Speed Estimation of an Induction Motor Operating in the Nonstationary Mode by Using Rotor Slot Harmonics


During this paper, an analysis of techniques of digital signal processing used for estimating the motor slip and rotational speed of an induction motor operating in stationary or nonstationary condition by using rotor slot harmonics observed in the stator current waveform is presented. The novelty of this paper is related with 3 topics. First, zoom short time Chirp-Z remodel was used to find the elemental supply frequency intending to boost accuracy while not increasing computational complexity. Second, it presents a tool that may be used to spot whether a motor is capable or not of producing principal slot harmonics. Finally, an algorithm was developed to search out an optimal window length using rotational speed maximum relative deviation. The employment of this approach was analyzed when the motor was powered by a frequency converter driving a variable load and operating in strongly nonstationary conditions. The correctness of the tactic has been confirmed by experimental test results. Finally, the proposed method was implemented in a typical sucker-rod pumping unit (25D-sixty seven-36-American Petroleum Institute), to estimate the rotational speed and slip when the motor is powered by a frequency converter.

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