What are the disadvantage of separately excited DC motor?

The disadvantage of a separately excited DC generator is the same that we require an external DC source for excitation. But since the output voltage may be controlled more easily and over a wide range (from zero to a maximum), this type of excitation finds many applications.

What are the advantages and disadvantages of DC generator?

Like other machines, DC generators have some disadvantages, such as: DC generators can’t be applied to a transformer. DC generators have low efficiency because there are copper losses, eddy current losses, hysteresis losses, and mechanical losses. A voltage drop over long distances would occur.

What is separately excited DC 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.

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

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 the advantage of self excited generator?

Advantages: It is good for variable speed control. The field can be connected to a constant voltage source to ensure full torque is available at all speeds. The armature can be connected to a variable voltage DC source to achieve speed control.

What are the advantages and disadvantages of generator?

AC is very easy and efficient to transmit over a long distance rather than DC. The design of the AC generator is fairly simpler than DC generator type. No need for matching a voltage. Cost of ownership is lower.

Where are separately excited generators used?

Applications of Separately Excited DC Generators These are able to produce a wide range of voltage output, they are primarily used in laboratory and commercial testing. These are used in speed regulation tests. These generators operate in a stable condition with any change in field excitation.

What are the advantages of DC?

Advantages of direct current (DC)

• Increased popularity.
• Residential loads use DC.
• Wide application.
• High power quality.
• Reduced installation cost.
• Easy integration to renewables.
• No reactive power and skin effect.
• Telecommunication and data center usage.

What are the advantages and disadvantages of a DC shunt motor?

The installation of DC machines is expensive compare with other types of machines. Shunt motor is a constant speed motor, it would be disadvantages where it’s necessary to operate under variable speed. For the same current input, its starting torque is not a high as that of a DC series motor.

What are the disadvantages of a separate excited generator?

The main disadvantage of a separately excited generator lies in the inconvenience and expense of providing the separate excitation source. For this reason, the use of this type of generator is limited to experimental and testing laboratories where such a source is available and a wide variation of the output voltage is desirable.

Can we get constant voltage from a separate excited DC generator?

Therefore, we can get constant terminal voltage. 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.

What are the advantages of the armature of a DC generator?

The armature can be connected to a variable voltage DC source to achieve speed control. It makes the motor easier to reverse. By reversing the polarity of the field supply, the motor will run in reverse. answer, but. I think the main advantage is that you can control the output of the generator by contolling the magnetic field.

What is a self excited DC generator?

For comparison, a self-excited dc generator is a dc generator whose field magnet winding is supplied by current from the output of the generator itself. What is the difference between separately excited and self excited motor?