Why is the salient pole rotor in a synchronous machine made of laminated steel whereas a cylindrical rotor does not have any lamination?
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Because in stator there is a AC flux and laminated steel construction minimizes the loss due to eddy currents, meanwhile the rotor flux is DC, therfore no eddy currents can exists in rotor.
answered Oct 5, 2015 at 7:40
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\$\begingroup\$ I think the OP asked about the rotor i.e. comparison of two types of rotor. I'm not sure if you have addressed that. \$\endgroup\$– Andy akaCommented Oct 5, 2015 at 8:22
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\$\begingroup\$ @Andyaka : You are correct, I didn't noticed. Then a logical explanation (my thougts) would be that cylindrical rotors are used in turbo generators with high speeds/forces and they are machined from solid steel. Salient pole rotors are made for hydro plants, slower speeds where laminated construction is cheaper. \$\endgroup\$ Commented Oct 5, 2015 at 9:24