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US4295082A
Expired / Lapsed
US
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Pulse width modulated servo circuit
Assignee: Futaba Corp
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Filing: 1980-03-06
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Granted: 1981-10-13
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Expires: 2000-03-06
Abstract
Abstract A motor servo circuit is disclosed. The motor in the motor servo circuit is driven by an output which is obtained by logically adding output pulses of a pulse stretcher circuit which stretches a pulse width of error pulses generated from an OR circuit when pulses inputted to the motor servo circuit and pulses outputted from a pulse generator in response to the input pulses are different in the pulse width to pulses having a predetermined pulse width which are generated at intervals of a predetermined member of the error pulses synchronizing therewith.
Inventors
- 👤 Masato Moto
- 👤 Seigo Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:13
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/02; G05D1/0206; G05D3/00; G05D3/12; G05D3/14; G05D3/18; H; H02; H02P; H02P7/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
A motor servo circuit comprising: a first pulse generator for generating pulses having a pulse width adjusted by external signals and synchronized with input pulses; a pulse width comparator for comparing output pulses from the first generator with the pulse width of the input pulses and generating pulses having a pulse width corresponding to a difference in the pulse width of both of these pulses when the pulse widths are different; a pulse width stretcher for stretching an output of the pulse width comparator; a second pulse generator for generating pulses having a predetermined pulse width at intervals of the generation of predetermined number of the output pulses of the pulse width comparator; an adder for performing an OR of the output pulses of the pulse width stretcher and the second pulse generator; and a motor driven by the output of the adder for adjusting the output pulse width of the first pulse generator in accordance with the rotation angle of the motor.
Claim 2
Dependent Claim
163 words
A motor servo circuit comprising: a first pulse generator for generating pulses having a pulse width adjusted by external signals and synchronized with input pulses; a pulse width comparator for comparing output pulses from the first generator with the pulse width of the input pulses and generating pulses having a pulse width corresponding to a difference in the pulse width of both of these pulses when the pulse widths are different; a pulse width stretcher for stretching an output of the pulse width comparator; a second pulse generator for generating pulses having a predetermined pulse width at intervals of the generation of predetermined number of the output pulses of the pulse width comparator; an adder for performing an OR of the output pulses of the pulse width stretcher and the second pulse generator; and a motor driven by the output of the adder for adjusting the output pulse width of the first pulse generator in accordance with the rotation angle of the motor.
Claim 3
Dependent Claim
36 words
The motor servo circuit as defined in claim 1 wherein the second pulse generator generates the output pulses, the width of which is regulated in response to a minimum pulse width required for driving the motor.
Claim 4
Dependent Claim
30 words
The motor servo circuit as defined in claim 1 wherein the second pulse generator generates the output pulses, the width of which is regulated based upon the power supply voltage.
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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |