(Solved): A three-phase, eight-pole, 60Hz,4160V,1000kW squirrel-cage induction motor has the follow ...

A three-phase, eight-pole, $$60?\mathrm{Hz},4160?\mathrm{V},1000?\mathrm{kW}$$ squirrel-cage induction motor has the following equivalent-circuit parameters in ohms per phase $$Y$$ referred to the stator: $$R_1=0.220R_2=0.207X_1=1.95X_2=2.42X_{\mathrm{m}}=45.7$$ Determine the changes in these constants which will result from the following proposed design modifications. Consider each modification separately. a. Replace the stator winding with an otherwise identical winding with a wire size whose cross-sectional area is increased by 4 percent. b. Decrease the inner diameter of the stator laminations such that the air gap is decreased by 15 percent. c. Replace the aluminum rotor bars (conductivity $$3.5\times 10^7\mathrm{mhos}/\mathrm{m}$$ ) with copper bars (conductivity $$5.8\times 10^7\mathrm{mhos}/\mathrm{m}$$ ). d. Reconnect the stator winding, originally connected in $$\mathrm{Y}$$ for $$4160?\mathrm{V}$$ operation, in $$?$$ for $$2.4\mathrm{kV}$$ operation.