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Speed-sensorless torque control of induction machine based on carrier signal injection and smooth-air-gap induction machine model

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3 Author(s)
Guanghui Wang ; Pennsylvania State Univ., University Park, PA, USA ; H. F. Hofmann ; A. El-Antably

A speed-estimation technique for induction machines, based on carrier signal injection and the standard two-axis smooth-air-gap induction machine model, is presented. The proposed speed-estimation technique can work over a wide range of operating points, including fundamental dc excitation. The stability of the algorithm is analyzed using a two-time-scale approach. Based on the estimated rotor speed, a torque controller is designed. Experimental results are presented confirming the validity of this approach. A method to reduce torque ripple generated by the injected carrier signals is also introduced

Published in:

IEEE Transactions on Energy Conversion  (Volume:21 ,  Issue: 3 )