Apparatus for Indicating at a Distance the Speed and Direction of Rotation of Machinery.
Year: 1894

page_text: Date of Application, 5th Nov., 1894
Complete Specification Left, 25th July, 1895-Accepted, 7th Sept., 1895
PROVISIONAL SPECIFICATION.
Apparatus for Indicating at a Distance the Speed and Direction of
Rotation of Machinery.
We EUGENE DUCRETET and LEON LEJEUNE, both of No. 75 Rue Claude
Bernard, Paris, France do hereby declare the nature of this invention to be as
follows:-
Our invention relates to an apparatus for indicating at a distance the speed of
machinery, the action of which is based on the employment of polyphase electrical
currents obtained either by means of a dynamo or by means of a magneto electric
machine. The said currents can also be produced by means of any other
suitable source of electrical energy, suitably converted by means of a revolving
commutator.
The armature of the machine (whether it be dynamo or magneto electric) is
wound so as to produce polyphase currents, and the shaft of the armature is
connected directly through a pulley and band or other gear with the shaft of
which the speed is to be indicated, or the current generating machine might be
directly connected to the said shaft.
We will describe our invention as arranged for example with a magneto electric
generator, as shewn on the accompanying drawing in which M is the magneto
electric current generator, the armature shaft of which is driven by a pulley and
belt r from the shaft the speed of which is to be indicated, and R is the receiver of
the polyphase currents generated, combined with the indicator. This apparatus
consists of a fixed ring A of any suitable form on which is wound the conducting
wire through which the currents from the generator M are made to flow, the
windings of the ring being suitably connected with the posts to which the
conductors from the generator are attached. The ring may be variously con-
structed in detail; the annular core may also be magnetic or it may be replaced
by an arrangement of electromagnets.
The motion imparted to the armature shaft of the current generating machine
from the shaft the speed of which is to be measured, causes a revolving magnetic
field to be produced, the speed and intensity of which are a function of the speed
of rotation of the generator, and consequently also a function of the speed to be
measured.
Centrally within the ring and within the revolving magnetic field are one or
more metal plates, either magnetic or of a good conductor of electricity, which
plates are mounted on an axis. Under the action of the revolving magnetic field,
which action is a function of the speed and intensity of the said field and
consequently of the speed to be measured, the said plates and axis tend to assume
a rotary motion which is counteracted by a spiral spring S; there is consequently
established between the two forces a state of equilibrium in which a certain
angular deviation of the plates and axis corresponds to a certain speed to be
measured. Thus it will be seen that if there be fixed upon the axis of the said
plates a pointer moving over a fixed circular scale or graduated dial, the varying
angular positions assumed by the pointer will correspond to varying speeds of the
shaft the speed of which is to be indicated, and consequently by suitably graduating
the scale or dial, the pointer will be made to indicate the speed of the said shaft
for the time being.

page_text: The pointer being capable of turning in both directions, it can be made to
indicate the speed of motion in either direction.
For indicating speed in either direction there may also be employed two separate
receiving rings A with their plates, axis and pointer, so that by suitably reversing
the order of connections of the conducting wires, the one pointer will serve to
indicate, the speed in one direction and the other the speed in the other direction.
Thus if at the zero point a stop be provided, the one pointer will be held at zero
while the other indicates the speed in the corresponding direction.
Dated this 5th day of November 1894.
ABEL & IMKAI,
Agents for the Applicants.
Apparatus for Indicating at a Distance the Speed and Direction of
Rotation of Machinery.
We, EUGENE DUCRETET and LEON LEJEUNE, both of No. 75 Rue Claude
Bernard, Paris, France, 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 :-
Our invention relates to an apparatus for indicating at a distance the speed and
direction of rotation of any machine, the action of the apparatus being based on
the employment of polyphase electrical currents obtained either by means of a
dynamo or by means of a magneto electric machine. The said currents can also
be produced by means of any other suitable source of electrical energy, suitably
converted by means of a revolving commutator.
The armature of the machine (whether it be dynamo or magneto electric) is
wound, or the commutator is arranged so as to produce polyphase currents, tripbase
in the case shewn in the accompanying drawings, and the shaft of the armature or
commutator is connected directly through a pulley and band or other gear with the
shaft of which the speed is to be indicated.
We shall describe our invention as arranged for example with a magneto electric
generator, as shewn on the accompanying drawing in which M is the magneto
electric current generator, the armature shaft of which is driven by a pulley and
belt from the shaft the speed of which is to be indicated. R the receiver consists
of a fixed ring A of any suitable form on which is wound the conducting wire
through which the currents from the generator M are made to flow, the windings
of the ring being suitably connected with the posts to which the conductors from
the generator are attached. The ring may be variously constructed in detail the
coil being wound on an annular core may be magnetic or made without magnetic
metal.
For the ring might be substituted a system of electromagnets intended to
produce the revolving magnetic field.
The motion imparted to the armature shaft of the current generating machine
from the shaft the speed of which is to be measured, causes to be produced in the
ring a revolving magnetic field the speed and intensity of which are functions of
the speed of rotation of the generator, and consequently of the speed to be
measured.
Centrally within the ring and within the revolving magnetic field are one or
more metal plates, either magnetic or of good conductors of electricity, which
plates are mounted ou an axis. Instead of plates a conducting cylinder C
concentric with the ring is shewn in the drawing. Under the action of the
revolving magnetic field, which action is a function of the speed and intensity of
the said field and consequently of the speed to be measured, the said plates.or the

page_text: cylinder and their axis tend to assume a rotary motion which is counteracted by a
spiral or other suitable spring S; there is consequently established between the
two forces a state of equilibrium in which a certain angular deviation of the axis
corresponds to a certain speed measured. Thus it will be seen that if there be
fixed upon this axis a pointer moving over a fixed circular scale or graduated dial,
the varying angular positions assumed by the pointer will correspond to varying
speeds of the shaft the speed of which is to be indicated, and consequently by
suitably graduating the scale or dial, the pointer will be made to indicate the speed
of the said shaft for the time being.
The pointer being capable of turning in both directions it can be made to
indicate the speed of motion in either direction.
For indicating speed in either direction there are employed two separate
receiving rings with connections such that the magnetic field revolves in the one
direction for one of the rings and in the opposite direction for the other ring.
If then each ring be provided with a cylinder C or its equivalent, with dial and
pointer, one of the dials may be considered to indicate speed forward, the other to
indicate speed backwards, each pointer meeting a suitable stop which holds it at
zero when the other pointer is indicating some speed. The indication of direction
may however be effected more simply by applying to the axis of C a double spring
capable of resisting in both directions of rotation, and devoting half the dial to
indication of forward and half to indication of backward speed.
A single generator may serve for a number of receivers so that the speed can be
indicated at a number of localities. For this purpose the three conductors a b c
are led from the generator to connecting posts above the receiver to work it, and
from connecting posts below to the next receiver in succession, when desired. Or.
from the generator there might be separate sets each of
conductors to the
separate receivers.
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 :-
The application as herein described of polyphase electric currents for indicating
speed and direction of rotation.
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ABEL & IMRAY,
Agents for the Applicants.