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High-Fidelity Model of Permanent Magnet Machine with Stator Turn Fault Suitable for Fault- Tolerant Control

The application of permanent magnet motors is growing significantly in the aerospace industry with the advent of the more electric aircraft. Aerospace applications are subject to highly demanding performance and safety requirements. As a consequence, modeling and fault-tolerant control of permanent magnet motors under faulty conditions are required. In order to develop fault tolerant control strategies, an accurate transient model of the machine under fault condition is indispensable at development stage in order to save time and resources spent on experimental testing. The aim of this task is to establish a high- fidelity and computationally efficient model of IPM machines under stator turn fault. This is achieved by extracting flux linkage maps of the machine under turn fault conditions using offline static finite element (FE) analysis and combining it with voltage equations of the machine. The method is not limited to IPM machines and the same technique can be used for modeling stator turn faults in passive rotor systems including surface PM machines, switched reluctance machines, switched flux machines and separately excited machines such as wound field synchronous machines. This approach enables the full representation of spatial harmonics and magnetic saturation under inter-turn fault and all load conditions, and therefore is the most accurate representation of the faulted motor behavior apart from a time stepping FE coupled analysis. Although the generation of flux maps from an offline static FE model is computationally expensive, once the lookup tables are established the model will have a much faster simulation speed compared to the time stepping FE coupled simulation. It also allows a speedup of simulation time compared to the FE coupled simulation in the case when the rotor is skewed since multi-slice FE simulation has to perform the simulation for all the skew slices which results in significant increase of the overall computation time.

flux-linkage-current map, permanent magnet, fault-tolerant control

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