Abstract

Real-time implementation of PI controller based cost effective inverter fed speed control of induction motor drive using high performance TMS320F2812 DSP with VisSim/ embedded controls and developer (ECD) is presented in this paper. The four switch three-phase inverter (FSTPI) fed drive system consists of a power circuit having an insulated gate bipolar junction transistor (IGBT) based bridge inverter module feeding a 5 hp three-phase squirrel cage induction motor and control circuits that comprises of digital signal processor (DSP), processor board, driver circuit, sensor (for sensing speed signals), interfacing circuits and PC with VisSim/ECD software. The PI controller block and PWM generation block of this drive system are designed using VisSim/ECD to control the speed of induction motor in closed loop. Observations are made by changing speed of motor at different loads. Results obtained from this experimental work are satisfactory and shown using GUI of VisSim /ECD software and digital storage oscilloscope.

Key words: Four switch three-phase inverter (FSTPI), digital signal processor (DSP), proportional integral (PI), Sinusoidal pulse width modulation (SPWM) and VisSim/ embedded controls and developer (ECD).