Sensorless Vector Induction Motor Drive 1995–2001

Since day one of my PhD pursuit creating sensorless vector induction motor drive was a final goal. Entire research and development and all courses taken lead to successful realization of that. First phase of the project included building reliable simulation model of induction motor. I have used for that MATLAB/Simulink environment which in final phases was used in conjunction with Digital Signal Processor (DSP - TMS320C30 on dSpace board). After building good simulation I have spent a lot of time researching and developing methods for rotor flux estimation which were immune to changes in motor parameter changes (due to temperature changes). Those methods as an input took only easily measurable values such as stator voltages and currents and excluded measurement of motor speed (as an highly fault prone measurement). During that time I have performed countless simulations, comparisons and tests - pure research. The last phase of project was to create AC drive to prove researched methods in real life application. I was deeply involved in building actual drive by preparing requirements to suite available motors, power sources and control environment (DSP), selecting components and finally debugging electronic circuits. I was solely responsible for implementation of control algorithms, development of DSP and supervisory software. On a real drive I have repeated some of theoretical and simulation research to prove application of technology in commercial products. Outcomes were laid in my thesis for which I received Siemens award for outstanding technological and scientific research achievements.