Alternator

Working Principle of an Alternator or Synchronous Generator

A generator running at synchronous speed and generating three-phase voltage is called a three-phase synchronous generator or alternator. Similar to the dc generator an ac generator or alternator works on the same principle …

Voltage Regulation of Alternator or Synchronous Generator

When an alternator is loaded the armature terminal voltage will be less than the emf induced in the armature. This is because due to the effect of armature reaction there will be a drop in induced emf. Suppose if the load i…

Zero Power Factor or Potier Triangle Method

In the last two articles, we have seen the determination of voltage regulation using the synchronous impedance method and MMF or ampere-turn method . The drawback of the synchronous impedance method is that the regulation …

Phasor Diagram of Synchronous Generator or Alternator

In the last article, we have derived the equation for EMF induced in the alternator . The equation for per-phase induced emf E ph in an alternator is given as, E ph = 4 K f K c K d f φ T volt      When an alterna…

Distribution Factor or Breadth Factor - Definition & Formula

In concentrated winding, all the coil sides of any one phase are connected in series and grouped together in one slot, and placed under one pole. So that the magnitude and phase difference of the emf induced remains the sam…

What is Synchronous Reactance & Synchronous Impedance ?

When an alternator is loaded, there will be a circulation of load current in the armature winding. Once the load on the alternator is increased, the terminal voltage changes ( for constant excitation ) due to the following …

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