Abstract
A large capacity and high power energy storage flywheel system(FESS) is developed and applied to wind farms in this paper, focusing on the high efficiency design of the key electromagnetic components of the FESS, i.e motor/generator, radial magnetic bearing(RMB) and axial magnetic bearing (AMB). Firstly, a axial-flux permanent magnet synchronous motor (AFPMSM) based on soft magnetic composite material (SMC) is designed and its electromagnetic field is analyzed by FEM. Then, considering the structure of FESS and motor, a permanent magnet biased radial magnetic bearing (PMRMB) and a HALBACH axial permanent magnetic bearing(PMAMB) is proposed. They have the advantages of low power consumption and large bearing capacity. Finally, the flywheel was made and its performance was tested.
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