Research progress on permanent magnet machines for flywheel energy storage
High speed permanent magnet machines can fulfill the requirements of flywheel energy storage systems by providing high efficiency and high power density.Currently,there are two main challenges:rotor strength and heat dissipation.The rotor structure must endure the centrifugal forces generated by high-speed rotation,while the vacuum environment exacerbates the issue by increasing thermal resistance and complicating heat dissipation This article analyzes the classification and structural characteristics of permanent magnet machines used in flywheel energy storage systems.It compares key parameters across various examples of these machines,examines methods for calculating and reducing electromagnetic losses,and summarizes the loss ratios for different flywheel permanent magnet motors.The ratio of electromagnetic losses to the rated power of permanent magnet motors is typically below 5%,with rotor losses in high-power permanent magnet motors often less than 0.4% of the rated power.The article provides a brief review of the current research on thermal management for permanent magnet machines.Key areas for future development in flywheel energy storage permanent magnet machines include the exploration of new permanent magnet materials,rotor direct cooling methods,and integrated rotor structures.
flywheel energy storagepermanent magnet machinelossescooling measures
国家科技期刊平台
NSTL
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