US3812414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepper motor control system using pulse injection for velocity overshoot control
Assignee: International Business Machines Corp
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Filing: 1972-11-24
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Granted: 1974-05-21
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Expires: 1992-11-24
Abstract
Abstract Starting control of a stepper motor having an open-loop oscillator control is obtained by utilizing a pulse injection arrangement whereby a plurality of pulses are supplied in rapid succession at the proper time to the drive circuits for the stepper motor giving a negative torque to the motor which prevents an overshoot in velocity.
Inventors
- 👤 D Abraham
- 👤 R Mcsparran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A stepper motor control system of the open-loop type comprising, in combination: driver circuit means for a stepper motor; drive triggers for supplying sequences of motor control output pulses for energizing said driver circuit means; signal means for supplying a pulse to said drive triggers to start said stepper motor; an oscillator started by said signal means for supplying pulses to said drive triggers to drive said stepper motor; and pulse injection means rendered operative by said signal means when said stepper motor iS started for supplying a series of pulses to advance said drive triggers whereby a negative torque is applied to the stepper motor to prevent an overshoot in velocity during starting of said motor within the step to step region.
Claim 2
Dependent Claim
123 words
A stepper motor control system of the open-loop type comprising, in combination: driver circuit means for a stepper motor; drive triggers for supplying sequences of motor control output pulses for energizing said driver circuit means; signal means for supplying a pulse to said drive triggers to start said stepper motor; an oscillator started by said signal means for supplying pulses to said drive triggers to drive said stepper motor; and pulse injection means rendered operative by said signal means when said stepper motor iS started for supplying a series of pulses to advance said drive triggers whereby a negative torque is applied to the stepper motor to prevent an overshoot in velocity during starting of said motor within the step to step region.
Claim 3
Dependent Claim
126 words
A stepper motor control system of the open-loop type comprising, in combination: driver circuit means for a stepper motor; driver triggers for supplying sequences of motor control output pulses for energizing said driver circuit means; signal means for supplying a pulse to said drive triggers to start said stepper motor; an oscillator started by said signal means for supplying pulses to said drive triggers to drive said stepper motor; and a series of interconnecteed single-shot devices rendered operative by said signal means when said stepper motor is started for supplying a series of pulses to advance said drive triggers whereby a negative torque is applied to the stepper motor to prevent an overshoot in velocity during starting of said motor within the step to step region.
Claim 4
Dependent Claim
126 words
A stepper motor control system of the open-loop type comprising, in combination: driver circuit means for a stepper motor; driver triggers for supplying sequences of motor control output pulses for energizing said driver circuit means; signal means for supplying a pulse to said drive triggers to start said stepper motor; an oscillator started by said signal means for supplying pulses to said drive triggers to drive said stepper motor; and a series of interconnecteed single-shot devices rendered operative by said signal means when said stepper motor is started for supplying a series of pulses to advance said drive triggers whereby a negative torque is applied to the stepper motor to prevent an overshoot in velocity during starting of said motor within the step to step region.
Claim 5
Dependent Claim
140 words
A stepper motor control system of the open-loop type comprising, in combination: driver circuit means for a stepper motor; drive triggers for supplying sequences of motor control output pulses for energizing said driver circuit means; signal means for supplying a pulse to said drive triggers to start said stepper motor; an oscillator started by said signal means for supplying pulses to said drive triggers to drive said stepper motor; and a series of interconnected singleshot devices rendered operative by said signal means when said stepper motor is started for supplying a series of pulses having a short interval therebetween which will cause the drive triggers to advance but will be too short for the stepper motor to respond to each individual pulse whereby an overshoot in velocity is prevented during starting of said motor within the step to step region.
Claim 6
Dependent Claim
140 words
A stepper motor control system of the open-loop type comprising, in combination: driver circuit means for a stepper motor; drive triggers for supplying sequences of motor control output pulses for energizing said driver circuit means; signal means for supplying a pulse to said drive triggers to start said stepper motor; an oscillator started by said signal means for supplying pulses to said drive triggers to drive said stepper motor; and a series of interconnected singleshot devices rendered operative by said signal means when said stepper motor is started for supplying a series of pulses having a short interval therebetween which will cause the drive triggers to advance but will be too short for the stepper motor to respond to each individual pulse whereby an overshoot in velocity is prevented during starting of said motor within the step to step region.
Claim 7
Dependent Claim
32 words
A stepper motor control system as in claim 1 wherein said series of pulses from the pulse injection means occur at a substantially higher frequency than the frequency of said oscillator pulses.
Claim 8
Dependent Claim
28 words
A stepper motor control system as in claim 3 wherein said series of pulses comprises three pulses having an interval therebetween in the range of a few microseconds.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |