Patent US4335619A successfully refreshed from Google Patents.
US4335619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor load test apparatus
Assignee: Siemens Energy Inc
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Filing: 1980-03-05
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Granted: 1982-06-22
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Expires: 2000-03-05
Abstract
Abstract This invention provides a unique system for measuring torque and speed characteristics of motors. This invention employs the principle of driving an induction generator beyond its synchronous speed until it generates power fed back into the power supply. Thus, a test motor can be loaded to its full load potential and only the losses of the test motor, generator, and other components are supplied by the power distribution system. Consequently, a substantial savings in cost are obtained compared to other conventional motor testing apparatus.
Inventors
- 👤 Donald A. Wetzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:30
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/16; G01L3/22; G01R; G01R31/00; G01R31/34; G01R31/343
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A motor test apparatus comprising: a first coupling means for connecting a test motor thereto; a second coupling means connected to the first coupling means; a controllable slip means connected to the second coupling means; an induction generator connected to the controllable slip means; starting means for supplying an electrical power system to the test motor and induction generator; the test motor being disposed to drive the first coupling means at a first speed and torque; the second coupling means being disposed to increase the first speed and torque to a second speed and torque; the controllable slip means being disposed to drive the induction generator until it generates power back into the electrical power system and loads the test motor to a full load speed.
Claim 2
Dependent Claim
126 words
A motor test apparatus comprising: a first coupling means for connecting a test motor thereto; a second coupling means connected to the first coupling means; a controllable slip means connected to the second coupling means; an induction generator connected to the controllable slip means; starting means for supplying an electrical power system to the test motor and induction generator; the test motor being disposed to drive the first coupling means at a first speed and torque; the second coupling means being disposed to increase the first speed and torque to a second speed and torque; the controllable slip means being disposed to drive the induction generator until it generates power back into the electrical power system and loads the test motor to a full load speed.
Claim 3
Dependent Claim
23 words
A motor test apparatus as recited in claim 1 where the first coupling means is comprised of torque measuring and speed monitoring means.
Claim 4
Dependent Claim
26 words
A motor test apparatus as recited in claim 1 where the second coupling means is comprised of a gear unit with a 1.0 to 1.1 ratio.
Claim 5
Dependent Claim
61 words
A motor test apparatus as recited in claim 1 where the controllable slip means is comprised of an eddy current clutch having a constant speed input shaft and variable speed output shaft, wherein said constant speed input shaft is connected to the output shaft of the second coupling means, and said variable speed output shaft is connected to the induction generator.
Claim 6
Dependent Claim
22 words
A motor test apparatus as recited in claim 1 further comprising metering means to measure the power generated by the induction generator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |