By locating a hard magnetic material, such as Alnico, in the leakage flux paths of the secondary circuits of an induction motor, a remarkably high locked-rotor torque per ampere can be obtained, without sacrifice of full-load speed. This paper presents test data for both wound-rotor and squirrel-cage motors, using this Saturistor principle. The motors so made are series hysteresis (induction) motors, with completely different characteristics from the familiar shunt-type hysteresis (synchronous) motor.
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Alger et al. (1963) studied this question.