US3843913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed regulating arrangement for dc motors
Assignee: Buehler GmbH
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Filing: 1971-05-18
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Granted: 1974-10-22
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Expires: 1991-05-18
Abstract
Abstract An arrangement for maintaining constant the speed of DC motors. The motor is mechanically coupled to a generator the electrical output of which is added to a reference voltage. A power transistor is connected in series with the motor through its emitter-collector path. The power transistor may be driven by a preamplifying transistor stage. A regulating transistor applies the signal for the power transistor to the preamplifying stage. The power transistor varies the motor current as a result of its conducting state. An auxiliary voltage source connected to the motor provides voltage potential dependent upon the motor load. This potential is applied through the feed-back circuit including the regulating transistor, to the power transistor, in order to vary the conducting state of the latter in accordance with the motor load.
Inventors
- 👤 G Schaub
- 👤 D Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:24
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/93
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
341 words
An arrangement for stabilizing the speed of a D.C. motor, comprising, in combination, first controllable electronic impedance means connected in the current path of the motor and having first control input means; second controllable electronic impedance means including output means connected to said first control input means and operatIve for controlling the impedance of said first impedance means in dependence upon the impedance of said second impedance means to thereby influence the speed of said motor, said second controllable electronic impedance means having respective second control input means, and said second impedance means further including impedance-monitoring means for generating a monitoring signal varying in dependence upon changes in the impedance of said second impedance means; speed-monitoring means coupled to the motor and operative for generating a speed signal varying in dependence upon motor speed, said speedmonitoring means including means coupled to the motor for producing a variable alternating voltage proportional in amplitude to the speed of said motor, a rectifier, a capacitor, a source of fixed direct reference voltage, a voltage divider having an adjustable tap, said voltage divider and said rectifier being connected in series with the means for producing alternating voltage and said capacitor being connected between said tap and one terminal of said source of fixed direct reference voltage, to provide across said voltage divider a direct feedback voltage variable in proportion to said motor speed; negative-feedback means connecting said tap to said control input means for applying to the latter a speed-dependent negative-feedback signal to vary the impedance of said second impedance means in response to changes in motor speed and accordingly vary the impedance of said first impedance means and cause changes in said monitoring signal indirectly indicative of changes in motor current, and also connecting said impedancemonitoring means to said second control input means for influencing said negative-feedback signal in indirect dependence upon changes in motor current, said negative-feedback means including electrical damping means operative for reducing the negative-feedback stabilizing action of said negative-feedback means in response to sudden and short-lasting changes in motor speed.
Claim 2
Dependent Claim
341 words
An arrangement for stabilizing the speed of a D.C. motor, comprising, in combination, first controllable electronic impedance means connected in the current path of the motor and having first control input means; second controllable electronic impedance means including output means connected to said first control input means and operatIve for controlling the impedance of said first impedance means in dependence upon the impedance of said second impedance means to thereby influence the speed of said motor, said second controllable electronic impedance means having respective second control input means, and said second impedance means further including impedance-monitoring means for generating a monitoring signal varying in dependence upon changes in the impedance of said second impedance means; speed-monitoring means coupled to the motor and operative for generating a speed signal varying in dependence upon motor speed, said speedmonitoring means including means coupled to the motor for producing a variable alternating voltage proportional in amplitude to the speed of said motor, a rectifier, a capacitor, a source of fixed direct reference voltage, a voltage divider having an adjustable tap, said voltage divider and said rectifier being connected in series with the means for producing alternating voltage and said capacitor being connected between said tap and one terminal of said source of fixed direct reference voltage, to provide across said voltage divider a direct feedback voltage variable in proportion to said motor speed; negative-feedback means connecting said tap to said control input means for applying to the latter a speed-dependent negative-feedback signal to vary the impedance of said second impedance means in response to changes in motor speed and accordingly vary the impedance of said first impedance means and cause changes in said monitoring signal indirectly indicative of changes in motor current, and also connecting said impedancemonitoring means to said second control input means for influencing said negative-feedback signal in indirect dependence upon changes in motor current, said negative-feedback means including electrical damping means operative for reducing the negative-feedback stabilizing action of said negative-feedback means in response to sudden and short-lasting changes in motor speed.
Claim 3
Dependent Claim
124 words
An arrangement as defined in claim 1, wherein said first controllable electronic impedance means comprises a first transistor having an emitter-collector path connected in series in the motor current path and having a base constituting said first control input means, and wherein said second controllable electronic impedance means comprises a second transistor having an emitter-collector path and having a base constituting said second control input means, and wherein said impedance monitoring means comprises a monitoring resistor connected is series with the emitter-collector path of said second transistor, and wherein said second transistor has one output electrode connected to the base of said first transistor for controlling the conductivity of said first transistor in dependance upon the voltage at the base of said second transistor.
Claim 4
Dependent Claim
77 words
An arrangement as defined in claim 2, wherein said second transistor has another output electrode connected to one terminal of said monitoring resistor and wherein said monitoring resistor has another terminal, and wherein said negative-feedback means further includes a third transistor having a base connected to said tap, one output electrode connected to the base of said second transistor for controlling the latter and having another output electrode connected to said other terminal of said monitoring resistor.
Claim 5
Dependent Claim
60 words
An arrangement as defined in claim 2, and further including a voltage source having two terminals, said monitoring resistor having one terminal connected to one terminal of said source and having another terminal, and wherein said source of reference voltage comprises a Zener diode connected between said other terminal of said monitoring resistor and said base of said second transistor.
Claim 6
Dependent Claim
36 words
An arrangement as defined in claim 4, wherein said negative-feedback means further includes a third transistor having a base connected to said tap and having an output electrode connected to the base of said second transistor.
Claim 7
Dependent Claim
48 words
An arrangement as defined in claim 4, wherein the electrode of said Zener diode not connected to said monitoring resistor is connected to one terminal of a further resistor, with the other terminal of said further resistor being connected directly to the other terminal of said voltage source.
Claim 8
Dependent Claim
39 words
An arrangement as defined in claim 6, wherein said second impedance means further includes an additional resistor also connected in the emitter-collector path of said first transistor and forming a junction with said other terminal of said monitoring resistor.
Claim 9
Dependent Claim
106 words
An arrangement as defined in claim 2, and further including a voltage source having two terminals, said monitoring resistor having one terminal connected to one terminal of said source and having another terminal, and wherein said negative-feedback means comprises a third transistor having an output electrode connected to the base of said second transistor for controlling said second transistor, and said third transistor also having a base connected to said tap, and resistor means connecting said other terminal of said monitoring resistor to said base of said third transistor for transmitting variations in the voltage across said monitoring resistor to said base of said third transistor.
Claim 10
Dependent Claim
19 words
An arrangement as defined in claim 8, wherein said resistor means consists of a plurality of discrete resistor elements.
Claim 11
Dependent Claim
42 words
An arrangement as defined in claim 9, wherein said plurality of discrete resistor elements comprises two resistor elements defining a junction, and wherein said damping means further includes a capacitor connected between said just-mentioned junction and said base of said second transistor.
Claim 12
Dependent Claim
17 words
An arrangement as defined in claim 8, wherein said resistor means consists of a single resistor element.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |