Premature Wear and Recurring Bearing Failures in an Inverter-Driven Induction Motor—Part I: Investigation of the Problem

Araujo, Romero de Souza; Paula, Hélder de; Rodrigues, Ronaldo de Araujo; Baccarini, Lane Maria Rabelo; Rocha, Anderson V.

doi:10.1109/tia.2015.2456059

Cited by 28 publications

(11 citation statements)

References 17 publications

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“…As the waveform of the measured current is similar to that found in an under-damped resonant circuit submitted voltage step, it can be made approximate by (4).…”

Section: B Determination Of the Series Resonant Equivalent Circuitmentioning

confidence: 71%

“…However, the key issue is the feasibility of the methods presented to solve a real problem. An induction motor, applied to a real annealing and pickling line for processing steels, presenting premature and recurring deterioration of bearings as a result of electric current flow, was investigated in [4] and has motivated the undertaking of the present work; for the sake of information, its characteristics are presented in Table I. However, it should be highlighted that such problem is likely to happen in all applications with inverter driven induction motors, specially those which employ long cables connecting the inverter to the motor, as the case of mining industries.…”

Section: A Motivationmentioning

confidence: 99%

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Premature wear and recurring bearing failures in an inverter driven induction motor— Part II: The proposed solution

Araujo¹,

Rodrigues²,

Paula

et al. 2013

2013 IEEE Industry Applications Society Annual Meeting

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In a previous work, a real case of recurring bearing failures in an induction motor had been extensively studied. As a result, the cause of the problem was revealed to be the circulation of electric current through the bearings. In this way, the present paper deals with the high-frequency leakage currents in AC motors fed by PWM inverters, contextualized in the analysis of an actual case. From the parameters of an equivalent circuit in terms of cables, motor and inverter return path, a filter, characterized by a common-mode transformer, is proposed to mitigate the common-mode quantities and the correlated problem. Both simulated and experimental results show that the proposed solution represents an advantageous alternative in comparison to the traditional RC and RLC filters, since, in addition to its effect on the common-mode quantities, it dissipates a negligible amount of power.

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“…As the waveform of the measured current is similar to that found in an under-damped resonant circuit submitted voltage step, it can be made approximate by (4).…”

Section: B Determination Of the Series Resonant Equivalent Circuitmentioning

confidence: 71%

Section: A Motivationmentioning

confidence: 99%

Premature wear and recurring bearing failures in an inverter driven induction motor— Part II: The proposed solution

Araujo¹,

Rodrigues²,

Paula

et al. 2013

2013 IEEE Industry Applications Society Annual Meeting

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since its output voltage contains a common mode component with variations in steps, the corresponding high dv/dt's excite all the distributed motor intrinsic capacitances to ground, resulting in high-frequency current circulation. Thus, if the motor and/or the load bearings are part of their paths, such current flow can cause serious problems to these parts [1,2]. The damaging process involves microerosion (pitting) generation over the bearing raceway surfaces and, in a more advanced stage, the establishment of a fluting pattern, latter on culminating in the bearing destruction.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic shielding for bearings discharge currents attenuation: analysis of its effectiveness, losses and impact on the motor performance – a study for design guidelines

Êvo

Paula

2020

IET Electric Power Applications

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The authors deal with the use of electrostatic shielding to mitigate the electric discharge machining (EDM) currents on the induction machine bearings. Employing 2D and 3D models, several finite element analysis (FEA) simulations were thoroughly made addressing the shielding effectiveness to attenuate the shaft-to-frame voltage and the associated eddy current losses for different shield widths, thicknesses and materials. The obtained results provide very good guidelines for the practical design of the shielding device. In addition, comparisons between frequency-and time-domain models highlight the importance of considering factors such as the saturation of the iron core, the rotor movement and non-sinusoidal sources to compute the eddy current losses in the shield. Besides, the authors present a comprehensive theoretical review of the EDM currents, where the main influencing factors and action mechanisms are compiled in a clear and didactic approach, for the purpose of broad comprehension.

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“…CMCs can damage the bearings causing premature motor failure. This problem has been thoroughly studied and modeled [4,5], and many solutions have been proposed to reduce or compensate for its effects, including common-mode transformers [6] and active filters [7,8].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Efficiency and Reliability of Wide Band-Gap Based H8 Inverter in Electric Vehicle Applications

Concari¹,

Barater

Toscani

et al. 2019

Energies

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This paper analyzes the performance of a three-phase converter architecture with a reduced common mode voltage to be used in electric motor drives. Starting from the classical three-phase bridge architecture, two additional switches are inserted in the DC link, in order to decouple the source from the load during the freewheeling intervals. Ad-hoc modulation strategies are introduced and evaluated against the classical three-phase space vector modulation. Three main parameters are analyzed: common mode voltage, efficiency and reliability. Experimental measurements on a converter prototype are used to evaluate the common mode performance. The efficiency in the case of Si-IGBT and SiC-MOSFETs is experimentally evaluated. Reliability analysis performed with a Coffin-Mason model showed that the higher efficiency offered by the SiC devices allows for a marked extension of the lifetime.

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Premature Wear and Recurring Bearing Failures in an Inverter-Driven Induction Motor—Part I: Investigation of the Problem

Cited by 28 publications

References 17 publications

Premature wear and recurring bearing failures in an inverter driven induction motor— Part II: The proposed solution

Premature wear and recurring bearing failures in an inverter driven induction motor— Part II: The proposed solution

Electrostatic shielding for bearings discharge currents attenuation: analysis of its effectiveness, losses and impact on the motor performance – a study for design guidelines

Assessment of Efficiency and Reliability of Wide Band-Gap Based H8 Inverter in Electric Vehicle Applications

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Premature Wear and Recurring Bearing Failures in an Inverter-Driven Induction Motor—Part I: Investigation of the Problem

Cited by 28 publications

References 17 publications

Premature wear and recurring bearing failures in an inverter driven induction motor&#x2014; Part II: The proposed solution

Premature wear and recurring bearing failures in an inverter driven induction motor&#x2014; Part II: The proposed solution

Electrostatic shielding for bearings discharge currents attenuation: analysis of its effectiveness, losses and impact on the motor performance – a study for design guidelines

Assessment of Efficiency and Reliability of Wide Band-Gap Based H8 Inverter in Electric Vehicle Applications

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Premature wear and recurring bearing failures in an inverter driven induction motor— Part II: The proposed solution

Premature wear and recurring bearing failures in an inverter driven induction motor— Part II: The proposed solution