US3781619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of breaking alternating-current electric motor and devices employing this method
Assignee: Individual
•
Filing: 1972-05-17
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Granted: 1973-12-25
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Expires: 1992-05-17
Abstract
Abstract A method of braking an alternating-current electric motor having power windings some of which are deenergized and shorted, while the others are fed with a half-wave rectified current inducing a rotational electromotive force in the shorted power windings. A device for effecting the method of braking an electric motor according to the invention incorporating a rectifier in the power circuit of the electric motor. Also included into the power circuit of the electric motor are the contacts of an operating starter, said contact being inserted between the motor terminals and the power supply mains. In this case the contact of the braking starter is connected in parallel to the power winding of the electric motor, while the contacts in series with the rectifier are connected parallel to the contacts of the operating starter in the power windings of the motor thus feeding the windings from the power mains through the rectified-current circuit in the process of braking.
Inventors
- 👤 A Kon
- 👤 N Shaparev
- 👤 B Shklovsky
- 👤 G Leibovich
- 👤 M Rashkovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:49
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/18; H02P3/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A device for braking an alternating-current electric motor having at least two power windings comprising in combination: a motor power circuit connected to the terminals of the motor, power means supplying current to said power circuit, a rectifier inserted into said power circuit, an operating starter having contacts connected into said power circuit between the terminals of the motor and the power mains, a braking starter having a first contact connected in parallel to one of the power windings of the motor in said power circuit, and a second contact connected in series with said rectifier and connected in parallel with the contacts of the operating starter in the other power windings of the motor so as to supply current to these windings from the mains through the rectified-current circuit during the process of braking.
Claim 2
Independent Claim
135 words
A device for braking an alternating-current electric motor having at least two power windings comprising in combination: a motor power circuit connected to the terminals of the motor, power means supplying current to said power circuit, a rectifier inserted into said power circuit, an operating starter having contacts connected into said power circuit between the terminals of the motor and the power mains, a braking starter having a first contact connected in parallel to one of the power windings of the motor in said power circuit, and a second contact connected in series with said rectifier and connected in parallel with the contacts of the operating starter in the other power windings of the motor so as to supply current to these windings from the mains through the rectified-current circuit during the process of braking.
Claim 3
Dependent Claim
27 words
A device as claimed in claim 1, comprising a current-limiting resistor connected in series with one of said contacts of the braking starter in the rectified-current circuit.
Claim 4
Dependent Claim
16 words
A device as claimed in claim 1, comprising a step-down transformer connected to the rectified-current circuit.
Claim 5
Independent Claim
92 words
A method of braking an alternating-current motor having at least two power windings; comprising connecting a first one of said power windings in parallel to a braking starter for said motor; connecting the second one of said power windings in series to a rectifier; deenergizing and short-circuiting at least a portion of one of said power windings, and concurrently supplying the other of said power windings with a half-wave rectified current so as to induce a rotational electromotive force in the short-circuited windings adapted to impart a braking force to said motor.
Claim 6
Independent Claim
92 words
A method of braking an alternating-current motor having at least two power windings; comprising connecting a first one of said power windings in parallel to a braking starter for said motor; connecting the second one of said power windings in series to a rectifier; deenergizing and short-circuiting at least a portion of one of said power windings, and concurrently supplying the other of said power windings with a half-wave rectified current so as to induce a rotational electromotive force in the short-circuited windings adapted to impart a braking force to said motor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |