Self-adjusting airgap motor/generator for flywheel system

Details Self-adjusting airgap motor/generator for flywheel system Self-adjusting airgap motor/generator for flywheel system

1994-03-31

1997-05-06

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310153, 310191, 310209, 290 38A, H02K 702

Patent

active

056274190

ABSTRACT:
A flywheel system having permanent magnets 20 disposed on a flywheel 10 rotating about a shaft 12 is provided with a stator 28 having an outer diameter which is oriented concentrically and shaped conically within a similarly shaped inner diameter of the flywheel 10 (and the magnets 20) and the stator 28 is slidably and rotatably mounted to a shaft 30 thereby allowing a gap g.sub.1 between the stator 28 and the rotor/flywheel 10 to be adjustable. When energy is being provided to (spin-up) or extracted from (spin-down) the flywheel 10, the stator is automatically forced to the left (FIG. 1) due to torque on the stator 28, thereby causing the gap g.sub.1 to be small to provide strong electromagnetic interaction between the stator 28 and the flywheel 10. Conversely, when the flywheel 10 is freewheeling, the stator 28 is forced to the right by a spring 40 causing the gap g.sub.1 to increase to a distance large enough to minimize electro-magnetic drag on the flywheel 10.

REFERENCES:
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patent: 2677256 (1954-05-01), Donandt
patent: 3361947 (1968-01-01), Schlebusch
patent: 3589485 (1971-06-01), Kajitani et al.
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patent: 4233521 (1980-11-01), Pouget
patent: 4306167 (1981-12-01), Tomite et al.
patent: 4920295 (1990-04-01), Holden et al.
Campbell P., "Performance Calculation of a Permanent-Magnet Axial Field DC Machine Electric Power Application," vol. 2, No. 4, pp. 139-144 (1979) Figs. 2.14-2.24.

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