Patent US3638480A successfully refreshed from Google Patents.
US3638480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-stator induction motor torque sensor ac dynamometer
Assignee: Caterpillar Global Mining LLC
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Filing: 1969-11-21
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Granted: 1972-02-01
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Expires: 1989-11-21
Abstract
Abstract A dual-stator induction motor has a rotor and a stator, which has two segments mounted for relative rotatable adjustment. The rotatable stator segment has a gear sector on it which meshes with a pinion of an actuator motor. The stator segments are energized from a three-phase line. Stator current and voltage are inductively sensed by a watts transducer the output of which is connected to an ammeter. The watts transducer originates at its output an electrical signal proportional to primary watts which accurately reflects torque output. An embodiment of the invention is employed as a dynamometer.
Inventors
- 👤 Romeo T Calud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:57
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; G; G01; G01L; G01L3/00; G01L3/16; G01L3/22; G01R; G01R31/00; G01R31/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A method for measuring the torque output of a dual-stator induction motor having at least two relatively rotatably adjustable stator segments energized by an AC source and a common rotor, the method comprising the steps of sensing the total electrical power flowing into said stator segments by means of a transducer; and generating an electrical output signal in said transducer proportional to said power into said stator segments which output signal is substantially linearly related to the torque of said motor.
Claim 2
Independent Claim
81 words
A method for measuring the torque output of a dual-stator induction motor having at least two relatively rotatably adjustable stator segments energized by an AC source and a common rotor, the method comprising the steps of sensing the total electrical power flowing into said stator segments by means of a transducer; and generating an electrical output signal in said transducer proportional to said power into said stator segments which output signal is substantially linearly related to the torque of said motor.
Claim 3
Dependent Claim
33 words
A method as set forth in claim 1 wherein said output signal is transmitted to an indicator calibrated to translate said electrical output signal to an indication of torque output of said motor.
Claim 4
Dependent Claim
117 words
A dynamometer for measuring the torque output of a test machine, the combination comprising: a dual-stator induction motor having at least two relatively rotatably adjustable stator segments and a rotor connected through an output shaft to said test machine; an actuator mechanically lined to said relatively rotatably adjustable stator segments and adapted to relatively rotatably adjust said stator segments; a control for controlling the operation of said actuator; a watts transducer connected to measure the total electrical power into said stator segments and generate a DC electrical output signal proportional thereto; and indicator means connected to receive said watts transducer DC output signal and calibrated to provide a visual indication of torque output of said test motor.
Claim 5
Dependent Claim
117 words
A dynamometer for measuring the torque output of a test machine, the combination comprising: a dual-stator induction motor having at least two relatively rotatably adjustable stator segments and a rotor connected through an output shaft to said test machine; an actuator mechanically lined to said relatively rotatably adjustable stator segments and adapted to relatively rotatably adjust said stator segments; a control for controlling the operation of said actuator; a watts transducer connected to measure the total electrical power into said stator segments and generate a DC electrical output signal proportional thereto; and indicator means connected to receive said watts transducer DC output signal and calibrated to provide a visual indication of torque output of said test motor.
Claim 6
Dependent Claim
69 words
A dynamometer as set forth in claim 3, wherein said dual-stator induction motor has two substantially equal stator segments and one of said stator segments is rotatably adjustable relative to the other of said two stator segments; said actuator is a rotary actuator connected to rotate said relatively rotatably adjustable stator segment; and said control is a manual control connected to said rotary actuator to control said rotary actuator.
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |