J.-P. Lee, T.-H. Sung, S.-Y. Jung, Y.-H. Han, D.-J. You, and S.-M. Jang (Korea)
Superconductor Flywheel Energy Storage System (SFES), Rotational loss, Superconductor bearing, Motor/generator, idling loss, permanent magnet synchronous motor (PMSM)
The rotational loss is one of the most important problems for the practical use of superconductor flywheel energy storage system. The rotational loss of the SFES is mainly generated in the part of magnetic field such as superconductor bearing and motor/generator. The rotational loss of PM type motor/generator is much larger than that of superconductor bearing. So the motor must be designed in accordance with application object of flywheel energy storage system as well as the required power. In this paper, permanent magnet synchronous motor (PMSM) for superconductor flywheel energy storage systems is designed by analytical method of magnetic field and dynamic modeling. This design model consists of the surface-mounted PM rotor with diametrical magnetization and slotless iron-cored stator. And, its performance is evaluated in motoring and idling mode considering the required power and core loss. The results show that the design of PMSM to satisfy the required power and the calculation of core loss can be accomplished by the analytical solution through magnetic field analysis.
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