Real-time performance testing of a 3Φ VS WM inverter-fed induction motor

This paper presents a real-time performance testing of a three-phase (3phi) voltage-source (VS) six-pulse wavelet-modulated (WM) inverter-fed induction motor (IM). The proposed modulation technique is based on a set of three scale-based linearly-combined scaling functions shifted by 2pideg/3 from each other. These scaling functions are employed to sample three reference-modulating signals, each corresponds to one phase, in a non-uniform recurrent manner. Moreover, these scaling functions have dual synthesis scaling functions that are responsible for reconstructing the three continuous-time (CT) reference- modulating signals from their non-uniform recurrent samples. The reconstruction processes are carried out by the three synthesis scaling functions to achieve 180-degrees conduction mode of the 3phi six-pulse inverter. The proposed wavelet modulation technique is realized through a Turbo - C code that is executed by a dSPACE dsl 102 DSP board to generate switching pulses to activate the inverter six IGBT switches. The IGBT inverter supplies a 1 hp, 1750 RPM, 208 V, 60 Hz, F-connected 3phi squirrel-cage induction motor that is tested for several speeds. These test results demonstrate robust performance, simple implementation, significant dynamic responses and high ability to maintain high quality outputs.