US3899729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maximum speed control circuit for a stepping motor
Assignee: Superior Electric Co
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Filing: 1974-01-16
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Granted: 1975-08-12
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Expires: 1994-01-16
Abstract
Abstract A circuit for supplying pulses to a motor control for a stepping motor with the motor producing an incremental step for each pulse essentially at the frequency of the pulses supplied with the pulses being obtained from a fixed rate oscillator set at about the maximum tolerable rate of the system and with an adjustable delay setting the maximum tolerable pulse rate for each individual application or applications.
Inventors
- 👤 Arthur Richard Emery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
A speed control circuit having an input, said motor control means including a variable rate oscillator means for setting the rate at which the changes of energization occur and having a maximum rate, said speed control circuit including a fixed rate oscillator and an adjustable delay means, means setting said fixed rate oscillator to produce pulses at a fixed rate no greater than the maximum rate of the variable rate oscillator means and means interconnecting the adjustable delay means to the fixed rate oscillator to regulate a lesser rate of the pulses produced by the fixed rate oscillator than that to which it is set whereby said motor is prevented from normally stepping at a rate greater than the maximum rate seT by the pulses from the speed control circuit.
Claim 2
Dependent Claim
130 words
A speed control circuit having an input, said motor control means including a variable rate oscillator means for setting the rate at which the changes of energization occur and having a maximum rate, said speed control circuit including a fixed rate oscillator and an adjustable delay means, means setting said fixed rate oscillator to produce pulses at a fixed rate no greater than the maximum rate of the variable rate oscillator means and means interconnecting the adjustable delay means to the fixed rate oscillator to regulate a lesser rate of the pulses produced by the fixed rate oscillator than that to which it is set whereby said motor is prevented from normally stepping at a rate greater than the maximum rate seT by the pulses from the speed control circuit.
Claim 3
Dependent Claim
38 words
The invention as defined in claim 1 in which there are means for inhibiting the adjustable delay means to enable pulses to be supplied to the motor control means at a rate equal to the fixed oscillator rate.
Claim 4
Dependent Claim
32 words
The invention as defined in claim 1 in which there is one output pulse from the means for supplying pulses for each change of energization produced by the variable rate oscillator means.
Claim 5
Dependent Claim
77 words
The invention as defined in claim 1 in which there is a second motor control means having a variable rate oscillator means and in which the speed control circuit includes a second fixed rate oscillator for supplying pulses to the second motor control means, means setting said second fixed rate oscillator to have a fixed rate of its pulses no greater than the maximum rate of the variable rate oscillator means of the second motor control means.
Claim 6
Dependent Claim
41 words
The invention as defined in claim 4 in which the adjustable delay means is connected to the second fixed rate oscillator and in which said adjustable delay means controls the lesser rate at which the second fixed rate oscillator produces pulses.
Claim 7
Dependent Claim
33 words
The invention as defined in claim 5 in which the adjustable delay means controls both fixed rate oscillators to have them produce pulses at the same rate set by the adjustable delay means.
Claim 8
Dependent Claim
68 words
The invention as defined in claim 5 in which there is means for preventing the adjustable delay means from controlling the pulse rate of the two fixed rate oscillators, in which the pulse rates of the fixed oscillators are different and in which the speed control circuit includes means for setting the pulse rate from both oscillators to that of the fixed rate oscillator having the lower rate.
Claim 9
Dependent Claim
65 words
The invention as defined in claim 7 in which each fixed rate oscillator is responsive to produce pulses only with the receipt of a command signal and in which the speed control circuit includes means for enabling the one fixed rate oscillator having a command signal to supply pulses at its fixed rate when there is no command signal to the other fixed rate oscillator.
References Cited (Backward Citations)
US3411058A
Cited
US3424961A
Cited
US3579279A
Cited
US3553549A
Cited
US3593097A
Cited
US3582752A
Cited
US3742329A
Cited
US3767990A
Cited
US3806821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |