US4340853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of testing the windings and insulation system of a motor by applying the test voltage before completing a path to ground
Assignee: McNeil Ohio Corp
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Filing: 1979-10-17
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Granted: 1982-07-20
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Expires: 1999-10-17
Abstract
Abstract An electrically surge protected motor having a submersible housing (10) can be manufactured and tested for insulation weaknesses by first assembling the motor components in the housing (10) without completing a path to ground therethrough. Then the windings (11, 12) of the motor may be subjected to a voltage surge greater than the voltage magnitude at which the motor is to be surge protected. After completion of the test, a path to ground through an impedance device (17) which establishes the voltage magnitude at which the motor is to be protected may be completed. Several alternative grounding devices (23, 24, 25, 26 or 28) may be provided externally of the housing (10).
Inventors
- 👤 John L. Braun
- 👤 Denver W. Smith
- 👤 William J. Ekey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:28
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/346; G01R31/12; H; H02; H02H; H02H9/00; H02H9/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49004
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A method of testing the windings and insulation system of an electrical surge protected motor having a submersible housing in electrical contact with ground comprising the steps of assembling the motor in the housing without providing an electrically conductive path from the motor windings through the housing to ground, subjecting the windings and insulation system of the motor to a voltage greater than the voltage magnitude at which the motor is to be protected in order to test for weaknesses in the insulation system, and testing for the absence of a short circuit between the windings and the housing, and in the event of an absence of a short circuit between the windings and the housing thereafter completing a voltage sensitive electrical conductive path from the motor windings through the housing to ground.
Claim 2
Independent Claim
133 words
A method of testing the windings and insulation system of an electrical surge protected motor having a submersible housing in electrical contact with ground comprising the steps of assembling the motor in the housing without providing an electrically conductive path from the motor windings through the housing to ground, subjecting the windings and insulation system of the motor to a voltage greater than the voltage magnitude at which the motor is to be protected in order to test for weaknesses in the insulation system, and testing for the absence of a short circuit between the windings and the housing, and in the event of an absence of a short circuit between the windings and the housing thereafter completing a voltage sensitive electrical conductive path from the motor windings through the housing to ground.
Claim 3
Dependent Claim
56 words
A method according to claim 1 wherein said step of assembling the motor includes the step of providing an impedance device in said electrical conductive path from the windings to the housing which will conduct only at a voltage magnitude equal to or greater than the voltage magnitude at which the motor is to be protected.
Claim 4
Dependent Claim
23 words
A method according to claim 2 wherein said impedance device is in the path from the motor windings through the housing to ground.
Claim 5
Dependent Claim
31 words
A method according to claim 1 wherein said step of completing a voltage sensitive conducting path from the motor windings through the housing to ground is accomplished externally of the housing.
References Cited (Backward Citations)
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US3867658A
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Cited
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |