US5032749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor
Assignee: AO Smith Corp
•
Filing: 1990-01-26
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Granted: 1991-07-16
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Expires: 2010-01-26
Abstract
Abstract An electric motor comprising a stator having a plurality of radially inwardly extending circumferentially spaced polar segments. A coil is wound around each stator segment. A unitary motor overload assembly is provided and connected by a standard lead from one of the coils and by a solid uninsulated conductor lead to the other of the coils. The cross-section of the solid conductor is such that the motor will operate satisfactorily during normal running or locked rotor condition but would open by melting in the event of a winding failure of the coils which would normally result in higher than normal operating currents in the winding.
Inventors
- 👤 Thomas W. Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:04
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/20; H02K11/25
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
An electric motor comprising a stator having a plurality of radially inwardly extending circumferentially spaced polar segments, a coil wound around each stator segment, and a unitary motor overload asembly of a resettable type, a first standard lead extending from one of the coils to said overload assembly, a second conductor lead extending from another of the coils to said overload assembly, said second conductor lead having a melting point such that when the motor operates satisfactorily during normal running and locked rotor condition, but when the overload assembly fails in a closed condition, said second conductor lead will open by melting preventing the motor from heating excessively.
Claim 2
Dependent Claim
108 words
An electric motor comprising a stator having a plurality of radially inwardly extending circumferentially spaced polar segments, a coil wound around each stator segment, and a unitary motor overload asembly of a resettable type, a first standard lead extending from one of the coils to said overload assembly, a second conductor lead extending from another of the coils to said overload assembly, said second conductor lead having a melting point such that when the motor operates satisfactorily during normal running and locked rotor condition, but when the overload assembly fails in a closed condition, said second conductor lead will open by melting preventing the motor from heating excessively.
Claim 3
Dependent Claim
26 words
The electric motor set forth in claim 1 wherein said second conductor lead comprises a wire of smaller diameter than the wire of said standard lead.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |