In this paper, the transient thermal response of a conventional double-layer switched-flux permanent-magnet machine is studied for both healthy and fault conditions such as inter-turn short-circuit. A highly optimized and accurate cosimulation model for different operating conditions is developed requiring low computation and time resources. The electromechanical models for both healthy and faulty operation are implemented in MATLAB/Simulink while the thermal model is implemented using three-dimensional (3-D) finite-element model (FEM) software. Both models are dynamically coupled to enable the influence of temperature rise on the electromagnetic performance and vice versa to be predicted. Operation under various conditions are investigated, and it is found that the temperature rise under fault conditions and high speed can lead to irreversible demagnetization of the permanent magnets. The superposition principle is used to accurately estimate the impact of short-circuit currents on the temperature rise. A series of dynamic tests are carried out to validate the transient thermal response prediction when operating during both the healthy and fault conditions.

中文翻译：

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故障运行下开关磁通永磁电机的多物理场组合模型

在本文中，研究了传统双层开关磁通永磁电机在健康和故障条件（例如匝间短路）下的瞬态热响应。为不同的操作条件开发了高度优化和准确的协同仿真模型，需要低计算和时间资源。健康和故障运行的机电模型在 MATLAB/Simulink 中实现，而热模型使用三维 (3-D) 有限元模型 (FEM) 软件实现。两种模型都是动态耦合的，可以预测温升对电磁性能的影响，反之亦然。研究了各种条件下的操作，并发现故障条件和高速下的温升会导致永磁体不可逆退磁。利用叠加原理准确估计短路电流对温升的影响。进行了一系列动态测试，以验证在健康和故障条件下运行时的瞬态热响应预测。