Flywheel based energy storage system

Electrical generator or motor structure – Dynamoelectric – Rotary

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310191, 310254, H02K 702, H02K 112

Patent

active

056147775

ABSTRACT:
A compact energy storage system includes a high speed rotating flywheel and an integral motor/generator unit. The rotating components are contained within a vacuum enclosure to minimize windage losses. The flywheel rotor has a unique axial profile to both maximize the energy density of the flywheel and to maximize the volumetric efficiency of the entire system. The rotor is configured with hollowed-out regions at each axial end to accommodate magnetic bearing assemblies. The integral motor/generator is disposed on a tail shaft of the flywheel rotor, outboard of the magnetic bearing assembly. The motor/generator stator is mounted on a translation carriage for axial movement. During normal operation, the stator is in operative alignment with a rotor on the flywheel shaft. However, when neither motor nor generator operation is required, the stator is extended to an axial position where it is effectively decoupled from the rotor. A magnetic shield surrounding the rotor confines the lines of magnetic flux to minimize eddy currents, and thereby minimize parasitic energy losses that would otherwise slow the flywheel during idle periods.

REFERENCES:
patent: 4660435 (1987-04-01), Davis et al.
patent: 4821599 (1989-04-01), Medlicott
patent: 4996016 (1991-02-01), Walls et al.
patent: 5124605 (1992-06-01), Bitterly et al.
patent: 5462402 (1995-10-01), Bakholdin et al.

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