US3659175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit to prevent oscillation in an electronic servosystem
Assignee: Information Storage Systems Inc
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Filing: 1970-06-08
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Granted: 1972-04-25
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Expires: 1990-06-08
Abstract
Abstract A closed loop servosystem for positioning a device such as a read/write head in a data disc file in which the deadband in the amplifier of the system is turned on and off at a rate great enough to prevent the buildup of resonance oscillations in the system when the device reaches the zero position.
Inventors
- 👤 Frank J Sordello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/18; G11; G11B; G11B17/00; G11B17/005; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5552; G11B5/5556; G11B5/58; G11B5/596; G11B5/59605; G11B5/59622
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
A servo system for controlling the energization of an actuator employed to move a member in response to a desired position signal, said system comprising: position means for generating a signal responsive to the present position of said member, servo means for comparing the desired and present position signals to generate a signal for energizing said actuator for movement of said member from one side of the null without overshoot toward the desired position, said servo means including a deadband means having a predetermined period of intermittent operation for decreasing the gain of said servo means for a preselected portion of said period and for operating said servo means with unrestricted gain for the remaining portion of said period, thereby limiting any oscillatory movement of said member about the desired position while permitting intermittent movement of said member toward the desired position during said remaining portion of said period.
Claim 2
Dependent Claim
149 words
A servo system for controlling the energization of an actuator employed to move a member in response to a desired position signal, said system comprising: position means for generating a signal responsive to the present position of said member, servo means for comparing the desired and present position signals to generate a signal for energizing said actuator for movement of said member from one side of the null without overshoot toward the desired position, said servo means including a deadband means having a predetermined period of intermittent operation for decreasing the gain of said servo means for a preselected portion of said period and for operating said servo means with unrestricted gain for the remaining portion of said period, thereby limiting any oscillatory movement of said member about the desired position while permitting intermittent movement of said member toward the desired position during said remaining portion of said period.
Claim 3
Dependent Claim
20 words
A servosystem as defined in claim 1 wherein said servo means includes an amplifier for modifying the actuator energizing signal.
Claim 4
Dependent Claim
24 words
A servosystem as defined in claim 2 wherein said amplifier includes a deadband condition which is cycled to cause intermittent energization of the actuator.
Claim 5
Dependent Claim
24 words
A servosystem as defined in claim 3 including means for biasing said amplifier off when the actuator energizing signal reaches a predetermined minimum value.
Claim 6
Dependent Claim
37 words
A servosystem as defined in claim 1 including a switch for controlling operation of the servo means intermittently, said switch being operated at a predetermined period in response to the receipt of a new desired position signal.
Claim 7
Dependent Claim
113 words
A servosystem for movement of a member in response to a desired position signal and for holding said member at said position comprising: an actuator operable upon energization to move said member, means to generate a signal responsive to the present position of said member, means for comparing said present position signal to the desired position signal for generating an energizing signal for causing said actuator to move said member from one side of the null without overshoot toward the desired position, and means for cycling said energizing signal intermittently to on and off periods less than the time required by said servosystem to reach a resonant condition for said member being positioned.
Claim 8
Dependent Claim
113 words
A servosystem for movement of a member in response to a desired position signal and for holding said member at said position comprising: an actuator operable upon energization to move said member, means to generate a signal responsive to the present position of said member, means for comparing said present position signal to the desired position signal for generating an energizing signal for causing said actuator to move said member from one side of the null without overshoot toward the desired position, and means for cycling said energizing signal intermittently to on and off periods less than the time required by said servosystem to reach a resonant condition for said member being positioned.
Claim 9
Dependent Claim
39 words
A servosystem as defined in claim 6 wherein said cycling means includes an amplifier for modifying said energizing signal and having an intermittent deadband condition whereby no energizing signal is supplied to the actuator during preselected periods of time.
Claim 10
Dependent Claim
29 words
A servo system as defined in claim 1 wherein the slope of the curve representing the signal energizing said actuator alternately is changed during said portions of said period.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |