
Memory motors [1] [2] equipped with either single low-coercive force (LCF) or hybrid magnets have been extensively investigated due to the elimination of the associated excitation loss during the flux adjustment. Thus, they enable high efficiency operation within a wide range of speeds and loads. Very recently, switched-flux topologies that feature high torque density, simple rotor, and expedient heat dissipation, as well as good armature reaction with standability, have been extended to memory machines [3] [4], viz. switched-flux memory machine (SFMM). Nevertheless, the previously reported structures generally suffer from the significant geometric conflicts between LCF magnet and windings within the stator. Thus, the peripheral dimensions of the previously researched SFMMs are enlarged, which inevitably results in the compromise of the torque density. Correspondingly, a consequent magnet pole SFMM (CMP-SFMM) was proposed so as to simplify the mechanical manufacturing and improve the torque density at the expense of less magnet usage compared to its hybrid magnet counterparts. Nevertheless, owing to the significant magnetic saturation, the flux adjustable range appears to be relatively limited, which will deteriorate the flux weakening performance.
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