US3983466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor field control for d.c. drives
Assignee: AEG Westinghouse Industrial Automation Corp
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Filing: 1974-12-19
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Granted: 1976-09-28
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Expires: 1994-12-19
Abstract
Abstract A motor field control for d.c. drives, for regulating the speed in response to an input reference signal E in . A first operational amplifier is arranged as a ramp generator to receive the input command E in and deliver an output E 1 , having a maximum magnitude equal to E F . A potentiometer having a sliding contact is connected in the output of the first operational amplifier, the potential of the sliding contact with respect to ground defining an attenuation potential -αE 1 . The factor α is adjustable between O . . . n to include both fractional as well as whole numbered values. A second operational amplifier is arranged to sum three inputs: -E F , E in and -αE 1 and deliver an output E 2 for controlling the field flux beyond base speed. E.sub.2 = E.sub.F - E.sub.in +αE.sub.1 the simple selection of the magnitude for the attenuation factor α determines the crossover point between armature voltage control and field flux control for the d.c. motor.
Inventors
- 👤 Mohammed Safiuddin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:46
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
203 words
D.C. motor control circuitry for regulating the speed in response to an input command signal E in , by the control of motor armature voltage and field flux intensity respectively, comprising: a. means for receiving said command signal E in as an input, and for delivering a ramp signal E 1 having a maximum absolute magnitude equal to E F , for controlling the motor armature voltage up to base speed; b. means for potential attenuation, connected to the output of said motor armature voltage control means to receive said signal E 1 and for delivering a signal -α E 1 the factor α being adjustable between (0. . . n); c. means for summing three inputs: a first input connected to a source of potential - E F , a second input connected to receive said signal E in , and a third input connected to receive said attenuation signal - α E 1 , said summation means delivering an output E 2 for field flux control beyond base speed, where E 2 = E F - E in +αE 1 , whereby the selection of the factor α determines the cross-over point between motor armature voltage and field flux speed controls.
Claim 2
Dependent Claim
203 words
D.C. motor control circuitry for regulating the speed in response to an input command signal E in , by the control of motor armature voltage and field flux intensity respectively, comprising: a. means for receiving said command signal E in as an input, and for delivering a ramp signal E 1 having a maximum absolute magnitude equal to E F , for controlling the motor armature voltage up to base speed; b. means for potential attenuation, connected to the output of said motor armature voltage control means to receive said signal E 1 and for delivering a signal -α E 1 the factor α being adjustable between (0. . . n); c. means for summing three inputs: a first input connected to a source of potential - E F , a second input connected to receive said signal E in , and a third input connected to receive said attenuation signal - α E 1 , said summation means delivering an output E 2 for field flux control beyond base speed, where E 2 = E F - E in +αE 1 , whereby the selection of the factor α determines the cross-over point between motor armature voltage and field flux speed controls.
Claim 3
Dependent Claim
174 words
D.C. motor control circuitry for regulating the speed in response to an input command signal E in by the control of motor armature voltage and field flux intensity respectively, comprising: a. a first operational amplifier connected to receive E in as an input and deliver an output E 1 having a maximum magnitude equal to E F , for controlling the motor armature voltage up to base speed; b. a second operational amplifier having three inputs, a first input connected to a source of potential - E F , a second input connected to said command signal E in , said second operational amplifier delivering a signal E 2 for controlling the field flux beyond base speed; and c. means coupled between said first and said second operational amplifiers to provide an attenuated potential -α E 1 to the third input to said second operational amplifier, the factor α being adjustable (0 . . .n) whereby the selected magnitude for α determines the crossover point between armature voltage control and field flux speed control.
Claim 4
Dependent Claim
174 words
D.C. motor control circuitry for regulating the speed in response to an input command signal E in by the control of motor armature voltage and field flux intensity respectively, comprising: a. a first operational amplifier connected to receive E in as an input and deliver an output E 1 having a maximum magnitude equal to E F , for controlling the motor armature voltage up to base speed; b. a second operational amplifier having three inputs, a first input connected to a source of potential - E F , a second input connected to said command signal E in , said second operational amplifier delivering a signal E 2 for controlling the field flux beyond base speed; and c. means coupled between said first and said second operational amplifiers to provide an attenuated potential -α E 1 to the third input to said second operational amplifier, the factor α being adjustable (0 . . .n) whereby the selected magnitude for α determines the crossover point between armature voltage control and field flux speed control.
Claim 5
Dependent Claim
33 words
D.C. motor control circuitry according to claim 2 wherein said first operational amplifier is a ramp generator with said output E 1 varying linearly between zero and said fixed potential E F .
Claim 6
Dependent Claim
34 words
D.C. motor control circuitry according to claim 2 wherein said second operational amplifier is operated as a summation amplifier with the output being E 2 = E F -E in + αE 1 .
Claim 7
Dependent Claim
44 words
D.C. motor control circuitry according to claim 2 wherein said coupling means comprises a potentiometer connected across the output of said first operational amplifier and having a sliding contact, the position of said sliding contact with respect to ground, determining the magnitude of α.
Claim 8
Dependent Claim
48 words
D.C. motor control circuitry according to claim 2 wherein said first operational amplifier includes a feedback path which clamps the output at E F when E in ≧ E F whereby ##EQU4##for all E in ≦ E F E.sub.1 = -E.sub.F for all E in > E F
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |