- 85
rent-impulse started the magnetizing-
coilY, the section part being close to
the coil, immediately energized, while the
section part which, use conven
ient expression, protected” the inter- go
veiling sections layers between and 6,
does not once exhibit its magnetism. Fig.)
To whom concern:
Be known that sub
ject the Emperor Austria-Iinngary, from
Smiljan, Lika, border country Austria-
5 Hungary, residing New York, the county
and State New York, have invented certain
new and useful Improvements Electro-Mag
netic Motors,of which the followingis specifi
cation, reference being had the drawings ac-
io companying and forming part the same. 346,603.
Fig. This
object attain constructing field-magnet
in which the parts the core cores that
exhibit different intervals time the mag- 55
netic effect imparted them alternating
or equivalent currents energizing coil
or coils are placed with relation*to rotat
ing armature exert thereon their attract
ive effect successively the order their 60
magnetization., ASSIGNOR THE TESLA ELECTRIC
COMPANY, SAME PLACE. 433,703, dated August 5,1890
