Patent US4125801A successfully refreshed from Google Patents.
US4125801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Presettable number to step motor control system
Assignee: Dana Inc
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Filing: 1977-08-22
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Granted: 1978-11-14
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Expires: 1997-08-22
Abstract
Abstract A system for accepting a number and causing the same number of steps to be produced by a stepping motor with the motor essentially linearly accelerating to a settable maximum velocity and then linearly decelerating in small velocity changes to the end of the movement with the deceleration duration being inversely related to the maximum velocity.
Inventors
- 👤 Albert C. Leenhouts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:00
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/43; G05B2219/43006
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A system for accepting a number and causing a stepping motor to produce a movement having the same number of steps comprising a stepping motor means for producing a step essentially simultaneously with the receipt of a command pulse, variable rate oscillator means for producing command pulses, counter means for maintaining a count of the number of steps to be produced, means for directing the oscillator means to increase the rate of the command pulses at the beginning portion of the movement and means for directing the oscillator means to decrease the rate of the command pulses at the ending portion of the movement in accordance with essentially the square root of the count whereby the motor speed decreases essentially linearly.
Claim 2
Independent Claim
121 words
A system for accepting a number and causing a stepping motor to produce a movement having the same number of steps comprising a stepping motor means for producing a step essentially simultaneously with the receipt of a command pulse, variable rate oscillator means for producing command pulses, counter means for maintaining a count of the number of steps to be produced, means for directing the oscillator means to increase the rate of the command pulses at the beginning portion of the movement and means for directing the oscillator means to decrease the rate of the command pulses at the ending portion of the movement in accordance with essentially the square root of the count whereby the motor speed decreases essentially linearly.
Claim 3
Dependent Claim
57 words
The invention as defined in claim 1 in which the variable rate oscillator means produces a rate related to the value of an oscillator signal, in which the decreasing means includes means for providing a relative signal essentially representing each individual count in the decreasing movement and to which the value of the oscillator signal is related.
Claim 4
Dependent Claim
42 words
The invention as defined in claim 2 in which there are means for adjusting the relative ratio between the values of the relative signal and the oscillator signal and for maintaining the same ratio for all the steps in the decreasing movement.
Claim 5
Dependent Claim
65 words
The invention as defined in claim 2 in which the oscillator means produces command pulses at a maximum rate with a selected maximum value of oscillator signal and in which there are adjusting means for enabling substantially any one of the related signals to produce an oscillator signal having its selected maximum value whereby the number of steps in the decreasing movement may be altered.
Claim 6
Dependent Claim
25 words
The invention as defined in claim 2 in which the relative signal means is operable to produce relative signals for counts below a fixed count.
Claim 7
Dependent Claim
29 words
The invention as defined in claim 5 in which the ratio of the fixed count to the number of relative signals is on the order of ten to one.
Claim 8
Dependent Claim
28 words
The invention as defined in claim 2 in which the relative signal means provides the same relative signal for a wide range of counts for the higher counts.
Claim 9
Dependent Claim
28 words
The invention as defined in claim 2 in which the relative signal means provides the same relative signal for a narrow range of counts for the fewer counts.
Claim 10
Dependent Claim
29 words
The invention as defined in claim 2 in which the relative signal means includes a memory means programmed to provide a different binary representation for each different relative signal.
Claim 11
Dependent Claim
38 words
The invention as defined in claim 9 in which the relative signal means includes means for converting each different binary representation in a decreasing movement into a different analog voltage with said analog voltage constituting the relative signal.
Claim 12
Dependent Claim
22 words
The invention as defined in claim 10 in which the converting means includes adjustable means for adjusting the ratio of the conversion.
Claim 13
Dependent Claim
51 words
The invention as defined in claim 1 in which there are means for setting the maximum rate of the oscillator pulses and in which the means for decreasing the rate of the command pulses causes higher maximum rates to require a lesser duration for the ending portion than lower maximum rates.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |