Apparatus for Controlling Electric Motor Generators at a Distance.
Year: 1897

page_text: Date of Application, 15th May, 1897
Complete Specification Left, 14th Feb., 1898-Accepted, 9th Apr., 1898
PROVISIONAL SPECIFICATION.
Apparatus for Controlling Electric Motor Generators at a Distance.
We, SIEMENS BROTHERS & Co. LIMITED, of 12, Queen Anne's Gate, West-
minster, S.W., Electrical Engineers, and PAUL TRAUGOTT JULIUS ESTLER, of
Fairfield House, Old Charlton, Kent, Electrical Engineer, do hereby declare the
nature of this invention to be as follows:-
This invention relates to means of controlling from a central or generating
station, motor, generators situated at a distance.
For this purpose, the primary conductor from the central station, besides being
connected to the armature windings of the motor is connected also to a few coils
on the field magnet so that, on switching on the current, the motor is started
working the generator.
The generated current exciting the field magnet is at first cut off from the
distributing circuit by a switch, but traverses the coils of a solenoid the core of
which is jointed to one arm of a lever, having its other arm connected by a
jointed rod to an eccentric on the shaft of the motor generator.
The jointed rod carries a pawl which is at first clear of the teeth of a ratchet
segment, but, when the secondary current attains sufficient tension, the solenoid
attracts its core and thereby moves the jointed rod into such a position that its
pawl which is caused to reciprocate by the accentric, engages the ratchet segment
and moves it step by step until an arm moved by it makes a contact by which
The
the distributing circuit is switched in, the solenoid coil being cut out.
contact arm is held by the catch of an automatic cut out which, in case of
abnormal increase of current, releases the catch and thereupon the switch arm
is disengaged and the distributing circuit is opened. When the field magnet
is sufficiently excited by the secondary current, it attracts an armature in
opposition to a weight or spring, moving a contact arm by which the field
windings in the circuit of the primary are short circuited leaving the primary
current to flow through the armature of the motor, but when the motor generator
is switched out of circuit at the central station, this contact arm being no longer
held by the attraction of the field magnet is moved by the weight or spring so
as to break the contact, the arrangement then being such that the whole primary
current can traverse the field magnet coils when the switch at the generating
station is again operated.
1511
11907

page_text: Apparatus for Controlling Electric Motor Generators at a Distance.
We, SIEMENS BROTHERS & Co. LIMITED, of 12, Queen Anne's Gate, West-
minster, S.W., Electrical Engineers, and PAUL TRAUGOTT JULIUS ESTLER, of
Fairfield House, Old Charlton, Kent, Electrical Engineer, do hereby declare the
nature of this invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:--
This invention relates to means of controlling from a central or generating
station, motor, generators situated at a distance.
For this purpose, we arrange certain connections at the distant station "><s
we shall describe referring to the accompanying diagram. It is to be understood
that the primary conductor from the central station besides being connected to
the armature windings of the distant motor is connected also to a few coils on its
field, magnet so that, on switching on the current, the motor is started working
the generator.
The generated current which excites the field magnet of the motor generator
and which traverses the line G is at first cut off from the distributing circuit L
by an open switch f but passes by a contact at s and line p to the coils of a
solnoid the core of which is jointed at q to one arm of a bell crank lever pivotted
at m and having an adjustable counterweight g; its other arm is connected at n
to a jointed rod linked to an eccentric on the shaft a of the motor generator.
On the jointed rod are projecting teeth b which are at first clear of the teeth of a
ratchet segment c on the axis of which is fixed a contact arm d. When the
generated current attains sufficient tension, the solenoid h attracts its core and
thereby moves the point n to the right so that the teeth on the jointed rod,
while the rod is caused to reciprocate by the eccentric at a, engage the teeth of
the ratchet segment c and moves the segment step by step until the arm d makes
contact at by which the distributing circuit L is switched in the solenoid
coil being cut out by the breaking of the contact at S.
The contact arm d, is held by a catch on the armature e of an automatic cut
out which in case of the current to L falling to a predetermined minimum releases
the catch and thereupon the switch arm d is withdrawn by a spring or weight,
the distributing circuit being opened and the arm & making contact with s ready
for again starting the motor. When the field magnet is sufficiently excited by
the generated current, it attracts an armature y pivotted at a in opposition to a
weight or it might be a spring, thus making a contact of w by which those of
the windings of the field magnet which are in the circuit of the primary current are
short circuited, leaving the primary current to flow only through the armature
of the motor, but when the motor generator is switched out of circuit at the
central station, the armature y being no longer held by the attraction of the
field magnet is moved by the weight or spring so as to break the short circuiting
contact of w tor so that the whole primary current can traverse the few field
magnet coils above referred to, when the switch at the generating station is
again operated, to bring the motor generator into circuit.
Having now particularly described and ascertained the nature of this' inven-
tion and in what manner the same is to be performed, we declare that what
we claim is:-.
1. In apparatus for controlling motor generators at a distance the combination
of an excentric on the armature shaft its rod with teeth adapted to be thrown
into gear with a ratchet segment by a lever when moved by the core of a solenoid

page_text: in circuit with the generator, a contact arm on the axis of the ratchet segment
and contact for the distributing circuit, arranged and operating substantially
as described.
2. In combination with several primary coils on the field magnet of a motor
generator, a short circuiting contact made by an armature attracted to the field
magnet where it is excited by the generated current substantially as and for the
purpose set forth.
ABEL & IMRAY,
Agents for the Applicant.