What are the characteristics of series generator?

The internal characteristics of a DC series generator is the graph plotted between generated EMF (E) on-load and the armature current. Because of the effect of armature reaction, the magnetic flux on-load will be less than the flux at no-load.

What are the characteristics of DC generator?

Generally, following three characteristics of DC generators are taken into considerations: (i) Open Circuit Characteristic (O.C.C.), (ii) Internal or Total Characteristic and (iii) External Characteristic.

What is Series DC generator?

DC Series Generator

In a series-wound generator, the field winding is connected in series with armature winding so that whole armature current flows through the field winding as well as the load. The figure shows the connections of a series-wound generator.

What are the characteristics of a DC series motor?

The characteristic curves of a DC series motor are those curves which show relationships between the following quantities.
  • Torque and armature current (Ta/Ia characteristic). …
  • Speed and armature current (N/Ia characteristic)
  • Speed and torque (N/Ta characteristic) It is also known as mechanical characteristic.

What are the applications of DC series generator?

Applications of DC Generators

They are used in DC motors where speed control is necessary. They are used as portable generators where low power supply is required. They are used in motorcycles as dynamos, in toys such as remote control cars and in appliances such as electric shavers.

What are the different types of DC generator?

DC generators are mainly categorised into three types based on the field excitation methods. They are Permanent Magnet DC generator, Separately Excited DC generator, and Self-Excited DC generator.

What are characteristics of DC series and shunt motor?

Series winding takes care of the heavy load, whereas the shunt winding prevents the motor from running at dangerously high speed when the load is suddenly removed. These motors have generally employed a flywheel, where sudden and temporary loads are applied like in rolling mills.

What are the characteristics of a series field?

There are generally three most important characteristics of series wound DC generator which show the relation between various quantities such as series field current or excitation current, generated voltage, terminal voltage and load current.

What is use of DC series motor?

Series DC motors are generally used where high starting torque is required, and speed variations are possible. These types of direct connection motors are, for instance, used in the traction system, cranes, air compressors, vacuum cleaners, sewing machines, etc.

What are raising characteristics generators?

The external characteristics are shown with a curve, it lies below the internal characteristics due to a drop in armature and field windings. From the curves obtained we notice that an increase in IL, increases E. Therefore, the series generator characteristics are also called Raising Characteristics.

What are the characteristics of a separately excited DC generator?

The external characteristic of the separately excited DC generator is obtained by subtracting the drops due to ohmic loss (Ia Ra) in the armature from generated voltage (Eg). Terminal voltage(V) = Eg – Ia Ra. This curve gives the relation between the terminal voltage (V) and load current.

Why the characteristics are different that of DC shunt generator?

External Characteristic of Shunt Wound DC Generator

Ohmic drop due to armature resistance gives lesser terminal voltage the generated voltage. That is why the curve lies below the internal characteristic curve. The terminal voltage can always be maintained constant by adjusting the of the load terminal.

What is DC generator principle?

A DC generator is an energy converter that turns mechanical energy into electrical. This change in the form of energy happens based on the principle of electromagnetic induction which means wherever a change in the magnetic flux happens associated with a conductor, an EMF or an electromagnetic force is induced in it.

What is the name of DC generator?

A dynamo is an electrical generator that creates direct current using a commutator.

What is self excited and separately excited?

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) .

Why is a DC generator self excited?

Modern DC generators with field coils are self-excited generators which get started with the initial current in the field coils. When generator is switched off, a small magnetism is developed in rotor iron which induced electromotive force in the armature due to which current is produced in the field windings.

Why is it called DC generator?

A DC generator or direct current generator is one kind of electrical machine, and the main function of this machine is to convert mechanical energy into DC (direct current) electricity.

What are the advantages of a DC generator?

From what you read above, we can say that the main advantages of DC generators include simple design, simple parallel operation, and fewer problems of system stability. You also read about different types of DC generators and their working principle.