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US4612494A
Expired / Lapsed
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Flywheel energy storage system
Assignee: Mitsubishi Electric Corp
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Filing: 1985-01-16
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Granted: 1986-09-16
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Expires: 2005-01-16
Abstract
Abstract A flywheel energy storage system comprises a dynamoelectric machine, a flywheel connected to the dynamoelectric machine for rotation therewith, an auxiliary machine for performing operational tasks associated with the operation of the dynamoelectric machine and the flywheel, a low voltage power source for operating the auxiliary machine, a permanent magnet generator connected to be operated by energy stored in the flywheel for generating electric power which is supplied to the auxiliary machine when the low-voltage power source is not available, and a converter means connected between the permanent magnet generator and the auxiliary machine for converting a varying voltage from the permanent magnet generator into a stable voltage which can be supplied to the auxiliary machine.
Inventors
- 👤 Toshimi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:47
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/02; H02K7/025; H02J; H02J15/00; H02J15/30; F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0442; Y; Y02; Y02E; Y02E60/00; Y02E60/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A flywheel energy storage system comprising: a dynamoelectric machine; a flywheel connected to said dynamoelectric machine for rotation therewith an auxiliary machine for performing operational tasks associated with the operation of said dynamoelectric machine and said flywheel; a low voltage power source for operating said auxiliary machine; a permanent magnet generator connected to be operated by energy stored in said flywheel for generating electric power of a varying voltage when said low-voltage power source is not available; and converter means connected between said permanent magnet generator and said auxiliary machine for converting said varying voltage from said permanent magnet generator into a stable voltage to provide a power supply for said auxiliary machine.
Claim 2
Dependent Claim
113 words
A flywheel energy storage system comprising: a dynamoelectric machine; a flywheel connected to said dynamoelectric machine for rotation therewith an auxiliary machine for performing operational tasks associated with the operation of said dynamoelectric machine and said flywheel; a low voltage power source for operating said auxiliary machine; a permanent magnet generator connected to be operated by energy stored in said flywheel for generating electric power of a varying voltage when said low-voltage power source is not available; and converter means connected between said permanent magnet generator and said auxiliary machine for converting said varying voltage from said permanent magnet generator into a stable voltage to provide a power supply for said auxiliary machine.
Claim 3
Dependent Claim
25 words
A flywheel energy storage system as claimed in claim 1 wherein a speed changing transmission mechanism is connected between said flywheel and said dynamoelectric machine.
Claim 4
Dependent Claim
25 words
A flywheel energy storage system as claimed in claim 1 wherein a disconnectable coupling is connected between said permanent magnet generator and said dynamoelectric machine.
Claim 5
Dependent Claim
22 words
A flywheel energy storage system as claimed in claim 1 wherein said converter means includes two converters connected in parallel for redundancy.
Claim 6
Dependent Claim
22 words
A flywheel energy storage system as claimed in claim 1 wherein a braking resistor is connected in parallel to said converter means.
References Cited (Backward Citations)
US4278928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |