Mechanical Principle of AC Generators

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AC generator works based on the electromagnetic induction basic principle. Alternating voltage to be generated by the rotation of magnetic field in a stationary coil anchor. In this case the field coil is located on the same piece with the rotor of the generator. The value of the voltage generated depends on:

  1. The number of windings in the coil.
  2. Strong magnetic field, if the field is strong, then the voltage that induced will be larger.
  3. Rotational speed of the generator.

The principle of this generator can be simply explained that the voltage will be induced on the conductor when the conductor is moving in a magnetic field so that the cutting lines of force. Applicable law right hand on the generator which states that there is a relationship between the conductor moves, the magnetic field direction, and the resultant direction of current flow is induced.

When the thumb indicates the direction of motion of the transmitter, the thumb indicates the direction of flux; the middle finger shows the direction of inducted electron flow. This law also applies when the magnet instead of the sender is moved.

There are two types of construction of an AC generator; Stationary Fields and Rotating Magnetic Field.

Definition of Generator

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Generator is a machine that can convert mechanical energy into electricity through a process of electromagnetic induction. These generators obtain mechanical energy from the prime move.

The working principle of the generator in accordance with the laws of Lens, i.e. electric current supplied to the stator will cause the electromagnetic moments are against round of the rotor so causing EMF on the rotor coil.

This EMF voltage will produce a current anchor. So the diesel as the prime mover generator rotor will rotate, then the rotor excitation given in order to create the magnetic field intersects the conductors on the stator and generates a voltage in the stator.

Because there are two different poles of north and south, then in the first 90o will be generated maximum positive voltage, and at a second angle of 270o will be generated maximum negative voltage. This happens continuously. Form is more commonly known as voltage as a function of alternating voltage.

Alternating current generator is often referred to as a synchronous generator or alternator. Alternating current generator provides a very important relationship in the process of change in energy from coal, oil, gas, or uranium into a form useful for use in industrial or household.

In alternating current generator is a small low-voltage, field placed on a rotating part or rotor winding and anchor in the silent or the stator of the machine.