US3704401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual motor control
Assignee: INTERN COMPUTER PRODUCTS Inc
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Filing: 1970-07-20
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Granted: 1972-11-28
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Expires: 1990-07-20
Abstract
Abstract A dual motor drive system for synchronously controlling a first motor to drive a first reel and a second motor to drive a second reel to maintain a substantially constant, symmetrical linear velocity of material transferred between said reels as the diameter of the spools material varies as a non-linear function of the amount of material stored thereon. A reference signal is provided which is a function of a desired linear velocity of material transferred between the two reels. A summed signal is provided which varies as a function of the sum of the speeds of the first and second motors. The summed signal is compared with the reference signal to provide an error signal. The power supplied to the first motor driving the first of the two reels, which functions as a take-up reel, is controlled by the error signal, thereby controlling the speed of the motor. A smaller amount of power is supplied to the second motor associated with the second reel functioning as the supply reel to overcome inertia in the system and reduce the effects of coulomb resistance during starting and to provide braking action to maintain tension on the length of material extending between the two spools when running or stopping. Rate of movement of material between the two reels can be controlled or direction of movement reversed by changing the reference signal level or polarity respectively. Upon reduction of rate of movement or reversal, the second motor is driven to provide positive braking action or to change direction of movement as required with the previously driven first motor then operating as a brake.
Inventors
- 👤 Robert N Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:58
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/46; H02P5/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
A motor control for controlling a first motor to drive a first reel to maintain a substantially constant linear velocity of material transferred between said first reel and a second reel as the diameter of the spools of material on said two reels varies as a non-linear function of the amount of material stored thereon comprising: a. means for producing an error signal which varies as a function of the difference between a reference level and the sum of the speed of the two reels; and b. controls means for supplying power to said first motor as a function of said error signal.
Claim 2
Dependent Claim
103 words
A motor control for controlling a first motor to drive a first reel to maintain a substantially constant linear velocity of material transferred between said first reel and a second reel as the diameter of the spools of material on said two reels varies as a non-linear function of the amount of material stored thereon comprising: a. means for producing an error signal which varies as a function of the difference between a reference level and the sum of the speed of the two reels; and b. controls means for supplying power to said first motor as a function of said error signal.
Claim 3
Dependent Claim
111 words
A control as defined in claim 1 wherein said means for producing an error signal comprises first and second sensor means for producing first and second output signals whose amplitude varies as a function of the speed of said first and second reels respectively, means for summing said first and second output signals, reference signal producing means for producing a reference signal which is a function of a desired reference level linear speed of said material transferred between said first and second reels and amplifier means responsive to the difference in amplitude of said reference signal and the sum of said first and second output signals for producing said error signal.
Claim 4
Dependent Claim
33 words
A control as defined in claim 1 wherein said control means comprises a first signal translating device connected for controlling the power applied to said motor as a function of said error signal.
Claim 5
Dependent Claim
35 words
A control as defined in claim 1 further including a second motor connected to drive said second reel and control means for supplying power to said second motor as a function of said error signal.
Claim 6
Dependent Claim
34 words
A control as defined in claim 4 wherein the power supplied to said second motor when material is being transferred from said second reel is less than the power supplied to said first motor.
Claim 7
Dependent Claim
55 words
A control as defined in claim 4 wherein said control means is effective for supplying power to said first and second motors as a function of said error signal only when said error signal is produced as a result of said reference signal being greater than the sum of said first and second output signals.
Claim 8
Dependent Claim
96 words
A control as defined in claim 1 wherein said means for producing an error signal comprises means for producing a first summed signal which is a function of the sum of the speeds of said first and second reels, means for producing a reference signal which is a function of a desired linear speed of material transferred between said first and second reels, and means for producing an error signal as a function of the difference between said reference level and the signal which is a function of the sum of speed of the two reels.
Claim 9
Dependent Claim
71 words
A control as defined in claim 7 wherein said means for producing said summed signal which varies as a function of the sum of the speed of the two reels comprises differential means commonly driven with said first and second reels and tachometer means driven by said summing differential for producing a summed signal which varies as a function of the sum of the Speeds of said first and second reels.
Claim 10
Dependent Claim
59 words
A control as defined in claim 7 wherein said means for producing an error signal comprises first and second tachometers adapted to be driven at speeds which are a function of said first and second reels respectively to produce first and second output signals and means for summing said first and second output signals to produce said summed signal.
Claim 11
Dependent Claim
156 words
A control as defined in claim 4 wherein said control means comprises first and second signal translating devices connected in circuit with said first motor for supplying voltage of one polarity to said first motor when said first signal translating device is enabled and for supplying voltage of a second polarity to said first motor when said second signal translating device is enabled, third and fourth signal translating devices connected in circuit with said second motor for supplying voltage of one polarity to said second motor when said third signal translating device is enabled and for supplying voltage of a second polarity to said second motor when said fourth signal translating device is enabled, and means for enabling said first and third signal translating devices when said reference level is greater than said summed signal and enabling said second and fourth signal translating devices when said summed signal is of greater amplitude than said reference level.
Claim 12
Dependent Claim
52 words
A control as defined in claim 7 wherein said means for producing an error signal comprises first and second means responsive to a back EMF produced by said first and second motors for producing first and second signals which vary as a function of the speed of said first and second reels.
Claim 13
Dependent Claim
40 words
Apparatus as defined in claim 7 further including means for producing a difference signal which is a function of the difference in the speeds of said first and second reels and applying said difference signal to modify said error signal.
Claim 14
Dependent Claim
69 words
Apparatus as defined in claim 12 wherein said means for producing said difference signal comprises means for producing a signal having an amplitude which is a function of the difference in speeds of the first and second reels, means for attenuating said signal and applying said signal to modify said error signal as a function of the attenuated amplitude in a sense opposite to that of said summed signal.
Claim 15
Independent Claim
77 words
A method for transferring material between first and second reels at a substantially constant linear velocity as the diameter of the spools of material stored on said reels varies as a non-linear function of the amount of material stored thereon that comprises driving said second reel with a first motor and supplying power to said first motor as a function of the difference between the sum of the speeds of the two reels and a reference level.
Claim 16
Independent Claim
77 words
A method for transferring material between first and second reels at a substantially constant linear velocity as the diameter of the spools of material stored on said reels varies as a non-linear function of the amount of material stored thereon that comprises driving said second reel with a first motor and supplying power to said first motor as a function of the difference between the sum of the speeds of the two reels and a reference level.
Claim 17
Dependent Claim
32 words
A method as defined in claim 14 further including the step of modifying said difference by an amount which is a function of the difference in the speeds of the two reels.
Claim 18
Dependent Claim
41 words
A method as defined in claim 14 further including the step of driving said first reel with a second motor and supplying power to the second motor at levels less than that at which power is supplied to the first motor.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |