Improved electromagnetic coil insulation health monitoring using equivalent circuit model analysis

Jameson, N. Jordan; Azarian, Michael H.; Pecht, Michael

doi:10.1016/j.ijepes.2020.105829

Cited by 10 publications

(9 citation statements)

References 41 publications

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“…That is, the conversion process of measured S-parameter to the renormalized S-parameter can be obtained using Equation (11). Note that Γ is a diagonal reflection coefficient matrix from Z 0 (G) and Z new (G new ).…”

Section: Renormalization Technique Of An S-parametermentioning

confidence: 99%

“…To detect and classify the states of soft failure in the winding, both modeling and experimental studies about the aging effect of the solenoid have been conducted. Recently, an experimental analysis reported on the relationship between solenoid impedance and aging effects in insulation coating using an accelerated deterioration [10][11][12]. The circuit model-based approach can be powerful for estimating operation torque and the corresponding waveform of current; however, it has shortcomings for analyzing and detecting insulator degradation because it uses only equivalent lumped elements.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of Insulator Degradation in a Single Layer Solenoid by Renormalization of the Transmission Parameter

et al. 2020

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In this paper, a novel method to quantitatively analyze insulator degradation in a single layer solenoid is proposed. The suggested method employs renormalization of scattering parameters to efficiently detect changes of permittivity in a degraded solenoid. Firstly, a transmission line model, including a locally degraded part in the insulator, was developed, and it was determined that the phase information of the transmission parameter was very informative to check the permittivity change in the transmission line. To check the workability of this idea in a solenoid, a 30-turn single-layer solenoid was designed and fabricated, and 51 degraded states for mimicking insulation deterioration in each turn were introduced by installing additional insulator rings, which increased local relative permittivity. The phase data of the measured transmission parameter turned out to be useful for quantifying changes of the insulator in the solenoid. To maximize the detectability, the measured scattering parameters were renormalized with different reference impedances, which was very useful for detecting degradation in the transmission parameter. In this paper, detailed procedures for quantitatively analyzing degradation of an insulator are proposed and we verify that the suggested renormalization technique is very promising for effectively evaluating the degradation of a solenoid.

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Section: Renormalization Technique Of An S-parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Insulator Degradation in a Single Layer Solenoid by Renormalization of the Transmission Parameter

et al. 2020

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“…Electromagnetic coils are widely used in industry energy conversion applications such as motors, solenoids, relays, and transformers [1]. Oak Ridge National Laboratory [2] collected the failure data of solenoid valves used in the safety protection system of commercial nuclear power plants in the United States for a period of 10 years and the results show that more than 50% of the solenoid valve failures are related to the insulation failure of solenoid coils.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the effectiveness of the method is proved by offline and online tests. Jameson et al [1] found that the frequency characteristics in the impedance spectrum are more sensitive to the insulation health state than the resonance frequency based on equivalent circuit theory and aging test data. In summary, winding HFERP, such as parasitic capacitance, resonant frequency and impedance, are used for insulation health assessment in the current literature.…”

Section: Introductionmentioning

confidence: 99%

Health assessment for low-voltage electromagnetic coils based on fusion of creep degradation mechanism and transformed MD

Yue,

Kai,

Aidong

et al. 2023

Meas. Sci. Technol.

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Low-voltage electromagnetic coils play ever-increasing roles in safety-critical systems, like electromechanical actuators in more electric aircraft and tractors in zero emission vehicles. Identifying insulation degradation prior to the formation of turn-to-turn short can effectively avoid accidental shutdown and enable predictive maintenance for these systems. High-frequency electrical response analysis is currently a promising technique for electromagnetic coil insulation health assessment. However, the correlation between high-frequency electrical response parameters (HFERP) and actual insulation degradation status (AIDS) is still not clear, which brings challenges in insulation health assessment and remaining useful life prediction. Therefore, in this paper, a fusion method based on creep degradation mechanism and transformed mahalanobis distance (MD) for insulation health assessment is proposed. First, correlation analysis between the coil HFERP and the AIDS is performed from coil insulation coating creep degradation point of view. Second, a coil on-line monitoring parameter (OLMP) for monitoring insulation degradation status on-site is constructed based on transformed MD. A correlation model between OLMP and AIDS is consequently built to assist in determining OLMP failure threshold for coil insulation health assessment. Coil accelerated testing shows that the fusion method can be used to assess insulation status prior to the formation of harmful shorts, enabling condition-based maintenance for components or systems that incorporate electromagnetic coils.

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“…Perisse et al [ 33 ] set a failure threshold of 95% of the healthy coil resonant frequency and mentioned that once the failure threshold is crossed, the coil should be maintained under monitoring. However, the experimental results in Jameson et al [ 42 ] showed that the resonant frequency changed by only 2.5% before a short formed.…”

Section: Introductionmentioning

confidence: 99%

Degradation Monitoring of Insulation Systems Used in Low-Voltage Electromagnetic Coils under Thermal Loading Conditions from a Creep Point of View

Wang

Guo

et al. 2020

Sensors

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Electromagnetic coils are a key component in a variety of systems and are widely used in many industries. Because their insulation usually fails suddenly and can have catastrophic effects, degradation monitoring of coil insulation systems plays a vital role in avoiding unexpected machine shutdown. The existing insulation degradation monitoring methods are based on assessing the change of coil high-frequency electrical parameter response, whereas the effects of the insulation failure mechanisms are not considered, which leads to inconsistency between experimental results. Therefore, this paper investigates degradation monitoring of coil insulation systems under thermal loading conditions from a creep point of view. Inter-turn insulation creep deformation is identified as a quantitative index to manifest insulation degradation changes at the micro level. A method is developed to map coil high-frequency electrical monitoring parameters to inter-turn insulation creep deformation in order to bridge the gap between the micro-level and macro-level changes during the incipient insulation degradation process. Thermally accelerated tests are performed to validate the developed method. The mapping method helps to determine the physical meaning of coil electrical monitoring parameters and presents opportunities for predictive maintenance of machines that incorporate electromagnetic coils.

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Improved electromagnetic coil insulation health monitoring using equivalent circuit model analysis

Cited by 10 publications

References 41 publications

Quantitative Analysis of Insulator Degradation in a Single Layer Solenoid by Renormalization of the Transmission Parameter

Quantitative Analysis of Insulator Degradation in a Single Layer Solenoid by Renormalization of the Transmission Parameter

Health assessment for low-voltage electromagnetic coils based on fusion of creep degradation mechanism and transformed MD

Degradation Monitoring of Insulation Systems Used in Low-Voltage Electromagnetic Coils under Thermal Loading Conditions from a Creep Point of View

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