Patent US1624102A successfully refreshed from Google Patents.
US3714535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo displacement limiter with reversing capabilities
Assignee: Bendix Corp
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Filing: 1971-06-25
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Granted: 1973-01-30
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Expires: 1991-06-25
Abstract
Abstract A servo system includes power turn-off, position and direction controlled limit switching for removing excitation to the servo motor at the stop position, while permitting reversing of rotational direction upon command, to eliminate heat generation and the necessity for dissipating the heat.
Inventors
- 👤 M Krivak
- 👤 G Reynolds
- 👤 F Prapis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:25
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
193 words
A servo system, comprising: a motor having a shaft connected to a load for driving the load; means for providing a control signal; means for providing a motor driving signal; means connected to the control signal means and to the driving signal means and responsive to the signals therefrom for applying a signal to the motor for rotating the motor shaft in a predetermined direction; motor shaft displacement responsive means associated with the motor driving signal means and effective upon a predetermined shaft displacement for disconnecting the driving signal means from the signal applying means to stop the motor; and said control signal means including means for providing a servo command signal; means for providing a servo follow-up signal; means for combining the command and follow-up signals; and operational amplifier having a first input terminal, a first output terminal connected to the signal applying means, a grounded second output terminal and a power terminal; an amplifier biasing circuit connected to the second input terminal; a feedback circuit connected to the first output terminal and to the first input terminal; and a power conductor connected to the biasing circuit and to the power terminal.
Claim 2
Dependent Claim
193 words
A servo system, comprising: a motor having a shaft connected to a load for driving the load; means for providing a control signal; means for providing a motor driving signal; means connected to the control signal means and to the driving signal means and responsive to the signals therefrom for applying a signal to the motor for rotating the motor shaft in a predetermined direction; motor shaft displacement responsive means associated with the motor driving signal means and effective upon a predetermined shaft displacement for disconnecting the driving signal means from the signal applying means to stop the motor; and said control signal means including means for providing a servo command signal; means for providing a servo follow-up signal; means for combining the command and follow-up signals; and operational amplifier having a first input terminal, a first output terminal connected to the signal applying means, a grounded second output terminal and a power terminal; an amplifier biasing circuit connected to the second input terminal; a feedback circuit connected to the first output terminal and to the first input terminal; and a power conductor connected to the biasing circuit and to the power terminal.
Claim 3
Dependent Claim
193 words
A servo system, comprising: a motor having a shaft connected to a load for driving the load; means for providing a control signal; means for providing a motor driving signal; means connected to the control signal means and to the driving signal means and responsive to the signals therefrom for applying a signal to the motor for rotating the motor shaft in a predetermined direction; motor shaft displacement responsive means associated with the motor driving signal means and effective upon a predetermined shaft displacement for disconnecting the driving signal means from the signal applying means to stop the motor; and said control signal means including means for providing a servo command signal; means for providing a servo follow-up signal; means for combining the command and follow-up signals; and operational amplifier having a first input terminal, a first output terminal connected to the signal applying means, a grounded second output terminal and a power terminal; an amplifier biasing circuit connected to the second input terminal; a feedback circuit connected to the first output terminal and to the first input terminal; and a power conductor connected to the biasing circuit and to the power terminal.
Claim 4
Dependent Claim
193 words
A servo system, comprising: a motor having a shaft connected to a load for driving the load; means for providing a control signal; means for providing a motor driving signal; means connected to the control signal means and to the driving signal means and responsive to the signals therefrom for applying a signal to the motor for rotating the motor shaft in a predetermined direction; motor shaft displacement responsive means associated with the motor driving signal means and effective upon a predetermined shaft displacement for disconnecting the driving signal means from the signal applying means to stop the motor; and said control signal means including means for providing a servo command signal; means for providing a servo follow-up signal; means for combining the command and follow-up signals; and operational amplifier having a first input terminal, a first output terminal connected to the signal applying means, a grounded second output terminal and a power terminal; an amplifier biasing circuit connected to the second input terminal; a feedback circuit connected to the first output terminal and to the first input terminal; and a power conductor connected to the biasing circuit and to the power terminal.
Claim 5
Dependent Claim
171 words
A servo system as described by claim 1, wherein: the control signal is an alternating signal having positive and negative half-cycles; the means for providing driving signals includes means for providing a first signal having positive half-cycles and means for providing a second signal having negative half-cycles; the means connected to the control signal means and to the driving signal means and responsive to the signals therefrom for applying a signal to the motor for rotating the motor shaft in a predetermined direction includes a first current flow control device affected by the positive half-cycle of the alternating signal for applying a positive half-cycle of the first signal to the motor and a second current flow control device affected by the negative half-cycle of the alternating signal for applying a negative half-cycle of the second signal to the motor; and the motor is responsive to the full cycle signal including the positive and negative half-cycles of the first and second signals so that the motor shaft rotates in the predetermined direction.
Claim 6
Dependent Claim
166 words
A servo system as described by claim 2, wherein the means for providing driving signals including means for providing a first signal having positive half-cycles and means for providing a second signal having negative half-cycles comprises: means for providing an alternating signal; a transformer having a primary winding connected to the alternating signal means and a secondary winding inductively coupled to the primary winding; a third current flow control device connected to one of the legs of the secondary winding and a fourth current flow control device connected to the other leg in opposing relation to the third device; a fifth current flow control device connected to the one leg in opposing relation to the third device and a sixth current flow control device connected to the other leg in opposing relation to the fourth device; and the fourth and fifth devices cooperating to provide the first signal having positive half-cycles and the third and sixth devices cooperating to provide the second signal having negative half-cycles.
Claim 7
Dependent Claim
157 words
A servo system as described by claim 3, wherein the motor shaft displacement responsive means associated with the motor driving signal means and effective uPon a predetermined shaft displacement for disconnecting the driving signal means from the signal applying means to stop the motor includes: a normally closed first switch connected between the one leg of the secondary winding and the third and fifth current flow control devices; a normally closed second switch connected between the other leg of the secondary winding and the fourth and sixth current flow control devices; first switch actuating means coupled to the motor shaft and to the first switch for opening the first switch when the motor shaft displacement is at a predetermined limit in one sense; and second switch actuating means coupled to the motor shaft and to the second switch for opening the second switch when the motor shaft displacement is at a predetermined limit in an opposite sense.
Claim 8
Dependent Claim
45 words
A servo system as described by claim 1, wherein the biasing circuit includes: a first resistor connected to the second input terminal; a power supply serially connected to the first resistor; and a second resistor connected in parallel with the first resistor and the battery.
Claim 9
Dependent Claim
26 words
A servo system as described by claim 6, wherein: the power conductor is connected to the biasing circuit between the first resistor and the power supply.
References Cited (Backward Citations)
US3119956A
Cited
US3525918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |