The three-phase alternator, Electrical Engineering

Assignment Help:

The Three-phase alternator

In this case, three separate sets of coils are wound on the stator and connected to produce three separate outputs. Because of the physical displacement of the coils around the stator, the outputs will have different phases with respect to each other. Three-phase systems are common even when DC outputs are required (e.g. electric alternators to charge a car battery) because of the torque reaction problem mentioned above. The AC output is rectified with a set of six diodes mounted in a single pack (two diodes are needed to rectify each phase).

A  two-pole, three-phase alternator is shown in the diagram below. Stator coils AB belong to phase 1, coils CD to phase 2 and coils EF to phase 3. Each pair of coils are connected  in series and their outputs add (e.g. A and B are connected in series to  produce  phase  1  output).  Notice  it  is two-pole because there are only two poles (i.e. one pole pair) on the rotor. The frequency of each phase output is therefore equal to the rotational speed of the rotor.

1357_The Three-phase alternator.png

 

 

 

Unlike the single-phase  alternator, it turns out  that  the  torque  required  to  drive  a three-phase alternator is constant, with no pulsating component. This is an important advantage.The figure below shows the arrangement for   a     multipole   three-phase   alternator. Again, coils A&B, C&D and E&F are connected in series to three differnet outputs, each with a phase shift  of 120° apart (because of the physical arrangement of the coils on the stator).

1646_Three-phase alternator.png

 

 


Related Discussions:- The three-phase alternator

Simulation of a standard ic linear regulator, 1.    Introduction The ob...

1.    Introduction The objective of this assignment is to design and evaluate a stabilised discrete linear power supply. The power supply requires to be designed according to t

3rd year electrical/electronics project, I`m a 3rd year electrical engineer...

I`m a 3rd year electrical engineering student studying in Canada, and there is a new course they added in my university for 3rd year students called Engineering Project. from the

Description of capacitor, Description of Capacitor r A capacitor has cap...

Description of Capacitor r A capacitor has capacitance of one Farad when current charging of one Ampere flows in one second. This process causing a transferring of one volt in p

Phasor diagram, The aim of this question is to help you become familiar wit...

The aim of this question is to help you become familiar with phasor diagrams, and in particular to see how the diagram changes when one of the system parameters (in this case resis

Microprocessor, distingish between maximum and minimum modes of operations ...

distingish between maximum and minimum modes of operations of 8086 with timing diagrames

Explain working of phase shift oscillator, Explain working of Phase Shift O...

Explain working of Phase Shift Oscillator? Figure shows a phase shift oscillator. Here the combination of ReCe provides self bias for the amplifier. The phase of the signa

Negative voltage regulator series, Negative Voltage Regulator series with N...

Negative Voltage Regulator series with Nine voltage options - IC 7900 Series The IC 7900 series of fixed output negative voltage regulators are complements to the 7800 seri

Fault analysis, The one line diagram of a simple three phase power system i...

The one line diagram of a simple three phase power system is shown in figure below. Each generator is represented by an emf behind the transient reactance. All impedances are expre

Substations, How to calculate Electrical losses by transformation

How to calculate Electrical losses by transformation

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd