Novel speed and position estimation in field-oriented control of induction machine drive system

This paper describes a novel technique which has been proposed to simplify field orientation control system. This technique depends on zero crossing detection of different waveform of stator fluxes using the comparator reference signal which control the inverter transistors. By using this technique it is available to update the position theta and stator current components in the rotational reference frame up to twelve times per cycle. As a result, the transformation from two phase stationary reference frame (SRF) to two phase rotating synchronously reference frame (RRF), has been canceled which leads to less consumption time in software. Thus control algorithm requires less time to be implemented via software for position detection and speed estimation.