Saturistor control of induction motor

A simple analytical method is given for calculating induction-motor performance with a saturistor, alone or in series with a resistor, in its wound-rotor circuit. A digital-computer program, with fast convergence for iterative calculations, is developed for considering the resistor and saturistor in parallel. Despite the nonlinearity of the saturistor reactance and resistance, as well as motor saturation, the d.c. -dynamic-braking stopping time is computed analytically with reasonable accuracy. A wide range of speed/torque characteristics, appropriate for special applications, are shown to be available by varying the saturistor turns with suitable parallel resistors.