This article provides a comprehensive analysis of the thermal characteristics of a 4-phase 8/6 switching reluctance motor (SRM) designed for use in an e-rickshaw (3-wheeler) application. The determination of core and copper losses is achieved through electromagnetic analysis using Finite Element Analysis (FEA). The analysis is conducted via MOTORCAD, a multiphysics design software. This work includes the examination of both static and transient temperature conditions. Static analysis entails the estimation of losses by taking into account the motor's maximum current and operating the motor under steady-state conditions. Transient analysis involves the examination of two separate scenarios. One possesses a simple transient characteristic, while the other possesses a distinct duty cycle. The losses obtained from the electromagnetic analysis are used as the input for the simple transient thermal analysis. During transient analysis involving the duty cycle, losses are assigned to certain operating conditions, such as changes in the operating speed of the motor. This study employs the Lumped Parameter Thermal Network (LPTN), as well as 3D and 2D FEA techniques to conduct thermal analysis. The findings were compared and subsequently given in the article. The findings produced from the LPTN and 3D FEA approaches demonstrate a strong correlation. The motor's maximum temperature is limited to 180 °C. The findings indicate that the highest temperature, both under static and transient conditions, is below the maximum attainable value.

中文翻译：

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用于电动汽车应用的 4 相 8/6 SRM 的热分析

本文对设计用于电动人力车（三轮车）应用的 4 相 8/6 开关磁阻电机 (SRM) 的热特性进行了全面分析。磁芯和铜损的确定是通过使用有限元分析 (FEA) 进行电磁分析来实现的。该分析是通过多物理场设计软件 MOTORCAD 进行的。这项工作包括静态和瞬态温度条件的检查。静态分析需要通过考虑电机的最大电流并在稳态条件下运行电机来估计损耗。瞬态分析涉及对两个独立场景的检查。一种具有简单的瞬态特性，而另一种则具有独特的占空比。从电磁分析中获得的损耗用作简单瞬态热分析的输入。在涉及占空比的瞬态分析期间，损耗被分配给某些运行条件，例如电机运行速度的变化。本研究采用集总参数热网络 (LPTN) 以及 3D 和 2D FEA 技术来进行热分析。对研究结果进行了比较并随后在文章中给出。 LPTN 和 3D FEA 方法得出的结果显示出很强的相关性。电机的最高温度限制为 180 °C。研究结果表明，静态和瞬态条件下的最高温度均低于可达到的最大温度。