US3651402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supervisory apparatus
Assignee: Honeywell Inc
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Filing: 1969-01-27
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Granted: 1972-03-21
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Expires: 1989-01-27
Abstract
Abstract 1. The method of testing a hysteresis synchronous motor having a rotor and a pair of stator windings the first of which is energized directly from an alternating voltage source and the second of which is energized from the source through a capacitor, which comprises the steps of energizing the motor, monitoring the phase angle relation between the alternating voltage across said second winding and a reference alternating voltage of preset fixed phase, and confirming the presence in said relation of a characteristic representative of satisfactory motors.
Inventors
- 👤 Paul H Leffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:35
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; H; H02; H02K; H02K19/00; H02K19/02; H02K19/04; H02K19/08; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
The method of testing a hysteresis synchronous motor having a rotor and a pair of stator windings the first of which is energized directly from an alternating voltage source and the second of which is energized from the source through a capacitor, which comprises the steps of energizing the motor, monitoring the phase angle relation between the alternating voltage across said second winding and a reference alternating voltage of preset fixed phase, and confirming the presence in said relation of a characteristic representative of satisfactory motors.
Claim 2
Independent Claim
86 words
The method of testing a hysteresis synchronous motor having a rotor and a pair of stator windings the first of which is energized directly from an alternating voltage source and the second of which is energized from the source through a capacitor, which comprises the steps of energizing the motor, monitoring the phase angle relation between the alternating voltage across said second winding and a reference alternating voltage of preset fixed phase, and confirming the presence in said relation of a characteristic representative of satisfactory motors.
Claim 3
Dependent Claim
21 words
The method of claim 1 in which said characteristic comprises a sudden rapid shift of 5* as synchronous speed is achieved.
Claim 4
Dependent Claim
18 words
The method of claim 1 in which said characteristic comprises a small oscillation when synchronous speed is achieved.
Claim 5
Dependent Claim
46 words
The method of claim 1 with the further preliminary steps of first operating the motor at synchronous speed, then setting the phase angle of the reference voltage, with respect to the signal voltage, at a predetermined value, then deenergizing the motor to bring it to rest.
Claim 6
Dependent Claim
136 words
In combination: a hysteresis synchronous motor having a first winding energized directly from a source of alternating voltage and a second winding reactively energized from said source, the phase of the voltage across said second winding varying as the motor varies in speed; means connected to said motor for deriving, from the voltage across said second winding, pulses of undirectional current synchronized with one of the peaks thereof; gating means adjustably synchronized with the voltage across said first winding for deriving from said pulses a unidirectional signal which is of a first sense when the motor is running at less than synchronous speed, and which reverses in sense as the motor reaches synchronous speed; and indicating means energized with said unidirectional signal so that the indication thereof varies with variation in the speed of said motor.
Claim 7
Dependent Claim
136 words
In combination: a hysteresis synchronous motor having a first winding energized directly from a source of alternating voltage and a second winding reactively energized from said source, the phase of the voltage across said second winding varying as the motor varies in speed; means connected to said motor for deriving, from the voltage across said second winding, pulses of undirectional current synchronized with one of the peaks thereof; gating means adjustably synchronized with the voltage across said first winding for deriving from said pulses a unidirectional signal which is of a first sense when the motor is running at less than synchronous speed, and which reverses in sense as the motor reaches synchronous speed; and indicating means energized with said unidirectional signal so that the indication thereof varies with variation in the speed of said motor.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |