A review on the field-modulated magnetic gears: Development status, potential applications, and existent challenges

As a type of magnetic device being able to realize contact-free power transmission together with sufficient volumetric torque density, the field-modulated magnetic gear (FMMG) has become a promising alternative to the mechanical gear having rigid construction yet suffering lots of issues generated by the continuous teeth friction. The conventional magnetic gears (MGs) that behave as simple copies of their mechanical counterparts and can be roughly defined as origination of the FMMG are briefly introduced at first. Subsequently, the topology and material advancements proposed to improve operational performance of the FMMG are comprehensively summarised so as to clarify its current development status. Finally, potential applications of the FMMG due to its inherent advantages are compared against the existent challenges. The review aims to provide referable guidelines for researchers working at the field of high-performance MGs. The development status of the FMMG performing as a type of contact-free power-transmission device with sufficient volumetric torque density is summarised. Then, the opportunities of the FMMG due to its inherent advantages are compared against the existent issues preventing the FMMG from further application. A novel FMMG being able to address or alleviate these issues is proposed. The review is devoted to guidelines for researchers working at the high-performance FMMGs.image

Automated summary

As a magnetic device capable of contact-free power transmission and sufficient volumetric torque density, field-modulated magnetic gear (FMMG) has become a promising alternative to mechanical gear due to its distinct advantages. In this review, the conventional magnetic gears (MGs) and their connection with FMMG are briefly introduced, followed by a comprehensive summary of the FMMG's topology and material advancements. Furthermore, potential applications and challenges of FMMG are compared to provide guidelines for researchers working on high-performance magnetic gears.