A contribution to the theory of the double-cage induction motor [includes discussion]

This work has four chief objectives. The first objective is to compute the impedance of the rotor for a particular motor as accurately as possible. The second objective is to find out how the labor can be shortened without sacrificing accuracy. The third is to extend procedures to apply conveniently to any double-cage motor. The fourth is to increase our knowledge of locked saturation for motors with closed circular slots. The particular motor discussed is the 75-horsepower 440-volt three-phase 1,800-rpm one built by Westinghouse Electric Corporation. The data given apply to the rotor only. The rotor has a diameter of 11.018 inches and is stacked to 8 inches. It is punched with 50 identical slots; the form and dimensions are shown. It is die cast with aluminum of 50% conductivity and has end rings. The end rings have an outside diameter of 10.94 inches, an inside diameter of 7.69 inches, and a conducting axial dimension of 0.5 inch.