document: Sensorless control of induction motor drives Controlled induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability . To replace the sensor the information on the rotor speed is extracted from measured stator voltages and currents at the motor terminals . Vector-controlled drives require estimating the magnitude and spatial orientation of the fundamental magnetic flux waves in the stator or in the rotor . Open-loop estimators or closed-loop observers are used for this purpose . They differ with respect to accuracy , robustness , and sensitivity against model parameter variations . Dynamic performance and steady-state speed accuracy in the low-speed range can be achieved by exploiting parasitic effects of the machine . The overview in this paper uses signal flow graphs of complex space vector quantities to provide an insightful description of the systems used in sensorless control of induction motors
doc_bio_tags: B I O B I I O B I I O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O B I O O O O O O O O O O O O B O B I O O B I I I O O O O O O O O O O O O O O O O O O O O O O O O O O B O O B O B I I O O O O O O O O O O O O O O O O B I O O O O O O O O O O B I I O O B I I O O O O O O O O O O B I O O O
extractive_keyphrases: sensorless control induction motor drives reliability stator voltages magnitude spatial orientation fundamental magnetic flux waves robustness sensitivity model parameter variations parasitic effects signal flow graphs space vector quantities
abstractive_keyphrases: stator currents vector-controlled drives open-loop estimators closed-loop observers steady-state speed accuracy