US3777244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control device for a d.c. motor
Assignee: Olympus Corp
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Filing: 1972-07-12
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Granted: 1973-12-04
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Expires: 1992-07-12
Abstract
Abstract A speed control device of a D.C. motor including a comparator for detecting voltage corresponding to the rotation speed of the D.C. motor from the detection terminal of a bridge circuit having one of its arms connected to the D.C. motor and comparing the voltage thus detected with the reference voltage so as to control the amount of current running through a power supply control transistor disposed between the power supply terminal of the bridge circuit and the D.C. power source and maintain the rotation speed of the D.C. motor, characterized in that said speed control device comprises a reference voltage generating circuit consisting of a field effect transistor and a reference voltage across the reference resistor.
Inventors
- 👤 S Kosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:11
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; Y10S388/934
Claims Analysis
Total Claims: 64
Claim 1
Independent Claim
199 words
Apparatus for controlling the rotational speed of a DC motor comprising: a bridge circuit having the motor as one arm of the bridge and resistors as the other arms, one opposite pair of bridge terminals being first and second detection terminals and the other pair of opposite terminals being power supply terminals connected to a DC power source; a power supply control transistor having its emitter-collector path connected between the DC power source and one of said power supply terminals; comparator means connected between said first and second detection terminals to detect voltage corresponding to the rotational speed of the DC motor and to compare the detected voltage with a reference voltage; a reference voltage generating circuit connected to between said comparator means and said DC power source and including a field effect transistor having its source and gate interconnected so that said drain is supplied with a substantially constant predetermined current and a reference resistor connected in series with said field effect transistor so that a reference voltage appears across said reference resistor; and means connecting said comparator means and the base of said power supply control transistor for controlling the flow of current through said control transistor.
Claim 2
Dependent Claim
199 words
Apparatus for controlling the rotational speed of a DC motor comprising: a bridge circuit having the motor as one arm of the bridge and resistors as the other arms, one opposite pair of bridge terminals being first and second detection terminals and the other pair of opposite terminals being power supply terminals connected to a DC power source; a power supply control transistor having its emitter-collector path connected between the DC power source and one of said power supply terminals; comparator means connected between said first and second detection terminals to detect voltage corresponding to the rotational speed of the DC motor and to compare the detected voltage with a reference voltage; a reference voltage generating circuit connected to between said comparator means and said DC power source and including a field effect transistor having its source and gate interconnected so that said drain is supplied with a substantially constant predetermined current and a reference resistor connected in series with said field effect transistor so that a reference voltage appears across said reference resistor; and means connecting said comparator means and the base of said power supply control transistor for controlling the flow of current through said control transistor.
Claim 3
Dependent Claim
55 words
The apparatus according to claim 2 wherein said comparator means includes a comparison transistor having base emitter and collector sections, said emitter being connected to one of said first and second detection terminals, said collector being connected to the base of said power supply control transistor and said base being supplied with said reference voltage.
Claim 4
Dependent Claim
46 words
The apparatus according to claim 2 wherein said comparison transistor has its emitter connected to said first detection terminal and its base to said second detection terminal through said reference resistor and also on one side of the DC power source through said field effect transistor.
Claim 5
Dependent Claim
57 words
The apparatus according to claim 3 wherein said reference resistor is a variable resistor including first and second resistance varying terminals; said comparison transistor has its emitter connected to said first detection terminal and its base to said first resistance varying terminal; and said field effect transistor has its gate connected to said second resistance varying terminal.
Claim 6
Dependent Claim
37 words
The apparatus according to claim 3 wherein the said comparison transistor has its collector connected to the base of the said power supply control transistor and also to the collector of said transistor through its bias resistor.
Claim 7
Dependent Claim
20 words
The apparatus according to claim 5 wherein the said field effect transistor has its source directly connected to its gate.
Claim 8
Dependent Claim
23 words
The apparatus according to claim 5 wherein the said field effect transistor has its source connected to its gate through a source resistor.
Claim 9
Dependent Claim
20 words
The apparatus according to claim 3 wherein the said field effect transistor has its source directly connected to its gate.
Claim 10
Dependent Claim
23 words
The apparatus according to claim 3 wherein the said field effect transistor has its source connected to its gate through a source resistor.
Claim 11
Dependent Claim
24 words
The apparatus according to claim 3 wherein the said comparison transistor has its base connected to the source of the said field effect transistor.
Claim 12
Dependent Claim
24 words
The apparatus according to claim 3 wherein the said comparison transistor has its base connected to the drain of the said field effect transistor.
Claim 13
Dependent Claim
45 words
The apparatus according to claim 2 wherein said comparison transistor has its emitter connected to said first detection terminal and its base to said second detection terminal through said reference resistor and also to one of said power supply terminals through said field effect transistor.
Claim 14
Dependent Claim
20 words
The apparatus according to claim 12 wherein the said field effect transistor has its source directly connected to its gate.
Claim 15
Dependent Claim
23 words
The apparatus according to claim 12 wherein the said field effect transistor has its source connected to its gate through a source resistor.
Claim 16
Dependent Claim
24 words
The apparatus according to claim 12 wherein the said comparison transistor has its base connected to the source of the said field effect transistor.
Claim 17
Dependent Claim
24 words
The apparatus according to claim 12 wherein the said comparison transistor has its base connected to the drain of the said field effect transistor.
Claim 18
Dependent Claim
57 words
The apparatus according to claim 12 wherein said reference resistor is a variable resistor including first and second resistance varying terminals; said comparison trnsistor has its emitter connected to said first detection terminal and its base to said first resistance varying terminal; and said field effect transistor has its gate connected to said second resistance varying terminal.
Claim 19
Dependent Claim
46 words
The apparatus according to claim 2 wherein said comparison transistor has its emitter connected to said second detection terminal, and its base to said first detection terminal through said reference resistor, and also to one side of the DC power source through said field effect transistor.
Claim 20
Dependent Claim
39 words
The apparatus according to claim 18 wherein the said comparison transistor has its collector connected to the base of the said power supply control transistor and also to the collector of said control transistor through the bias resistor thereof.
Claim 21
Dependent Claim
20 words
The apparatus according to claim 19 wherein the said field effect transistor has its source directly connected to its gate.
Claim 22
Dependent Claim
23 words
The apparatus according to claim 19 wherein the said field effect transistor has its source connected to its gate through a source resistor.
Claim 23
Dependent Claim
23 words
The apparatus according to claim 21 including motor speed resistor is connected between the base and collector of said power supply control transistor.
Claim 24
Dependent Claim
19 words
The apparatus according to claim 18 wherein said field effect transistor has its source directly connected to its gate.
Claim 25
Dependent Claim
22 words
The apparatus according to claim 18 wherein said field effect transistor has its source connected to its gate through a source resistor.
Claim 26
Dependent Claim
23 words
The apparatus according to claim 18 wherein said comparison transistor has its base connected to the source of the said field effect transistor.
Claim 27
Dependent Claim
24 words
The appartus according to claim 18 wheren the said comparison transistor has its base connected to the drain of the said field effect transisor.
Claim 28
Dependent Claim
57 words
The apparatus according to claim 18 wherein said reference resistor is a variable resistor including first and second resistance varying terminals; said comparison transistor has its emitter connected to said second detection terminal and its base to said first resistance varying terminal; and said field effect transistor has its gate connected to said second resistance varying terminal.
Claim 29
Dependent Claim
24 words
The apparatus according to claim 27 including a motor speed control resistor connected between the base and collector of said power supply control transistor.
Claim 30
Dependent Claim
35 words
The apparatus according to claim 2 wherein said comparison transistor has its Emitter connected to said second detection terminal, and said field effect transistor has its drain connected to one of the power supply terminals.
Claim 31
Dependent Claim
20 words
The apparatus according to claim 29 wherein the said field effect tansistor has its source directly connected to its gate.
Claim 32
Dependent Claim
22 words
The apparatus according to claim 29 wherein said field effect transistor has its source conected to its gate through a source resistor.
Claim 33
Dependent Claim
27 words
The apparatus according to claim 2 wherein the said reference reistor of the reference voltage generating circuit is additionally provided with a temperature compensating heat-sensitive resistor element.
Claim 34
Dependent Claim
41 words
The appartus according to claim 32 wherein there is connected between said comparison transistor and power supply control transistor an amplification transistor for reversing the phase of a control signal supplied to said power supply control tranistor from said comparisn transistor.
Claim 35
Dependent Claim
46 words
The apparatus according to claim 33 wherein there are connected between the emitter of the said comparison transistor and the said first detection terminal a parallel circuit consisting of a reference resistor and thermistor and a level adjustment resistor connected in series with said parallel circuit.
Claim 36
Dependent Claim
60 words
The apparatus according to claim 1 wherein said comparator means includes a comparison transistor having base, emitter and collector sections, said base being connected to one of said first and second detection terminals, said collector connected to the base of said power supply control transistor and said emitter conneced to a reference voltage derived from said reference voltage generating circuit.
Claim 37
Dependent Claim
46 words
The apparatus according to claim 35 wherein said comparison transistor has its base connected to said first detection terminal and its emitter connected to said second detection terminal through said reference resistor and also to one of said power supply terminals through said field effect transistor.
Claim 38
Dependent Claim
58 words
The apparatus according to claim 36 wherein said reference resistor is a variable resistor provided with first and second resistance varying terminals; said comparison transistor has its base connected to said first detection terminal and its emitter to said first resistance varying terminal; and said field effect transistor has its gate connected to said second resistance varying terminal.
Claim 39
Dependent Claim
26 words
The apparatus according to claim 37 wherein the motor speed control resistor is connected between the base and collector of the said power supply control transistor.
Claim 40
Dependent Claim
35 words
The apparatus according to claim 36 wherein said comparison transistor has its collector connected to the base of said power supply control transistor and also to the collector thereof through a motor speed control resistor.
Claim 41
Dependent Claim
19 words
The apparatus according to claim 39 wherein said field effect transistor has its source directly connected to its gate.
Claim 42
Dependent Claim
22 words
The apparatus according to claim 39 wherein said field effect transistor has its source connected to its gate through a source resistor.
Claim 43
Dependent Claim
19 words
The apparatus according to claim 36 wherein said field effect transistor has its source directly connected to its gate.
Claim 44
Dependent Claim
22 words
The appartus according to claim 36 wherein said field effect transistor has its source connected to its gate through a source resistor.
Claim 45
Dependent Claim
23 words
The apparatus according to claim 36 wherein said comparison transistor has its emitter connected to the source of the said field effect transistor.
Claim 46
Dependent Claim
23 words
The apparatus according to claim 35 wherein the said comparison transistor has its emitter connected to the drain of said field effect transistor.
Claim 47
Dependent Claim
50 words
The apparatus according to claim 35 wherein the said comparison transistor has its base connected to the said second detection terminal and its emitter connected to the said first detection terminal through said reference resistor and also to one end of the D.C. power source through said field effect transistor.
Claim 48
Dependent Claim
58 words
The apparatus according to claim 46 wherein said reference resistor is a variable resistor provided with First and second resistance varying terminals; said comparison transistor has its base connected to said second detection terminal and its emitter to said first resistance varying terminal; and said field effect transistor has its gate connected to said second resistance varying terminal.
Claim 49
Dependent Claim
19 words
The apparatus according to claim 46 wherein said field effect transistor has its source directly connected to its gate.
Claim 50
Dependent Claim
22 words
The apparatus according to claim 46 wherein said field effect transistor has its source connected to its gate through a source resistor.
Claim 51
Dependent Claim
24 words
The apparatus according to claim 49 wherein a bias resistor is connected between the base and collector of the said power supply control transistor.
Claim 52
Dependent Claim
23 words
The apparatus according to claim 46 wherein said comparison transistor has its emitter connected to the source of the said field effect transistor.
Claim 53
Dependent Claim
22 words
The apparatus according to claim 46 wherein said comparison transistor has its emitter connected to the drain of said field effect transistor.
Claim 54
Dependent Claim
43 words
The apparatus according to claim 35 wherein said comparison transistor has its base connected to the said second detection terminal and its emitter connected to said first detection terminal and also to one of said power supply terminals through said field effect transistor.
Claim 55
Dependent Claim
37 words
The apparatus according to claim 53 wherein the said comparison transistor has its collector connected to the said base of a power supply control transistor and also to the collector thereof through the motor speed control resistor.
Claim 56
Dependent Claim
20 words
The apparatus according to claim 54 wherein the said field effect transistor has its source directly connected to its gate.
Claim 57
Dependent Claim
23 words
The apparatus according to claim 54 wherein the said field effect transistor has its source connected to its gate through a source resistor.
Claim 58
Dependent Claim
20 words
The apparatus according to claim 53 wherein the said field effect transistor has its source directly connected to its gate.
Claim 59
Dependent Claim
23 words
The apparatus according to claim 53 wherein the said field effect transistor has its source connected to its gate through a source resistor.
Claim 60
Dependent Claim
63 words
The apparatus according to claim 53 wherein the said reference resistor is a variable resistor provided with first and second resistance varying terminals; said comparison transistor has its base connected to the said second detection terminal and its emitter to the said first resistance varying terminal; and the said field effect transistor has its gate connected to the said second resistance varying terminal.
Claim 61
Dependent Claim
24 words
The apparatus according to claim 53 wherein the said comparison transistor has its emitter connected to the source of the said field effect transistor.
Claim 62
Dependent Claim
22 words
The apparatus according to claim 53 wherein the comparison transistor has its emitter connected to the drain of the field effect transistor.
Claim 63
Dependent Claim
27 words
The apparatus according to claim 35 wherein the said reference resistor of the reference voltage generating circuit is additionally provided with a temperature compensating heat-sensitive resistor element.
Claim 64
Dependent Claim
42 words
The apparatus according to claim 62 wherein there is connected between the said comparison transistor and power supply control transistor and amplification transistor for reversing the phase of control signals supplied to the said power supply control transistor from said comparison transistor.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |