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OpenStudy (anonymous):

when and why field current control method is preferred, below rated speed or above rated speed ?

OpenStudy (anonymous):

ANS: Above Rated Speed Speed, N α Back EMF(Eb)/Flux(Φ) So as we adjust the field rheostat & decrease the resistance ,field current decrease,then field flux(Φ) decreases.Hence as per the speed equation, SPEED INCREASES.

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