US4234830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepping motor control circuit
Assignee: Allen Bradley Co LLC
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Filing: 1978-01-25
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Granted: 1980-11-18
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Expires: 1998-01-25
Abstract
Abstract Disclosed is a stepping motor control utilizing a microprocessor. The control is suitable for driving one or more stepping motors one at a time or in unison. In the illustrated embodiment when plural motors are driven together they are driven at the same rate or at rates in a fixed proportion to one another although several of the features of the invention are suitable for use in circuits providing contouring control; i.e., where separate motors are driven at separate stepping rates proportional to the relative distances each is to traverse for a single movement. An acceleration/deceleration circuit is utilized which provides simple yet highly accurate and efficient control of the stepping motors. Feed rate compensation for simultaneous drive of two motors is provided. Also a means is provided to allow stepping rates in excess of the counting rate capability of the microprocessor.
Inventors
- 👤 Lee E. Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:42
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/34; G05B2219/34087; G05B2219/34215; G05B2219/43; G05B2219/43006; G05B2219/43139; G05B2219/43158
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
In a numerical controller for controlling the movement of a part of the action of two stepping motors moving in response to pulses, a control circuit comprising: (a) oscillator means providing pulses at a rate proportional to the rate of desired movement of the part; (b) drive means controlled by pulses from said oscillator means to drive said stepping motors both simultaneously and individually at a rate proportional to the rate it receives pulses; (c) means to determine when said stepping motors are to be driven simultaneously; (d) means for blocking pulses to one of said stepper motors when it is determined that both will not be driven simultaneously; and (e) means interposed between said oscillator means and said drive means to reduce the rate of control pulses to said stepping motors by a factor of approximately 1.4 when both of said stepping motors are being driven simultaneously as compared to when they are driven individually.
Claim 2
Dependent Claim
156 words
In a numerical controller for controlling the movement of a part of the action of two stepping motors moving in response to pulses, a control circuit comprising: (a) oscillator means providing pulses at a rate proportional to the rate of desired movement of the part; (b) drive means controlled by pulses from said oscillator means to drive said stepping motors both simultaneously and individually at a rate proportional to the rate it receives pulses; (c) means to determine when said stepping motors are to be driven simultaneously; (d) means for blocking pulses to one of said stepper motors when it is determined that both will not be driven simultaneously; and (e) means interposed between said oscillator means and said drive means to reduce the rate of control pulses to said stepping motors by a factor of approximately 1.4 when both of said stepping motors are being driven simultaneously as compared to when they are driven individually.
Claim 3
Dependent Claim
25 words
The control of claim 1 wherein said means to reduce the rate of control pulses is selectively operable for each increment of stepping motor drive.
Claim 4
Dependent Claim
157 words
In a numerical controller for controlling the movement of a part of the action of two stepping motors moving in response to pulses, a control circuit comprising: (a) oscillator means providing pulses at a rate proportional to the rate of desired movement of the part; (b) drive means controlled by pulses from said oscillator means to drive said stepping motors both simultaneously and individually at a rate proportional to the rate it receives pulses; (c) means to determine when said stepping motors are to be driven simultaneously; (d) means for selecting one of said stepper motors for receiving pulses when it is determined that both will not be driven simultaneously; and (e) means interposed between said oscillator means and said drive means to reduce the rate of control pulses to said stepping motors by a factor of approximately 1.4 when both of said stepping motors are being driven simultaneously as compared to when they are driven individually.
Claim 5
Dependent Claim
157 words
In a numerical controller for controlling the movement of a part of the action of two stepping motors moving in response to pulses, a control circuit comprising: (a) oscillator means providing pulses at a rate proportional to the rate of desired movement of the part; (b) drive means controlled by pulses from said oscillator means to drive said stepping motors both simultaneously and individually at a rate proportional to the rate it receives pulses; (c) means to determine when said stepping motors are to be driven simultaneously; (d) means for selecting one of said stepper motors for receiving pulses when it is determined that both will not be driven simultaneously; and (e) means interposed between said oscillator means and said drive means to reduce the rate of control pulses to said stepping motors by a factor of approximately 1.4 when both of said stepping motors are being driven simultaneously as compared to when they are driven individually.
Claim 6
Dependent Claim
25 words
The control of claim 3 wherein said means to reduce the rate of control pulses is selectively operable for each increment of stepping motor drive.
References Cited (Backward Citations)
US3576981A
Cited
US3878372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |