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US3594625A
Expired / Lapsed
US
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Dual speed motor control
Assignee: Acme Steel Co
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Filing: 1969-08-29
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Granted: 1971-07-20
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Expires: 1989-08-29
Abstract
Abstract A motor control circuit for operating a motor at a high speed and a substantially slower speed than the high speed which includes a plurality of relay operated switches which are selectively operated to operate the motor either in the fast forward or reverse directions or in the slow forward or reverse directions. A zero speed switch acts in conjunction with a time delay switch to operate the motor in the slow forward or reverse direction by continuously shutting off and starting the motor. The motor may be of the dual rotor AC induction-type and relay circuitry is provided to rapidly decrease the speed of the motor from the high speed to the slower speed by reversing the motor.
Inventors
- 👤 Raymond H Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:53
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
270 words
A motor circuit for operating an AC induction motor at a high speed and at a speed which is substantially slower than said high speed, said circuit comprising: first and second power supply conductor means for supplying said motor with high and lower voltage power, respectively, a control circuit having a first slow speed branch, a second high speed branch and a third branch, said first and second branches including slow and high speed operating switch means, respectively, speed switch means in said third branch which close in response to the speed of said motor when said speed increases above a predetermined speed, first, second and third switching means operable by said first, second and third branches, respectively, when the circuit through said branches is completed, said first switching means including means which completes a circuit in said second conductor means and said third branch when said first switching means is energized, said second switching means including means which completes a circuit in said first conductor means and breaks the circuit in said first branch when said second switching means is energized, said third switching means including means which breaks the circuit in said first branch and completes a circuit between said first and third branches when said third switching means is energized, and time delay means associated with said third switching means for maintaining said third switching means energized for a predetermined time after said speed switch means opens, said time delay means and said speed switch means successively opening and closing the circuit to the motor through said second conductor when the slow speed operating switch is closed.
Claim 2
Dependent Claim
270 words
A motor circuit for operating an AC induction motor at a high speed and at a speed which is substantially slower than said high speed, said circuit comprising: first and second power supply conductor means for supplying said motor with high and lower voltage power, respectively, a control circuit having a first slow speed branch, a second high speed branch and a third branch, said first and second branches including slow and high speed operating switch means, respectively, speed switch means in said third branch which close in response to the speed of said motor when said speed increases above a predetermined speed, first, second and third switching means operable by said first, second and third branches, respectively, when the circuit through said branches is completed, said first switching means including means which completes a circuit in said second conductor means and said third branch when said first switching means is energized, said second switching means including means which completes a circuit in said first conductor means and breaks the circuit in said first branch when said second switching means is energized, said third switching means including means which breaks the circuit in said first branch and completes a circuit between said first and third branches when said third switching means is energized, and time delay means associated with said third switching means for maintaining said third switching means energized for a predetermined time after said speed switch means opens, said time delay means and said speed switch means successively opening and closing the circuit to the motor through said second conductor when the slow speed operating switch is closed.
Claim 3
Dependent Claim
85 words
The circuit of claim 1 wherein said control circuit includes a fourth reverse branch and a fifth forward branch, said fourth and fifth branches including reverse and forward operating switch means, and fourth and fifth switching means which are alternatively operated by said fourth and fifth branches when said branches are energized, said fourth and fifth switching means each having means for completing the circuit through said first and second conductor means and being selectively operable to reverse the direction of rotation of the motor.
Claim 4
Dependent Claim
75 words
The circuit of claim 2 including sixth switching means, switch means for energizing said sixth switching means in response to the closing of said speed switch means when the speed of said motor exceeds said predetermined speed, said sixth switching means having means which interconnects said fourth and fifth branches when said sixth switching means is energized for deenergizing one and energizing the other of said fourth and fifth switching means to reverse the motor.
Claim 5
Dependent Claim
37 words
The circuit of claim 3 wherein the switch means which is responsive to the closing of said speed switch means energizes said sixth switching means from said first branch when said slow operating switch means is closed.
Claim 6
Dependent Claim
23 words
The circuit of claim 3 including limit switch means in said second branch which energizes said sixth switching means from said second branch.
Claim 7
Dependent Claim
27 words
The circuit of claim 3 wherein said switch means which is responsive to the closing of said speed switch means is operated by said second switching means.
Claim 8
Dependent Claim
33 words
The circuit of claim 3 wherein the means of said second switching means also completes a circuit between said second switching means and said third branch when said speed switch means is closed.
Claim 9
Dependent Claim
177 words
A circuit for operating an AC induction motor at a high speed and at a speed which is substantially slower than said high speed, comprising in combination: a dual rotor induction motor having a first rotor anD a second freely spinning rotor between the stator of the motor and said first rotor, a first circuit and switching means for operating said motor at said fast speed, a second circuit and switching means for operating said motor at said substantially slower speed, said second circuit including speed switch means which are responsive to the speed of said motor to shut said motor off when the speed reaches a predetermined speed, and time delay means in said second circuit for maintaining said motor in said shut off condition for a predetermined time after the speed of said motor falls below said predetermined speed, said time delay means restarting said motor after said predetermined time has elapsed, said time delay means and said speed switch means continuously and successively turning said motor on and off at said substantially slower speed.
Claim 10
Dependent Claim
177 words
A circuit for operating an AC induction motor at a high speed and at a speed which is substantially slower than said high speed, comprising in combination: a dual rotor induction motor having a first rotor anD a second freely spinning rotor between the stator of the motor and said first rotor, a first circuit and switching means for operating said motor at said fast speed, a second circuit and switching means for operating said motor at said substantially slower speed, said second circuit including speed switch means which are responsive to the speed of said motor to shut said motor off when the speed reaches a predetermined speed, and time delay means in said second circuit for maintaining said motor in said shut off condition for a predetermined time after the speed of said motor falls below said predetermined speed, said time delay means restarting said motor after said predetermined time has elapsed, said time delay means and said speed switch means continuously and successively turning said motor on and off at said substantially slower speed.
Claim 11
Dependent Claim
56 words
The circuit of claim 8 including a third circuit and switching means for operating said motor in opposite directions, and fourth switching means operating said third circuit and third switching means when said first and second switching means are deenergized and energized respectively for reversing said motor to rapidly slow said motor to said predetermined speed.
Claim 12
Dependent Claim
56 words
The circuit of claim 3 wherein said sixth switching means reverses said fourth and fifth switching means and the polarity of the power in said first high voltage power supply conductor means instantaneously when the high speed operating switch means are opened and the slow speed operating switch means are closed to rapidly slow the motor.
References Cited (Backward Citations)
US3078406A
Cited
US3140068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |