And likewise to this end the combined resistance of the generator armatures in multiple arc was kept relatively small by adjusting the number of generators operating in multiple at any time to the number of lamps then in use.
We have calculated armatures and field coils for the new dynamo with Upton, and held the stakes for Jehl and his fellows at their winding bees.
The armature, or moving part of the machine, consists in reality of eight separate armatures all constructed of corrugated sheet iron covered with asbestos and wound with wire.
These armatures are held in place by two circular iron plates, through the centre of which runs a shaft, carrying at its lower extremity a semicircular shield of fire-clay, which covers the ends of four of the armatures.
As the moving part revolves, therefore, currents of electricity are set up in the wires of the armatures and are collected by a commutator, as in an ordinary dynamo, placed on the upper end of the central shaft.
After Edison had decided this question, Upton made drawings and tables from which the real armatures were wound and connected to the commutator.
Some improvements in winding the armatures have also been accepted as valuable and adopted by other manufacturers.
He was much interested at the time in multiple telegraphy and fancied that something might come of some such arrangement of many magnetic armatures responding to the vibrations set up in one.
Volt meters and armatures for the alternating current have electro-magnets for their fields as well as for their armatures.
On each shaft are a large number of little dynamos whose armatures have various numbers of coils.
Sometimes they are coils of wire, which do not have iron cores and armatures separate to be sure--but nevertheless they have both of these united in one movable rod, and they produce magnetic fields.
The armatures are reeds and they are made to vibrate by electro-magnets.
Du Moncel also tried the difference between round armatures and flat ones, and found that a cylindrical armature was only attracted about half as strongly as a prismatic armature having the same surface when at the same distance.
Armatures are drawn in as near as can be, to close up the magnetic circuit.
Electromagnets with iron armatures in contact across their poles will retain, after the current has been cut off, a very large part of their magnetism, even if the cores be of the softest of iron.
This plan is especially desirable when the armatures of several dynamos are connected in series to obtain the line voltage.
With this separate excitation of the magnet coils, the dynamoarmatures are still connected in series with each other and the line.
Such alternators have stationary armaturesin all cases and are of either the revolving magnet or inductor type.
Revolving armatures are used in the dynamos of comparatively few transmission systems and hardly at all in those of recent date.
Of course there are other remedies for the eddy current difficulty, notably the stranding and twisting of the conductor on the armatures so as to average the position of the parts of the compound conductor.
To start the machine the balls were brought in contact, one of the paper armatures electrified, say, with positive electricity, and the disk set in motion.
From the same paper by Ewing we extract a number of results relating to permeability tests of thin sheet iron and sheet steel, such as is used in the construction of dynamo armatures and transformer cores.
In large armaturesboth bars and end rings are of rectangular cross section, the bars and rings being fastened by machine steel cap screws.
Assuming equal numbers of pole, the armatures rotate at a speed corresponding to one half the circuit frequency.
If the resistances of each of the armaturesbe negligibly small, and if there be no frictional or other losses, the power given out by the armature which serves as motor will just suffice to drive the armature which serves as generator.
In practice drum wound armaturesare used, the operation, however, is the same.
Briefly, it consists of a combination of an induction motor having a wound armature and a dynamo, the armatures being placed on the same shaft.
Hence, when the two armatures move synchronously, the torque produced by the action of the induced poles upon the field poles is always in the direction in which the motor is running, and accordingly, tends to keep it in operation.
Method of casting end rings on squirrel cage armatures of Fairbanks-Morse induction motors.
By the use of closed coil armaturesin later construction.
If both armatures be mounted on the same shaft and placed in equal fields, the combination is a ~motor dynamo~.
Where parallel operation is required between synchronous motor driven frequency changers, a mechanical adjustment is necessary between the fields or armatures of the alternator and motor to obtain equal division of the load.
Since the armaturesare identical, and as the similarly placed windings are passed through identical magnetic fields, one winding with proper connections to the slip rings and commutator will do for both.
With slotted armatures what provision must be made for retaining the inductors in position?
Armatures are most conveniently regarded from this end, the opposite end being known as the "back" end.
When two motors are used in electric railway work, their armatures are connected in series with each other and an extra resistance which prevents the passage of an excessive current through the armature before the motor starts.
This condition causes a serious defect in the action of ring armatures rendering the winding around the interior useless for the production of electromotive force.
In winding drum armatures for bipolar dynamos of two horse power or less, and especially for very small machines as used in fan or sewing machine motors, a form of winding, known as the Siemens winding, which is shown in fig.
In winding armatures there are two distinct methods employed, known respectively as lap and wave winding.
The disadvantages of slotted armatures may be stated as follows: 1.
The disadvantages of slotted armatures compared with the smooth type are: 1.
They are generally used on armatures designed to furnish a current of high voltage and low amperage.
Owing to its costly construction, it is advisable when transporting armaturesby means of cranes to use a wooden spreader, as shown in fig.
A and A' are the armatures of the two machines, the fields of which are partly separately excited, the amount of excitation current being controlled by the series compounding rheostats B and B', which form a stationary shunt.
This is composed of some twenty blind people, sixteen men and four women, and they have been taught to wind coils for armatures used in electric motors and mill machinery.
The L-shaped armatures are hung over the front edge of this block, so that their free ends lie opposite the magnet cores within the block.
When the current is removed from the line at the dispatcher's office, the armatures fall back and everything is restored to normal.
These impulses will work the armatures of both of these relays in unison.
The armatures O P are preferably mounted on the same shaft, and are adjusted relatively to one another in such manner that when the self-induction in one branch, as C, is maximum, in the other branch D it is minimum.
A half revolution of the armatures produces an opposite effect and the succeeding current impulse passes through C.
The armatures are made of thin laminae of soft iron or steel, and the amount of magnetic metal which they contain is so calculated that they will be fully or nearly saturated by the magnets.
A number of these armatures have hollow shafts, as they have been used in many ways.
The armatures are rotated in synchronism with the alternations from the source A.
Some of the armatures are shown in front on the table, Fig.
Around thearmatures are coils E F, contained, respectively, in the circuits C and D.
There are two independent fields of laminated iron joined by brass bolts; in each field is mounted an armature, both armatures being on the same shaft.
V and W are two strong permanent magnets provided with armatures V' W', respectively.
This may be done by constructing a motor with two independent sets of fields, and with either one or two armatures electrically connected, or by using two armatures and one field.
Attaching the armatures of the relays of such a line to diaphragms, as in Fig.
As soon as the ringing current ceases all of the relays release their armatures and disconnect all the bells from the line.
Two inducting armatures of tin are cemented to the interior of the cylinder, A, and occupy, each of them, about a third of its circumference.
By the mutual action between the electro-magnets and the armatures an accelerating force is obtained, which in result produces electricity greater in quantity and intensity than has heretofore been obtained by similar means.
Armatures are wound with a number of turns of wire in each coil, unless the machine is very large, and present an appearance more like Fig.
A motor and a dynamo having their armatures connected together, whereby the motor is driven by the dynamo, so as to change the current into a different voltage and amperage.
As the armatures are then held down, L knows that R has finished, so he opens his switch e, and answers R.
The regular armatures have many coils and many commutator bars, as will be seen by examining the illustrations shown.
The broad black lines of S and s represent the armatures which are directly over the electromagnets.
This makes the armatures of S and s come down with a click at the same time.
As soon as the key is raised, the armatures lift and make the up-click.
The larger sizes have three bearings, one bearing being between the two machines, while the smaller sizes have but two bearings, the two armatures being fastened to a common spider.
In Dynamotors the motor and dynamo armatures are combined in one, thus requiring a single field only.
A motor-generator is a generator driven by a motor, the two armatures being placed upon one shaft or belted together.
By tracing out the circuits it will be seen that the armatures of both are in series and that the electrodes, when they come together, form a shunt about B.
In very small motors the armatures are usually wound with sufficient resistance so that no external resistance is required.
With the electrodes separated, if current is turned on, it must pass through botharmatures in series.
He found that, when the armatures were removed from a jar, no discharge would pass between them, but when a fresh pair of armatures were supplied to the glass, the jar could be discharged.
It had been usual to employ water for the interior armatures of Leyden jars, or phials, as they were then generally called.
He found that the inner and outer armatures of his Leyden jars were oppositely electrified.
An attraction immediately takes place, and the poles and armatures are brought into contact.
An electro-magnet, A, is suspended on a hinged axis, so that the poles of the magnet have for armatures cylinders of metal fixed upon the axle of the carriage.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "armatures" in a variety of sentences. We hope that you will now be able to make sentences using this word.
