Patent US3636424A successfully refreshed from Google Patents.
US3636424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor drive system with acceleration-deceleration control
Assignee: New Britain Machine Co
•
Filing: 1969-06-23
•
Granted: 1972-01-18
•
Expires: 1989-06-23
Abstract
Abstract A drive system utilizes silicon-controlled rectifiers and a feedback loop for operating a direct current motor from alternating current input power at a predetermined speed regardless of load conditions. Circuitry is provided for controlling the width of the dead band of the system, and a circuit is provided for controlling acceleration and deceleration of the motor, said circuit having a capacitor and switch means responsive to an error signal to charge and discharge said capacitor.
Inventors
- 👤 John F Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:22
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
In a speed control system for DC motors having rectifiers for regulating the power applied to the motor according to the difference signal between reference and motor feedback signals, modifying means for limiting the accelerations and deceleration of said motor, and adjustable dead band control means for rendering the system insensitive to difference signals less than a preset amplitude, said modifying means comprises a capacitor means and switch means responsive to said difference signal for charging and discharging said capacitor.
Claim 2
Dependent Claim
80 words
In a speed control system for DC motors having rectifiers for regulating the power applied to the motor according to the difference signal between reference and motor feedback signals, modifying means for limiting the accelerations and deceleration of said motor, and adjustable dead band control means for rendering the system insensitive to difference signals less than a preset amplitude, said modifying means comprises a capacitor means and switch means responsive to said difference signal for charging and discharging said capacitor.
Claim 3
Dependent Claim
12 words
The system of claim 1, wherein said switch means comprise transistor means.
Claim 4
Dependent Claim
25 words
The system of claim 2, wherein said transistor means include a PNP-transistor for charging said capacitor means and an NPN-transistor for discharging said capacitor means.
Claim 5
Dependent Claim
32 words
The system of claim 3, wherein said difference signal provides emitter voltage to said transistors, and said capacitor means comprises a capacitor that is common to base-emitter circuits of both said transistors.
Claim 6
Dependent Claim
94 words
In a speed control system for DC motors having electronically controlled rectifiers for automatically regulating the power applied to the motor according to the difference signal between reference and motor feedback signals, the improvement comprising electronic modifying means for limiting the acceleration and deceleration of said motor, said modifying means including an electronic time delay circuit and switch means for limiting any change in said difference signal to less than a predetermined rate, said modifying means comprises capacitor means and said switch means responsive to said difference signal for charging and discharging said capacitor.
Claim 7
Dependent Claim
94 words
In a speed control system for DC motors having electronically controlled rectifiers for automatically regulating the power applied to the motor according to the difference signal between reference and motor feedback signals, the improvement comprising electronic modifying means for limiting the acceleration and deceleration of said motor, said modifying means including an electronic time delay circuit and switch means for limiting any change in said difference signal to less than a predetermined rate, said modifying means comprises capacitor means and said switch means responsive to said difference signal for charging and discharging said capacitor.
Claim 8
Dependent Claim
12 words
The system of claim 5, wherein said switch means comprise transistor means.
Claim 9
Dependent Claim
25 words
The system of claim 6, wherein said transistor means include a PNP-transistor for charging said capacitor means and an NPN-transistor for discharging said capacitor means.
Claim 10
Dependent Claim
33 words
The system of claim 7, wherein said difference signal provides emitter voltage to said transistors, and said capacitor means comprises a capacitor that is common to base-emitter circuits of both a said transistors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |