Electromagnetic-thermal coupled simulation under various fault conditions of a triple redundant 9-phase PMASynRM

This paper performs electromagnetic (EM) and thermal coupled simulation based on 2D transient electromagnetic and 3D thermal model of a triple redundant 9-phase permanent magnet-assisted synchronous reluctance motor (PMASynRM) under various fault conditions at different speeds. The coupled simulation process is controlled by a scripting file. The resultant temperatures under EM-thermal coupled simulation will be comprehensively compared with those under thermal-only simulation. The predicted current waveforms under fault conditions by the 2D EM model and predicted temperatures by the 3D thermal model will be compared with the test results for validation. The outcomes of the study not only gives a better understanding of the thermal behavior, but also provides a guidance to the necessity of the EM-thermal coupled simulation under different fault conditions as well as to determination of the maximum permissible fault detection time before permanent damage due to the fault may occur.