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| Enhancing the Transient Response of Induction Motor Using Double Cage Rotor Model
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I. M. Uneze, I. U. Uju, C. O. Uneze
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Abstract:
A 37.3 kW single-cage motor has been modelled and then upgraded to a double-cage rotor via modelling. The objective was to enhance the steady-state and transient performance with respect to current, torque, and speed against time when the load torque changes from 0 to 10 Nm using double-cage rotor. The transient characteristics of the machine was demonstrated for no-load, half load, and full load. The simulation revealed that with double-cage rotor, the magnitude of the starting current was reduced while the starting torque was increased under all loading conditions. When a load change of 50% to 100% occurred for load torque of 10 Nm, it was clearly observed that the dynamic of single cage did not adequately fit the electromagnetic torque-speed curve within the 3 s simulation time frame. The simulation time was increased to 10 s as shown by the variation of speed over the range of 0 to 1500 rpm, indicating that only double cage can fit into the curve very well. The analysis indicated that the addition of inner cage has resulted in higher torque and lower resistances during the starting of the motor and improved the transient response time in terms of induction motor's starting performance.
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