US3721973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed monitoring apparatus
Assignee: Honeywell Inc
•
Filing: 1969-12-15
•
Granted: 1973-03-20
•
Expires: 1989-12-15
Abstract
Abstract The arrangement provides a novel method of selectively monitoring the hunt frequency of the synchronous spin motors of several gyros to determine the proper operation of the selected gyro. Two signals are used from each gyro for such monitoring action: (1) the phased winding voltage, and (2) the spin motor excitation voltage, of the split phase or two phase motor that drives the gyro rotor. Summing of the phased winding voltage and the excitation voltage for the line winding produces an amplitude modulated carrier wave, modulated proportional to the hunt phase shift of the rotor. The resultant modulation envelope is detected, filtered, band pass amplified and thereafter converted to a threshold logic voltage for an indication that the gyro spin motors are at synchronous speed.
Inventors
- 👤 G Sundbert
- 👤 E Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:52
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; G01P3/00; G01P3/42; G01P3/56; G01P3/565
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A motor hunting operation detector for a split phase AC motor having a rotor, a line winding and a phased winding, comprising: first means for receiving a signal indicative of the phase of the line winding voltage; second means for receiving a signal indicative of the phase of the phased winding voltage; summing means operably connected to said first and second means for summing the phase indicative signals from said first and second means, thereby producing an amplitude modulated carrier wave of the line winding voltage frequency proportional to the hunt phase shift of the phased winding voltage, and a phase detector means receiving the amplitude modulated carrier wave and Detecting and transmitting the envelope of the carrier wave.
Claim 2
Dependent Claim
119 words
A motor hunting operation detector for a split phase AC motor having a rotor, a line winding and a phased winding, comprising: first means for receiving a signal indicative of the phase of the line winding voltage; second means for receiving a signal indicative of the phase of the phased winding voltage; summing means operably connected to said first and second means for summing the phase indicative signals from said first and second means, thereby producing an amplitude modulated carrier wave of the line winding voltage frequency proportional to the hunt phase shift of the phased winding voltage, and a phase detector means receiving the amplitude modulated carrier wave and Detecting and transmitting the envelope of the carrier wave.
Claim 3
Dependent Claim
33 words
The apparatus of claim 1, and a band pass filter for passing the hunting frequency of the motor connected to the detector and thereby transmitting primarily the hunt frequency of said modulation envelope.
Claim 4
Dependent Claim
42 words
The apparatus of claim 1, wherein the phase detector means comprises a silicon controlled rectifier (SCR) with a means for selectively turning it on, a filter for the carrier frequency voltage and a trap to prevent filtering of the hunt frequency voltage.
Claim 5
Dependent Claim
35 words
The apparatus of claim 2, a logic output arrangement, and means transmitting the output of the hunt frequency filter to the logic arrangement and providing an output therefrom for significant magnitudes of the hunt frequency.
Claim 6
Dependent Claim
28 words
The apparatus of claim 4 wherein the logic arrangement comprises a semi-conductor SCR which is gated to an on condition for significant hunting amplitudes of said spin motor.
Claim 7
Dependent Claim
38 words
The apparatus of claim 1 wherein the phased detector means comprises an SCR to provide multiple monitoring of a plurality of spin motors and which SCR also functions as the envelope detector of the amplitude modulated carrier wave.
Claim 8
Dependent Claim
110 words
A motor hunting operation detector for a split phase AC motor having a rotor, a line winding and a phased winding, comprising: first means for receiving a signal indicative of the phase of the line winding voltage, said first means being connected to receive the line winding voltage; second means for receiving a signal indicative of the phase of the phased winding voltage; and summing means operably connected to said first and second means for summing the phase indicative signal from said first and second means, thereby producing an amplitude modulated carrier wave of the line winding voltage frequency proportional to the hunt phase shift of the phased winding voltage.
Claim 9
Dependent Claim
110 words
A motor hunting operation detector for a split phase AC motor having a rotor, a line winding and a phased winding, comprising: first means for receiving a signal indicative of the phase of the line winding voltage, said first means being connected to receive the line winding voltage; second means for receiving a signal indicative of the phase of the phased winding voltage; and summing means operably connected to said first and second means for summing the phase indicative signal from said first and second means, thereby producing an amplitude modulated carrier wave of the line winding voltage frequency proportional to the hunt phase shift of the phased winding voltage.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |