Ramin Robin, Montanari Gian Carlo, Yang Qichen
Center for Advanced Power Systems, Florida State University, 2000 Levy Avenue, Tallahassee, FL 32310, USA.
Materials (Basel). 2021 Dec 9;14(24):7555. doi: 10.3390/ma14247555.
Designing the insulation system for motors to be used in electrical aircraft requires efforts for maximizing specific power, but, in parallel, particular attention to achieve high reliability. As a major harm for organic insulation systems is partial discharges, design must be able to infer their likelihood during any operation stage and handle their potential inception. This paper proposes a new approach to carry out optimized or conservative insulation system designs which can provide the specified life at the chosen failure probability as well as look at the option of possibly reducing the risk of partial discharges to zero, at any altitude. Examples of designing turn, phase to ground and phase-to-phase insulation systems are reported, with cases where the design can be optimized and other cases where the optimized design does not pass IEC testing standard. Therefore, the limits for design feasibility as a function of the required level of safety and reliability are discussed, showing that the presence of partial discharges cannot be always avoided even through conservative design criteria. Therefore, the use of advanced, corona-resistant materials must be considered, in order to reach a higher, sometimes redundant, level of reliability.
为电动飞机设计电机绝缘系统需要努力使比功率最大化，但与此同时，要特别关注实现高可靠性。由于局部放电是有机绝缘系统的主要危害，设计必须能够推断其在任何运行阶段发生的可能性，并应对其潜在的起始。本文提出了一种新方法，用于进行优化或保守的绝缘系统设计，该设计能够在选定的失效概率下提供规定的寿命，并考虑在任何高度将局部放电风险降至零的可能性。报告了匝间、相对地和相间绝缘系统的设计示例，包括设计可优化的情况以及优化设计未通过IEC测试标准的情况。因此，讨论了作为所需安全和可靠性水平函数的设计可行性极限，表明即使通过保守的设计标准，也无法始终避免局部放电的存在。因此，必须考虑使用先进的抗电晕材料，以达到更高的、有时是冗余的可靠性水平。
