US4446391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating electric machinery
Assignee: Mitsubishi Electric Corp
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Filing: 1981-10-22
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Granted: 1984-05-01
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Expires: 2001-10-22
Abstract
Abstract A rotating electric machinery comprises a stator; a rotor which is fixed to a rotor shaft and is driven by said motor; a fan which is rotatably connected through a bearing to said rotor to feed air in a predetermined direction; and at least one pair of magnets having a predetermined magnetic force which are fixed on either said rotor or said fan and a magnetic substance having a predetermined coercive force which is fixed on said fan or on said rotor to face said magnet with a desired gap.
Inventors
- 👤 Yasuhiro Sekine
- 👤 Masayuki Kuwayama
- 👤 Hiroshi Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/02; H02K9/04; H02K9/06; F; F04; F04D; F04D25/00; F04D25/02; F04D25/026; H02K7/00; H02K7/10; H02K7/11; H02K2213/00; H02K2213/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A rotating electric machine, comprising: an armature rotor fixed to a rotatable rotor shaft; a stationary stator fixed adjacent said rotor; fan means rotatably mounted via bearing means on said rotor shaft, said fan means including a first surface; a rotor spider of said rotor spider having a second surface facing said first surface on an axis substantially perpendicular to said rotor shaft and separated therefrom by a predetermined gap; magnet means having at least two poles and fixed to one of said first and second surfaces; and a magnetic material fixed to the other of said first and second surfaces, whereby said magnet means and said magnetic material face one another axially and are separated by said predetermined gap.
Claim 2
Dependent Claim
120 words
A rotating electric machine, comprising: an armature rotor fixed to a rotatable rotor shaft; a stationary stator fixed adjacent said rotor; fan means rotatably mounted via bearing means on said rotor shaft, said fan means including a first surface; a rotor spider of said rotor spider having a second surface facing said first surface on an axis substantially perpendicular to said rotor shaft and separated therefrom by a predetermined gap; magnet means having at least two poles and fixed to one of said first and second surfaces; and a magnetic material fixed to the other of said first and second surfaces, whereby said magnet means and said magnetic material face one another axially and are separated by said predetermined gap.
Claim 3
Dependent Claim
22 words
The rotating electric machine according to claim 1 wherein said first and second surfaces comprise circumferential surfaces extending in the radial direction.
Claim 4
Dependent Claim
15 words
The rotating electric machine according to claim 1 wherein said machine comprises a traction motor.
References Cited (Backward Citations)
DE671285C
Cited
US2937803A
Cited
CH390375A
Cited
US3229132A
Cited
US3209184A
Cited
DE1188191B
Cited
DE1563049A1
Cited
DE1613060A1
Cited
US3456141A
Cited
GB1268444A
Cited
US3566168A
Cited
FR2355205A1
Cited
DE2653459A1
Cited
DE2821973A1
Cited
SU680113A1
Cited
GB2054279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |