US3636429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic circuitry for providing stopping control for stepping motors
Assignee: International Business Machines Corp
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Filing: 1970-05-08
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Granted: 1972-01-18
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Expires: 1990-05-08
Abstract
Abstract The invention is concerned with circuitry for providing a sequence of stopping pulses derived from motor feedback pulses. It includes means for providing an initial stop pulse which reverses the phase of the motor to thereby develop a negative torque. Intermediate stopping pulses in the form of feedback pulses continue to apply the negative torque to the rotor. A final stopping pulse not derived from the feedback pulses is applied to bring the motor to its equilibrium position. In this manner, a stepping motor can be stopped with substantially no oscillations after a specified number of steps.
Inventors
- 👤 Marek Jakubowski
- 👤 Joseph P Pawletko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:57
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
217 words
In a system for controlling the movement of a stepping motor comprising drive pulse responsive means for driving the motor through a series of discrete steps, said drive pulse responsive means including a plurality of coils the selective energization thereof causing the motor rotor to rotate through a Series of steps and switch means causing energization of said coils in a first or second sequence to control the direction of rotor rotation, the improvement comprising: a. means for generating a single train of feedback pulses from an operating stepping motor, b. gate means for selectively applying said feedback pulses as drive pulses to said drive pulse responsive means, c. counter means, for storing an indication of the number of drive pulses applied to said drive pulse responsive means, d. first pulse producing means, responsive to a predetermined count in said counter means, for simultaneously causing the generation of a drive pulse and a reversal of the coil energization sequence for a predetermined time interval to thereby cause the coil energization sequence to assume its prereversal state before the generation of the next succeeding drive pulse, and e. second pulse producing means, responsive to a predetermined number of drive pulses for generating a drive pulse at a predetermined time to bring said rotor to a substantially nonoscillating stop.
Claim 2
Dependent Claim
217 words
In a system for controlling the movement of a stepping motor comprising drive pulse responsive means for driving the motor through a series of discrete steps, said drive pulse responsive means including a plurality of coils the selective energization thereof causing the motor rotor to rotate through a Series of steps and switch means causing energization of said coils in a first or second sequence to control the direction of rotor rotation, the improvement comprising: a. means for generating a single train of feedback pulses from an operating stepping motor, b. gate means for selectively applying said feedback pulses as drive pulses to said drive pulse responsive means, c. counter means, for storing an indication of the number of drive pulses applied to said drive pulse responsive means, d. first pulse producing means, responsive to a predetermined count in said counter means, for simultaneously causing the generation of a drive pulse and a reversal of the coil energization sequence for a predetermined time interval to thereby cause the coil energization sequence to assume its prereversal state before the generation of the next succeeding drive pulse, and e. second pulse producing means, responsive to a predetermined number of drive pulses for generating a drive pulse at a predetermined time to bring said rotor to a substantially nonoscillating stop.
Claim 3
Dependent Claim
61 words
The system of claim 1 wherein said first pulse producing means includes means for disabling said gate means for a time sufficient to block succeeding feedback pulses from said drive pulse responsive means while simultaneously causing reversal of the coil energization sequence and means for generating a drive pulse independent of the feedback pulses concurrently with the coil energization sequence reversal.
Claim 4
Dependent Claim
25 words
The system of claim 2 further including delay means responsive to said predetermined number of drive pulses for causing the blocking of said gate means.
Claim 5
Dependent Claim
90 words
The system of claim 1 further including, latch means for indicating the operating state of said system, means for causing the latch means to switch to a state indicating deenergization of said motor in response to a predetermined count in said counter, said first pulse producing means including means responsive to the switching of said latch means for causing reversal of the coil energization sequence on the occurrence of the next succeeding feedback pulse to thereby simultaneously cause the generation of a drive pulse and a coil energization sequence reversal.
Claim 6
Dependent Claim
136 words
The system of claim 4 further including a motor direction signal source for controlling the coil energization sequence, said means for causing coil energization reversal concurrently with the next feedback pulse comprising; a. first single shot pulse generator responsive to the switching of the latch means, b. AND gate means, the inputs thereof receiving said feedback pulses and the output from said first single shot pulse generator, c. second single shot pulse generator coupled to the output of said AND gate means for generating an output pulse of a predetermined length in response to coincidence between a feedback pulse and an output from said first single shot and d. logic means, responsive to an output from said second single shot for reversing the coil energization sequence for the duration of the second single shot generated pulse.
Claim 7
Dependent Claim
64 words
The system of claim 5 wherein said logic means includes, a. second AND gate means and OR gate means the inputs thereof receiving the outputs from said direction signal source and said second single shot, b. inverter means coupled to the output of said OR gate means and AND gate means and inverter means, said terminal means being further connected to said switch means.
Claim 8
Dependent Claim
58 words
The system of claim 4 wherein said gate means for selectively applying feedback pulses as drive pulses comprises; a. a coincidence gate, b. a hold over single shot pulse generator and c. a NOR gate, the inputs thereof coupled to said latch means and said hold over single shot, the output thereof being coupled to said coincidence gate.
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 |