United Patent Office.. 418,248, dated December 31,1889. This illustrated the
annexed drawing, which side view a
motor with diagram the circuits and de-
45 vices used the system. 401,520,1 have shown and described a
method operating alternating-current mo-
15 tops first shifting rotating theirmag-
netic poles until they had reached passed
a synchronousspeedaud thenalternatingthe
poles, or, other words,by transforming the
motor byachaňgebf circuit-connectionsfrom
ao one operated the action of. The method operating electro-mag-
. SerialHo. (Komodel.are short-circuited.ends areconnected ring E. starting; have above stated,
'the field-coils.
wire Contacts and are connected tq
brushes respectively,"through the wires /
P and contact directly connected witfy 75
brush The lever has widened end'/
which may span the contacts When in
such position and with lever contact d,
the alternating currents divide between the
two motor-coils, and reason their dif- 80
ferent self-induction difference current-
phase obtained that, starts the motor ro
tation. example, with the coils B
50 right ,angles.two more in
dependentenergizing-currents toá motorola
eratedbya single current several acting
as one.
SPECIFICATION form ing art etters aten No. '“
• The present invention specific way of
a5 carrying out the saine invention; anditcori-. New York, have
Invented certain Jiew and useful Improve
ments Methodsof Operating ElectrorMag-
nétic Motors, whichthe followingis ispeci-
io fication, inference being had to.pivoted and connected 65
insulatingcross-bar h,eo move paral
lelism. Thefield-
coils have their terminals binding-posts 60
K, and may either closeduponthemselves
or connected with source direct current
L meaUsof switch The mainorcon
trolling,switch hasfive contacts and '
two levers .
Application SledKay 30,1889.
ferént diameters.G
and coll through dead-resistance and 70
wire :Contact0 Connected,with brush F
and Bbil through self-induction-coilS and •.
Collecting springs brushes bear
upon the rings and lead the contacts a
switch,tobehereinafterdescribed.
■In patent granted.to ine April 1C
, 1889,
No.the magnetic poles
of one element until has reached synch
ronous speed and then alternating said poles
and passings directcurrentthrough the coils icc
of the other element, herein set forth.)
, all whom, concern': ,
Be known that Nikola Tesla, sub
ject Ofthe Emperotof Austria-Hungary, for
merlyof Smiljan,Lika,bordercountryofAus-
5 tria-Hungary, but nowresiding NewYork,
in the county and Slate'of.) .
When the motor has attained the desired 85
speed, the switch shifted!to the position
shown dotted lines—that say, with the
levers/ gresting onpoints ce.'rotating.420.
2. .
What claim herein invention is—
1.
N c
COMPANY, SAME PLACE. 811.connected the
linerwires from source alternating cur
rents .I
progressively shift the magnetic poles one
element field the motor alternating
purrentsdifferiňginphase passedthrough
30 independent energizing-circuits and short-
circuit the coils of-the other element. When
the motor thus started reached passes the
limit speed synchronous with the genera
tor, connect the coils previously short-
35 circuited with source direct current and
bya change the circuit-connections pro
duce simple alternation the poles. These levers are .
ELECTRO-MAGNETIC MOTOR. 90
The field-coils are thrown into circuit with
the direct-current source when the1main
switch shifted. The method operating electro -mag- 95
netic motors, which consists first progress
ively Shifting or.
One, end of'coil connects one ring, as; ■
C, anidone end coil Bconnects with ring 55
The remaining. The
motor then continues, run synchronism;
with the generator.Qontacfa is-connected-to brush. the drawing
accompanyingandformiiigapartofthe same. Thisconnects
up the two ármaturé-coils series, and the
motor will then run'as synchronous motor. (Shown, for better illustration, dif-.
The motor shown one the ordinary
forms, with field-cores either laminated or
Bolid and with cylindrical laminated arma
ture wound, for. The shaft the armature
carriesthree collecting contact rings D
E.
sists the following -m'ethpd: the start. Thereare manyspecific:
40 ally-different ways which this may car
ried out; but have séléctedonefor illustrat
ing the principle
