Research Overview on Field Modulated Magnetic Gear
Transcending the topology of the traditional magnetic gears,the field modulated magnetic gears(FMMGs)adopts the coaxial topology and have a high utilization of permanent magnets.FMMGs have the advantages of no contact,no wear,no lubrication,low noises and overload protection,and can provide a larger torque and a higher torque density.So,FMMGs can be widely used in the navigation,wind turbine systems,petrochemical engineering and other fields.Based on a brief history review of the traditional magnetic gear and outline of the working principle of FMMGs,kinds of radial,axial and intersecting axes FMMGs are introduced,and the torque characteristics of them are compared.The calculation methods and optimization methods of related researches about FMMGs are summarized.The performance indexes of different types of FMMGs such as torque density,cogging torques,losses and temperature rises are compared and analyzed.Finally,the applications and prospects of FMMGs in magnetic geared machines,polar and other environments are summarized.The future research areas of FMMGs are predicted.
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