Hybrid bearing systems are most likely to see use first. However, high-temperature superconductor (HTSC) bearings may be economical and could possibly extend the time energy could be stored economically. The expense of refrigeration led to the early dismissal of low-temperature superconductors for use in magnetic bearings. Possible future use of superconducting bearings To reduce friction, magnetic bearings are sometimes used instead of mechanical bearings. Newer systems use carbon-fiber composite rotors that have a higher tensile strength than steel and can store much more energy for the same mass. The flywheel and sometimes motor–generator may be enclosed in a vacuum chamber to reduce friction and energy loss.įirst-generation flywheel energy-storage systems use a large steel flywheel rotating on mechanical bearings. Main components The main components of a typical flywheelĪ typical system consists of a flywheel supported by rolling-element bearing connected to a motor–generator.
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