US3886362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for thermal examination of the interior surface of annular stator packs for electrical machines
Assignee: Individual
•
Filing: 1973-04-09
•
Granted: 1975-05-27
•
Expires: 1993-04-09
Abstract
Abstract A method for investigating the quality of active-steel stator packs for an electric machine in which an infrared heat sensor is introduced into the bore of a stator to carry out continuous measurement of the entire inner surface of the stator, the result being obtained in the form of an infrared chart made to scale, the contrast areas of the chart serving to determine the coordinates and shape of the excess-heating zones in the active steel of the stator.
Inventors
- 👤 Mikhail Mikhailovi Miroshnikov
- 👤 Evgeny Nikolaevich Mineev
- 👤 Konrad Saakovich Karapetian
- 👤 Roza Nikolaevna Ivanova
- 👤 Vasily Vasilievich Romanov
- 👤 Sergei Nikolaevich Kurnakov
- 👤 Garri Mikhailovich Khutoretsky
- 👤 Ivan Ivanovich Elin
- 👤 Valentin Mikhailovich Bykov
- 👤 Dmitry Dmitrievich Valchikhin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/72
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A method for examining annular active-steel stator packs for an electric machine comprising heating the active steel of a stator pack, introducing an infrared heat sensor and optical receiver into the bore of the stator pack, uniformly moving said infrared heat sensor and optical receiver along the axis of the stator pack while rotating the optical receiver within the stator pack so that heat radiation is received by the sensor from the entire inner periphery of the cross-section of the stator to provide a continuous examination of the entire inner surface of the stator, and recording the effect of heat radiation received by the sensor to dEtermine the presence of overheated areas of the stator.
Claim 2
Independent Claim
115 words
A method for examining annular active-steel stator packs for an electric machine comprising heating the active steel of a stator pack, introducing an infrared heat sensor and optical receiver into the bore of the stator pack, uniformly moving said infrared heat sensor and optical receiver along the axis of the stator pack while rotating the optical receiver within the stator pack so that heat radiation is received by the sensor from the entire inner periphery of the cross-section of the stator to provide a continuous examination of the entire inner surface of the stator, and recording the effect of heat radiation received by the sensor to dEtermine the presence of overheated areas of the stator.
Claim 3
Dependent Claim
51 words
A method as claimed in claim 1 wherein the recording of the effect of radiation at the entire inner surface of the stator is obtained in the form of a chart made to scale, the contrast areas of the chart serving to determine the coordinates and shape of the overheated areas.
Claim 4
Dependent Claim
37 words
A method as claimed in claim 2 comprising measuring the heat radiation at the entire inner surface of the stator pack repeatedly, the depth and intensity of overheated areas being determined through contrast variation of said chart.
Claim 5
Dependent Claim
52 words
A method as claimed in claim 1 wherein the heat sensor is moved within the stator pack by mounting the sensor on a carriage which is longitudinally displaced along the axis of the stator pack while the optical receiver is continuously rotated on said carriage around the axis of the stator pack.
Claim 6
Dependent Claim
140 words
Apparatus for examining the interior surfaces of annular stator packs for electrical machines, said apparatus comprising a carriage including means for displacement of the carriage longitudinally within the interior of an annular stator pack, a rotatable casing supported by said carriage, an infrared radiation sensing head fixably mounted on said carriage, optical means carried by said casing and positioned for transmitting thermal radiation from the interior surface of the annular stator pack to said sensing head, means for driving said casing in rotation so that as the carriage is longitudinally displaced in the stator pack and the casing is driven in rotation the entire inner periphery of the annular stator pack is continuously scanned and its temperature measured, and recording means coupled to said sensing head for providing a correlated record of the thermal radiation received by the sensing head.
Claim 7
Dependent Claim
140 words
Apparatus for examining the interior surfaces of annular stator packs for electrical machines, said apparatus comprising a carriage including means for displacement of the carriage longitudinally within the interior of an annular stator pack, a rotatable casing supported by said carriage, an infrared radiation sensing head fixably mounted on said carriage, optical means carried by said casing and positioned for transmitting thermal radiation from the interior surface of the annular stator pack to said sensing head, means for driving said casing in rotation so that as the carriage is longitudinally displaced in the stator pack and the casing is driven in rotation the entire inner periphery of the annular stator pack is continuously scanned and its temperature measured, and recording means coupled to said sensing head for providing a correlated record of the thermal radiation received by the sensing head.
Claim 8
Dependent Claim
31 words
Apparatus as claimed in claim 5 wherein said optical means comprises an objective, and a scanning mirror carried by said casing and positioned to transmit heat energy to said sensing head.
Claim 9
Dependent Claim
23 words
Apparatus as claimed in claim 6 comprising means for adjusting the relative position of said sensing head and the mirror to effect focussing.
Claim 10
Dependent Claim
22 words
Apparatus as claimed in claim 5 wherein said carriage includes at least two radial spur legs each including two longitudinally spaced wheels.
Claim 11
Dependent Claim
32 words
Apparatus as claimed in claim 8 wherein said two spur legs are so angled that the wheels thereon ride along respective spaced generatix lines of the inner surface of the stator pack.
Claim 12
Dependent Claim
27 words
Apparatus as claimed in claim 5 wherein said recording means comprises amplification means connected to said sensing head, and a signal recorder connected to said amplification means.
References Cited (Backward Citations)
US3501380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |