Alternators

Why do not we use salient pole alternators in thermal power stations?

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zeeshan ahmed

  • Nov 18th, 2012
 

Because salient pole alternator is designed for low speed of 0-1500rpm and for low power. since the speed and power in thermal plant is high, we go for non salient alternators.

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Salient pole rotor has larger diameter than cylindrical rotor. In thermal power plant rotor should rotate in high speed so that salient pole will unstable due to larger diameter so that we cant use salient pole in thermal power plant.

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umeshprabhu

  • Mar 11th, 2013
 

The Salient pole alternator because of its large diameter and short axial length takes more time to complete one revolution for a pair of poles under a coil, so the frequency of induced emf which is proportional to speed of the rotating magnetic field in rotor is less this leads to less induced emf in stator compared to that of cylindrical rotor which can generate more cycles of emf because of its smooth surface and also the cylindrical rotor has short diameter and long axial length

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