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Fault-Tolerant Performance of a Novel Flux-Switching Permanent Magnet Linear Machine Based on Harmonic Current Injection

A novel flux-switching permanent magnet linear machine (FSPMLM) with fault-tolerant capability is proposed. First, the structure and operation principle of the proposed FSPMLM are elaborated by comparing them to the existing FSPMLM. Second, considering the contribution of the reluctance thrust component, the thrust performance of the FSPMLM based on the static characteristics is analyzed under normal and fault conditions. The cause of thrust ripple of the proposed FSPMLM is also identified, and a fault-tolerant current control strategy based on the current harmonic injection method is implemented to compensate for the thrust ripple. Two-dimensional transient finite element method is used to investigate the thrust performance under normal and fault conditions. Finally, the results of finite element analysis are validated by the results obtained in the experiment.