Patent US3689816A successfully refreshed from Google Patents.
US3689816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase and speed control of a dc motor
Assignee: Eresa SA
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Filing: 1970-08-26
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Granted: 1972-09-05
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Expires: 1990-08-26
Abstract
Abstract A control device for controlling the speed of an electric motor characterized by means for forming a reference signal having a frequency corresponding to the desired speed and to the desired angular position of the motor, means for forming a signal the frequency of which corresponds to the actual speed and angular position of the motor, and means for comparing the signals and controlling the motor according thereto.
Inventors
- 👤 Henri Matthey
- 👤 Jean-Jacques Bessire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:59
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; H02P5/00; H02P5/46; H02P5/52; H02P5/56; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/291
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
227 words
A control device comprising: circuit means delivering a DC reference velocity signal; reference frequency means delivering an AC reference frequency signal; generator means driven by a motor and delivering an AC generator signal corresponding to the actual speed and phase of the motor; phase responsive circuit means fed by said AC reference frequency signal and by the AC generator signal said phase responsive circuit means having a first position signal output and a second position signal output and being responsive to the phase difference between said AC reference frequency signal and said AC generator signal to produce corresponding DC voltage differences between said position signal outputs; circuit means including a rectifier and a filtering capacitor fed by the AC generator signal and delivering a DC velocity signal corresponding to the actual speed of the motor; differential amplifier means fed on the one hand by the sum of the DC reference velocity signal and the first position signal output, and on the other hand by the sum of the actual DC velocity signal and the second position signal output; said differential amplifier means delivering a DC control voltage the amplitude of which controls the energy supplied to the motor; and power amplifier means for said DC control voltage, a stabilizing circuit connected in parallel with said capacitor fed by the intermediary of a rectifier by the generator means.
Claim 2
Dependent Claim
227 words
A control device comprising: circuit means delivering a DC reference velocity signal; reference frequency means delivering an AC reference frequency signal; generator means driven by a motor and delivering an AC generator signal corresponding to the actual speed and phase of the motor; phase responsive circuit means fed by said AC reference frequency signal and by the AC generator signal said phase responsive circuit means having a first position signal output and a second position signal output and being responsive to the phase difference between said AC reference frequency signal and said AC generator signal to produce corresponding DC voltage differences between said position signal outputs; circuit means including a rectifier and a filtering capacitor fed by the AC generator signal and delivering a DC velocity signal corresponding to the actual speed of the motor; differential amplifier means fed on the one hand by the sum of the DC reference velocity signal and the first position signal output, and on the other hand by the sum of the actual DC velocity signal and the second position signal output; said differential amplifier means delivering a DC control voltage the amplitude of which controls the energy supplied to the motor; and power amplifier means for said DC control voltage, a stabilizing circuit connected in parallel with said capacitor fed by the intermediary of a rectifier by the generator means.
Claim 3
Dependent Claim
18 words
Device according to claim 1 characterized by the fact that this stabilizing circuit is an electronic discharge circuit.
Claim 4
Dependent Claim
241 words
A control device comprising: circuit means delivering a DC reference velocity signal; reference frequency means delivering an AC reference frequency signal; generator means driven by a motor and delivering an AC generator signal corresponding to the actual speed and phase of the motor; phase responsive circuit means fed by said AC reference frequency signal and by the AC generator signal said phase responsive circuit means having a first position signal output and a second position signal output and being responsive to the phase difference between said AC reference frequency signal and said AC generator signal to produce corresponding DC voltage differences between said position signal outputs; circuit means including a rectifier and a filtering capacitor fed by the AC generator signal and delivering a DC velocity signal corresponding to the actual speed of the motor; differential amplifier means fed on the one hand by the sum of the DC reference velocity signal and the first position signal output, and on the other hand by the sum of the actual DC velocity signal and the second position signal output; said differential amplifier means delivering a DC control voltage the amplitude of which controls the energy supplied to the motor; and power amplifier means for said DC control voltage, and stabilizing circuit means in said circuit means comprising a transistor in parallel with said filtering capacitor, said transistor permitting the discharge of said capacitor when a heavy perturbation occurs in the control loop.
Claim 5
Dependent Claim
241 words
A control device comprising: circuit means delivering a DC reference velocity signal; reference frequency means delivering an AC reference frequency signal; generator means driven by a motor and delivering an AC generator signal corresponding to the actual speed and phase of the motor; phase responsive circuit means fed by said AC reference frequency signal and by the AC generator signal said phase responsive circuit means having a first position signal output and a second position signal output and being responsive to the phase difference between said AC reference frequency signal and said AC generator signal to produce corresponding DC voltage differences between said position signal outputs; circuit means including a rectifier and a filtering capacitor fed by the AC generator signal and delivering a DC velocity signal corresponding to the actual speed of the motor; differential amplifier means fed on the one hand by the sum of the DC reference velocity signal and the first position signal output, and on the other hand by the sum of the actual DC velocity signal and the second position signal output; said differential amplifier means delivering a DC control voltage the amplitude of which controls the energy supplied to the motor; and power amplifier means for said DC control voltage, and stabilizing circuit means in said circuit means comprising a transistor in parallel with said filtering capacitor, said transistor permitting the discharge of said capacitor when a heavy perturbation occurs in the control loop.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |