US3793511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital motor control circuit
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1972-07-03
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Granted: 1974-02-19
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Expires: 1992-07-03
Abstract
Abstract A circuit for controlling the velocity and acceleration of a motor. The circuit includes a pulse source for producing pulses each of which represent an increment of velocity and for producing said pulses at a pulse rate proportional to the desired acceleration rate of said motor. The pulse rate controls the acceleration rate of the motor while, at the same time, the number of pulses are received by an up-down counter which stores a count proportional to the actual velocity of the motor. The counter counts the received pulses and either increases its count for acceleration or decreases its count for deceleration. The count within the counter is continuously compared with a count proportional to the desired velocity of the motor and when the counts are equal, indicating that the motor has reached its desired velocity, further acceleration is prevented. The circuit is particularly designed to enable complete binary control of machine tool systems and to permit the generation of a wide variety of curved shapes in cutting or profiling operations.
Inventors
- 👤 J Bala
- 👤 P Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:30
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B2219/00; G05B2219/30; G05B2219/43; G05B2219/43006; G05B2219/43183
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
202 words
A control system for controlling the the movement of an object comprising: a. an up-down counter for storing a first count proportional to the actual velocity of said object; b. means for storing a second count proportional to the desired velocity of said object; c. a pulse source for producing pulses each of which represent an increment of velocity and for producing said pulses at a pulse rate proportional to the desired acceleration of said object to reach said desired velocity; d. coupling means for coupling said pulse source to said up-down counter for changing said first count by an amount proportional to the number of pulses received from said pulse source, said coupling means including means for causing said up-down counter to increase its count when said first count is less than said second count and to decrease its count when said first count is greaTer than said second count; e. means for positively accelerating said object when said counter increases its count and for negatively accelerating said object when said counter decreases its count; f. means for comparing said first count with said second count; and g. means for disabling said accelerating means when said counts are in desired correspondence.
Claim 2
Dependent Claim
202 words
A control system for controlling the the movement of an object comprising: a. an up-down counter for storing a first count proportional to the actual velocity of said object; b. means for storing a second count proportional to the desired velocity of said object; c. a pulse source for producing pulses each of which represent an increment of velocity and for producing said pulses at a pulse rate proportional to the desired acceleration of said object to reach said desired velocity; d. coupling means for coupling said pulse source to said up-down counter for changing said first count by an amount proportional to the number of pulses received from said pulse source, said coupling means including means for causing said up-down counter to increase its count when said first count is less than said second count and to decrease its count when said first count is greaTer than said second count; e. means for positively accelerating said object when said counter increases its count and for negatively accelerating said object when said counter decreases its count; f. means for comparing said first count with said second count; and g. means for disabling said accelerating means when said counts are in desired correspondence.
Claim 3
Dependent Claim
41 words
A control system as recited in claim 1 wherein said disabling means comprises switch means and wherein said comparing means includes means for producing a signal to close said switch means when said first and second counts are in desired correspondence.
Claim 4
Dependent Claim
55 words
A control system as recited in claim 1 wherein said up-down counter changes its count at a rate proportional to the pulse rate of said pulse source and wherein said accelerating means includes means coupled to said up-down counter for accelerating said object by an amount proportional to the rate of change of said count.
Claim 5
Dependent Claim
30 words
A control system as recited in claim 1 and further including means for selectively changing the pulse rate of said pulse source for selectively changing the acceleration of said object.
Claim 6
Dependent Claim
44 words
A control system as recited in claim 4 wherein said pulse source comprises an oscillator and wherein said means for selectively changing the pulse rate of said pulse source comprises means for producing a signal proportional to the desired pulse rate of said oscillator.
Claim 7
Dependent Claim
54 words
A control system as recited in claim 5 and further including storage means for storing digital data representing the desired acceleration of said object and wherein said pulse rate changing means includes a digital to analog converter for converting said digital data into an analog signal proportional to the desired acceleration of said object.
Claim 8
Dependent Claim
70 words
A control system as recited in claim 6 wherein said up-down counter includes output means for producing a digital output signal proportional to the count in said up-down counter and wherein said second count storage means includes means for storing digital data representing the desired velocity of said object and wherein said comparing means comprises a digital comparator for comparing the digital output of said counter with said second count.
Claim 9
Dependent Claim
220 words
A control system for controlling the movement of an object comprising: a. an up-down counter for storing a first count proportional to the actual velocity of said object; b. means for storing a second count proportional to the desired velocity of said object; c. a pulse source for producing pulses each of which represent an increment of velocity and for producing said pulses at a pulse rate proportional to the desired acceleration of said object to reach said desired velocity; d. coupling means for coupling said pulse source to said up-down counter for changing said first count an amount proportional to the number of pulses received from said pulse source and for changing said first count at a rate proportional to the pulse rate of said pulse source, said coupling means including means for causing said up-down counter to increase its count when said first count is less than said second count and to decrease its count when said first count is greater than said second count; e. means coupled to said counter means for accelerating said object by an amount proportional to the rate of change of said first count; f. means for comparing said first count with said second count; and g. means for disabling said accelerating means when said first and second counts are in desired correspondence.
Claim 10
Dependent Claim
220 words
A control system for controlling the movement of an object comprising: a. an up-down counter for storing a first count proportional to the actual velocity of said object; b. means for storing a second count proportional to the desired velocity of said object; c. a pulse source for producing pulses each of which represent an increment of velocity and for producing said pulses at a pulse rate proportional to the desired acceleration of said object to reach said desired velocity; d. coupling means for coupling said pulse source to said up-down counter for changing said first count an amount proportional to the number of pulses received from said pulse source and for changing said first count at a rate proportional to the pulse rate of said pulse source, said coupling means including means for causing said up-down counter to increase its count when said first count is less than said second count and to decrease its count when said first count is greater than said second count; e. means coupled to said counter means for accelerating said object by an amount proportional to the rate of change of said first count; f. means for comparing said first count with said second count; and g. means for disabling said accelerating means when said first and second counts are in desired correspondence.
Claim 11
Dependent Claim
55 words
A control system as recited in claim 8 wherein said disabling means comprises switch means coupled between said pulse source and said up-down counter and wherein said comparing means includes means for producing a signal to close said switch means when said counts are in desired correspondence to prevent further changing of said first count.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |