# What is the theory of AC generator?

## What is the theory of AC generator?

AC generators work on the principle of Faraday’s law of electromagnetic induction. When the armature rotates between the magnet’s poles upon an axis perpendicular to the magnetic field, the flux linkage of the armature changes continuously. Due to this, an emf is induced in the armature.

**What is the formula of AC generator?**

Emf induced in an AC generator If the coil of N turn and area A is rotated at v revolutions per second in a uniform magnetic field B, then the motional emf produced is e = NBA(2πv)sin(2πv)t, where we assume that at time t = 0 s, the coil is perpendicular to the field.

**What are the two types of AC generators?**

There are two types of AC generators and they are:

- Induction generators.
- Synchronous generators.

### What are the three basic types of AC generators?

Rotor

- Salient Pole Type Rotor (Used in low and medium speed (120-400 RPM) alternators)
- Cylindrical Type Rotor (Used in high speed (1500-3000 RPM) alternators)

**What are the application of AC generator?**

AC generators are used in power plants, electric scooters, sailboats, bicycles, and so on. The input to the AC generators is usually mechanical energy which is supplied by steam and gas turbines & internal combustion engines.

**How is AC generator produced?**

As one side of the coil moves up through the magnetic field , a current is induced in one direction. As the rotation continues and that side of the coil moves down, the induced current reverses direction. This means that the generator produces a current that is constantly changing. This is alternating current or a.c.

#### What is frequency in AC generator?

Generator Speed and Frequency are Proportional The electrical output of the generator must be maintained at a fixed frequency, 50 Hz or 60 Hz, to match the output of a standard electrical grid or the frequency rating of your appliances. The frequency is typically 60 Hz in the US and 50 Hz in Europe.

**What is torque in AC generator?**

Similarly in a generator, an external mechanical system is driving the rotation, therefore the mechanical torque from the driving system will be in the direction of motion (positive, counter-clockwise) and in steady state the electrical machine will produce an equal and opposite torque (negative, clockwise).

**How an AC generator works functions?**

In an AC generator, the coil through which current flows is fixed, and the magnet usually moves. The south and north poles of the magnet make the current flow in opposite directions, thereby creating an alternating current. In contrast, the coil in a DC generator is not fixed; rather, it rotates in a fixed field.

## What is the phase of AC generator?

An AC three-phase generator is simply three AC single-phase generators. These generators run sequentially with an offset of 120° between them taken two at a time. Thus, the generator produces three waves of AC voltage in one cycle facilitating the consistent supply of constant voltage.

**What are the applications of AC generator?**

**What is the importance of AC generator?**

An AC generator is used to power smaller electrical items in your business – such as coffee machines, computers, etc. On the other hand, a DC generator is used to power larger electric motors, even as big as those used in subway systems.