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

Question Posted / guest

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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