Patent US3573793A successfully refreshed from Google Patents.
US3573793A
Expired / Lapsed
US
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Shaft encoder employing phase shifter device
Assignee: Jungner Instrument AB
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Filing: 1966-12-05
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Granted: 1971-04-06
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Expires: 1986-12-05
Abstract
Abstract In a method and apparatus for generating digital information concerning the angular position of the rotor of a phase shifter, such as a resolver or a synchro, in which a multiphase AC voltage is supplied to the phase shifter to produce a rotating magnetic field which induces a secondary AC voltage of the same frequency as the supply voltage at a phase angle proportional to the angular position of the rotor, the simultaneous readout of a large number of phase shifters can be obtained by frequency dividing a control AC voltage of a predetermined frequency to form a plurality of AC voltages, forming the multiphase AC voltage and a code which varies cyclically with the same frequency as the multiphase AC voltage from the plurality of AC voltages, whereby the position of the vector of the rotating magnetic field derived from the multiphase AC voltage corresponds to a given value of the code at any given moment; and forming readout pulse at substantially given moment; and forming readout pulse at substantially the zero transition of the secondary voltage to thereby produce a readout or registration of the cyclic code.
Inventors
- 👤 Gunnar Axel Kihlberg
- 👤 Bo Hogstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:28
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/66; H03M1/665
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
In a method of generating digital information concerning the angular position of the rotor of a phase shifter, wherein a multiphase AC voltage is supplied to said phase shifter to produce therein a rotating magnetic field which induces secondary AC voltages of the same frequency as said multiphase AC voltage and at a phase shift angle proportional to the angular position of said rotor, the improvement comprising subjecting a control AC voltage of a predetermined frequency to successive frequency division to produce a plurality of AC voltages, combining said plurality of AC voltages to form said multiphase AC voltage and forming a code which varies cylindrically with the same frequency as said multiphase AC voltage from said plurality of AC voltages, whereby the position of the vector of the rotating magnetic field produced by said multiphase AC voltage corresponds to a certain value of said code at any given moment; and forming a readout pulse substantially at the zero transition of said secondary voltage to thereby cause readout or registration of said code.
Claim 2
Dependent Claim
173 words
In a method of generating digital information concerning the angular position of the rotor of a phase shifter, wherein a multiphase AC voltage is supplied to said phase shifter to produce therein a rotating magnetic field which induces secondary AC voltages of the same frequency as said multiphase AC voltage and at a phase shift angle proportional to the angular position of said rotor, the improvement comprising subjecting a control AC voltage of a predetermined frequency to successive frequency division to produce a plurality of AC voltages, combining said plurality of AC voltages to form said multiphase AC voltage and forming a code which varies cylindrically with the same frequency as said multiphase AC voltage from said plurality of AC voltages, whereby the position of the vector of the rotating magnetic field produced by said multiphase AC voltage corresponds to a certain value of said code at any given moment; and forming a readout pulse substantially at the zero transition of said secondary voltage to thereby cause readout or registration of said code.
Claim 3
Dependent Claim
69 words
The method of claim 1, wherein the AC voltages derived from the control voltage form a binary N-unit code, the frequency of said control voltage being selected to be 2N 1f and the code voltages derived from the frequency of said control voltage having the frequencies 2N 2f, 2N 2f....., 22f, 2f, and f, respectively, wherein the frequency of the multiphase voltage is equal to the frequency of f.
Claim 4
Dependent Claim
193 words
In an apparatus for generating digital information concerning the angular position of the rotor of a phase shifter including a voltage supply unit for producing a multiphase voltage to be applied to at least one phase shifter to produce a rotating magnetic field therein which induces a secondary AC voltage in a secondary winding of said phase shifter having a phase shift angle proportional to the angular position of the phase shifter rotor, the improvement comprising a source of a control voltage of a predetermined frequency whose output is electrically connected to said voltage supply unit, frequency division means forming a part of said voltage supply unit to produce a number of AC voltages from said control voltage, which include said multiphase voltage and a code which varies cyclically with the same frequency as said multiphase AC voltage; and a pulse generator means connected to the output of each phase shifter; said pulse generator including means for forming readout pulses substantially at the zero transitions of the secondary AC voltage induced in secondary winding of said phase shifter and supply said pulses to readout means for a readout or registration of said code.
Claim 5
Dependent Claim
193 words
In an apparatus for generating digital information concerning the angular position of the rotor of a phase shifter including a voltage supply unit for producing a multiphase voltage to be applied to at least one phase shifter to produce a rotating magnetic field therein which induces a secondary AC voltage in a secondary winding of said phase shifter having a phase shift angle proportional to the angular position of the phase shifter rotor, the improvement comprising a source of a control voltage of a predetermined frequency whose output is electrically connected to said voltage supply unit, frequency division means forming a part of said voltage supply unit to produce a number of AC voltages from said control voltage, which include said multiphase voltage and a code which varies cyclically with the same frequency as said multiphase AC voltage; and a pulse generator means connected to the output of each phase shifter; said pulse generator including means for forming readout pulses substantially at the zero transitions of the secondary AC voltage induced in secondary winding of said phase shifter and supply said pulses to readout means for a readout or registration of said code.
Claim 6
Dependent Claim
32 words
The apparatus according to claim 3 wherein the secondary windings of the phase shifter are angularly spaced in relation to each other by 360*/n where n designates the number (of) secondary windings.
Claim 7
Dependent Claim
34 words
The apparatus according to claim 3 wherein two phase shifters from a coarse-fine system in which a certain phase shift of the coarse rotor corresponds to a multiple phase shift of the fine rotor.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |