Patent US4897570A successfully refreshed from Google Patents.
US4897570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starter motor for automitove engine
Assignee: Nissan Motor Co Ltd
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Filing: 1988-02-11
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Granted: 1990-01-30
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Expires: 2008-02-11
Abstract
Abstract Elements which exhibit good thermal conductivity are disposed in contact with permanent magnets of an electric motor. These elements absorb heat from the magnets and reduce the rate at which the temperature of the magnets increases. The elements can be provided with fins and the like to increase the rate at which heat is released from the elements.
Inventors
- 👤 Yuzo Ishikawa
- 👤 Masahiko Tahara
- 👤 Yuji Hirabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:07
CPC Classifications
F; F02; F02N; F02N11/00; H; H02; H02K; H02K9/00; H02K9/22; H02K9/227; H02K9/223
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
An electric motor comprising: a plurality of stationary permanent magnets, said permanent magnets forming part of said motor; an arrangement for selectively connecting said motor with a rotatable element of said device; and thermal transfer means associated with said permanent magnets for absorbing heat from said magnets; wherein said thermal transfer means comprises a stationary arrangement for dispersing the heat absorbed therein into the environment surrounding the same; said thermal transfer means comprises a member having good heat conductivity and said heat dispersing arrangement takes the form of a stationary fin formed on said member; said plurality of stationary permanent magnets are disposed within a stationary housing of said electric motor, said permanent magnets are aligned with one another and said member comprises an annular member which is disposed in contact with the ends of the aligned magnets; and said annular member has crenulations formed thereon, said crenulations projecting between adjacent magnets in such a manner as to increase the ease with which heat is transferred from the magnets to said annular member.
Claim 2
Dependent Claim
173 words
An electric motor comprising: a plurality of stationary permanent magnets, said permanent magnets forming part of said motor; an arrangement for selectively connecting said motor with a rotatable element of said device; and thermal transfer means associated with said permanent magnets for absorbing heat from said magnets; wherein said thermal transfer means comprises a stationary arrangement for dispersing the heat absorbed therein into the environment surrounding the same; said thermal transfer means comprises a member having good heat conductivity and said heat dispersing arrangement takes the form of a stationary fin formed on said member; said plurality of stationary permanent magnets are disposed within a stationary housing of said electric motor, said permanent magnets are aligned with one another and said member comprises an annular member which is disposed in contact with the ends of the aligned magnets; and said annular member has crenulations formed thereon, said crenulations projecting between adjacent magnets in such a manner as to increase the ease with which heat is transferred from the magnets to said annular member.
Claim 3
Dependent Claim
127 words
A starter motor for an automotive vehicle comprising: an essentially stationary cylindrical housing; a plurality of stationary, elongate permanent magnets disposed about the inner periphery of said stationary housing in such a manner that said magnets extend essentially parallel to the axis of said housing, said magnets having first and second ends; a first annular, nonmagnetic, heat-absorbing member disposed within said housing and in contact with the first ends of said magnets; a second annular, nonmagnetic, heat-absorbing member disposed within said housing and in contact with the second ends of said magnets, said second member being discrete from said first member; and stationary fin means for increasing the amount of heat exchange with the ambient atmosphere, said fin means being formed on said first and second members.
Claim 4
Dependent Claim
127 words
A starter motor for an automotive vehicle comprising: an essentially stationary cylindrical housing; a plurality of stationary, elongate permanent magnets disposed about the inner periphery of said stationary housing in such a manner that said magnets extend essentially parallel to the axis of said housing, said magnets having first and second ends; a first annular, nonmagnetic, heat-absorbing member disposed within said housing and in contact with the first ends of said magnets; a second annular, nonmagnetic, heat-absorbing member disposed within said housing and in contact with the second ends of said magnets, said second member being discrete from said first member; and stationary fin means for increasing the amount of heat exchange with the ambient atmosphere, said fin means being formed on said first and second members.
References Cited (Backward Citations)
US3426224A
Cited
US4237393A
Cited
US4338533A
Cited
US4451749A
Cited
US4549341A
Cited
US4671125A
Cited
US4678954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |