Title:
TUBULAR FLYWHEEL ENERGY STORAGE SYSTEM
Document Type and Number:
WIPO Patent Application WO2003021738
Kind Code:
A3
Abstract:
A flywheel energy storage system has a tubular cylindrical steel flywheel rim (71) that spins, with a peripheral speed greater than 200 meters per second in normal, fully charged operation, about a vertical axis inside an evacuated chamber for energy storage and retrieval. The steel rim is heat treated to a tensile yield strength greater than 100 ksi and plane strain fracture toughness in the hoop direction greater than 70 ksi(in) 1/2 A motor generator (70) is coupled to the flywheel for accelerating the angular velocity of the flywheel for storage of energy, and for converting angular inertial of the flywheel back into electrical energy. The motor/generator (70) may include permanent magnet pieces (72, 75) filling the circumference of the inner diameter of the flywheel rim. The magnet pieces are radially magnetized and forms a dipole field.The stator (125) is fixed in the bore of the flywheel rim and intercepts the dipole field.
Inventors:
GABRYS CHRISTOPHER W (US)
CAMPBELL DAVID R (US)
CAMPBELL DAVID R (US)
Application Number:
PCT/US2002/027781
Publication Date:
November 27, 2003
Filing Date:
August 30, 2002
Export Citation:
Assignee:
INDIGO ENERGY INC (US)
GABRYS CHRISTOPHER W (US)
CAMPBELL DAVID R (US)
GABRYS CHRISTOPHER W (US)
CAMPBELL DAVID R (US)
International Classes:
F16F15/18; F16F15/30; H02K7/02; (IPC1-7): H02K7/02
Foreign References:
| US4406950A | 1983-09-27 | |||
| US4412170A | 1983-10-25 | |||
| US6150742A | 2000-11-21 | |||
| US4589707A | 1986-05-20 | |||
| US6111332A | 2000-08-29 | |||
| US4182967A | 1980-01-08 |
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