Serial No. current electro-magnetic motors invented by
me, which progressive shifting ro
tation the poles points maximum
magnetic effect produced the action of
iS the alternating currents.)
To all whom concern:
Be known that sub
ject the Emperorof Austria, from Smiljan,
Lika, border country Austria -Hungary,
5 residing New York, the county and State
of New York, have invented certain new and
useful Improvements Electro -Magnetic
Motors, which the following aspeeifica-
tion.
io This invention relates the alternating-
.
I have also constructed other forms motor
operating magnetic electric lag, which
30 not necessary describe herein detail,
although present invention applicable
thereto.nited States Patent Office.
NIKOLA TESLA, NEW YORK, Y. These motors I
have constructed great variety ways. motors which have
closed armature-coils this only approxi
mately possible, the energy manifested in
50 the armature the result inductive action
from the other element; but motors in
which the coils both armature and field
are connected with the external circuit the
result can much more perfectly obtained. The
40 power developed, however, proportionate
to the product these quantities.
As instances, have built motors with two or
more energizing-circuits, which connected
up with corresponding circuits generator
20 that the motor will energized alter-
■nating currents differing primarily phase. These results obtain using
the same amount copper ampere turns
in both elements when the cores both are
equal, approximately so, and the same cur- 75
rent energizes both; cases where the
currents one element are induced those
of the other use the induced coils an
excess copper over that the primary
element conductor. would state, however, that believe
that with the problem before him which I
have herein stated, and the solution which I
have proposed, any one skilled the art will
be able carry out and apply this invention 90
without difficulty.
ELECTRIC MOTOR. 416,194, dated December 3,1889. such motors use armature
wound with coil orcoils, which sometimes
connected with the external circuit and some-
35 times closed upon itself, and both forms
the present invention applies. This pro
duct willbe greatest whenthese quantities are
equal; hence constructing motor deter
mine the mass ofthe armature and field 'cores
45 and the windingsof both and adapt the two so
as equalize nearly possible the mag
netic quantities both., ASSIGNOR THE TESLA ELECTRIC
COMPANY, SAME PLACE. w
’ill
be understood that these results are most ad
vantageous when existing under the con
ditions presented when the'motor running 100
. 80
While know way illustrating this
invention drawing such will meet
the formal requirements application for
patent, have appended for convenience a
conventional figure motor such em- 85
ploy.
Application filed May 20,1889. (Nomodel.
In further explanation object let 55
be assumed that the energy represented in
the magnetism the field given motor
is ninety and that the armature ten. 311,418.
SPECIFICATION forming part Letters Patent No.
Generally speaking, the mass the cores
of armature and field equal, the amount
of copper ampere turns the eiiergizing-
coils both should also equal; but these 95
conditions will modified well-understood
ways different forms machine.
I have also built motors with independent
energizing-circuits ofdifferent electrical char
acter self-induction, through which have
25 passed alternating current the phases of
which were artificially distorted the greater
retarding effect one circuit over another. The
sum these quantities, which represents the
total energy expended driving the motor, 60
is one hundred; but, assuming that the motor
be constructed that the energy the field
is represented fifty and that the arma
ture fifty, the sum still one hundred;
but while the first instance the product 65
nine hundred, the second twothousand
five hundred, and the energy developed is
in proportion these products clear that
those motors are the most efficient—other
things being equal—in which the magnetic 70
energies developed the armature and field
are equal. these mo
tors the total energy supplied effect their
operation equal the sum the energies
expended the armature and the field
