Inertial energy storage device and method of assembling same

摘要

An inertial energy storage device (100) includes a plurality of stationary electrical windings (118), a rotatable shaft (112), and a plurality of rotatable magnets (116) coupled to the rotatable shaft. The plurality of stationary electrical windings extend about at least a portion of the plurality of rotatable magnets. The inertial energy storage device also includes a flywheel device (108) that includes a substantially cylindrical hub (602) rotatably coupled to the rotatable shaft. The flywheel device also includes a radially inner ring (608/614) that includes a first material having a first density. The flywheel device further includes a radially outer ring (612/614) that includes a second material having a second density. The first density is greater than the second density.