An Induction Motor with Paralleled Rotor and Stator

A wound rotor induction motor may be operated with the stator and the rotor independently magnetized, (neither supply frequency corresponding to the slip frequency). If the stator and rotor are paralleled the pull-out torque as a motor is approximately doubled and the continuous horsepower output may be increased, and as an induction generator, the maximum kva. output is increased. It may be operated simultaneously as a motor and as a generator. This method of operation was new to the authors and to several eminent induction motor designers and as no reference has been found to others employing this principle, the theory has been developed and is presented with the experimental results of tests.