An induction motor, including a single rotor formed in one-piece and first and second stators disposed side by side, has a phase changing device for varying the phase difference between the rotational magnetic field generated by the first stator and that generated by the second stator. The phase changing...http://www.google.fr/patents/US5068559?utm_source=gb-gplus-shareBrevet US5068559 - Induction motor switchable between series delta and parallel wye
Induction motor switchable between series delta and parallel wye
