Flywheel-type power storage device

摘要

A flywheel-type power storage device comprises a coreless synchronous and outer rotor-type motor and a flywheel. The motor comprises a stator provided with a stator winding having a cylindrical portion, and a rotor having inner and outer field members constituting therebetween a field gap in which the cylindrical portion is positioned. At least one of the inner and outer field members comprises a permanent magnet. A bearing is provided between the stator and the rotor so as to rotatably support the rotor against said stator. The stator is separated into a bearing portion constituting the bearing and a stator body provided with the stator winding. The bearing portion is supported via an elastic member by the stator body. The flywheel is fixed on the outer side of the outer field member.