US3605000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Numerical control including a variable gain loop controlling a pilot stepping motor controlling an electrohydraulic positioning motor
Assignee: Fujitsu Ltd
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Filing: 1969-11-19
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Granted: 1971-09-14
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Expires: 1989-11-19
Abstract
Abstract A pulse train converter converts a first command pulse train issued by command pulse means to a second command pulse train and supplies the second command pulse train to electrohydraulic pulse motor. The pulse train converter has a storage connected to the command pulse means for storing the difference in the number of pulses of the first and second command pulse trains and an oscillator connected to the storage for issuing the second command pulse train at a frequency proportional to the content of the storage. A comparer coupled between the command pulse means and the motor detects the difference between the number of pulses in the first command pulse train and the revolutions of the motor. A gain control connects the comparer to the pulse train converter in a manner whereby the ratio of the frequency of the second pulse train to the content of the storage is controlled so that the detected difference is in proportion to the frequency of the first command pulse train.
Inventors
- 👤 Seiuemon Inaba
- 👤 Kanryo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:09
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41021; G05B2219/41186; G05B2219/41309; G05B2219/43; G05B2219/43141
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
An error-correcting servosystem for an electrohydraulic pulse motor, said servosystem comprising, command pulse means for issuing a first command pulse train; a pulse train converter for converting the first command pulse train to a second command pulse train and for supplying the second command pulse train to the electrohydraulic pulse motor, said pulse train converter having storage means connected to said command pulse means for storing the difference in the number of pulses of the first and second command pulse trains and oscillator means connected to said storage means for issuing said second command pulse train at a frequency proportional to the content of said storage means; comparing means coupled between the command pulse means and the motor for detecting the difference between the number of pulses in the first command pulse train and the revolutions of said motor; and gain control means connecting the comparing means to the pulse train converter in a manner whereby the ratio of the frequency of the second pulse train to the content of the storage means is controlled so that the detected difference is in proportion to the frequency of the first command pulse train.
Claim 2
Dependent Claim
192 words
An error-correcting servosystem for an electrohydraulic pulse motor, said servosystem comprising, command pulse means for issuing a first command pulse train; a pulse train converter for converting the first command pulse train to a second command pulse train and for supplying the second command pulse train to the electrohydraulic pulse motor, said pulse train converter having storage means connected to said command pulse means for storing the difference in the number of pulses of the first and second command pulse trains and oscillator means connected to said storage means for issuing said second command pulse train at a frequency proportional to the content of said storage means; comparing means coupled between the command pulse means and the motor for detecting the difference between the number of pulses in the first command pulse train and the revolutions of said motor; and gain control means connecting the comparing means to the pulse train converter in a manner whereby the ratio of the frequency of the second pulse train to the content of the storage means is controlled so that the detected difference is in proportion to the frequency of the first command pulse train.
Claim 3
Dependent Claim
28 words
An error-correcting servosystem as claimed in claim 1, further comprising a first counter connected between said command pulse means and said comparing means for counting the command pulses.
Claim 4
Dependent Claim
38 words
An error-correcting servosystem as claimed in claim 1, further comprising a reversible counter having an additive input connected to said command pulse means, a subtractive input coupled to said motor and an output connected to said comparing means.
Claim 5
Dependent Claim
33 words
An error-correcting servosystem as claimed in claim 1, further comprising a pulse generator coupled between said motor and said comparing means for providing a number of pulses proportional the revolutions of said motor.
Claim 6
Dependent Claim
85 words
An error-correcting servosystem as claimed in claim 1, further comprising a first counter connected between said command pulse means and said comparing means for counting the command pulses, a reversible counter having an additive input connected to said command pulse means, a subtractive input coupled to said motor and an output connected to said comparing means, and a pulse generator connected between said motor and the subtractive input of said reversible counter for providing a number of pulses proportional to the revolutions of said motor.
Claim 7
Independent Claim
135 words
A method of error-correcting for an electrohydraulic pulse motor, comprising the steps of issuing a first command pulse train from a command pulse source; converting the first command pulse train to a second command pulse train and supplying the second pulse train to the electrohydraulic pulse motor; storing the difference in the number of pulses of the first and second command pulse trains; issuing the second command pulse train at a frequency proportional to the content of the stored differeNce, detecting the difference between the number of pulses in the first command pulse train and the revolutions of the motor; controlling the ratio of the frequency of the second pulse train to the content of the stored difference so that the detected difference is in proportion to the frequency of the first command pulse train.
Claim 8
Independent Claim
135 words
A method of error-correcting for an electrohydraulic pulse motor, comprising the steps of issuing a first command pulse train from a command pulse source; converting the first command pulse train to a second command pulse train and supplying the second pulse train to the electrohydraulic pulse motor; storing the difference in the number of pulses of the first and second command pulse trains; issuing the second command pulse train at a frequency proportional to the content of the stored differeNce, detecting the difference between the number of pulses in the first command pulse train and the revolutions of the motor; controlling the ratio of the frequency of the second pulse train to the content of the stored difference so that the detected difference is in proportion to the frequency of the first command pulse train.
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |