US3898546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state synchronizer system which uses the zero crossing point of a syncro output as a reference
Assignee: Bell Helicopter Textron Inc
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Filing: 1974-05-10
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Granted: 1975-08-05
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Expires: 1994-05-10
Abstract
Abstract A synchronizer system where a positioned synchro transmitter has a rotor excited from an a.c. source and a demodulator operating by momentarily sampling the output of the transmitter once every n cycles of the voltage from the a.c. source where n is greater than 1. An integrator is responsive to the pulsed output of the demodulator with a feedback network responsive to the integrator for controlling the instant of sampling the output to null the output voltage. The integrator may be latched at any phase angle thereafter to cause production of an error signal from the demodulator proportional to further relative rotation in the transmitter.
Inventors
- 👤 Delbert E Haskins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:54
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/28
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
81 words
A synchronizer system comprising: a. a synchro transmitter having a gyro controlled rotor and excited from an a.c. source, b. a demodulator adapted momentarily to sample the output of said transmitter once every n cycles of the voltage from said a.c. source where n is greater than 1, c. an integrator responsive to the pulsed output of said demodulator, and d. a feedback network responsive to said integrator for controlling the instant of sampling said output to null said output voltage.
Claim 2
Dependent Claim
81 words
A synchronizer system comprising: a. a synchro transmitter having a gyro controlled rotor and excited from an a.c. source, b. a demodulator adapted momentarily to sample the output of said transmitter once every n cycles of the voltage from said a.c. source where n is greater than 1, c. an integrator responsive to the pulsed output of said demodulator, and d. a feedback network responsive to said integrator for controlling the instant of sampling said output to null said output voltage.
Claim 3
Dependent Claim
32 words
The combination set forth in claim 1 in which means are provided to latch said integrator in a given condition and simultaneously produce an error signal from the output of said integrator.
Claim 4
Dependent Claim
28 words
The combination set forth in claim 1 in which manually operable means are provided to change the condition of said integrator independent of the output of said demodulator.
Claim 5
Dependent Claim
11 words
The combination set forth in claim 1 in which n 2.
Claim 6
Dependent Claim
28 words
The combination set forth in claim 1 in which means responsive to the output of said integrator automatically resets said integrator when the condition thereof exceeds predetermined limits.
Claim 7
Dependent Claim
43 words
The combination set forth in claim 1 in which said integrator comprises a capacitor to store a charge thereon proportional to the output of said demodulator and in which the sample instant for said demodulator is dependent upon the voltage across said capacitor.
Claim 8
Dependent Claim
111 words
A synchronizer for operation with a control transducer having a stator excited from a voltage source at a given frequency to produce from a rotor an output voltage at said frequency of continuously variable phase in response to continuous relative rotation between said stator and said rotor, which comprises: a. control means automatically responsive during a synchronization mode to a phase referencE signal derived from said voltage source to sample said output voltage only at times corresponding to its zero axis crossing for relative rotation up to and exceeding 360*, and b. selector means operable to establish an engage mode to prevent change in the phase of sampling said output voltage.
Claim 9
Dependent Claim
111 words
A synchronizer for operation with a control transducer having a stator excited from a voltage source at a given frequency to produce from a rotor an output voltage at said frequency of continuously variable phase in response to continuous relative rotation between said stator and said rotor, which comprises: a. control means automatically responsive during a synchronization mode to a phase referencE signal derived from said voltage source to sample said output voltage only at times corresponding to its zero axis crossing for relative rotation up to and exceeding 360*, and b. selector means operable to establish an engage mode to prevent change in the phase of sampling said output voltage.
Claim 10
Dependent Claim
67 words
The combination set out in claim 7 wherein there is provided: control means automatically to track the zero crossing of said output voltage as said rotor and said stator change relative positions, and means to latch said control means to arrest further tracking of said zero crossing and to cause development of an error signal proportional to relative movement between said rotor and said stator after latching.
Claim 11
Dependent Claim
38 words
The combination set out in claim 8 wherein said stator is mounted on an airframe, a gyro stabilizes said rotor and an autopilot actuator means for said airframe is connected at its error input to said output terminal.
Claim 12
Dependent Claim
110 words
A synchronizer to produce an error signal in response to rotation on a given axis of a sensor which comprises: a. a phase demodulator means responsive to said sensor to produce output signal pulses dependent upon phase variations of the demodulator input relative to a phase reference, b. an integrator circuit connected through a switch to the output of said demodulator, c. means operable at a given rate periodically to sample said demodulator to control the charge on said integrator, and d. means responsive to the charge on said integrator to change the phase of the instant at which said demodulator is sampled and null the output of said demodulator.
Claim 13
Dependent Claim
110 words
A synchronizer to produce an error signal in response to rotation on a given axis of a sensor which comprises: a. a phase demodulator means responsive to said sensor to produce output signal pulses dependent upon phase variations of the demodulator input relative to a phase reference, b. an integrator circuit connected through a switch to the output of said demodulator, c. means operable at a given rate periodically to sample said demodulator to control the charge on said integrator, and d. means responsive to the charge on said integrator to change the phase of the instant at which said demodulator is sampled and null the output of said demodulator.
Claim 14
Dependent Claim
125 words
A solid state synchronizer to produce an error signal in response to rotation on a given axis of a sensor which comprises: a. means to produce an error signal from said sensor which may vary above and below a reference level depending upon the phase of the signal from said sensor, b. a differential amplifier having said error signal applied to one input thereof, c. an integrator connected at its input through a switch from the output of said differential amplifier and at its output to the second input of said differential amplifier, d. means selectively to open and close said switch, and e. an output circuit extending from the output of said differential amplifier to provide an error signal when said switch is nonconductive.
Claim 15
Dependent Claim
125 words
A solid state synchronizer to produce an error signal in response to rotation on a given axis of a sensor which comprises: a. means to produce an error signal from said sensor which may vary above and below a reference level depending upon the phase of the signal from said sensor, b. a differential amplifier having said error signal applied to one input thereof, c. an integrator connected at its input through a switch from the output of said differential amplifier and at its output to the second input of said differential amplifier, d. means selectively to open and close said switch, and e. an output circuit extending from the output of said differential amplifier to provide an error signal when said switch is nonconductive.
Claim 16
Dependent Claim
104 words
A synchronizer responsive to a variable phase demodulated signal which comprises: a. a differential amplifier connected at one input terminal to receive said demodulated signal, b. a second differential amplifier connected at one input to the output of said first differential amplifier by way of a switch and an integrating resistor, c. an integrating capacitor connected across said second differential amplifier, d. means to connect the output of said second differential amplifier to the second input of said first differential amplifier, and e. an output error signal circuit leading from said first differential amplifier to transmit an error signal when said switch is nonconductive.
Claim 17
Dependent Claim
104 words
A synchronizer responsive to a variable phase demodulated signal which comprises: a. a differential amplifier connected at one input terminal to receive said demodulated signal, b. a second differential amplifier connected at one input to the output of said first differential amplifier by way of a switch and an integrating resistor, c. an integrating capacitor connected across said second differential amplifier, d. means to connect the output of said second differential amplifier to the second input of said first differential amplifier, and e. an output error signal circuit leading from said first differential amplifier to transmit an error signal when said switch is nonconductive.
Claim 18
Dependent Claim
32 words
The combination set forth in claim 12 in which manual control means are provided for selectively adding or removing charge from said capacitor independent of the output of said first differential amplifier.
Claim 19
Independent Claim
135 words
A method synchronizing a phase reference with the rotor of a control transducer having a stator excited from a voltage source at a given frequency to produce from said rotor an output voltage at said frequency of continuously variable phase in response to continuous relative rotation between said stator and said rotor, which comprises: a. automatically responding during a synchronization mode to a phase reference signal derived from said voltage source to sample said output voltage only at times corresponding to its zero axis crossing for any relative rotation between said stator and rotor up to and exceeding 360*, and b. establishing an engage moDe by preventing change in the phase of sampling said output voltage whereby said output voltage sampled at a fixed phase is representative of said relative rotation during said engage mode.
Claim 20
Independent Claim
135 words
A method synchronizing a phase reference with the rotor of a control transducer having a stator excited from a voltage source at a given frequency to produce from said rotor an output voltage at said frequency of continuously variable phase in response to continuous relative rotation between said stator and said rotor, which comprises: a. automatically responding during a synchronization mode to a phase reference signal derived from said voltage source to sample said output voltage only at times corresponding to its zero axis crossing for any relative rotation between said stator and rotor up to and exceeding 360*, and b. establishing an engage moDe by preventing change in the phase of sampling said output voltage whereby said output voltage sampled at a fixed phase is representative of said relative rotation during said engage mode.
Claim 21
Dependent Claim
106 words
In a synchronizer the method of establishing a reference phase angle for producing an error signal in response to rotation on a given axis of a sensor which comprises: phase demodulating the output of said sensor by producing output signal pulses dependent upon phase variations of a demodulator input signal relative to a phase reference signal, integrating the output of said demodulator, periodically sampling the output of said demodulator to control a charge in said integrator, and in response to the charge on said integrator changing the phase of the instant at which said demodulator is sampled in direction to null the output of said demodulator.
Claim 22
Dependent Claim
106 words
In a synchronizer the method of establishing a reference phase angle for producing an error signal in response to rotation on a given axis of a sensor which comprises: phase demodulating the output of said sensor by producing output signal pulses dependent upon phase variations of a demodulator input signal relative to a phase reference signal, integrating the output of said demodulator, periodically sampling the output of said demodulator to control a charge in said integrator, and in response to the charge on said integrator changing the phase of the instant at which said demodulator is sampled in direction to null the output of said demodulator.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |