Comments on "Sensorless speed measurement using current harmonic spectral estimation in induction machine drives" [with reply]

The paper by H.D. Hurst and T.G. Habetler (see ibid., vol.11, no.1, p.66-73, 1996) presented a method for measuring the rotational speed of an induction machine using the line current harmonics caused by the rotor slotting. This method used a spectral aliasing algorithm (SAA) to enhance rotor slot harmonics. It was stated that the SAA was more accurate and robust than methods based on the fast Fourier transform (FFT). However, the comparison of both methods to support such a statement is not included in the paper. The author presents such a comparison and concludes that the affirmation made by Hurst and Habetler is not correct. The original authors reply to the comments.