Speed Estimation of an Induction Motor Operating in the Nonstationary Mode by Using Rotor Slot Harmonics
作者： Wilton Lacerda Silva , Antonio Marcus Nogueira Lima , Amauri Oliveira
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摘要: In this paper, an analysis of techniques digital signal processing used for estimating the motor slip and rotational speed induction operating in stationary or nonstationary condition by using rotor slot harmonics observed stator current waveform is presented. The novelty paper related with three topics. First, zoom short time Chirp-Z transform was to find fundamental supply frequency intending improve accuracy without increasing computational complexity. Second, it presents a tool that can be identify whether capable not producing principal harmonics. Finally, algorithm developed optimal window length maximum relative deviation. use approach analyzed when powered converter driving variable load strongly conditions. correctness method has been confirmed experimental test results. proposed implemented conventional sucker-rod pumping unit (25D-67-36-American Petroleum Institute), estimate converter.
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