Sensorless Control of Induction Machines - With or Without Signal Injection?

By Joachim Holtz. IEEE transactions on industrial electronics (1982. Print), 2006

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Digital Control of Power Converters—A Survey (2012, background): “In the past, these units were useful for counting encoder pulses for position or speed measurement, however, with the growing diffusion of sensorless drives [49], this function should disappear in a future; on the other hand, as pointed out in previous subsection, the new smart sensors require timer”
Power Electronics and Motor Drives Recent Progress and Perspective (2009, background): “It appears that sensorless vector control of ac drives [63], [64] is the clear trend of the future.”
Industrial Applications of the Kalman Filter: A Review (2013, methodology): “which means that the system can be used without a position sensor [14], [15].”
Design Method of Adaptive Full Order Observer With or Without Estimated Flux Error in Speed Estimation Algorithm (2016, methodology): “In general, the advantages of speed sensorless drives include low cost, reduced hardware complexity and size, improved reliability and less maintenance requirements [1].”
Controlled AC Electrical Drives (2008, methodology): “4) MRAS: The usual MRAS estimates speed using two different machine models, one being speed dependant [1], [5].”