Speed ripple analysis for a fault induction machines using current spectrum analysis

2014 ◽  
Author(s):  
A. Belgacem ◽  
Y. Ben Salem ◽  
M.N. Abdelkrim
Keyword(s):  
Spectrum Analysis ◽  
Induction Machines ◽  
Current Spectrum

Stator-Current Spectrum Signature of Healthy Cage Rotor Induction Machines

2013 ◽  
Vol 60 (9) ◽  
pp. 4025-4033 ◽  
Author(s):  
Gojko M. Joksimovic ◽  
Jaksa Riger ◽  
Thomas M. Wolbank ◽  
Nedjeljko Peric ◽  
Mario Vasak
Keyword(s):  
Induction Machines ◽  
Stator Current ◽  
Current Spectrum ◽  
Cage Rotor

scholarly journals Cost-Effective Reduced Envelope of the Stator Current via Synchronous Sampling for the Diagnosis of Rotor Asymmetries in Induction Machines Working at Very Low Slip

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3471 ◽  
Author(s):  
Jordi Burriel-Valencia ◽  
Ruben Puche-Panadero ◽  
Javier Martinez-Roman ◽  
Angel Sapena-Bano ◽  
Manuel Pineda-Sanchez
Keyword(s):  
Fault Diagnosis ◽  
Low Cost ◽  
Computing Time ◽  
Low Frequency ◽  
Cost Effective ◽  
Induction Machines ◽  
Minimal Amount ◽  
Stator Current ◽  
Current Spectrum ◽  
On Line

Fault diagnosis of rotor asymmetries of IM using the stator current relies on the detection of the characteristic signatures of the fault harmonics in the current spectrum. In some scenarios, such as large induction machines running at a very low slip, or unloaded machines tested offline, this technique may fail. In these scenarios, the fault harmonics are very close to the frequency of the fundamental component, and have a low amplitude, so that they may remain undetected, buried under the fundamental’s leakage, until the damage is severe. To avoid false positives, a proven approach is to search for the fault harmonics in the current envelope, instead of the current itself, because in this case the spectrum is free from the leakage of the fundamental. Besides, the fault harmonics appear at a very low frequency. Nevertheless, building the current spectrum is costly in terms of computing complexity, as in the case of the Hilbert transform, or hardware resources, as in the need for simultaneously sampling three stator currents in the case of the EPVA. In this work, a novel method is proposed to avoid this problem. It is based on sampling a phase current just twice per current cycle, with a fixed delay with respect to its zero crossings. It is shown that the spectrum of this reduced set of current samples contains the same fault harmonics as the spectrum of the full-length current envelope, despite using a minimal amount of computing resources. The proposed approach is cost-effective, because the computational requirements for building the current envelope are reduced to less than 1 % of those required by other conventional methods, in terms of storage and computing time. In this way, it can be implemented with low-cost embedded devices for on-line fault diagnosis. The proposed approach is introduced theoretically and validated experimentally, using a commercial induction motor with a broken bar under different load and supply conditions. Besides, the proposed approach has been implemented on a low-cost embedded device, which can be accessed on-line for remote fault diagnosis.

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