Electromagnetic-Thermal Coupled Simulation Under Various Fault Conditions of a Triple Redundant 9-phase PMASynRM

This article performs electromagnetic (EM) and thermal coupled simulation based on two-dimensional (2-D) transient electromagnetic and 3-D thermal model of a triple redundant nine-phase permanent magnet-assisted synchronous reluctance motor 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 2-D EM model and predicted temperatures by the 3-D 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.