Patent ID: 6727616
Filing Date: 2004-04-27
Classification: F16C,F16F,H02K,Y02E

Abstract:
A flywheel energy storage system, comprising:an energy storage flywheel supported for rotation about a substantially vertical axis on a combination bearing system using a mechanical rolling element and a first magnetic bearing; a motor and generator for accelerating and decelerating said flywheel for storing and retrieving energy; said mechanical rolling element bearing is located at only one axial end of said flywheel and provides axial and radial support for said flywheel; said magnetic bearing is located at an axial end of said flywheel opposite said one end thereof, and provides axial magnetic force and passive magnetic radial centering force to support said flywheel; said flywheel is connected to said mechanical rolling element bearing using a connecting element that imparts low radial stiffness.