Diagnosis of electric induction machines in non-stationary regimes working in randomly changing conditions

Santos, Vedreño; José, Francisco

doi:10.4995/thesis/10251/34177

Cited by 4 publications

(2 citation statements)

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“…As a consequence, a set of new components at frequencies (𝑓 𝑘𝑠𝑟 = (1 ± 2 • 𝑘 • 𝑠) • 𝑓 ) 𝑘=0,1,2,... appears in the spectrum of the stator currents and a set of new components at frequencies (𝑓 𝑘𝑟𝑟 = ±(1 + 2 • 𝑘) • 𝑠 • 𝑓) 𝑘=0,1,2,… appears in the spectrum of rotor currents, which are reflected in the external magnetic field [21], [23], [24]. In addition to these fault-related harmonics, reference [25] determines equation (1), which estimates the frequency components amplified in the rotor currents caused by the rotor asymmetry.…”

Section: A Theoretical Fault-related Componentsmentioning

confidence: 99%

“…-Radial components: given by expression (1). These correspond to a family of harmonics amplified by the rotor winding asymmetry in WRIM [20], [25]. For each value of k/p, expression (1) yields a pair of fault harmonics that evolve toward their respective frequencies at steady-state that fall near the corresponding winding harmonic (3 th , 5 th , 7 th …winding harmonic).…”

Section: B Multiple Harmonics Tracking In the Stray-flux Under Startingmentioning

confidence: 99%

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Tracking of High-Order Stray-Flux Harmonics Under Starting for the Detection of Winding Asymmetries in Wound-Rotor Induction Motors

Zamudio-Ramírez

Antonino-Daviu

Osornio

et al. 2022

IEEE Trans. Ind. Electron.

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Wound rotor induction motors (WRIM) are widely used in a vast number of high output power industrial applications due to their capability of reaching high start torques while maintaining low inrush currents. Nonetheless, these machines are very prone to require early maintenance, and the possibility of presenting rotor winding asymmetry failures is high due to their more complex rotor circuit. Although some recent works have proposed techniques that overcome the drawbacks of conventional methods, an additional research effort for the development of alternative approaches able to enhance their performance and reliability is desirable. In this work, a new method for the diagnosis of rotor asymmetries in WRIM is presented. The proposed methodology is based on a feed-forward neural network (FFNN) feed by suitable fault severity indicators, which rely on the maximum energy density of higher order harmonics (amplified by the failure) at strategic regions of the time-frequency maps obtained from stray flux signals under startup transient. Experimental results for three different levels of rotor asymmetries in a 11 KW WRIM prove the reliability of the enhanced proposed system in comparison to conventional approaches that only rely on the main sideband faultharmonic amplitudes.

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Section: A Theoretical Fault-related Componentsmentioning

confidence: 99%

Section: B Multiple Harmonics Tracking In the Stray-flux Under Startingmentioning

confidence: 99%

Tracking of High-Order Stray-Flux Harmonics Under Starting for the Detection of Winding Asymmetries in Wound-Rotor Induction Motors

Zamudio-Ramírez

Antonino-Daviu

Osornio

et al. 2022

IEEE Trans. Ind. Electron.

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Reliable Detection of Rotor Winding Asymmetries in Wound Rotor Induction Motors via Integral Current Analysis

Antonino-Daviu

Quijano-López

Climente-Alarcón

et al. 2017

IEEE Trans. on Ind. Applicat.

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Abstract-Current analysis has been widely employed in academy and industry for the diagnosis of rotor damages in cage induction motors. The conventional approach based on the FFT analysis of steady-state current (MCSA) has been recently complemented with the development of alternative techniques that rely on the time-frequency analysis of transient quantities of the machine. These techniques may bring important advantages that are related to the avoidance of eventual false indications provided by the classical MCSA. Moreover, their application is also suitable for variable speed conditions. However, the application of current-based methodologies to wound rotor induction motors (WRIM) has been much less studied and, hence, their validation in field WRIM is scarce. The present work proposes the application of an integral methodology based on the analysis of both stationary and transient currents for the diagnosis of winding asymmetries in WRIM. The method, based on up to five different fault evidences, is validated in laboratory motors and it is subsequently applied to a large field motor (1,500 kW) that was showing signs of abnormal rotor functioning. The results prove that the method is of interest for the field since it helps to ratify without ambiguity the existence of eventual asymmetries in the rotor windings, with no interference with the machine operation. However, due to the complex constructive nature of the rotor winding as well as the presence of auxiliary systems (slip rings, brushes, contactors, etc…), once the fault presence is detected, it may be interesting the utilization of complementary tools to accurately locate the root cause of the asymmetry.

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Analysis of Rotor Currents Under the Starting for the Detection of Stator Asymmetries in Wound Rotor Induction Motors

Zamudio-Ramírez

Antonino-Daviu

Osornio-Ríos

et al. 2023

IEEE Trans. on Ind. Applicat.

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Diagnosis of electric induction machines in non-stationary regimes working in randomly changing conditions

Cited by 4 publications

References 0 publications

Tracking of High-Order Stray-Flux Harmonics Under Starting for the Detection of Winding Asymmetries in Wound-Rotor Induction Motors

Tracking of High-Order Stray-Flux Harmonics Under Starting for the Detection of Winding Asymmetries in Wound-Rotor Induction Motors

Reliable Detection of Rotor Winding Asymmetries in Wound Rotor Induction Motors via Integral Current Analysis

Analysis of Rotor Currents Under the Starting for the Detection of Stator Asymmetries in Wound Rotor Induction Motors

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