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

vijay kumar

• Oct 19th, 2015

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

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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