Yu-Chao LinLI-CHEN FUChin-Yu Tsai2020-05-042020-05-04200008906327https://scholars.lib.ntu.edu.tw/handle/123456789/488934https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034155331&doi=10.1002%2f%28SICI%291099-1115%28200003%2f05%2914%3a2%2f3%3c109%3a%3aAID-ACS588%3e3.0.CO%3b2-5&partnerID=40&md5=4e5764cdb78a280cead62b8bb997eb58In this paper, a nonlinear indirect adaptive sensorless speed and flux tracking controller for induction motors is proposed. In the controller, only the stator currents are assumed to be measurable. Flux observers and rotor speed estimator are designed to relax the need to flux and speed measurement. Besides, two estimators are also designed to overcome drifting problem of the rotor resistance and unknown load torque. Rigorous stability analysis based on Lyapunov theory is also performed to guarantee that the controller designed here is stable. Computer simulations and experiments are done to demonstrate the performance of our design.Computer simulation; Control system synthesis; Electric resistance measurement; Induction motors; Lyapunov methods; Magnetic flux; Nonlinear control systems; Rotors (windings); Speed control; Stators; System stability; Torque control; Adaptive sensorless speed control; Flux tracking controller; Rotor resistance; Stator currents; Adaptive control systemsjournal article10.1002/(SICI)1099-1115(200003/05)14:2/3<109::AID-ACS588>3.0.CO;2-52-s2.0-0034155331