Electrical characterization of bearing lubricants

Joshi, Abhishek; Blennow, Jörgen

doi:10.1109/ceidp.2014.6995856

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…Under high-temperature conditions, various substances are released in oil, and if the bearings are worn out, detection of small particles/impurities in oil, caused by the contacting elements, is possible. Analysis of bearing oil electrical properties are investigated [9]. Therefore, the method can only be applied to large motors (50 kW and more) with forced bearing lubrication.…”

Section: Review Of Methodsmentioning

confidence: 99%

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Generalized Roughness Bearing Faults Diagnosis Based on Induction Motor Stator Current

Andrijauskas¹,

Vaitkunas²,

Adaškevičius³

2018

RADIOENGINEERING

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Despite their reliability, induction motors tend to fail. Around 41% of faults in motors are bearing related and that is the most common fault in motor field. Due to the lack of research on generalized roughness bearing fault diagnostics by use of a stator current spectrum, the presented study analyses both single-point and generalized roughness bearing faults and their classification possibilities. In this paper, a new method for generalized roughness ball bearing fault identification by use of a stator current signal analysis is presented. The algorithm relies on Discrete Wavelet Transform and Welch's spectral density analysis. The composition of both methods is used for building a feature vector for the classifier. In order to achieve classification, support vector machine classifier with linear kernel function has been applied. The validation experiment and results are presented.

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Section: Review Of Methodsmentioning

confidence: 99%

“…Accuracy represents the ratio of correctly classified versus the whole population (8). Sensitivity (9) and specificity (10), respectively, is the ratio of healthy identified as healthy and faulty identified as faulty. In literature sensitivity and specificity may be referred as True Positive Rate (TPR) and True Negative Rate (TNR).…”

Section: Methodsmentioning

confidence: 99%

Generalized Roughness Bearing Faults Diagnosis Based on Induction Motor Stator Current

Andrijauskas¹,

Vaitkunas²,

Adaškevičius³

2018

RADIOENGINEERING

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“…An increased level of conductive particles, such as iron, can alter the dielectric strength of the lubricant [21]. A change in the electric properties of the lubricant changes the potential influence of stray currents on the formation of WEC [22]. The investigations by Kohara, Kawamura and Egami have shown that, with the exception of PFPE, all lubricants interact with bare (freshly produced) steel surfaces.…”

Section: Kohara Et Al Analysed Various Base Lubricants In the Context...mentioning

confidence: 99%

Chemical factors for premature failures of roller bearings in wind turbines due to white etching cracks: A review from literature and industry experience

Harling,

Jacobs,

Lehmann

2024

J. Phys.: Conf. Ser.

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This paper investigates the chemical influencing factors leading to premature bearing failures in wind turbine gearboxes. Chemical factors like the lubricant composition and the boundary layer of the bearing material play a crucial role in enabling premature failures caused by white etching cracks (WEC). They are then eventually triggered by energy input due to mechanical or electrical loads. Even though reproducing WEC on test rigs (e.g. FE8 test rig or three-disc-tribometer) is possible a reproduction or transfer of the knowledge to full-size test rigs or real systems remains challenging. This is due to the system-specific contact conditions which result from the respective loads, the bearing geometry and the chemical influencing factors. To collect the industry’s perspective on chemical influencing factors and their significance in the field, the state of the art was analysed and based on the results a survey was prepared. The survey interviews are conducted among leading manufacturers of lubricants, bearings, gearboxes and OEMs in the wind energy sector. From those results the influence of hydrogen, particles and contact temperature were identified as particularly important.

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“…Thus, the CMSN, when designed accordingly, allows the CMI to effectively mitigate CM current over the desired frequency range. In practice, the dielectric thickness between the bearings and the races in an electric machine changes with the machine's speed of rotation [10]. Thus, the parasitic capacitance of the machine changes with speed.…”

Section: Common-mode Mitigation Strategymentioning

confidence: 99%

A Common-Mode Shorting Network to Reduce Common-Mode Excitation of Three-Phase Two-Level Electric Drives

Singh

Sudhoff

2023

IEEE Open J. Power Energy

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Common-mode voltage and current in an electric machine are undesirable. Although the strategic placement of a common-mode inductor and dc input side capacitors may reduce the common-mode current produced by an electric drive system, the effectiveness of this mitigation is a function of machine parasitic capacitance. This engenders the need to insert another electrical component into the system to effectively mitigate the common-mode current. With this purpose, a common-mode shorting network for an inverter-based drive system is proposed in this work. This network, in conjunction with a common-mode inductor and dc input side capacitors, reduces the machine common-mode voltage and current. The proposed approach is experimentally demonstrated.

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Electrical characterization of bearing lubricants

Cited by 7 publications

References 8 publications

Generalized Roughness Bearing Faults Diagnosis Based on Induction Motor Stator Current

Generalized Roughness Bearing Faults Diagnosis Based on Induction Motor Stator Current

Chemical factors for premature failures of roller bearings in wind turbines due to white etching cracks: A review from literature and industry experience

A Common-Mode Shorting Network to Reduce Common-Mode Excitation of Three-Phase Two-Level Electric Drives

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