Joubert's method, which has been perfected by many observers, consists in attaching to the shaft of the alternator a contact which closes a circuit at an assigned instant during the phase.
If, however, hard carbons are used, the alternating-current arc deforms the shape of the alternator electromotive force curve; the carbon P.
Blondel in 1896 came to the conclusion that with the same alternator we can produce carbon P.
The essential difference between an alternator and a dynamo is that the alternator delivers alternating current to the external circuit while the dynamo delivers direct current.
A characteristic feature is that in the dynamo the field magnet is the stationary part and the armature the rotating part, while in the alternator the reverse conditions usually obtain.
An elementary alternator is shown at the left to illustrate the application of the sine curve to the alternating current cycle.
In the station at Lausanne four of the motors to which the transmission line is connected each drives a 3,000-volt three-phase alternator for the distribution of light and power.
The prevailing type of alternatorfor transmission work is that with internal revolving magnets and external stationary armature.
As more commonly constructed the magnet winding of the inductor alternator consists of only one or two very large coils, which are in some cases as much as ten feet in diameter.
The possibility of making an alternator excite itself like a series machine, by putting a condenser on it, was pointed out.
Perry said it would seem possible to obtain energy from an alternator without exciting the magnets independently, the field being altogether due to the armature currents.
A Gramme alternator was coupled to the low pressure coil of a transformer, and a hot wire voltmeter put across the primary circuit.
A badly designed alternator might show very fair regulation on non-inductive load and yet be unable to give full voltage on inductive load.
Multi-polar revolving armaturealternator with whole coil winding shown in radially developed diagram to clearly indicate the path of the winding.
Each slip ring is provided with a double type brush holder, making it possible to clean brushes while the alternator is in service, by simply removing one brush at a time.
The mid point of the windings of the two phases may be united in the alternator at a common junction.
The reasons for the type being displaced by other forms of alternator are chiefly because only half as great a pressure is obtained by a flux of given amount, as would be obtained in the ordinary type of machine.
Because of the small number of coils in a turbine alternator as compared with a slow speed machine of the same kva.
The alternator is styled slow speed although connected to a high speed engine, because what is considered high engine speed is slow speed for alternator operation.
How must an alternatorbe constructed to generate two phase current?
In order to admit of the prompt replacement of damaged coils, sufficient space is usually provided between the alternator bearings to allow ample movement of the armature to permit of ready access to both armature and field coils.
A multiphase or polyphase alternator is one which delivers two or more alternating currents differing in phase by a definite amount.
This pressure is combined with the main pressure of the alternator by transformers, so as to give suitable phase relations for operating induction motors.
The coils of thealternator armature are connected, as shown, to two main leads and to a teazer wire.
V volts, is connected to F and G, the effect is the same as if a much stronger alternator is connected between F and P.
Then they said that the hiddenalternator in the output circuit was mu times as strong as the actual alternator which was applied between the grid and the filament.
In the case of a turbo-alternator the steadiness obtainable in the electrical load may determine the frequency of readings taken, both electrical and otherwise.
This type of alternator has an unbalanced armature reaction which is the cause of considerable flux variation in the field pole tips and in fact throughout the field structure.
The three phase alternator A, is driven by the water wheel B, and furnishes current at say 2,200 volts plus sufficient pressure to compensate for line drop.
By using a high pressure alternator in order to considerably increase the transmission voltage.
The current is transmitted at the alternator voltage 2¾ miles over the single circuit pole line.
This current now being limited by the high resistance, the arc is easily extinguished at the end of the first one-half cycle of the alternator wave.
Ordinarily and for lines of moderate length, current is sent out direct from the alternator to the line and transformed by step down transformers at the points of application.
It is often impracticable, without the installation of new exciters, to raise the alternator voltage by a further increase of the exciting voltage and current.
It is probable that normal voltage could be obtained only with difficulty, unless the alternator was especially designed for low power factor service.
In a constant current series system, upon what does the voltage at the alternator depend?
The appearance of the armature of a typical three-phase alternator is illustrated in fig.
The general idea of the polyphase alternator giving two or more E.
The machine on which Joubert carried out his experiments was a Siemens disk alternator having no iron in its armature, and it was found that the curve of E.
S polar projections similar to the N poles, a second set of armature coils may be arranged opposite to them, and we obtain an inductor alternatorwith double armature.
Thus as compared with thealternator not only is there no division of the winding into separate phases, but the form-factor k' disappears, since the effective and average E.
The fundamental "electromotive-force equation" of the heteropolar alternator can now be given a more definite form.
The only advantage of the polyphase machine as thus used is that the whole of the surface of the armature core may be efficiently covered with winding, and the output of the alternator for a given size be thereby increased.
Although separate excitation is the more usual method, the alternator can also be made self-exciting if a part or the whole of the alternating current is "rectified," and thus converted into a direct current.
In the steam-line casing of the alternator the rotary spark gap, alternator, potential transformer, condenser and oscillation transformer are self-contained.
Usually the alternatoris mounted on the underside of the fuselage where the propeller spends its force in the form of an air stream.
Bedded down upon solid rock there was a high-tension alternator capable of absorbing the entire output of the mighty turbine.
Their larder was full, the receptor was finished, and the beam transmitter was almost ready to attach to the turbo-alternator before the calm was broken.
A rotary spark gap run at the same speed as the alternator which supplies the power transformer.
A panel located near the center of the board between alternator panels and feeder panels carries standard instruments used for convenient calibration of the alternator and feeder instruments.
The alternatorswitches are provided also with automatic overload and reversed current relays, and the feeder switches, as above mentioned, are provided with automatic overload relays.
Every alternator switch, every selector switch, every group switch, and every feeder switch upon the main floor is here represented by a small switch.
From alternators to bus bars the current passes, first, through the alternator switch, and then alternatively through one or the other of two selector switches which are connected, respectively, to the two sets of bus bars.
For the alternator panels, instruments of the vertical edgewise type are used.
In the illustration the alternator panels are shown at the left and the feeder panels at the right.
Two complete and independent sets of bus bars are used, and the connections are such that each alternator and each feeder may be connected to either of these sets of bus bars at the will of the operator.
The effect of the commutator[17] is, in fact, equivalent to transposing the brushes of the collecting rings of the alternator every time the coil reaches a zero position.
A well-known type of alternator is the magneto machine which sends shocks through any one who completes the external circuit by holding the brass handles connected by wires to the brushes.
When the ends of the coil are connected to the terminals of an alternator the disc is set in rotation.
In most of the succeeding experiments I prefer, chiefly on account of the regular and positive action, to employ the alternator before referred to.
When a circuit is connected to an alternator there are an indefinite number of values for capacity and self-induction which, in conjunction, will satisfy the condition of resonance.
Even when making such observations with an alternator one is apt to be mistaken.
In the illustration the alternator A is in operation and is supplying current to the bus bars.
A rheostat is also introduced in the alternator field winding circuit to adjust the alternator pressure.
It is assumed that thealternator A is connected to the bus bars 1, 2, and 3, by the switch 1S.
A resistance is placed in series with one of thealternator leads, such that the drop across it, gives sufficient pressure for testing.
By speeding up the alternator to be cut in, or change the speed of both until frequency of both machines is the same.
The shaft of the turbine is extended at U and coupled to the shaft of the alternator by means of a flexible coupling.
In some cases after the alternator is installed the connection may be used to make a temperature test, using the actual commercial load the alternator is furnishing.
Care must be taken that the alternator is run at its rated speed, and this speed must be kept constant.
Fort Wayne switchboard panel for one alternator and one transfer circuit.
What percentage of the electrical energy manufactured by a high frequencyalternator can be transformed into variations of sound?
The powerful alternator on the Wondership was, of course, worked by the same motor that drove the big propellers.
The alternator began to buzz and spark, crackling viciously.
The phase wound armature can be used as an alternator in the same sense as mentioned above for the squirrel cage machine.
It consists of a standard rotary converter in combination with a revolving armature alternator mounted on the same shaft with the rotary converter and having the same number of poles.
It is used on a compositely excited alternator as illustrated on page 1,192.
The figures show an elementaryalternator and an elementary synchronous motor, the construction of each being identical as shown.
In the figures it is assumed that the motor has been brought up to synchronism with the alternator and connected in the circuit as shown.
This is the case of real synchronous operation, that is, not only is the frequency of motor and alternator the same, but the coils rotate without phase difference.
The undamped or "continuous" waves are generated by means of a high-frequency alternator or Poulsen arc.
In some cases an alternator is used in place of the battery B, Fig.
There is, therefore, a rush of current into the transformer, and if it is connected to an alternator of low armature resistance the fuses are generally blown and other damage done.
The roar of the alternator died down, first to a hum and then to a purr.
The humming whir of the great alternator rose gradually into a scream like the outcry of some angry thing.
It might be the turbine alternator of the Ring running by its own inertia for some time after the discharge had ceased.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "alternator" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: accelerator; auto; automobile; device; generator; muffler; parts; generator; muffler; parts
