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Energies
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Design for Reliability in Rotating Electrical Machines: Insulation Degradation and...
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Design for Reliability in Rotating Electrical Machines: Insulation Degradation and Lifetime Consumption

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A: Sustainable Energy".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 6940

Special Issue Editors

Prof. Michael Galea

E-Mail Website
Guest Editor
Aerospace Technology Center, University of Nottingham, Innovative Park, Nottingham NG7 2TU, UK
Interests: design and development of electrical machines and drives (classical and unconventional); reliability and lifetime degradation of electrical machines; more electric aircraft
Special Issues, Collections and Topics in MDPI journals
Dr. Paolo Giangrande

E-Mail Website
Guest Editor
University of Nottingham, Aerospace Technology Center, Innovative Park, Nottingham NG7 2TU, UK
Interests: design of electromechanical actuators for aerospace; thermal management of high-performance electric drives; lifetime modelling of electrical machines

Special Issue Information

Dear Colleagues,

The move towards transportation electrification has made reliability considerations of electrical machines a stringent and predominant requirement. Failures can cause severe downtime and economic losses, as well as endanger human lives. Especially in the automotive and aerospace sectors, electrical machines are required to simultaneously deliver high performance while guaranteeing the appropriate reliability considerations.

It is clear that reliability must be a design objective from the very beginning of the design process. A bottleneck for failure of electrical machines is the insulation system. As power density values continue to improve through modern enabling technologies, their adoption can trigger undesired insulation ageing and degradation, compromising its dielectric properties. Therefore, adequate insulation design is needed to promote and enhance electric drive reliability at both the component and system levels.

This Special Issue will present scientific papers dealing with design for the reliability of electrical machines with special focus on the machine insulation system and the impact of their main ageing/stress factor. Articles on machine design, ageing mechanisms, lifetime degradation modelling, partial discharge detection and modelling, fault‑tolerant systems, real‑time fault detection, and diagnostics methodologies are invited for submission. Original research and practical contributions as well as surveys and state-of-the-art tutorials are welcome.

Prof. Michael Galea
Dr. Paolo Giangrande
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • design of experiments
  • accelerated ageing tests
  • dielectric breakdown
  • thermal, electrical, mechanical and environmental stresses
  • electrical machine insulation
  • physics of failure
  • lifetime modelling
  • detection and modelling of partial discharge
  • inverter-fed machine
  • insulation design

Published Papers (2 papers)

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Review

25 pages, 5275 KiB  
Review
Reliability-Oriented Design of Inverter-Fed Low-Voltage Electrical Machines: Potential Solutions
by Yatai Ji, Paolo Giangrande, Vincenzo Madonna, Weiduo Zhao and Michael Galea
Energies 2021, 14(14), 4144; https://doi.org/10.3390/en14144144 - 9 Jul 2021
Cited by 7 | Viewed by 2730
Abstract
Transportation electrification has kept pushing low-voltage inverter-fed electrical machines to reach a higher power density while guaranteeing appropriate reliability levels. Methods commonly adopted to boost power density (i.e., higher current density, faster switching frequency for high speed, and higher DC link voltage) will [...] Read more.
Transportation electrification has kept pushing low-voltage inverter-fed electrical machines to reach a higher power density while guaranteeing appropriate reliability levels. Methods commonly adopted to boost power density (i.e., higher current density, faster switching frequency for high speed, and higher DC link voltage) will unavoidably increase the stress to the insulation system which leads to a decrease in reliability. Thus, a trade-off is required between power density and reliability during the machine design. Currently, it is a challenging task to evaluate reliability during the design stage and the over-engineering approach is applied. To solve this problem, physics of failure (POF) is introduced and its feasibility for electrical machine (EM) design is discussed through reviewing past work on insulation investigation. Then the special focus is given to partial discharge (PD) whose occurrence means the end-of-life of low-voltage EMs. The PD-free design methodology based on understanding the physics of PD is presented to substitute the over-engineering approach. Finally, a comprehensive reliability-oriented design (ROD) approach adopting POF and PD-free design strategy is given as a potential solution for reliable and high-performance inverter-fed low-voltage EM design. Full article
(This article belongs to the Special Issue Design for Reliability in Rotating Electrical Machines: Insulation Degradation and Lifetime Consumption)
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32 pages, 940 KiB  
Review
Insulation Life Span of Low-Voltage Electric Motors—A Survey
by Vanessa Neves Höpner and Volmir Eugênio Wilhelm
Energies 2021, 14(6), 1738; https://doi.org/10.3390/en14061738 - 21 Mar 2021
Cited by 17 | Viewed by 3537
Abstract
The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial [...] Read more.
The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered. Full article
(This article belongs to the Special Issue Design for Reliability in Rotating Electrical Machines: Insulation Degradation and Lifetime Consumption)
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