Patent US3787727A successfully refreshed from Google Patents.
US3787727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepper motor control
Assignee: International Business Machines Corp
•
Filing: 1972-12-27
•
Granted: 1974-01-22
•
Expires: 1992-12-27
Abstract
Abstract A half-step stepper motor control circuit in which the acceleration period is constant independent of whether the advance instruction occurs, (1) when the motor starts from 1 phase energization, or (2) when the motor starts from 2 phase energization, and the deceleration period is constant and independent of whether (1) the motor stops in 1 phase energization or (2) the motor stops in 2 phase energization.
Inventors
- 👤 R Mcsparran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:59
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
245 words
A half-step control system for a stepper motor having stator poles with windings and a rotor, said stator poles and said rotor each having a plurality of teeth, said control system comprising; a. a start-stop control circuit responsive to a signal representative of an instruction to move a predetermined number of half-steps for producing a start signal and responsive to an initiate stop signal for producing (1) a stop 1 phase signal if the motor is to have only one of its subwindings to be energized at the completion of the instruction to move, and (2) a stop 2 phase signal if the motor is to have two of its subwindings to be energized at the completion of the instruction to move, b. a feedback control responsive to said start signal and to said instruction to move signal for producing feedback step signals equal in number to the number of steps represented by the movE instruction signal minus n where n is a selected positive integer and for producing said initiate stop signal, c. a first stop sequencer responsive to said stop 1 phase signal for producing a series of stop signals equal in number to said selected n, d. a second stop sequencer pulse generator responsive to said stop 2 phase signal for producing said selected n number of stop signals, and e. means responsive to said start signal, said feedback step signals, and said stop signals for energizing said windings in half-step sequence.
Claim 2
Dependent Claim
245 words
A half-step control system for a stepper motor having stator poles with windings and a rotor, said stator poles and said rotor each having a plurality of teeth, said control system comprising; a. a start-stop control circuit responsive to a signal representative of an instruction to move a predetermined number of half-steps for producing a start signal and responsive to an initiate stop signal for producing (1) a stop 1 phase signal if the motor is to have only one of its subwindings to be energized at the completion of the instruction to move, and (2) a stop 2 phase signal if the motor is to have two of its subwindings to be energized at the completion of the instruction to move, b. a feedback control responsive to said start signal and to said instruction to move signal for producing feedback step signals equal in number to the number of steps represented by the movE instruction signal minus n where n is a selected positive integer and for producing said initiate stop signal, c. a first stop sequencer responsive to said stop 1 phase signal for producing a series of stop signals equal in number to said selected n, d. a second stop sequencer pulse generator responsive to said stop 2 phase signal for producing said selected n number of stop signals, and e. means responsive to said start signal, said feedback step signals, and said stop signals for energizing said windings in half-step sequence.
Claim 3
Dependent Claim
78 words
A half-step control system according to claim 1, further including; a. a first pedestal circuit responsive to said stop 1 phase signal for controlling the current in said subwindings for a first predetermined time period, and b. a second pedestal circuit responsive to said stop 2 phase signal for controlling the current in said windings for a second predetermined time period, whereby the deceleration period is constant whether the motor stops with one phase or two phases energized.
Claim 4
Dependent Claim
128 words
A half-step control system according to claim 1, wherein said start-stop control circuit further includes means responsive to said move signal to produce a start 1 phase signal when only one winding is energized when the move signal is received and to produce a start 2 phase signal when two windings are energized when the move signal is received and further including; a. a first pedestal circuit responsive to said start 1 phase signal for controlling the current in subwindings for a first predetermined time period, and b. a second pedestal circuit responsive to said start 2 phase signal for controlling the current in subwindings for a second predetermined time period, whereby the deceleration period is constant whether the motor starts with one phase or two phases energized.
Claim 5
Dependent Claim
159 words
A half-step control system for a stepper motor having stator poles with windings and a rotor, said stator poles and said rotor each having a plurality of teeth, said control system comprising; a. a start-stop control circuit responsive to a signal representative of an instruction to move a predetermined number of half-steps for producing a (1) start 1 phase signal if only one of said windings is energized when the move signal is received, and (2) start 2 phase signal if two of said windings are energized when the move signal is received, b. a first pedestal circuit responsive to said start 1 phase signal for controlling the current in subwindings for a first predetermined time period, and c. a second pedestal circuit responsive to said start 2 phase signal for controlling the current in subwindings for a second predetermined time period, whereby the deceleration period is constant whether the motor starts with one phase or two phases energized.
Claim 6
Dependent Claim
159 words
A half-step control system for a stepper motor having stator poles with windings and a rotor, said stator poles and said rotor each having a plurality of teeth, said control system comprising; a. a start-stop control circuit responsive to a signal representative of an instruction to move a predetermined number of half-steps for producing a (1) start 1 phase signal if only one of said windings is energized when the move signal is received, and (2) start 2 phase signal if two of said windings are energized when the move signal is received, b. a first pedestal circuit responsive to said start 1 phase signal for controlling the current in subwindings for a first predetermined time period, and c. a second pedestal circuit responsive to said start 2 phase signal for controlling the current in subwindings for a second predetermined time period, whereby the deceleration period is constant whether the motor starts with one phase or two phases energized.
Claim 7
Dependent Claim
189 words
A half-step control system for a stepper motor having stator poles with windings and a rotor, said stator poles and said rotor each having a plurality of teeth, said control system comprising; a. a start-stop control circuit responsive to a signal representative of an instruction to move a predetermined number of half-steps for producing a start signal and responsive to an initiate stop signal for producing (1) a stop 1 phase signal if the motor is to have only one of its subwindings to be energized at the completion of the instruction to move, and (2) a stop 2 phase signal if the motor is to have two of its subwindings to be energized at the completion of the instruction to move, b. a first pedestal circuit responsive to said stop 1 phase signal for controlling the current in said subwindings for a first predetermined time period, and c. a second pedestal circuit responsive to said stop 2 phase signal for controlling the current in subwindings for a second predetermined time period, whereby the deceleration period is constant whether the motor stops with one phase or two phases energized.
Claim 8
Dependent Claim
189 words
A half-step control system for a stepper motor having stator poles with windings and a rotor, said stator poles and said rotor each having a plurality of teeth, said control system comprising; a. a start-stop control circuit responsive to a signal representative of an instruction to move a predetermined number of half-steps for producing a start signal and responsive to an initiate stop signal for producing (1) a stop 1 phase signal if the motor is to have only one of its subwindings to be energized at the completion of the instruction to move, and (2) a stop 2 phase signal if the motor is to have two of its subwindings to be energized at the completion of the instruction to move, b. a first pedestal circuit responsive to said stop 1 phase signal for controlling the current in said subwindings for a first predetermined time period, and c. a second pedestal circuit responsive to said stop 2 phase signal for controlling the current in subwindings for a second predetermined time period, whereby the deceleration period is constant whether the motor stops with one phase or two phases energized.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |