It is possible for the invention to be embodied in {HEAD ~ an induction motor} of {TAIL ~ a wound rotor type}, or be combined with the switching of Y Δ connections of the stator windings in order to achieve the diversification of torque characteristics 
It is possible for the invention to be embodied in { HEAD ~ an induction motor } of { TAIL ~ a wound rotor type } , or be combined with the switching of Y Δ connections of the stator windings in order to achieve the diversification of torque characteristics
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