Induction motors under unbalanced conditions

A general equation (17) for the output of an induction motor operating under unbalanced conditions of applied voltage and primary and secondary impedance, is deduced in terms of frequency of applied voltage, slip, and rotor copper losses. General equations for the currents flowing in the windings are given in appendix I, from which the secondary copper losses, and hence the output and torque, may be calculated. Special conditions of partial unbalance also are considered.