in slip ring motor if motor specification is given how we calculate its rotor

in slip ring motor if motor specification is given how we
calculate its rotor resistance in starting

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in slip ring motor if motor specification is given how we calculate its rotor resistance in starti..

Answer / venkat

V, Power rating is given
at start s=1
Nr=(1-s)*Ns
ir=sE2/sqrt of (r2+sE22)
P=sqrt(3)*V*I* Cos pi
from which we get r2

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