The definitions of Virtual Reality are wide and varied, though all imply the same meaning, that of “The illusion of participation in a synthetic environment rather than external observation of such an environment...” [8]. Current technology is far from perfect in creating such an illusion though the present day systems offer a level of interaction and feeling of immersion in such a world that i...

A wide-speed-range sensorless control for an IPMSM is deeply studied in this paper, which combines the high-frequency injection (HFI) method and sliding-mode observer (SMO) method. At low-speed range, a rotating voltage signal injected into IPMSM; rotor position can be estimated by HFI based on saliency of IPMSM. high-speed SMO extended back electromotive force (EMF) utilized to estimate positi...

A novel CMOS monolithic analog multiplier capable of operating in two quadrants is described in this thesis. The multiplier incorporates a voltage-controlled variable linear resistor comprised of two FET transistors in the feedback network of an operational amplifier. This novel approach to implementing an analog multiplier results in good linearity and wide input dynamic range when compared to...