An induction motor speed measurement method based on current harmonic analysis with the chirp-Z transform |
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Authors: | Aiello M. Cataliotti A. Nuccio S. |
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Affiliation: | Electr. Eng. Dept., Univ. di Palermo, Italy; |
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Abstract: | This paper presents a new method to measure motor speed by means of frequency estimation of rotor slot spectral components in the supply current of squirrel single-cage induction motors. The novelty of the method consists in the harmonic analysis of the supply current by means of the chirp-Z transform (CZT). The advantages are improved accuracy due to better spectral resolution and resolvability. Moreover, a shorter observation window is required, thus reducing errors related to nonstationary current signals. The experimental results are presented to validate the proposed method and to make a comparison with a similar method based on the fast Fourier transform (FFT). |
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