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arXiv · 2608.29214

Sound Analysis for Speed Estimation of Induction Motors Under Non-Stationary Conditions

Tomas A. Garcia-Calva·Daniel Morinigo-Sotelo·Konstantinos N. Gyftakis
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Abstract

This paper presents a novel methodology for the estimation of the rotational speed of induction motors operating under non stationary conditions, using acoustic signals acquired by a low cost microphone. The proposed approach integrates multi rate digital signal processing with advanced time frequency analysis to extract speed dependent harmonic components from motor acoustic emissions, while effectively suppressing electrical interference and electromagnetic noise. Numerical simulations and experimental validations are conducted under both steady state and transient operating conditions, considering a wide variety of speed profiles, including slow ramps and abrupt speed variations. The experimental results demonstrate that the proposed method is capable of accurately tracking rapid and dynamic speed changes caused by load disturbances and mechanical irregularities. The estimated instantaneous speed exhibits a high degree of agreement with reference measurements obtained from a conventional speed sensor. The results confirm that the proposed acoustic based technique provides a reliable, noninvasive, and cost effective solution suitable for speed monitoring of induction motors.

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Tomas A. Garcia-Calva, Daniel Morinigo-Sotelo, Konstantinos N. Gyftakis. 2026-08-29. Sound Analysis for Speed Estimation of Induction Motors Under Non-Stationary Conditions. https://doi.org/10.1109/tia.2026.3728739

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