US3753065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regulating and controlling speed and direction of electric motors and appliance
Assignee: CHILES PATENTS AND SYSTEMS Ltd
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Filing: 1971-10-29
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Granted: 1973-08-14
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Expires: 1991-10-29
Abstract
Abstract A control circuit for a reversible electric motor to be driven from an a.c. supply. Two thyristors are connected on respective sides of the motor in a series circuit including the thyristors, the motor and the a.c. terminals. The thyristors are inversely connected with respect to each other and a potentiometer is connected with respective ends to the thyristor trigger electrodes. A potential divider is connected across the supply terminals and there is a connection between the potential divider and the wiper on the potentiometer.
Inventors
- 👤 S Chiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:35
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; H02P7/03; H02P7/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A control circuit for a reversible electric motor, the circuit comprising: first and second terminals for the motor; first and second terminals for an a.c. supply; a first thyristor connected with its anode/cathode path in series between the first supply terminal and the first motor terminal; a second thyristor connected with its anode/cathode path in series between the second supply terminal and the second motor terminal, the thyristors being inversely connected with respect to the current path from the supply terminal; a diode connected inversely across each thristor; a potentiometer connected with respective ends to the trigger electrodes of the thyristors; a potential divider connected across the supply terminals and a circuit connection between a tap on the potential divider and the wiper of the potentiometer.
Claim 2
Dependent Claim
126 words
A control circuit for a reversible electric motor, the circuit comprising: first and second terminals for the motor; first and second terminals for an a.c. supply; a first thyristor connected with its anode/cathode path in series between the first supply terminal and the first motor terminal; a second thyristor connected with its anode/cathode path in series between the second supply terminal and the second motor terminal, the thyristors being inversely connected with respect to the current path from the supply terminal; a diode connected inversely across each thristor; a potentiometer connected with respective ends to the trigger electrodes of the thyristors; a potential divider connected across the supply terminals and a circuit connection between a tap on the potential divider and the wiper of the potentiometer.
Claim 3
Dependent Claim
30 words
A control circuit as claimed in claim 1 wherein there is a diode in series in the circuit connection connected with its cathode connected to the wiper of the potentiometer.
Claim 4
Dependent Claim
27 words
A control circuit as claimed in claim 1 wherein there is provided an adjustable biasing resistor connected between the cathode and the trigger electrode of each thyristor.
Claim 5
Dependent Claim
20 words
The combination of a control circuit as claimed in claim 1 with an electric motor connected between the motor terminals.
Claim 6
Dependent Claim
30 words
The combination claimed in claim 4 wherein the motor is a universal type motor and Means are provided for supplying the field winding thereof with unidirectional current of either polarity.
Claim 7
Dependent Claim
31 words
The combination claimed in claim 5 wherein the means for supplying the field winding comprises a rectifier arrangement for deriving the unidirectional current from the current supplied to the motor terminals.
Claim 8
Dependent Claim
27 words
The combination as claimed in claim 6 wherein the field winding is connected in a full-wave bridge rectifier circuit consituted by four diodes included in the motor.
Claim 9
Dependent Claim
30 words
The combination claimed in claim 4 wherein the motor is a universal type motor and means are provided for supplying the armature winding thereof with unidirectional current of either polarity.
Claim 10
Dependent Claim
31 words
The combination claimed in claim 8 wherein the means for supplying the armature winding comprises a rectifier arrangement for deriving the unidirectional current from the current supplied to the motor terminals.
Claim 11
Dependent Claim
26 words
The combination as claimed in claim 9 wherein the armature is connected in a full-wave bridge rectifier circuit constituted by four diodes included in the motor.
References Cited (Backward Citations)
US3209227A
Cited
US3214667A
Cited
US3188542A
Cited
US3249838A
Cited
US3568024A
Cited
US3593077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |