Double Cage Rotor Induction Motor

Twin-Slot-Cage Rotor




Double-slot rotors as well as double-cage rotors form the category of twin-slot-cage rotors: Fig. 194: double-slot double-cage Material: starting cage: brass, bronze; operation cage: copper Revealing design is made possible by using two different cages. The starting cage features a large active resistance and low leakage reactance, whereas the operation cage oppositely shows low active resistance and large leakage resistance. At startup the rotor current predominantly flows inside the starting cage, caused by the high leakage

reactance of the operation cage. The start-up torque is raises caused by the high active resistance of the starting cage. In nominal operation with low rotor frequency, the rotor current splits with reciprocal ratio of the active resistances and therefore principally flows in the operation cage. Low nominal slip accompanied by reasonable efficiency ensues due to the
small active resistance.






























































                             
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