| 摘要 |
<p>A stiff, metallic hub (40) for an energy storage device is disclosed. The hub (40) produces a critical velocity that is significantly greater than the design operating speed of a flywheel assembly (10) so that resonant frequency is never reached during normal operation of the flywheel assembly (10). The hub (40) comprises a central core section (70) that maintains a tight interference fit with the rotating shaft (25); an outer rim section (90) that maintains a tight interference fit with the high-strength, low-density composite fiber rim (20), in which energy primarily is stored; and a web section (80) situated therebetween and extending radially from the shaft (25). At high operating speeds, the outer rim (90) expands radially commensurate with the composite rim (20) so that enough of the outer rim (90) remains in tight interference fit with the composite rim (20) to substantially minimise vibrations.</p> |
