Patent US3710220A successfully refreshed from Google Patents.
US3710220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor speed regulation
Assignee: Schneider Electric Buildings Americas Inc
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Filing: 1971-07-15
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Granted: 1973-01-09
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Expires: 1991-07-15
Abstract
Abstract A variable direct voltage obtained from a motor-driven tachometer generator is connected in series with a voltage divider across a fixed direct reference voltage to provide a feedback voltage as a function of a preselected position on the voltage divider to regulate the speed of the motor driving the generator.
Inventors
- 👤 A Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:35
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
A motor speed regulating system comprising a motor, a source of electric current energizing said motor, current amplitude modulating means in series with the motor to control said current, means coupled to the motor for producing a variable alternating voltage proportional in amplitude to the speed of said motor, a rectifier, a capacitor, said rectifier and said capacitor in series with the means for producing alternating voltage to provide across said capacitor a direct feedback voltage variable in proportion to said motor speed, a source of fixed direct reference voltage, a voltage divider, said voltage divider and said capacitor in series across said source of reference voltage with the sum of the feedback and the reference voltages across said voltage divider, a selectable setpoint position on the voltage divider, a control terminal on said current modulating means, and means fixedly coupling said setpoint position to the control terminal whereby the current is controlled in amplitude as a linear function of the voltage at said setpoint position.
Claim 2
Dependent Claim
166 words
A motor speed regulating system comprising a motor, a source of electric current energizing said motor, current amplitude modulating means in series with the motor to control said current, means coupled to the motor for producing a variable alternating voltage proportional in amplitude to the speed of said motor, a rectifier, a capacitor, said rectifier and said capacitor in series with the means for producing alternating voltage to provide across said capacitor a direct feedback voltage variable in proportion to said motor speed, a source of fixed direct reference voltage, a voltage divider, said voltage divider and said capacitor in series across said source of reference voltage with the sum of the feedback and the reference voltages across said voltage divider, a selectable setpoint position on the voltage divider, a control terminal on said current modulating means, and means fixedly coupling said setpoint position to the control terminal whereby the current is controlled in amplitude as a linear function of the voltage at said setpoint position.
Claim 3
Dependent Claim
26 words
A motor speed regulating system according to claim 1 wherein said source of alternating voltage comprises an alternating voltage tachometer generator mechanically coupled to the motor.
Claim 4
Dependent Claim
25 words
A motor speed regulating system according to claim 1 wherein said reference direct voltage source comprises a voltage regulator in a direct voltage supply circuit.
Claim 5
Dependent Claim
17 words
A motor speed regulating system according to claim 3 wherein said voltage regulator compriseS a Zener diode.
Claim 6
Dependent Claim
44 words
A motor speed regulating system according to claim 1 wherein said means coupling the selectable position to said control terminal comprises an amplifier, an input of said amplifier coupled to the selectable position, and an output of said amplifier coupled to the control terminal.
Claim 7
Dependent Claim
25 words
A motor speed regulating system according to claim 5 additionally comprising a feedback network means for connecting a signal from said output to the input.
Claim 8
Dependent Claim
34 words
A motor speed regulating system according to claim 6 wherein said feedback network means comprised a selected resistance whereby said motor speed deviates from a predetermined no-load speed as a function of motor torque.
Claim 9
Dependent Claim
17 words
A motor speed regulating system according to claim 1 wherein said current control means comprises a transistor.
Claim 10
Dependent Claim
156 words
For use in a system to regulate the speed of a motor energized by an electric current in response to an alternating voltage input proportional in amplitude to the speed of said motor, a control circuit comprising means for controlling amplitude of the current through the motor, a rectifier and a capacitor in series receiving said input and producing across the capacitor a variable direct feedback voltage proportional to said motor speed, means for supplying a fixed direct reference voltage, a voltage divider and said capacitor in series across the means for supplying reference voltage with the sum of the feedback and the reference voltages across the voltage divider, a selectable setpoint position on the voltage divider, a control terminal on said means for controlling current, and means fixedly coupling said setpoint position to the control terminal whereby the amplitude of said current is controlled as a linear function of the voltage of said setpoint position.
Claim 11
Dependent Claim
156 words
For use in a system to regulate the speed of a motor energized by an electric current in response to an alternating voltage input proportional in amplitude to the speed of said motor, a control circuit comprising means for controlling amplitude of the current through the motor, a rectifier and a capacitor in series receiving said input and producing across the capacitor a variable direct feedback voltage proportional to said motor speed, means for supplying a fixed direct reference voltage, a voltage divider and said capacitor in series across the means for supplying reference voltage with the sum of the feedback and the reference voltages across the voltage divider, a selectable setpoint position on the voltage divider, a control terminal on said means for controlling current, and means fixedly coupling said setpoint position to the control terminal whereby the amplitude of said current is controlled as a linear function of the voltage of said setpoint position.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |