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Vector control of a speed sensor-less induction motor at very low speed

DONG Lei, LI Yongdong(Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)  
The rotor flux angle of an induction machine at very low speed cannot easily estimated; therefore, an independent highfrequency signal was injected in to the terminal of an induction motor to estimate the flux angle. This paper presents an analysis of an induction motor model with a highfrequency fluctuating signal injection. When the highfrequency fluctuating signal is injected into the terminal of the induction motor, the difference between the impedance of the d and qaxis of the synchronous rotating reference frame can be measured. The rotor flux angle is then tracked by tuning the space vector of the highfrequency signal for vector control of induction motors at very low speed. Experimental results verify that the algorithm is robust against parameter variations and load changes and that the rated torque can be put out at very low speed including zero. 
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