I have found that the field-magnet the
motor strongly energized its coils B
25 and the circuits through the armature-coils
closed, assuming the generator running
at certain speed, the motor will not start;
but the field but slightly energized in
general such condition that the magnetic
30 influence the armature preponderates in
determining its magnetic condition the motor
will start and, with sufficient current, will
reach its maximum normal speed.
It characteristic this motor that its di-
15 rection rotation not reversed revers
ing the direction the current through its
field-coils, for the direction rotation de
pends not upon the polarity the field, but
upon the direction which the poles the
2:, armature are shifted. 50
I have other applications shown how the
construction these similar motors may
be varied certain well-known ways—as, for
instance, rotating the field about station
ary armature rotating conductors within 55
the field; but not illustrate these features
further herein, with the illustration which
I have given regard the rest within the
power person skilled the art con
struct. requires
the simplest type generator for its opera
tion, and when properly constructed shows a
high efficiency.
NIKOLA TESLA
Witnesses:
Frank Murphy,
Frank Hartley. 60
The present form motor cheap, simple,
reliable, and easy maintain.
.
What claim is— 70
The combination, with motor having in
dependent energizing armature circuits, of
an alternating-current generator with corre
sponding induced circuits connected with the
motor for effecting progressive shifting 75
the poles the motor armature, and source
of continuous current for energizing the field
of said motor, set forth. Motors
constructed aud operated this principle
maintain almost absolutely the same speed for
all loads within their normal working-limits; 45
and practice have observed that the
motor overloaded sneh extent to
check its speed the speed the generator, if
its motive power not too great, dimin
ished synchronously with that the motor. 63
I not claim herein the method trans
mitting power which this system involves,
having made the subject another appli
cation for patent. reverse the motor,
the connections either tire circuits g'
must reversed. I
have found, however, the fields both the
generator and motor strongly energized
40 that starting the generator starts the motor,
and that the speed the motor increased
in synchronism with the generator. The action the
generator,by causing progressive shifting of
the poles the motor-armature,sets the
5 latter rotation opposite direction that
in which the poles move. For this
reason desirable keep the start and
35 until the motor has attained its normal speed,
or nearly so, the field-circuit open per
mit but little current pass through it.381,969
2
The operation this system will under
stood from the foregoing. If, now, the continu
ous current directed through the field coils,
so strongly energize the magnet A,the
speed the motor, which depends upon that
ro the generator, will not increased, but the
power which produces its rotation will in
creased proportion the energy supplied
through the coils B
