Investigation of a High Speed Permanent Magnet Synchronous Machine for Magnetic Suspended Flywheel Energy Storage System

Le résumé fourni par la source

Energy storage technology is one of the key technologies of Energy Internet. Benefiting from the advantages such as high power density and long life, flywheel energy storage system (FESS) is currently one of the most popular energy storage technologies. In flywheel energy storage systems, the high speed electrical machine is the center of energy conversion, which directly affects the charging and discharging power, as well as the amount of stored energy. In this paper, a high speed permanent magnet synchronous machine (HS-PMSM) for magnetic suspended flywheel energy storage system is investigated. With a three-stage-rotor structure, the proposed machine retains the characteristics of common PMSMs, and has the advantages of easy manufacturing and assembling. First of all, the fundamental structure and working principle of the proposed HS-PMSM are discussed. Then, the basic characteristics of HSPMSM such as permanent magnet flux linkage, no-load back electromotive force, cogging torque and electromagnetic torque are analyzed by finite element method. The result shows that the proposed machine in this paper can provide considerable performance with a simple and solid structure, which is conducive to the increase of machine speed, as well as the increase of system power and stored energy, under the premise of easy manufacturing and assembling.

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