Experimental testing of a novel control for inverter-fed three-phase induction motor

This paper presents a real-time implementation of a new control approach for 3Phi induction motors. The conventional SPWM technique uses triangular carrier signals, which can be interpreted as a periodic form of the second order cardinal B-spline function. The proposed control approach is based on changing the order of the carrier signal. Such change in the order is achieved through multiplying the carrier signal with a sine function, whose phase is related to the inverter output current. Changing the order of any cardinal B-spline function will result in changing its filtering capabilities. In this paper, an experimental testing for the proposed resolution-level control approach is developed and tested on a 3Phi six-pulse VS SPWM inverter-fed squirrel-cage induction motor. The generation of switching pulses as well as an algorithm for carrying out the proposed resolution-level control are implemented using a dSPACE ds1102 digital signal processor (DSP) board. Test results demonstrate a significant performance improvement under the proposed control approach, where output harmonic contents are reduced, motor starting current is reduced and the magnitude of the fundamental component is improved. Experimental test results confirm the efficacy of the proposed control approach