US3735224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay circuit for motor control
Assignee: Sunoco Inc
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Filing: 1972-04-12
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Granted: 1973-05-22
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Expires: 1992-04-12
Abstract
Abstract In order to precisely position a machine driven by a rotating prime mover, the prime mover (electric motor) is electrically reversed to bring it to a stop. A zero speed switch, mounted on the motor shaft, senses when the shaft comes to a stop and at that time deenergizes a relay to open a pair of contacts in series with the motor contactor to stop the motor. The switch also opens the circuit to the winding of a slow-acting relay which, after a time delay, closes a pair of contacts connected in parallel with the previously-mentioned contacts, to prepare the motor for the next operation.
Inventors
- 👤 H Bachofer
- 👤 R Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A circuit for accurate positioning of a device driven by a motor, comprising a reversible driving motor, a first contactor winding which when energized causes rotation of said motor in one direction, a second contactor winding which when energized causes rotation of said motor in the opposite direction, a primary controller for causing energization of said two windings in an essentially alternate manner, a position sensor coupled to said motor-driven device for sensing a desired position thereof, said sensor operating upon said controller to cause it to deenergize said first winding and to energize said second winding in response to the reaching of said desired position by said device; a zero speed switch coupled to said motor, said switch being operated to closed position in response to rotation of said motor in said one direction and being operated to open position under the condition of a zero motor speed; and means acting in response to the opening of said switch for breaking the energization circuits for both of said windings.
Claim 2
Dependent Claim
170 words
A circuit for accurate positioning of a device driven by a motor, comprising a reversible driving motor, a first contactor winding which when energized causes rotation of said motor in one direction, a second contactor winding which when energized causes rotation of said motor in the opposite direction, a primary controller for causing energization of said two windings in an essentially alternate manner, a position sensor coupled to said motor-driven device for sensing a desired position thereof, said sensor operating upon said controller to cause it to deenergize said first winding and to energize said second winding in response to the reaching of said desired position by said device; a zero speed switch coupled to said motor, said switch being operated to closed position in response to rotation of said motor in said one direction and being operated to open position under the condition of a zero motor speed; and means acting in response to the opening of said switch for breaking the energization circuits for both of said windings.
Claim 3
Dependent Claim
41 words
Circuit of claim 1, including also means acting in response to the opening of said switch for reestablishing, upon the lapse of a predetermined time interval measured from the opening of said switch, the energization circuits for both of said windings.
Claim 4
Dependent Claim
48 words
Circuit in accordance with claim 2, wherein said reestablishing means includes a relay having an operating winding connected to be energized upon the closing of said switch, and having a pair of normally closed contacts connected in series in the energization circuits for both of said contactor windings.
Claim 5
Dependent Claim
16 words
Circuit set forth in claim 3, wherein said relay is of the time delay dropout type.
Claim 6
Dependent Claim
26 words
Circuit according to claim 1, wherein said means acts in response to the closing of said switch for establishing energization circuits for both of said windings.
Claim 7
Dependent Claim
45 words
Circuit in accordance with claim 1, wherein said means includes a relay having an operating winding connected in series with said switch in an energization circuit, and having a pair of contacts connected in series in the energization circuits for both of said contactor windings.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |