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Sensorless speed measurement of AC machines using analytic wavelet transform

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5 Author(s)
Aller, J.M. ; Departamento de Conversion y Transporte de Energia, Simon Bolivar Univ., Caracas, Venezuela ; Habetler, T.G. ; Harley, R.G. ; Tallam, R.M.
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A new method for the sensorless speed estimation of AC machines, using the analytic wavelet transform of the stator current signal, is proposed for a direct torque control drive. A comparison with results obtained using the short-time Fourier transform is included. The proposed method can be implemented in real time on a digital signal processor. The time-frequency resolution obtained and the computation time required by the proposed algorithm are improved in comparison to existing techniques, and the method can be applied over the entire speed range.

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Industry Applications, IEEE Transactions on  (Volume:38 ,  Issue: 5 )