US3694725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepping motor control system using pulse injection
Assignee: International Business Machines Corp
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Filing: 1969-12-29
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Granted: 1972-09-26
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Expires: 1989-12-29
Abstract
Abstract Single step operation of a stepping motor and deceleration of the stepping motor utilized in a closed-loop mode are obtained utilizing a pulse injection arrangement in which a suitable plurality of pulses are supplied in rapid succession to the drive circuits for the stepping motor in order to quickly step the magnetic fields to the proper condition at a rate too fast for the rotor to follow.
Inventors
- 👤 Dennis G Abraham
- 👤 Joseph P Pawletko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:24
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A stepping motor control system comprising, in combination, a. bi-directional counter means responsive to serially-supplied input pulses on a pulse input line for providing motor control output pulses in predetermined sequence for sequentially energizing the driver circuits for a stepping motor, b. first control means connected to the pulse input line of said counter means for governing the operation of said counter means for supplying motor control output pulses at a first normal running frequency, comprising feedback means governed by the operation of said stepping motor for supplying pulses at said first normal running frequency to the pulse input line of said bi-directional counter, and c. deceleration control means connected to said counter means and effective at times to govern the operation of said counter means to supply a plurality of motor control output pulses at a second frequency substantially higher than said first frequency, said plurality of second frequency pulses occurring at a rate and number such that said counter means advances the driver circuits at a rate greater than the mechanical response time of the stepping motor, to energize said motor in a deceleration mode.
Claim 2
Dependent Claim
187 words
A stepping motor control system comprising, in combination, a. bi-directional counter means responsive to serially-supplied input pulses on a pulse input line for providing motor control output pulses in predetermined sequence for sequentially energizing the driver circuits for a stepping motor, b. first control means connected to the pulse input line of said counter means for governing the operation of said counter means for supplying motor control output pulses at a first normal running frequency, comprising feedback means governed by the operation of said stepping motor for supplying pulses at said first normal running frequency to the pulse input line of said bi-directional counter, and c. deceleration control means connected to said counter means and effective at times to govern the operation of said counter means to supply a plurality of motor control output pulses at a second frequency substantially higher than said first frequency, said plurality of second frequency pulses occurring at a rate and number such that said counter means advances the driver circuits at a rate greater than the mechanical response time of the stepping motor, to energize said motor in a deceleration mode.
Claim 3
Dependent Claim
32 words
A stepping motor control system as claimed in claim 1, further including timing means connected to said feedback means effective to govern the time during which said signal generator means is effective.
Claim 4
Dependent Claim
42 words
A stepping motor control system as claimed in claim 1, further including means governed by said first control means for initiating the operation of said stepping motor and maintaining the operation of said motor by feedback signals supplied from said feedback means.
Claim 5
Dependent Claim
41 words
A stepping motor control system as claimed in claim 3, further including timing means connected to said feedback control means for disabling the control of said counter by said feedback means when the time between feedback pulses exceeds a predetermined amount.
Claim 6
Dependent Claim
35 words
A stepping motor control system as claimed in claim 3, in which said timing means is effective to control said feedback means only when said first control means is ineffective to control said counter means.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |