Patent ID: 9325217
Filing Date: 2016-04-26
CPC Classification: F16C,F16F,H02J,H02K,Y02E

Claim Text:
1. An energy storage system comprising: a first housing having an end face; a flywheel having: a permanent magnetic bearing assembly positioned between the end face and the rotor and having a permanent magnet mounted on the first housing, and the rotor having ferromagnetic properties, to attract the rotor towards the end face; a first mechanical bearing assembly acting between the first housing and the rotor to provide radial positioning of the rotor and to limit upward axial movement of the rotor in relation to the end face, the rotor being spaced from the end face by a clearance gap; and a second mechanical bearing assembly spaced from the first mechanical bearing assembly along the drive shaft and acting between the first housing and the rotor to provide radial positioning of the rotor, the second mechanical bearing assembly permitting relative axial movement between the drive shaft and the first housing, wherein the permanent magnet is mounted on the end face, wherein the permanent magnetic bearing assembly further includes: