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A novel stator resistance estimation method for speed-sensorless induction motor drives

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2 Author(s)
Guidi, G. ; Fuji Electr. Corp. Res. & Dev. Ltd., Tokyo, Japan ; Umida, H.

A method for online estimation of the stator resistance of an induction machine is presented and a speed-sensorless field-oriented drive equipped with the proposed estimator is built. The drive is particularly suitable for low-speed operation. Resistance estimation is based on a two-time-scale approach, and the error between measured and observed current is used for parameter tuning. The simple full-order observer in use allows for direct field orientation in a wide range of operation. The system can drive active load and generate stall torque, as confirmed by numerical simulations and experimental tests on a general-purpose 7.5 kW induction machine.

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Industry Applications, IEEE Transactions on  (Volume:36 ,  Issue: 6 )