At a predetermined point, the regulator contacts are automatically opened and the field current of the exciter must again pass through the rheostat.
The relay magnet will then attract its armature and by opening the shunt circuit at the relay contacts will throw the full resistance into the exciter field circuit tending to lower the exciter and alternator voltage.
The single pole switch is then closed and as theexciter field rheostat is short circuited, the exciter voltage will at once rise and bring up the voltage of the alternator.
This short circuits the rheostat through contacts in the regulator and the voltage of the exciter and alternator immediately rise.
The ~direct current control magnet~ is connected to the exciter bus bars.
The desired voltage may be maintained constant at the alternator terminals by rapidly opening and closing a shunt circuit across the exciter field rheostat.
The relay~ consists of a ~U~ shaped magnet core having a differential winding and a pivoted armature controlling the contacts which open and close the shunt circuit across the exciter field rheostat.
This operation is continued at a high rate of vibration due to the sensitiveness of the control magnets and maintains a steady exciter voltage.
The main contacts will then be again closed, the exciter field rheostat short circuited through the relay contacts and the cycle repeated.
Would that Envy had then been contented, that most bitter exciter of troubles!
Two independent circuits are thus formed, one including coils C of the exciter and E E of the generator, the other coils C' of the exciter and E' E' of the generator.
So, if the armature-coils F F' be closed through the motor, the latter will not be turned as long as the movement of the generator armature is synchronous with that of the exciter or of the magnetic poles of its field.
A compound amalgam of zinc and tin is probably the best exciter which can be applied to the cushions of electrical machines.
When concentrated, it is used only as a scent, or pungent exciter of the olfactory organs, in sickness and fainting fits.
All exciters are built as compound wound dynamos, capable of delivering the exciter current up to 125 volts, which is sufficient margin in the field to control the alternating current line voltage on circuits of unusually low power factor.
It will be seen from the figure that the separate exciter is fastened on the base plate and has its armature directly connected to the shaft.
The winding which supplies energy for the exciter transformer is located at the top of, and around the core of the constant current transformer.
But Apollo, exciter of troops, immediately aroused Æneas against the son of Peleus, and infused into him strong courage.
This morning, the primary exciter on the new ultracosmotron went haywire, and the beam of sodium nuclei burned through part of the accelerator tube wall.
The exciter is provided with a single series coil, through which the station output or a proportional part thereof passes.
The armature of the exciter is connected to the exciting coil on the booster, and thence across the mains as shown.
Since the exciter always generates a voltage in opposition to that of the line, this system is known commercially as the counter pressure system.
With an increase in external load above the average, the tendency is for an increase to take place through the exciter series coil, augmenting its field strength and consequently the exciter armature voltage.
When the load decreases below the normal, the current in the exciterfield is decreased, and its armature voltage falls below that of the system.
By locating the exciter at S, between the alternator and the engine, much floor space will be saved and the general appearance of the installation improved.
When a considerable variation of pressure is required, the exciter rheostat is manipulated, whereas for a fine adjustment of voltage the alternator rheostat is preferably employed.
This type of turbine dynamo set is especially applicable for exciter service in modern, superheated steam generating stations where the steam pressure exceeds 125 pounds.
Should any interruption to the operation of the wheel occur, causing a diminution of speed, the induction motor would drop back to full load speed and take up the exciter load, resulting in no appreciable drop of exciter voltage.
To avoid confusion keep on one side of board everything pertaining to exciter buses, and on other side everything pertaining to A.
As to the preliminaries, the excitermust first be started.
Considerable floor space would be occupied by an installation of this nature if the exciter be placed at M, and belted to the alternator as indicated by the dotted lines.
Sidenote: Exciter Engines] The two exciter engines are each direct connected to a 250 kilowatt direct current generator.
The brushes of copper wire which collect the current of the exciter dynamo, and others of similar pattern, must be placed so that the ends press on the commutator as shown in Fig.
The wires leading from the exciter to the other dynamo remain always connected, as there is no need for meddling with them.
This can only be done if the exciteris so constructed as to give the proper E.
Seaton, when the forces flying from the projector had built the compound exciter which would make possible the disruption of the atoms of uranium.
The exciter armature is mounted on the shaft of the alternator close to the spider hub, or in some cases at a distance sufficient to permit a pedestal and bearing to be mounted between the exciter and hub.
The exciter is belted to the alternator shaft, the driving pulley being located outside the main bearing.
The small pulley on the exciter gives an indication of its high speed as compared with that of the alternator.
It is designed for belted exciter, having a shaft extension at the collector ring end for exciter driving pulley.
The latter may be driven by independent power, or by belt connection with the main shaft, and in some cases the exciter is directly connected to the alternator shaft.
This is an example of direct connected exciter construction.
General Electric alternator with direct connected exciter mounted on shaft between field hub and bearing.
The exciter winding occupies a very small portion of the slot, being placed on top of the main winding, and connected to the commutator immediately in front of the core and between core and collector rings as shown.
As shown, both field windings encircle every pole, but in some machines the rectified current will traverse a few poles only, the current from the exciter traversing the remainder.
In other designs the exciteris placed between the bearing and hub.
Fort Wayne alternator with direct connected excitermounted on the field shaft at such distance as to permit a pedestal and bearing to be mounted between the exciter and revolving field.
The current for exciting the field magnets is obtained, partly from an exciter and partly from the windings of the alternator, being transformed into direct current by the rectifier.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "exciter" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: agitator; catalyst; demagogue; firebrand; incendiary; instigator; parts; ringleader
