Transient behaviour of a 3-phase slip-ring induction motor with external impedance in the rotor circuit

An investigation is described into the effect of an external rotor circuit impedance on both the steady state and the transient behaviour of a 3-phase slip-ring induction motor. The external impedance took the form of a 3-phase resistor, capacitor, or saturistor and attention is directed towards the differences in the current, torques and speeds of the motor produced by the extra circuit components. [Continues.