What are the advantages of separately excitation DC machines over self excitation DC machines?

Separately excited DC generators have many advantages over self-excited DC generators. It can operate in stable condition with any field excitation and gives wide range of output voltage. The main disadvantage of these kinds of generators is that it is very expensive of providing a separate excitation source.

What is the main reason for the voltage drop in a separately excited DC generator as the load is increased?

(3.3) (i). As the load current increases, the terminal voltage falls due to two reasons: (a) The armature reaction weakens the main flux so that actual e.m.f. generated E on load is less than that generated (E0) on no load. (b) There is voltage drop across armature resistance (= ILRa = IaRa).

What is the reason why a separately excited DC generator is no longer used today?

Because it requires a separate DC power supply, the separately excited machine is usually used only when a wide range of voltage control (generator) or speed control (motor) is required.

What is the practical difference between a separately excited and a shunt de motor?

A separately excited dc motor is a motor whose field circuit is supplied from a separate constant-voltage power supply, while a shunt dc motor is a motor whose field circuit gets its power directly across the armature terminals of the motor.

What is the advantages of separately excited generator over self excited generator and vice versa?

The separately excited dc generators have a decided advantage over the self-excited generators – it operates in a stable condition with any field excitation. Thus a wide range of output voltage may be obtained.

What is the difference between self excited generator and separately excited generator?

In a separately excited (S.E.) machine, the field winding is connected to a separate voltage source while, in a self excited generator field winding is connected across the armature terminals (provides its exciting current) . Hence, the field winding has a large number of turns with a thin conductor.

What is DC separately excited generator?

A separately excited DC generator is the one whose field winding is supplied by an independent external DC source (like a battery). The magnitude of generated voltage depends upon the speed of rotation of armature and the field current, i.e., greater the speed and the field current, higher is the generated voltage.

How does a separately excited generator work?

What is the difference between separately excited dc generator and self excited dc type generator discuss?

What is the difference between self excited and separately excited generator?

How does a separately excited DC generator work?

How does a separately excited DC motor work?

Separately excited dc motor has field coils similar to that of shunt wound dc motor. The name suggests the construction of this type of motor. Here, the field coil is energized from a separate DC voltage source and the armature coil is also energized from another source.

What are the advantages and disadvantages of separately excited DC generators?

Separately excited DC generators have many advantages over self-excited DC generators. It can operate in stable condition with any field excitation and gives wide range of output voltage. The main disadvantage of these kinds of generators is that it is very expensive of providing a separate excitation source.

Why is voltage regulation poorer in a DC generator?

So voltage regulation is poorer than a separately excited dc generator where field current is not affected by terminal voltage (ie, the loading condition).

What is the difference between separately excited generator and self excited generator?

Aside the obvious differences like the separate power source for the separately excited generator and the self excited provides the field current from its own output.. The self excited generator does not have quite as good voltage regulation. It’s voltage output is fixed

Why there is no load voltage in shunt wound DC generator?

In shunt wound DC generators, there is always some no load voltage due to the existence of shunt field winding. As the load increases, the terminal voltage of this type of DC generators decreases very quickly.