绝缘系统老化过程中定子-绕组等效热阻的研究

S. Williamson, R. Wróbel, J. Yon, J. Booker, P. Mellor
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引用次数: 12

摘要

高性能电机的运行受到机器中产生的损耗以及这些损耗产生的热量如何被提取的限制。对于主绕组体的导热传热,绝缘材料提供了主要的传热途径。随着机器寿命的延长,这些材料的性能也会发生变化,因此这些传热特性也会发生变化。本文描述了一组正在经历绝缘老化过程的电动机的方法和测量,以确定传热特性的变化。在测量其热性能之前,电动机要经受热、电、机械和湿度应力的综合作用。已经发现,在绝缘的标称寿命内,电动机的等效热阻增加了100%以上,而在机器的整个寿命内,机器的载流能力减少了30%以上。因此,建议在机器的初始热设计中考虑到这一点,以确保它在其整个使用寿命中仍然适合使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of equivalent stator-winding thermal resistance during insulation system ageing
High performance electrical machine operation is limited by the losses generated in the machine and how well the heat developed by these losses is extracted. For conductive heat transfer from the main winding body, the insulation materials provide the main heat transfer pathway. As a machine ages through its lifetime, these materials will change their properties, and therefore these heat transfer characteristics will also alter. This paper describes the methodology and measurements on a set of motorettes undergoing an insulation ageing process to identify the change in heat transfer characteristics. The motorettes are subjected to a combination of thermal, electrical, mechanical and humidity stresses, before their thermal performance is measured. It has been found that the equivalent thermal resistance of the motorettes over the nominal lifetime of the insulation increases by over 100%, with the current carrying capability of the machine reducing by over 30% across the machine's lifetime. It is therefore recommended that this is taken into account during the initial thermal design of the machine to ensure it remains fit for purpose during its complete life.
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