Electrical Machines

Why we are preferring 4 pole alternator in the production of electric power instead of 2 pole alternator ?

Questions by gguruprakash27

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RAKESH KUMAR GHOSH

  • Jul 28th, 2014
 

Because, speed is inversely proportional to number of poles for synchronous machine.

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s.asokan

  • Jul 28th, 2014
 

Speed is depend on number of poles and frequency. Commomnly all motors are used 1500 RPM and Indian standrad frequency 50hz also motor used 4 pole. In rare case nearly 3000 RPM (high speed motors, ht alternators) machines are used 2 poles.

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vijay kumar

  • Oct 19th, 2015
 

Number of poles are chosen to get 50Hz frequency for a given speed. n=(120*f)/p

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