What is the disadvantage of separately excited DC motor?

What is 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 is the purpose of separately excited DC generator?

Applications of Separately Excited DC Generators Because of their ability of giving wide range of voltage output, they are generally used for testing purpose in the laboratories. Separately excited generators operate in a stable condition with any variation in field excitation.

What are the difference between self and separately excited of DC 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) .

What is the advantage of self excited generator?

The advantages of using an induction generator instead of a synchronous generator are reduced unit cost and size, ruggedness, brushless (in squirrel cage construction), absence of separate dc source, ease of maintenance, self-protection against severe overloads and short circuits, etc.

Where is a separately excited dc motor used?

Separately excited DC motors are often used as actuators in trains and automotive traction applications. For their constant speed characteristics, shunt DC motors are used in fixed speed applications such as fans. square of armature current), they can be used in applications that require high starting torque.

What is separately excited dc motor?

In separately excited DC motors, the supply is given to the field and armature windings separately. The main feature of this type of DC motor is that the current through the armature doesn’t flow through the field windings because the field winding is energized by a separate DC source.

Where is a separately excited DC motor used?

What is separately excited DC motor?

What are the advantages and disadvantages of separately excited generator over a self excited generator?

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 are the characteristics of separately excited DC motor?

Operating Characteristics of a Separately Excited DC Motor Both in shunt-wound and separately excited types, the field is supported from a regulated voltage, so that the field current is fixed. Thus, these two motors have identical speed-armature current and torque–armature current features.

How does 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. Usually, in other DC motors, the field coil and the armature coil both are energized from a single source. The field of them does not need any separate excitation.