SPECIFICATION forming part Letters Patent No. (N
om
odel.
Each coil surrounded magnetic
shield which preferably composed 90
annealed, insulated, oxidized iron wire
wrapped orwound the coils the manner
indicated, forma closed magnetic
circuit around the coils and between the same
and the magnetic cores Between the pole 95
pieces cores mounted the armature
K, which, usual this type machines,
is wound with coils closed upon themselves.
Figure view motor, partly sec- 75
tion, with, diagram illustrating the inven
tion.States Patent Office. desirable,
however, for the economical working such
motors that the strength attraction one
set magnets should maximum the
35 time when that the other set minimum
and conversely; but these conditions have not
heretofore been realized except cases where
the two currents have been obtained from in
dependent sources the same different
40 machines.
The nature and operation the invention
will more fully explained reference to
the accompanying drawings. The cores forming the other set, are
energized coils and the coils are con- 85
nected, preferably, series with one another,
in two derived branched circuits re
spectively, from suitable source current.
In Fig. rents, currents rapidly-varying strength
20 kindred nature. similar view modifica
tion the same.
The object the present invention to
establish conditions morenearly approaching
the theoretical requirements perfectwork
ing, or, other words, produce artificially
45 difference magnetic phase means of
a current from single primary source suffi
cient extent meet the requirements of
practical and economical working.
ALTERNATING-CURRENT ELECTRO-MAGNETIC MOTOR.345,388.)
To dll whom mcoy concern:
Be known that Nikola Tesla, sub
ject the Emperor ofAustria-Hungary, from
Smiljan, Lika, border country Austria-
5 Hungary, residing NewYork, the county
and State New York, have invented certain
new and useful Improvements Alternating-
Current Electro -Magnetic Motors, which
the followingis specification,referencebeing
ic had the drawings accompanying and form
ing part the same.
ApplicationfiledM
arch26,1890. The magnets one set pro
tect certain extent from the energizing 55
action the current means magnetic
shield screen interposed between the mag
net and its energizing-coil.
NIKOLA TESLA, NEW YORK, Y.
The operation resulting from this disposition
is follows: current impulse di- 100
. Fig. SerialN
o. This
interval difference phase between the
30 two sets magnets, when artificially pro
duced, limited extent. 433,700, dated August 1890. This shield is
properly adapted the conditions particu
lar cases, shield protect the main 60
core from magnetization until has become
itself saturated and longer capable con
taining all the lines force produced the
current., ASSIGNOR THE TESLA ELECTRIC
COMPANY, SAME PLACE.
In carrying out invention employ a
50 motor with two sets energizing field
magnets, each wound with coils connected
with source alternating rapidly-vary
ing currents, but forming two separate paths
or circuits. this means will seen that
the energizing action begins the protected 65
set magnets certain arbitrarily-deter
mined period time later than the other,
and that this means alone conjunc
tion with other means devices heretofore
employed practically-economical difference 70
of magnetic phase may readily secured.
The improvements subject this applica
tion are more particularly applicable that
class motors which two more sets of
energizing-magnets are employed, and in
25 which artificial means certain interval
of time madeto elapse between the respect
ive maximum minimum periods phases
of their magnetic attraction effect. which exhibits the simplest form
of the invention, the field-magnet 80
motor, having, say, eight poles inwardly-
projecting cores and The cores form
oneset magnets and are energized coils
D.
This invention improvement that
class electro-magnetic motors which the
rotation produced the progressive move-
15 ment effect the maximum magnetic
points poles produced the conjoint ac
tion effect two energizing circuits
through which are passed alternating cur-
