You have a seperately excited generator and then you have a shunt generator which has the field winding in parallel with the armature terminals. In DC machines a separately excited generator could be run as a shunt generator provided the field winding is designed to work on the generated voltage. A separately excited alternator needs a DC supply for the field winding. In car alternators that is taken from the main winding via a rectifier and a voltage regulator.
location of local oscillatorself - oscillator is integral to mixerseparate - oscillator is a physically separate stage
a device to measure rotation speed of a shaft as a proportional voltage
Either or both can be separately excited. To generate voltage you need a big magnet( the field). Most generators use an electro-magnet. Now the electro-magnet needs a source of power (electricity). We could use the generators own output to excite the field (magnet), this is called self excitation. The problem with self excitation is that we have to wait for the generator to turn and start generating, also to start generating (Building up) there must be some left over magnetism from the last time it was run (called residual magnetism) or not even a little voltage will be generated to start the field current flowing. To solve these problems we could use separately excited. This means we must have a separate source of power to excite the field to produce the magnetism. Sometimes a battery or gasoline driven generator is used to excite the field of a very large generator to get it generating and then we can use some of the generated output to either recharge the battery or switch over to from the battery. In any case we have adjustable control of the generator all the time. This is why most generators are designed to be separately excited. And that is why you car has a voltage regulator. It wakes up the alternator when the engine is started by separately exciting it (the field) with the battery and then regulates the output voltage of the alternator as the engine changes speed with the driver's commands from the gas pedal.
Its a servo.
in a separately excited generator the field coils are excited from a separate source like a dc battery may be or any other small generator. They are self starting generators.
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As a separate supply is required to excite field, the use is restricted to some special applications like electro-plating, electro-refining of materials etc. But what is the difference between self excited and separately excited?
You have a seperately excited generator and then you have a shunt generator which has the field winding in parallel with the armature terminals. In DC machines a separately excited generator could be run as a shunt generator provided the field winding is designed to work on the generated voltage. A separately excited alternator needs a DC supply for the field winding. In car alternators that is taken from the main winding via a rectifier and a voltage regulator.
TACHOGENERATOR IS USED TO CONVERT MECHANICAL ENERGY INTO ELECTRICAL ENERGY OR MORE SIMPLY CONVERT REVOLUTION OF THE SHAFT OF A GENERATOR TO A ANALOG VOLTAGE
"Both them and us were excited" is not correct usage. Look at how the pronouns would be used separately, then combine them in one, correct sentence. You would say "They were excited" not "Them were excited." Similarly, you would say "We were excited," not "Us were excited." The correct combination would be: "We and they were excited."
There are two types me dc generator 1 separately excited dc generator 2 self excited dc generator
location of local oscillatorself - oscillator is integral to mixerseparate - oscillator is a physically separate stage
When reverse the direction of a seperately excited DC generator,only polarities has been reversed,i.e., (+) becomes (-) and (-) become (+).
The difference between a separately excited DC generator and a Shunt DC generator is that for a separately excited Dc generator , the excitation field winding is supplied by an external source different from that supplying the armature while for shunt generator, the excitation field windind is connected in series with the armature and supplied by a single source.
as speed increases, induced voltage increases