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A flywheel system for storing and delivering on demand electrical energy includes a flywheel supported for high speed rotation on bearings in a vacuum enclosure, and a motor-generator for spinning the flywheel up to speed and then for converting the rotational inertia in the flywheel back to electri

A flywheel system for storing and delivering on demand electrical energy includes a flywheel supported for high speed rotation on bearings in a vacuum enclosure, and a motor-generator for spinning the flywheel up to speed and then for converting the rotational inertia in the flywheel back to electrical power. The flywheel includes a solid steel hub and a rim having only two rings press-fit on the hub with an interference fit. The rings are filament wound construction made primarily from standard modulus carbon fiber/epoxy. The steel hub stores between 40% and 60% of the energy in the flywheel. The press-fitting of the rings on the hub creates radial interference pressure between the hub and each of the composite rings that is greater than 5 ksi when at rest. The outer carbon fiber/epoxy ring is radially thinner than the inner ring, and both the hub outer diameter and the inner diameter of the assembled composite rim are tapered with the same angle. The inner composite ring and the inner diameter of the outer ring are also tapered with a matching taper. The ratio of steel hub mean diameter to flywheel outer diameter is between 0.50 and 0.70, and the ratio of inner carbon fiber/epoxy ring mean outer diameter to flywheel outer diameter is between 0.80 and 0.90. An epoxy resin is used for the manufacture of composite flywheels that is comprised primarily of Bisphenol A epoxy and a mixture of curing agents comprised between 20 and 70% of cycloaliphatic amine by weight. The remainder of the curing agent mixture is comprised primarily of an aliphatic amine or ether amine.

대표청구항 ▼

A flywheel system for storing and delivering on demand electrical energy includes a flywheel supported for high speed rotation on bearings in a vacuum enclosure, and a motor-generator for spinning the flywheel up to speed and then for converting the rotational inertia in the flywheel back to electri

A flywheel system for storing and delivering on demand electrical energy includes a flywheel supported for high speed rotation on bearings in a vacuum enclosure, and a motor-generator for spinning the flywheel up to speed and then for converting the rotational inertia in the flywheel back to electrical power. The flywheel includes a solid steel hub and a rim having only two rings press-fit on the hub with an interference fit. The rings are filament wound construction made primarily from standard modulus carbon fiber/epoxy. The steel hub stores between 40% and 60% of the energy in the flywheel. The press-fitting of the rings on the hub creates radial interference pressure between the hub and each of the composite rings that is greater than 5 ksi when at rest. The outer carbon fiber/epoxy ring is radially thinner than the inner ring, and both the hub outer diameter and the inner diameter of the assembled composite rim are tapered with the same angle. The inner composite ring and the inner diameter of the outer ring are also tapered with a matching taper. The ratio of steel hub mean diameter to flywheel outer diameter is between 0.50 and 0.70, and the ratio of inner carbon fiber/epoxy ring mean outer diameter to flywheel outer diameter is between 0.80 and 0.90. An epoxy resin is used for the manufacture of composite flywheels that is comprised primarily of Bisphenol A epoxy and a mixture of curing agents comprised between 20 and 70% of cycloaliphatic amine by weight. The remainder of the curing agent mixture is comprised primarily of an aliphatic amine or ether amine. ssure of 10 atm and at a temperature of 120° C. 9. A process as claimed in claim 1, where said alcoholic or halogenated solvent used in step (a) is selected from dichloromethane, n-propanol, isopropanol, isobutanol, cyclohexanol, and their mixtures, and said complex of a transition metal with chiral diphosphinic ligands is a ruthenium complex selected from {RuCl(p-cymene)[(S)-BINAP]}-Cl, Ru HCl[(S)-BINAP]2,Ru2Cl4[(S)-BINAP]2(NEt3). 10. A process as claimed in claim 1, wherein said reagent used in step (b), capable of transforming the --OH group into a leaving group, is added to compound (III) at a temperature comprised between -20° C. and +25° C. in the presence of an inert solvent and of a basic compound. 11. A process as claimed in claim 10, wherein said inert solvent is toluene and said basic compound is triethylamine. 12. A process as claimed in claim 1, wherein said reagent used in step (b), capable of transforming the --OH group into a leaving group, is selected from tosyl chloride, benzenesulphonyl chloride, methanesulphonyl chloride. 13. A process as claimed in claim 1, wherein said sesamol (3,4-methylenedioxyphenol) is added as a mixture with an alcoholic solvent in the presence of a base and the resulting mixture is heated for 2 to 4 hrs. 14. A process as claimed in claim 1, wherein said N-dealkylation in step (c) is effected by reacting the product (IV) with phenylchloroformiate, and treating the resulting product with a base.