What is Generator ?

These are also called as alternators.

It is the most important means of producing electrical power in many of the places since now days all the consumers are using AC.

It works based on principle of the electromagnetic induction.

These are of two types one is induction generator

other one is synchronous generator

The induction generator requires no separate DC excitation

This concept takes place when conductor coils turn in a magnetic field actuating a current and a voltage.

The generators should run at a consistent speed to convey a stable AC voltage

Synchronous generators

These may be rotating field type or rotating armature type.

In rotating armature type, armature is at rotor and field is at stator.

Rotor armature current is taken through slip rings and brushes.

These are limited due to high wind losses.

These are used for low power output applications

Rotating field type of alternator is widely used because of high power generation capability and absence of slip rings and brushes.

Rotating field type of alternator is widely used because of high power generation capability and absence of slip rings and brushes.

It can be either 3 phase or two phase generators.

A two-phase alternator produces two completely separate voltages

Each is generated voltage completely independent of the other.

These can be connected either delta or wye connections. In Delta Connection each coil end is connected together to form a closed loop.

A Delta Connection appears like the Greek Letter Delta

In Wye Connection one end of each coil connected together and the other

each coil left open for external connections

A Wye Connection appears as the letter Y.

These generators are packaged with an engine or turbine to be used as a motor-generator set and used in applications like naval, oil and gas extraction, mining machinery, wind power plants etc