D.C. dynamic braking of saturistor motor

The use of rotor-circuit saturistors during d.c. dynamic braking of a wound-rotor induction motor was found to result in faster braking. With an injected direct current electromagnetically equivalent to the rated stator current, the effect of saturistors was to reduce the stopping time from full-voltage no-load operation by 40%. Deceleration time for a saturistor motor can be predicted by the use of steady-state d.c. dynamic-braking torque, using an extension of induction motor theory. Saturistors designed for braking purposes were also found to improve motoring performance by giving higher stall torque and lower stall current.