A method of calculating the performance characteristics for induction machines having solid steel rotors is presented. An equivalent circuit is derived in which the expressions for the circuit elements include the effects of rotor steel saturation, the finite length of the rotor, and the effect of induced rotor currents on the air gap flux density distribution. The analysis may be applied, with equal facility, to machines operating under conditions of constant voltage supply, or constant current supply. The accuracy of the method is demonstrated by comparison of torque/slip, power factor/slip, and current/slip curves that have been obtained by calculation and from practical tests. Results for three solid rotor machines of different rating, and pole number, are presented.
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Penman et al. (1980) studied this question.
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