Patent JPS504019A successfully refreshed from Google Patents.
US3649895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control system
Assignee: General Electric Co
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Filing: 1968-12-20
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Granted: 1972-03-14
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Expires: 1988-12-20
Abstract
Abstract A motor control system utilizing a phase control power amplifier with controlled rectifiers which include circuit means to vary the magnitude of the actuating signals to said power amplifier as a function of the magnitude of a back EMF signal from the motor to compensate for gain variations occuring in the phase control power amplifier. In order to linearize the relationship between motor current and input control signal applied to the motor control system for all conditions of motor EMF, a voltage amplifier having a gain which varies nonlinearly with said input control signal is placed between the source of these input signals and the power amplifier itself. The gain of this voltage amplifier is appropriately varied by an associated circuit network. A positive feedback signal proportional to the motor back EMF value is combined with the output signal from the variable gain amplifier.
Inventors
- 👤 John A Joslyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:15
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/918
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
In an improved motor control system drive motor means; power amplifier means including controlled rectifier means connected to an alternating-current source for applying electrical energy to said motor means; and compensating means for supplying actuating signals to said power amplifier responsive to control signals from a command source, said compensating means including a variable gain amplifier which varies nonlinearly with said control signals to continuously compensate for the nonlinear response to said power amplifier, the improvement comprising the provision of combining means responsive to said compensating means and to motor speed to modify said actuating signals flowing to said power amplifier as a function of the magnitude of the motor back EMF, said combining means adding to the said actuatIng signals from the variable gain amplifier a signal of like polarity representing the motor back EMF to form a modified actuating signal.
Claim 2
Dependent Claim
142 words
In an improved motor control system drive motor means; power amplifier means including controlled rectifier means connected to an alternating-current source for applying electrical energy to said motor means; and compensating means for supplying actuating signals to said power amplifier responsive to control signals from a command source, said compensating means including a variable gain amplifier which varies nonlinearly with said control signals to continuously compensate for the nonlinear response to said power amplifier, the improvement comprising the provision of combining means responsive to said compensating means and to motor speed to modify said actuating signals flowing to said power amplifier as a function of the magnitude of the motor back EMF, said combining means adding to the said actuatIng signals from the variable gain amplifier a signal of like polarity representing the motor back EMF to form a modified actuating signal.
Claim 3
Dependent Claim
138 words
The improved motor control system comprising the combination of drive motor means; power amplifier means including controlled rectifier means connected to an alternating-current source for applying electrical energy to said motor means; compensating means for supplying actuating signals to said power amplifier responsive to control signals from a command source, said compensating means including a variable gain amplifier which varies nonlinearly with said control signals to continuously compensate for the nonlinear response to said power amplifier; with the improvement constituting summing means between said compensating means and said power amplifier to modify said actuating signals en route to said power amplifier as a direct function of the magnitude of the motor back EMF wherein the actuating signals from the variable gain amplifier are combined with a positive feedback signal of like polarity representative of the back EMF value.
Claim 4
Dependent Claim
138 words
The improved motor control system comprising the combination of drive motor means; power amplifier means including controlled rectifier means connected to an alternating-current source for applying electrical energy to said motor means; compensating means for supplying actuating signals to said power amplifier responsive to control signals from a command source, said compensating means including a variable gain amplifier which varies nonlinearly with said control signals to continuously compensate for the nonlinear response to said power amplifier; with the improvement constituting summing means between said compensating means and said power amplifier to modify said actuating signals en route to said power amplifier as a direct function of the magnitude of the motor back EMF wherein the actuating signals from the variable gain amplifier are combined with a positive feedback signal of like polarity representative of the back EMF value.
Claim 5
Dependent Claim
187 words
In a motor control system, of the type having a direct current motor; a source of motor control signals; power amplifier means including controlled rectifier means responsive to said control signals for applying electrical energy from an alternating-current source to said motor; and compensating means interposed between said source and said power amplifier, said compensating means including a variable gain amplifier for modifying said control signals to compensate for the nonlinear response of said power amplifier; the improvement wherein said compensating means also includes a summing amplifier connected between the variable gain amplifier and the power amplifier, and further includes positive feedback signal generating means responsive to performance of said motor for producing a feedback signal of the same polarity as said control signals which is representative of the back EMF of said motor, said summing amplifier being responsive to and summing together the said control signals as modified by said variable gain amplifier and the said feedback signal representative of motor back EMF to produce control signals which are modified to compensate for both the nonlinearity of the power amplifier and back EMF of the motor.
Claim 6
Dependent Claim
187 words
In a motor control system, of the type having a direct current motor; a source of motor control signals; power amplifier means including controlled rectifier means responsive to said control signals for applying electrical energy from an alternating-current source to said motor; and compensating means interposed between said source and said power amplifier, said compensating means including a variable gain amplifier for modifying said control signals to compensate for the nonlinear response of said power amplifier; the improvement wherein said compensating means also includes a summing amplifier connected between the variable gain amplifier and the power amplifier, and further includes positive feedback signal generating means responsive to performance of said motor for producing a feedback signal of the same polarity as said control signals which is representative of the back EMF of said motor, said summing amplifier being responsive to and summing together the said control signals as modified by said variable gain amplifier and the said feedback signal representative of motor back EMF to produce control signals which are modified to compensate for both the nonlinearity of the power amplifier and back EMF of the 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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |