Patent US3590351A successfully refreshed from Google Patents.
US3590351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control, including brake applying, and suppressing of the counter emf, and method
Assignee: Individual
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Filing: 1969-06-23
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Granted: 1971-06-29
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Expires: 1989-06-23
Abstract
Abstract Includes resistors and circuitry for connecting them across the motor winding, means holding the circuitry open during normal operation of the motor, a STOP switch for stopping the motor, and means operative on actuation of that switch for connecting the resistors in the circuitry, and thereafter opening the motor drive circuit, whereby the counter e.m.f. is directed through the resistors.
Inventors
- 👤 Arthur K Littwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:00
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/18; H02P3/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
Control means for an electrical motor having a winding, comprising, a. a first circuit for driving the motor, b. resistor means, c. a second circuit for connecting the resistor means across the motor winding, d. brake means for stopping the motor and electrically controlled means for applying the brake means, e. switch means for closing the second circuit of (c) for thereby connecting the resistor means across the motor winding, f. time delay means controlled by the switch means of (e) and operative following a predetermined period of time after actuation of that switch means for opening the first circuit of (a), g. means for applying the brake means of (d).
Claim 2
Dependent Claim
111 words
Control means for an electrical motor having a winding, comprising, a. a first circuit for driving the motor, b. resistor means, c. a second circuit for connecting the resistor means across the motor winding, d. brake means for stopping the motor and electrically controlled means for applying the brake means, e. switch means for closing the second circuit of (c) for thereby connecting the resistor means across the motor winding, f. time delay means controlled by the switch means of (e) and operative following a predetermined period of time after actuation of that switch means for opening the first circuit of (a), g. means for applying the brake means of (d).
Claim 3
Dependent Claim
36 words
Motor control means according to claim 1 and including means operative in response to actuation of the switch means of (e) for applying the brake means following a predetermined period after actuation of that switch means.
Claim 4
Dependent Claim
67 words
Motor control means according to claim 1 wherein, the first circuit includes a plurality of normally opened relay contacts, the second circuit includes a plurality of normally closed contacts, the control means including subcircuit means including a START switch and relay means for controlling the normally open relay contacts in the first circuit, and operative in response to actuation of a start switch for closing those contacts.
Claim 5
Dependent Claim
84 words
Control means according to claim 3 wherein, the circuit means includes main switch means, and it includes subcircuit means normally energized upon closure of the main switch means, operative when energized for retaining the normally closed relay contacts in the second circuit in open condition, and STOP switch means in the subcircuit operative in response to actuation thereof for deenergizing said relay means and enabling the relay contacts in the first circuit to open and the relay contacts of the second circuit to close.
Claim 6
Dependent Claim
58 words
Control means according to claim 4 wherein the relays for closing the relay contacts in the second circuit are arranged in circuit with the relays for controlling the relay contacts in the first circuit, whereby the second circuit is operative for connecting the resistors across the motor winding before the first circuit for driving the motor is opened.
Claim 7
Dependent Claim
56 words
Motor control means according to claim 5 and including, time delay means for controlling the brake means whereby to apply the brake means after the expiration of the predetermined time interval, and means controlled by the STOP circuit for energizing the brake control means whereby the brake is applied after the expiration of said time limit.
Claim 8
Dependent Claim
43 words
Motor control means according to claim 6 wherein, the time delay means includes a timer motor incorporating relay means operative for actuating its contacts after the expiration of said time interval, and the stop circuit includes a stop switch energizing the timer motor.
Claim 9
Dependent Claim
49 words
Motor control means according to claim 7 wherein, the means for opening the motor drive contacts and for operating the brake means are actuated simultaneously by a common control element whereby a time interval transpires between the opening of the motor drive contacts and the application of the brakes.
Claim 10
Dependent Claim
31 words
Motor control means according to claim 8 and including, time delay means for interrupting application of the brake means following a predetermined period of time after application of the brake means.
Claim 11
Independent Claim
93 words
A method of controlling an electrical motor, having a winding, after normally driving the motor and including the steps: a. applying suppressor means across the winding of the motor, b. after step (a) and as a consequence of that step, opening the drive to the motor, c. applying a brake to the motor as a direct consequence of step (a) but after a predetermined time interval, and d. as a consequence of step (a), and following a predetermined time interval after step (c) takes place, releasing the braking force applied to the motor.
Claim 12
Independent Claim
93 words
A method of controlling an electrical motor, having a winding, after normally driving the motor and including the steps: a. applying suppressor means across the winding of the motor, b. after step (a) and as a consequence of that step, opening the drive to the motor, c. applying a brake to the motor as a direct consequence of step (a) but after a predetermined time interval, and d. as a consequence of step (a), and following a predetermined time interval after step (c) takes place, releasing the braking force applied to the motor.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |