Design concept of low cost measurement for motor current signature analysis

Name: Satit Owatchaiphong

Organization : King Mongkut's University of Technology North Bangkok. College of Industrial Technology

Email : satit.o@cit.kmutnb.ac.th

keyword: MCSA

ThaSH: Electric currents -- Measurement

; FFT

ThaSH: Total productive maintenance

; P-Welch

ThaSH: Electric motors, Induction

; Interharmonics

ThaSH: Harmonics (Electric waves)

Abstract: This paper presents a concept of low cost current measurement for motor current signature analysis (MCSA). The motor current is measured and then its spectrum is analyzed to estimate the faults. This method is widely accepted for fault diagnostic of induction motors. Since the frequency spectrum of motor current is characterized by different types of faults, the sampling frequency must be high enough to get adequate information from motor current for all cases of fault. In addition to sampling frequency, the measuring time must be long enough to collect data to differentiate the fundamental frequency and interharmonics which are relatively closed to each other. Therefore, using high sampling frequencies results in a large memory required for storing measured data and a powerful processor to handle the large amount of data. It leads to increase the cost of measurement The design concept is proposed an optimal sampling frequency and measuring time for the measurement by using multi sampling frequencies suitable for the frequency spectrum of each faults. In this paper, there are two sampling rates, a low sampling rate to handle low frequency spectrum and the other for high frequency spectrum. Spectrum analysis is performed to the sampled current signals by fast Fourier transform (FFT) and Welch’s technique. The comparison between the high sampling frequencies and the proposed frequency presents the performance of the proposed concept.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2018

Modified: 2025-10-28

Issued: 2025-10-28

บทความ/Article

application/pdf

BibliograpyCitation : In King Mongkut's University of Technology North Bangkok College of Industrial Technology. The Proceedings of the International Conference on Engineering Science and Innovative Technology (ESIT 2018) (058). Bangkok : King Mongkut's University of Technology North Bangkok

eng

©copyrights King Mongkut's University of Technology North Bangkok

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