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The theoretical analysis based on electromagnetic field theory is given for high speed aerospace induction motors whose solid rotor is provided with layers of highly permeable and highly conductive materials. Numerical solutions indicate that the efficiency of the rotor as compared with a solid iron rotor is increased considerably. The torque-speed characteristic of the composite rotor motor rises steeply and is nearly flat between 20 and 100 percent slip. The design approaches the characteristic of a multiple cage motor. Operating temperatures are considerably reduced.