Insulation performance evaluation of high temperature wire candidates for aerospace electrical machine winding application

Fang, Le; Cotton, Ian; Wang, Z. J.; Freer, Robert

doi:10.1109/eic.2013.6554244

Cited by 21 publications

(7 citation statements)

References 1 publication

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“…Reliability has become an important issue in the electrical engineering field since the most critical industries, such as urban transports, aeronautics, or space, are moving towards the design of more electrical based systems that will replace heavy mechanical and pneumatic based ones. Such design offers significant benefits in terms of performance, impact on environment, and operating costs [1]. However, more electrical power has to be generated in these systems, requiring higher voltages and operating frequencies [2].…”

Section: Introductionmentioning

confidence: 99%

Parametric and Nonparametric Models for Lifespan Modeling of Insulation Systems in Electrical Machines

Salameh

Picot

Chabert

et al. 2017

IEEE Trans. on Ind. Applicat.

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This paper describes an original statistical approach for the lifespan modeling of electric machine insulation materials. The presented models aim to study the effect of three main stress factors (voltage, frequency and temperature) and their interactions on the insulation lifespan. The proposed methodology is applied to two different insulation materials tested in partial discharge regime. Accelerated ageing tests are organized according to experimental optimization methods in order to minimize the experimental cost while ensuring the best model accuracy. In addition to classical parametric models, the life-stress relationship is expressed through original non-parametric and hybrid models that have never been investigated in insulation aging studies before. These two models present the original contribution of this paper. For each material, models are computed from organized sets of experiments and applied on a randomly configured test set for validity checking. The different models are evaluated and compared in order to define their optimal use.

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Section: Introductionmentioning

confidence: 99%

Parametric and Nonparametric Models for Lifespan Modeling of Insulation Systems in Electrical Machines

Salameh

Picot

Chabert

et al. 2017

IEEE Trans. on Ind. Applicat.

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“…In order to adopt high current loading and achieve a high power density, instead of Class H, enamelled copper magnet wire (rated to 180 o C) or high-temperature versions of enamelled (polyimide) copper magnet wire (up to 245•C), stainless steel (e.g. Nickel) clad copper wire with ceramic fibre insulation is the most readily available option, with maximum operation temperatures up to 700 o C, can be used [43]. But, due to the ceramic insulation, the minimum bend radius of this type of wire is large.…”

Section: Initial Consideration On Operational Environment and Design Materialsmentioning

confidence: 99%

Design Optimization of a Short-Term Duty Electrical Machine for Extreme Environment

Arumugam¹,

Amankwah

Walker

et al. 2017

IEEE Trans. Ind. Electron.

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This paper presents design optimisation of a short term duty electrical machine for extreme environments of high temperature and high altitudes. For such extreme environmental conditions of above 80 o Celsius and altitudes of 30km, thermal loading limits are a critical consideration in machines, especially if high power density and high efficiency are to be achieved. The influence of different material on the performance of such machines is investigated. Also the effect of different slot and pole combinations are studied for machines used for such extreme operating conditions but with short duty. In the research, A Non-dominated Sorting Genetic Algorithm (NSGAII) considering an analytical electromagnetic model, structural and thermal model together with Finite Element (FE) methods are used to optimise the design of the machine for such environments achieving high efficiencies and high power density with relatively minimal computational time. The adopted thermal model is then validated through experiments and then implemented within the Genetic Algorithm (GA). It is shown that, generally, the designs are thermally limited where the pole numbers are limited by volt-amps drawn from the converter. The design consisting of a high slot number allows for improving the current loading and thus, significant weight reduction can be achieved.

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“…In [19], the impact of pressure on the twisted pair winding wires that are insulated by Kapton ® PI film is evaluated. The results show a 50% decrease in PD inception voltage when the pressure drops from 1 Bar to 0.1 Bar.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Partial Discharge Activities in WBG Power Converters under Low-Pressure Condition

Borghei

Ghassemi

2021

Energies

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Many sectors, such as transportation systems, are undergoing rapid electrification due to the need for the mitigation of CO2 emissions. To ensure safe and reliable operation, the electrical equipment must be able to work under various environmental conditions. At high altitudes, the low pressure can adversely affect the health of insulating materials of electrical systems in electric aircraft. A well-known, primary aging mechanism in dielectrics is partial discharge (PD). This study targets internal PD evaluation in an insulated-gate bipolar transistor (IGBT) module under low-pressure conditions. The estimation of electric field distribution is conducted through 3D finite element analysis (FEA) using COMSOL Multiphysics®. The procedure of PD detection and transient modeling is performed in MATLAB for two pressure levels (atmospheric and half-atmospheric). The case study is the IGBT module with a void or two voids in the proximity of triple joints. The single-void case demonstrates that at half-atmospheric pressure, the intensity of discharges per voltage cycle increases by more than 40% compared to atmospheric pressure. The double-void case further shows that a void that is harmless at sea level can turn into an additional source of aging and couple with the other voids to escalate PD intensity by a factor of two or more.

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Insulation performance evaluation of high temperature wire candidates for aerospace electrical machine winding application

Cited by 21 publications

References 1 publication

Parametric and Nonparametric Models for Lifespan Modeling of Insulation Systems in Electrical Machines

Parametric and Nonparametric Models for Lifespan Modeling of Insulation Systems in Electrical Machines

Design Optimization of a Short-Term Duty Electrical Machine for Extreme Environment

Characterization of Partial Discharge Activities in WBG Power Converters under Low-Pressure Condition

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