Electrical machines (EMs) are required to consistently perform their intended mission over a specified timeframe. The move toward transportation electrification made the EMs’ reliability an even stringent and predominant requirement, since a failure might cause severe economic losses, as well as endanger human lives. Traditionally, the design procedure of motors conceived for safety-critical applications mainly relies on over-engineering approaches. However, a paradigm shift is recently taking place and physics of failure approaches/methodologies are employed to meet the reliability figures, while delivering an optimal design. This article proposes and outlines a reliability-oriented design for low-voltage EMs. Thermal accelerated aging tests are preliminarily carried out on custom-built specimens. Once the aging trend of the turn-to-turn insulation system is assessed, the thermal endurance graph at several percentile values is determined and lifetime models are developed, for both constant and variable temperature operations. Finally, these models are used to predict the turn-to-turn insulation lifetime of motors meant for aerospace and automotive applications.

中文翻译：

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通过考虑绝缘热老化因素，转向面向可靠性的低压电机设计方法

电机 (EM) 需要在指定的时间范围内始终如一地执行其预期任务。交通电气化的发展使得 EM 的可靠性成为一项更加严格和主要的要求，因为故障可能会造成严重的经济损失，并危及人类生命。传统上，为安全关键应用设想的电机设计程序主要依赖于过度设计的方法。然而，最近正在发生范式转变，并采用故障方法/方法物理学来满足可靠性数据，同时提供最佳设计。本文提出并概述了一种面向低压 EM 的可靠性设计。热加速老化试验是在定制的试件上初步进行的。一旦评估了匝间绝缘系统的老化趋势，就可以确定几个百分位值的耐热性图，并为恒温和可变温度操作开发寿命模型。最后，这些模型用于预测用于航空航天和汽车应用的电机的匝间绝缘寿命。