Abstract

Increasing environmental awareness is pushing the design of electic motors to favor none rare-earth solutions (i.e., without permanent magnets), and one such example is the SyncRM 2 (or concentrated-coiled SRM2) being proposed for the electric hybrid automobile Toyota Yaris. Following on an already established line of research on this topic, this article proposes a new design that re-assigns most of the magnetic material in the stator to the rotor—resulting in the Dual-sided SyncRM (a variant of the SRM2). The detrimental effect (caused by the extra gap) of slightly reducing the aligned inductance is overwhelmingly outweighed by the beneficial effect of drastically reducing the unaligned inductance. Extensive back-to-back FEMM analysis was conducted, where the recomputed SRM2 matches previous research, providing confidence to the favorable predictions of the Dual-sided SyncRM. Both performances are compared, with the venue being available for download on an open-source database. A realistic photo-rendered three-dimensional model is displayed and also available. An important outcome is the Dual-sided SyncRM torque (and power) increased by 29% (with respect to the SRM2), achieving a saliency ratio of 10 and an efficiency boost to 91% (at the rated operational speed of 1200rpm).

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