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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
Open this folder and view contents3. Execution of rotating electrical machines
close this folder4. Synchronous machines
Open this folder and view contents4.1. Operating principles
close this folder4.2. Constructional assembly
View the document4.2.1. Stator
View the document4.2.2. Rotor
Open this folder and view contents4.3. Operational behaviour
Open this folder and view contents4.4. Use of synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer
 

4.2.2. Rotor

As regards rotor shape, one differentiates between the turbine and salient pole machines. Both rotor types feature a magnetic constant field. For this reason the rotor iron need not be a lamella pack.

The rotor of the turbine-type machine is called a non-salient pole rotor. It is cylindrically set up, rather long and has a relatively small diameter of up to some 1200 mm. A non-salient pole rotor only has a relatively small number of poles. Mainly it only features one pole pair, that is to say a north and south pole. As this machine mainly runs on alternating voltage of f = 50 Hz, this results in a considerable rotor speed. Thus, for example, a synchronous machine with one pole pair and alternating current at a frequency of f = 50 Hz, requires a speed of 3000 rpm.


Figure 39 - Two-pole non-salient pole rotor

The salient pole machine features a field spider with distinct poles which bear the exciter winding. This is relatively short and has a big diameter of some 10 m. The considerable number of pole pairs yield speeds of 60 rpm to 750 rpm given alternating voltage at a frequency of f = 50 Hz.


Figure 40 - Six-pole salient pole rotor

1 Field spider
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