Recognition of Stator Winding Inter-Turn Fault in Interior-Mount LSPMSM Using Acoustic Signals

Luqman S Maraaba,Ssennoga Twaha,Azhar Memon,Zakariya Al-Hamouz

doi:10.3390/sym12081370

Abstract

This paper presents a novel stator inter-turn fault diagnosis method for Line Start Permanent Magnet Synchronous Motors (LSPMSMs) using the frequency analysis of acoustic signals resulting from asymmetrical faults. In this method, acoustic data are experimentally collected from a 1 hp interior mount LSPMSM for different inter-turn fault cases and motor loading levels, while including the background noise. The signals are collected using a smartphone at a sampling rate of 48,000 samples per second. The signal for each case is analyzed using fast Fourier transform (FFT), which results in the decomposition of the signal into its frequency components. The results indicate that, for both no-load and full-load conditions, 39 components are observed to be affected by the faults, whereby their amplitudes increase with the fault severity. The 40-turns fault shows the highest difference in the component amplitudes compared with the healthy condition acoustic signal. Therefore, this diagnostic method is able to detect the stator inter-turn fault for interior mount LSPMSMs. Moreover, the method is simple and cheap since it uses a readily available sensor.

Highlights

Electric motors play a crucial role in industry as they are used to run different industrial processes during the manufacturing of different products
To analyze the effectiveness of the acoustic signal in detecting the occurrence of an inter-turn fault at its early stages as well as analyzing the effect of the fault on the generated sound, the acoustic signals for the different fault severities with different background noise were collected using a smartphone at
This paper presents a novel stator inter-turn fault diagnosis method for Line Start Permanent Magnet Synchronous Motors (LSPMSMs) using the frequency analysis of the acoustic signals resulting from the faults

Summary

Introduction

Electric motors play a crucial role in industry as they are used to run different industrial processes during the manufacturing of different products. In oil and gas, induction motors are gradually being substituted by line-start permanent magnet synchronous motors (LSPMSMs) [2]. The LSPMSM has several advantages over other motors, including being high-efficiency, having a power factor within a wide load range, and being equipped with a squirrel cage that rotates the rotor from standstill, with magnets that help the motor to maintain a synchronous speed. Inter-turn faults, broken bars, eccentricity, and demagnetization are some of the main failures. Based on Electric Power Research Institute (EPRI) and IEEE studies, insulation breakdown is the main cause of inter-turn faults [3,4]. Normal manufacturing processes and operation are affected by such failures, as these result in the loss of revenue due to a reduced volume and Symmetry 2020, 12, 1370; doi:10.3390/sym12081370 www.mdpi.com/journal/symmetry

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