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US3667024A
Expired / Lapsed
US
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Bidirectional servomotor system
Assignee: Philips Home Products Inc
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Filing: 1971-04-21
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Granted: 1972-05-30
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Expires: 1991-04-21
Abstract
Abstract A servomotor system is disclosed which may be used for an antenna rotator or the like with a bidirectional AC motor controlled as to direction by a low voltage relay having double throw contacts. A DC bridge is energized from a rectifier and has an output to a differential amplifier which energizes a high voltage relay and a low voltage relay in selective conditions. For bridge output in a first direction of unbalance, both relays are energized and for bridge output in the opposite direction of unbalance, only the high voltage relay is energized to provide energization to the entire servomotor system.
Inventors
- 👤 Andrew F Deming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:57
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1472
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
170 words
A bidirectional servomotor system, comprising, in combination, a motor unit and a control unit therefor; said motor unit including reversible output means driven by said motor unit, bidirectional rebalance means driven by said motor; said control unit including voltage source means, a DC balanceable circuit having an input and an output, first means connecting said balanceable circuit to said source for energization thereof, second means connecting said rebalance means to said balanceable circuit for bidirectional rebalancing thereof, a differential switch having input terminals and an output, third means connecting said differential switch input to said output of said balanceable circuit, first and second control means having a de-energized condition and first and second energization conditions, fourth means connecting said first and second control means to the output of said differential switch and to different voltages of said source means, fifth means connecting said first and second control means to control energization of said motor unit and to control said reversible motor output means, and means to unbalance said balanceable circuit.
Claim 2
Dependent Claim
170 words
A bidirectional servomotor system, comprising, in combination, a motor unit and a control unit therefor; said motor unit including reversible output means driven by said motor unit, bidirectional rebalance means driven by said motor; said control unit including voltage source means, a DC balanceable circuit having an input and an output, first means connecting said balanceable circuit to said source for energization thereof, second means connecting said rebalance means to said balanceable circuit for bidirectional rebalancing thereof, a differential switch having input terminals and an output, third means connecting said differential switch input to said output of said balanceable circuit, first and second control means having a de-energized condition and first and second energization conditions, fourth means connecting said first and second control means to the output of said differential switch and to different voltages of said source means, fifth means connecting said first and second control means to control energization of said motor unit and to control said reversible motor output means, and means to unbalance said balanceable circuit.
Claim 3
Dependent Claim
17 words
A servomotor system as set forth in claim 1, wherein said differential switch is a differential amplifier.
Claim 4
Dependent Claim
17 words
A servomotor system as set forth in claim 1, wherein said balanceable circuit is a DC bridge.
Claim 5
Dependent Claim
25 words
A servomotor system as set forth in claim 1, wherein said DC balanceable circuit is a DC bridge having only first and second output terminals.
Claim 6
Dependent Claim
31 words
A servomotor system as set forth in claim 1, wherein said differential switch effectively connects the output thereof to either a positive or a negative DC terminal of said source means.
Claim 7
Dependent Claim
19 words
A servomotOr system as set forth in claim 1, wherein said first and second control means are electromagnetic means.
Claim 8
Dependent Claim
35 words
A servomotor system as set forth in claim 1, wherein said first control means is energized in each of said first and second conditions and said second control means is energized in said second condition.
Claim 9
Dependent Claim
35 words
A servomotor system as set forth in claim 1, wherein said first control means is energized with a first DC polarity in said first condition and with a second DC polarity in said second condition.
Claim 10
Dependent Claim
41 words
A servomotor system as set forth in claim 1, wherein said first control means is energized in each of said first and second conditions and said second control means is energized in said second condition and de-energized in said first condition.
Claim 11
Dependent Claim
89 words
A servomotor system as set forth in claim 1, wherein unbalance of said balanceable circuit in either of two directions and energization thereof produces an output from said differential switch to energize said first and second control means selectively in said first and second conditions depending on the direction of circuit unbalance to thus select the direction of said reversible motor output means to drive the rebalance means toward a rebalance of the balanceable circuit whereat the first and second control means are de-energized to stop said motor output.
Claim 12
Dependent Claim
22 words
A servomotor system as set forth in claim 1, including means to prevent false direction of movement of said motor output means.
Claim 13
Dependent Claim
37 words
A servomotor system as set forth in claim 1, including switch means connected to disenable energization of said motor unit during movement of said unbalance means to prevent false direction of movement of said motor output means.
Claim 14
Dependent Claim
49 words
A servomotor system as set forth in claim 1, wherein said fifth connecting means includes means connecting said first control means to control energization of said motor unit and of the entire servomotor system, and includes means connecting said second control means to control said reversible motor output means.
Claim 15
Dependent Claim
46 words
A servomotor system as set forth in claim 1, wherein fourth connecting means includes connecting said first control means between the output of said differential switch and a positive DC terminal of said source means which is also connected to said balanceable circuit to energize same.
Claim 16
Dependent Claim
52 words
A servomotor system as set forth in claim 1, wherein said fourth connecting means includes connecting said second control means between the output of said differential switch and a tap on a DC voltage divider having a potential substantially the same as the potential on an input terminal of said differential switch.
Claim 17
Dependent Claim
21 words
A servomotor system as set forth in claim 1, wherein said first and second control means are first and second relays.
Claim 18
Dependent Claim
23 words
A servomotor system as set forth in claim 16, wherein said first relay has connections to only a single pole single throw contact.
Claim 19
Dependent Claim
31 words
A servomotor system as set forth in claim 16, wherein said second relay has connections to only single pole double-throw contacts to select the rotational direction of said motor output means.
Claim 20
Dependent Claim
30 words
A servomotor system as set forth in claim 18, wherein said first relay has connections to only a single pole single throw contact to control energization to said servomotor system.
Claim 21
Dependent Claim
53 words
A servomotor system as set forth in claim 19, wherein said fourth connecting means connects said first and second relays in series and the junction thereof to said differential switch output, and connects the remaining ends of said first and second relays to low and high voltage DC terminals on said source means.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |