Speed Sensorless Variable Structure Torque Control of Induction Motor

摘要

Predlo?eno je upravljanje momentom asinkronog motora bez mjernog ?lana brzine vrtnje, koje omogu?uje rad na malim brzinama i u stajanju te pritom optimira i odziv momenta i u?inkovitost. Predlo?eno je upravljanje prili?no druga?ije od konvencionalnog upravljanja poljem i neposrednog upravljanja momentom. Razvijeni su, analizirani i eksperimentalno potvr?eni novi diskontinuirani regulator struje statora implementiran u FPGA i estimator rotorskog magnetskog toka zasnovan na kliznim re?imima i Ljapunovljevoj teoriji. Omogu?eni su glatki prijelaz u podru?je slabljenja polja i puna iskoristivost strujno-naponskih mogu?nosti napojnog pretvara?a. Performanse slije?enja referentne veli?ine brzine vrtnje i rotorskog magnetskog toka pokazane su eksperimentalno dobivenim prijelaznim pojavama.%Induction motor speed sensorless torque control, which allows operation at low and zero speed, optimizing both torque response and efficiency, is proposed. The control is quite different than the conventional field-oriented or direct torque controls. A new discontinuous stator current FPGA based controller and rotor flux observer based on sliding mode and Lyapunov theory are developed, analyzed and experimentally verified. A smooth transition into the field weakening region and the full utilization of the inverter current and voltage capability are possible. The reference tracking performance of speed and rotor flux is demonstrated in terms of transient characteristics by experimental results.