Sensorless speed measurement of AC machines using analytic wavelet transform

José M. Aller, Thomas G. Habetler, Ronald G. Harley, Rangarajan M. Tallam, Sang Bin Lee

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


A new method for 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.

Original languageEnglish
Pages (from-to)1344-1350
Number of pages7
JournalIEEE Transactions on Industry Applications
Issue number5
Publication statusPublished - 2002 Sep
Externally publishedYes


  • AC machines
  • Analytic wavelet transform
  • Direct torque control
  • Sensorless speed estimation
  • Short-time Fourier transform

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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