US3793576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo apparatus
Assignee: Kk Tokyo Keiki Co Ltd ja
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Filing: 1972-05-31
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Granted: 1974-02-19
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Expires: 1992-05-31
Abstract
Abstract A servo apparatus having a servo loop including in series and forwardly a power unit, a first device for achieving relay operation and for controlling the power unit, and a second device for controlling the first device. In this case, the second device is made to have lag characteristic when an input signal thereto increases, while is made to have characteristic stabilizing the servo loop when the input signal decreases to thereby decrease number of relay-like operations of the first device with keeping control accuracy of the servo loop.
Inventors
- 👤 Y Hirokawa
- 👤 M Sato
- 👤 I Masuzawa
- 👤 S Kawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:32
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/16; G05B; G05B5/00; G05B5/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
A servo apparatus comprising a drive unit for positioning a controlled element, a relay like actuator with its output connected to the input of said drive unit, a first feedback generator driven by said drive unit, a summing device receiving an input command signal and an input from said first feedback generator, an operational amplifier with its output connected to the input of said relay like actuator and its input connected to said summing device, a resistive feedback path connected between the output and input of said operational amplifier, a second feedback path device connected between the output and input of said operational amplifier and comprising first, second, and third unilateral current devices, a first capacitor connected in series between said first and second unilateral current devices and the combination connected between said output and input terminals of said operational amplifier, a first resistor connected in series with said third unilateral current device and the combination connected in parallel with said first capacitor and said first, second, and third unilateral current devices poled to pass current toward said input terminal of said operational amplifier when said output terminal is positive relative to said input terminal.
Claim 2
Dependent Claim
195 words
A servo apparatus comprising a drive unit for positioning a controlled element, a relay like actuator with its output connected to the input of said drive unit, a first feedback generator driven by said drive unit, a summing device receiving an input command signal and an input from said first feedback generator, an operational amplifier with its output connected to the input of said relay like actuator and its input connected to said summing device, a resistive feedback path connected between the output and input of said operational amplifier, a second feedback path device connected between the output and input of said operational amplifier and comprising first, second, and third unilateral current devices, a first capacitor connected in series between said first and second unilateral current devices and the combination connected between said output and input terminals of said operational amplifier, a first resistor connected in series with said third unilateral current device and the combination connected in parallel with said first capacitor and said first, second, and third unilateral current devices poled to pass current toward said input terminal of said operational amplifier when said output terminal is positive relative to said input terminal.
Claim 3
Dependent Claim
104 words
A servo apparatus according to claim 1 wherein said second feedback path device further includes fourth, fifth, and sixth unilateral current devices, a second capacitor connected in series between said fourth and fifth unilateral current devices and the combination connected between the output and input terminals of said operational amplifier, a second resistor connected in series with said sixth unilateral current device and the combination connected in parallel with said second capacitor, and said fourth, fifth, and sixth unilateral current devices poled to pass current toward said output terminal of said operational amplifier when said input terminal is positive relative to said output terminal.
Claim 4
Dependent Claim
36 words
A servo apparatus according to claim 2 wherein the junction point between said first resistor and third unilateral current device and the junction point between said sixth unilateral current device and said second resistor are grounded.
Claim 5
Dependent Claim
46 words
A servo apparatus according to claim 3 further including seventh and eighth unilateral current devices connected back to back with one common terminal connected to the input of said operational amplifier and the other common terminal connected to an intermediate point of said resistive feedback path.
Claim 6
Dependent Claim
27 words
A servo apparatus according to claim 4 including a third resistor connected between ground and said other common terminal of said seventh and eighth unilateral current devices.
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) | 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 |