The Impact of Thermal Degradation on Properties of Electrical Machine Winding Insulation Material

Sumisławska, Malgorzata; Gyftakis, Konstantinos N.; Kavanagh, Darren F.; McCulloch, Malcolm; Burnham, Keith J.; Howey, David A.

doi:10.1109/tia.2016.2544745

Cited by 52 publications

(19 citation statements)

References 30 publications

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“…Electrical insulation materials in machines are subjected to a multitude of stresses over the course of their lifetime, including thermal, electrical, ambient (e.g. environmental or chemical) and mechanical factors [6], [7], [8], [9], [4]. Sometimes these are abbreviated as 'TEAM' [3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Degradation Phenomena of Polymer Film on Magnet Wire for Electromagnetic Coils

Kavanagh

Gyftakis

McCulloch

2021

IEEE Trans. on Ind. Applicat.

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Polymer film insulation degradation is a major problem for electric machines which leads to short circuits, overheating and eventually the occurrence of catastrophic failure. Electrical insulation materials provide the vital function of turn-to-turn, phase to phase, and phase-to-ground electrical isolation for the electromagnetic coils and windings. This paper investigates the characterisation of early-onset degradation of thin-film magnet wire insulation at elevated temperatures from 200 to 275 • C. Sample specimens were analysed after ageing for 100 hours in terms of their physical properties [surface roughness, mass], chemical properties [Fourier Transform Infra-Red (FTIR) spectroscopy], dielectric properties [capacitance and dissipation factor] and electrical properties [voltage breakdown strength and resistance]. The results show that the specimen roughness and mass increase and decrease uniformly, respectively, with increased ageing temperature. Similar degradation results trends with respect to ageing temperature for the dielectric properties and electrical insulation strength is documented. The paper also reports an extended ageing study which investigates early breakdown voltage (EBV) on sample specimens over a much longer time duration, that of up to 1600 hours.

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Section: Introductionmentioning

confidence: 99%

Thermal Degradation Phenomena of Polymer Film on Magnet Wire for Electromagnetic Coils

Kavanagh

Gyftakis

McCulloch

2021

IEEE Trans. on Ind. Applicat.

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“…Torque raising will lead to a sharp increase in the copper loss and the winding temperature. The winding insulation is sensitive to the temperature, and the winding insulation lifetime will be heavily reduced by the thermal-aging degradation effect [10][11][12]. There is a risk of overheating in winding if the torque is excessively raised, which will reduce the reliability of the motor [13,14].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Dual‐Redundancy PM Brushless DC Motors for Torque Enhancement

Dong

Jiang

et al. 2020

IEEJ Transactions Elec Engng

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Non-member Zili He, Non-member Jinghui Xu, Non-member To enhance the torque of short-time duty permanent magnet (PM) dual-redundancy brushless DC motors (DR-BLDCM) and avoid the motor overheating under a fixed outer diameter and length, a design method based on the optimization of split ratio and stator magnetic density (B m) considering thermal limitations is presented. The global thermal limitation of DR-BLDCM is set by limiting loss density. The local thermal limitation of the winding is set by limiting current density. The thermal limitations are taken as the boundary of torque enhancement design optimization. Both the cold backup and hot backup DR-BLDCM are studied in this paper. By researching the relationship between torque, split ratio, and B m , the optimal combination of split ratio and B m are calculated analytically. The influences of thermal limitations on the maximum torque and the optimal combination are analyzed, and the principle to determine the optimal combination is obtained. The analytically calculated results are verified by finite element simulation, and the error is less than 6.82%. A prototype is manufactured based on analytical design results. The error between the calculated and measured copper loss is 6.96%. The verification results show that the proposed optimization method can fully enhance the torque of DR-BLDCM under the condition of fixed overall dimension and thermal limitations.

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“…Additionally, an equivalent circuit model of induction motors was presented in [17] to account for thermal stress. In [18]- [19] the impact of thermal degradation on the dielectric properties of thin film insulation material used for windings of traction electric motors has been studied. Finally, the authors of [20] compare different methods for evaluating the relative importance of variables involved in insulation lifespan models using twisted pairs under different stress constraints.…”

Section: Introductionmentioning

confidence: 99%

Breakdown resistance analysis of traction motor winding insulation under thermal ageing

Gyftakis

Panagiotou

Lophitis

et al. 2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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Stator inter-turn faults are among the most important electric motor failures as they progress fast and lead to catastrophic motor breakdowns. Inter-turn faults are caused due to the windings' insulation degradation. The main stress which deteriorates the insulation is the thermal one. Proper understanding of how this stress influences the electrical properties of insulation over time may lead to reliable prognosis and estimation of the motor's remaining useful life. In transport applications where reliability and safety come first it is a critical issue. In this paper, extensive experimental testing and statistical analysis of thin film insulation for traction motor windings has been performed under fixed thermal stress. The results indicate that for high thermal stress the electrical properties of the insulation material present a non-monotonic behavior thus proving the well-known and established Arrhenius law inadequate for modelling this type of problems and estimating the remaining useful life of thin film insulation materials.

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The Impact of Thermal Degradation on Properties of Electrical Machine Winding Insulation Material

Cited by 52 publications

References 30 publications

Thermal Degradation Phenomena of Polymer Film on Magnet Wire for Electromagnetic Coils

Thermal Degradation Phenomena of Polymer Film on Magnet Wire for Electromagnetic Coils

Design Optimization of Dual‐Redundancy PM Brushless DC Motors for Torque Enhancement

Breakdown resistance analysis of traction motor winding insulation under thermal ageing

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