US3614616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional ac tachometer
Assignee: FINCOR Inc
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Filing: 1969-11-10
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Granted: 1971-10-19
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Expires: 1989-11-10
Abstract
Abstract An alternating current tachometer and circuit in which an AC tachometer generator has two 90* out-of-phase windings independently connected through rectifiers, with outputs connected in parallel to provide a DC output potential. Using a large number of poles in the AC generator results in DC with a low ripple component. A reversing relay in the bridge output circuit applies the DC to an output signal terminal at a positive or negative level (relative to a common lead) depending upon and hence indicative of the direction of rotation of the tachometer generator. An electric circuit controls the relay condition in response to correlation of the two out-of-phase alternating signals, the signals being independently detected at their zero crossover point. The control circuit detects, differentiates, accomplishes a comparison gating of the out-of-phase signals and provides one or the other of two control signals which, via a register, controls the relay condition to provide the DC potential representing one or the other direction of generator rotation. Regardless of polarity, the amplitude of the DC voltage output will be indicative of rate of rotation.
Inventors
- 👤 Jiri B Bucek
- 👤 James R Shultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:59
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46; G01P13/00; G01P13/02; G01P13/04; G01P13/045
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
176 words
An electronic signal producing device comprising: first circuit means having means responsive to rotation of a rotating body for producing at least a two phase AC signal and a rectifying circuit for rectifying each of the individual phase output signals providing a related DC potential on output terminals, said DC potential being proportional to the speed of said rotating body; additional electronic circuit means connected to (both) said (AC signal producing means) means for producing said AC signals and said rectifying means having circuits for independently detecting said two AC phase signals, then shaping, differentiating and (cross comparing the shaped and differentiated signals) determining the relative phase relationship of said output signals to selectively alternatively provide one or the other of two control signals indicative respectively of opposite directions of out-of-phase relationship of said two AC phase signals, and means responsive to said two control signals for reversing the DC polarity on said output terminals, whereby said DC output has amplitude values indicative of speed and polarity values indicative of direction of rotation of said body.
Claim 2
Dependent Claim
176 words
An electronic signal producing device comprising: first circuit means having means responsive to rotation of a rotating body for producing at least a two phase AC signal and a rectifying circuit for rectifying each of the individual phase output signals providing a related DC potential on output terminals, said DC potential being proportional to the speed of said rotating body; additional electronic circuit means connected to (both) said (AC signal producing means) means for producing said AC signals and said rectifying means having circuits for independently detecting said two AC phase signals, then shaping, differentiating and (cross comparing the shaped and differentiated signals) determining the relative phase relationship of said output signals to selectively alternatively provide one or the other of two control signals indicative respectively of opposite directions of out-of-phase relationship of said two AC phase signals, and means responsive to said two control signals for reversing the DC polarity on said output terminals, whereby said DC output has amplitude values indicative of speed and polarity values indicative of direction of rotation of said body.
Claim 3
Dependent Claim
195 words
A bidirectional, alternating current tachometer comprising: an AC generator having a rotor and a stator providing at least two out-of-phase alternating current signals whose relative phase is related to the direction of said rotor; rectifier means connected to said generator to (independently) rectify each of said two AC signals and providing a common direct current output signal proportional to the speed of said rotor circuit; said DC output circuit having switching means for reversing the polarity of the DC output; electronic means connected between said generator and said rectifier means for independently detecting each of the two out-of-phase AC signals, said electronic means including means for generating a related square wave signal for each out-of-phase AC signal, and independently differentiating each square wave signal, (cross comparison) individually gating each square wave signal with the differential signal of the other square wave signal to alternatively provide one to two independent trigger signals indicative respectively of opposite directions of out-of-phase relationships of said AC signal; and electronic means, responsive to one or the other of said trigger signals, connected to control said switching means to alternatively provide the DC output signal circuit with normal or reverse polarity.
Claim 4
Dependent Claim
195 words
A bidirectional, alternating current tachometer comprising: an AC generator having a rotor and a stator providing at least two out-of-phase alternating current signals whose relative phase is related to the direction of said rotor; rectifier means connected to said generator to (independently) rectify each of said two AC signals and providing a common direct current output signal proportional to the speed of said rotor circuit; said DC output circuit having switching means for reversing the polarity of the DC output; electronic means connected between said generator and said rectifier means for independently detecting each of the two out-of-phase AC signals, said electronic means including means for generating a related square wave signal for each out-of-phase AC signal, and independently differentiating each square wave signal, (cross comparison) individually gating each square wave signal with the differential signal of the other square wave signal to alternatively provide one to two independent trigger signals indicative respectively of opposite directions of out-of-phase relationships of said AC signal; and electronic means, responsive to one or the other of said trigger signals, connected to control said switching means to alternatively provide the DC output signal circuit with normal or reverse polarity.
Claim 5
Dependent Claim
101 words
An AC tachometer as defined in claim 2, wherein a terminal is provided common to said two phase windings and additional terminals are provided on the opposite sides of each phase winding; said rectifier means comprises a pair of rectifier bridges, each bridge being energized in accordance with the output between said common terminal and a separate one of said additional terminals and connections for connecting the outputs of said rectifiers in parallel with a balancing series resistor network bridging the parallel outputs of said bridges, and providing a common ground level at an intermediate point in said series resistor network.
Claim 6
Dependent Claim
33 words
An AC tachometer as defined in claim 2, wherein said electronic means for detecting, shaping, differentiating and gating comprises solid state circuits and means provide rectification of said differentiated signals during crosscomparison gating.
Claim 7
Dependent Claim
61 words
An AC tachometer as defined in claim 2, wherein the amplitude of said DC potential is indicative of speed, said electronic circuit has means which provide DC signal pulses on independent circuits indicative of both speed and direction of rotation, and said electronic circuit controls the polarity of said DC potential to provide a condition indicative of direction of generator rotation.
Claim 8
Independent Claim
218 words
A system for measuring and providing signals indicative of speed and direction of rotation of a rotatable body comprising: a multiphase generator connected to rotate with said body having at least two phase windings with a terminal on the opposite side of each phase winding; a pair of rectifier units, each unit being connected to and energized in accordance with the level of AC signal output between said common terminal and a separate one of said additional terminals, connections for connecting the variable lever DC outputs of said rectifier units with a balancing resistor means, a switching device having means for reversing the polarity of the DC output and appearing at said output terminal means; and means for actuating said switching device responsive to the phase sequence relationship of the two AC inputs for actuating said switching device to one condition when one of the input phase of the AC signals leads the other In timed sequence and for reversing said switching device to its other condition when the other input phase of the AC signals leads said one input phase to thereby provide DC output signals at said output terminal means of one polarity responsive to one direction of rotation of said generator and of another polarity responsive to the opposite direction of rotation of said generator.
Claim 9
Independent Claim
218 words
A system for measuring and providing signals indicative of speed and direction of rotation of a rotatable body comprising: a multiphase generator connected to rotate with said body having at least two phase windings with a terminal on the opposite side of each phase winding; a pair of rectifier units, each unit being connected to and energized in accordance with the level of AC signal output between said common terminal and a separate one of said additional terminals, connections for connecting the variable lever DC outputs of said rectifier units with a balancing resistor means, a switching device having means for reversing the polarity of the DC output and appearing at said output terminal means; and means for actuating said switching device responsive to the phase sequence relationship of the two AC inputs for actuating said switching device to one condition when one of the input phase of the AC signals leads the other In timed sequence and for reversing said switching device to its other condition when the other input phase of the AC signals leads said one input phase to thereby provide DC output signals at said output terminal means of one polarity responsive to one direction of rotation of said generator and of another polarity responsive to the opposite direction of rotation of said generator.
Claim 10
Dependent Claim
119 words
In a measuring system as defined in claim 6, said switching device is a double pole-double throw relay, and said means for actuating said switching devices comprising: a solid-state phase detecting control circuit having a circuit for detecting the zero crossover point for each of said AC voltage phases, circuitry for individually shaping, differentiating and rectifying the two signals and gating and control circuitry to compare shaped signals with differentiated signals to obtain a selected one of two isolated output signals dependent upon the direction of generator rotation; and bistable electronic circuitry responsive to a signal on one or the other of said two isolated outputs to control said relay respectively to each of its normal and reversing conditions.
Claim 11
Dependent Claim
20 words
In a measuring system as defined in claim 7, each of said rectifier units being full wave diode bridge rectifiers.
Claim 12
Dependent Claim
74 words
An AC tachometer comprising: a rectifier circuit; an AC generator having at least two phase windings connected through said rectifier circuit to provide a DC output whose potential has an amplitude indicative of speed; and an electronic circuit including means for measuring the relative phase of the AC signals from each of said phase windings and providing DC output signals on independent circuits representative of both speed and direction of rotation of said generator.
Claim 13
Dependent Claim
74 words
An AC tachometer comprising: a rectifier circuit; an AC generator having at least two phase windings connected through said rectifier circuit to provide a DC output whose potential has an amplitude indicative of speed; and an electronic circuit including means for measuring the relative phase of the AC signals from each of said phase windings and providing DC output signals on independent circuits representative of both speed and direction of rotation of said generator.
Claim 14
Dependent Claim
42 words
An AC tachometer as defined in claim 11, wherein said electronic circuit includes means connected to the output of said rectifier circuit to control its output polarity in response to said DC output signals indicative of direction of rotation of said generator.
References Cited (Backward Citations)
FR1284743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |