Title :
Sensorless speed measurement of AC machines using analytic wavelet transform
Author :
Aller, José M. ; Habetler, Thomas G. ; Harley, Ronald G. ; Tallam, Rangarajan M. ; Lee, Sang Bin
Author_Institution :
Departamento de Conversion y Transporte de Energia, Simon Bolivar Univ., Caracas, Venezuela
Abstract :
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.
Keywords :
AC machines; Fourier transforms; control system analysis; machine theory; machine vector control; time-frequency analysis; torque control; velocity control; wavelet transforms; AC machines; analytic wavelet transform; computation time; control simulation; direct torque control; sensorless speed estimation; sensorless speed measurement; short-time Fourier transform; stator current signal; time-frequency resolution; AC machines; Digital signal processors; Fourier transforms; Signal analysis; Stators; Time frequency analysis; Torque control; Velocity measurement; Wavelet analysis; Wavelet transforms;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2002.802988
