Rotor circuit of a 6-p 50 Hz ind motor has 30 oscillations/minute while a center 0 ammeter connected to rotor circuit. What is the speed of the rotor?

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Why is only 50 Hz standardized as power frequency in many countries?
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Afroz Shaik
07-April-2015

Power Distribution Engineering Electrical Electrical Engineering Electrical Design

Question added by Muhammad Qasim , Senior Electrical Engineer , Energy Associates (SMC Ptv.) Ltd.
Date Posted: 2016/07/27

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1 Answers

by manzoor ummar , Electrical Engineer , Tata Consulting Engineers

Rotor speed is 990rpm.

Rotor current frequency is 0.5Hz. So Slip s=(0.5/50)=0.01.

Rotor speed N=Ns(1-s)=1000(1-0.01)=990rpm.

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