Patent US3582741A successfully refreshed from Google Patents.
US3582741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake system for electrical motors
Assignee: Emerson Electric Co
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Filing: 1969-01-28
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Granted: 1971-06-01
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Expires: 1989-01-28
Abstract
Abstract In a capacitor start motor, a centrifugal actuator, acting upon a balanced but floating plate serves a double function of startwinding switch actuator and mechanical brake. A switching arrangement provides smooth dynamic braking until the mechanical brake is actuated.
Inventors
- 👤 Harold D Arnold
- 👤 John G Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:28
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/30; H02K11/00; H02K11/20; H02K11/21; H02K11/23; H02K7/00; H02K7/10; H02K7/102
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
In a capacitor start electric motor having a main winding, a start winding, a capacitor electrically connected to said start winding, a rotor shaft and a fixed part adjacent the rotor shaft, the improvement comprising a plate mounted floatingly within limits about the said shaft; means on said fixed part for restricting rotational and axial movement of said plate with respect to said shaft beyond said limits; braking means mounted on said shaft for rotation therewith and for axial movement with respect to the shaft and loCated with respect to the plate to move into and out of engagement therewith; means for moving said braking means axially into engagement with said plate and moving said plate axially beyond the point of engagement when the shaft is rotating below a predetermined rate and for moving said braking means away from said plate beyond the limit of axial movement permitted said plate by the means on the fixed part when the shaft is rotating above said predetermined rate; biasing means urging said plate toward said braking means, and a starting switch electrically connected to said capacitor, said starting switch having an operating arm positioned and adapted to be moved in response to axial movement of said plate to open and close said switch.
Claim 2
Dependent Claim
211 words
In a capacitor start electric motor having a main winding, a start winding, a capacitor electrically connected to said start winding, a rotor shaft and a fixed part adjacent the rotor shaft, the improvement comprising a plate mounted floatingly within limits about the said shaft; means on said fixed part for restricting rotational and axial movement of said plate with respect to said shaft beyond said limits; braking means mounted on said shaft for rotation therewith and for axial movement with respect to the shaft and loCated with respect to the plate to move into and out of engagement therewith; means for moving said braking means axially into engagement with said plate and moving said plate axially beyond the point of engagement when the shaft is rotating below a predetermined rate and for moving said braking means away from said plate beyond the limit of axial movement permitted said plate by the means on the fixed part when the shaft is rotating above said predetermined rate; biasing means urging said plate toward said braking means, and a starting switch electrically connected to said capacitor, said starting switch having an operating arm positioned and adapted to be moved in response to axial movement of said plate to open and close said switch.
Claim 3
Dependent Claim
17 words
The improvement of claim 1 wherein the plate biasing means is a spring mounted around said shaft.
Claim 4
Dependent Claim
29 words
The improvement of claim 2 wherein the braking means is spring biased toward the plate with a force greater than the bias of the plate toward the braking means.
Claim 5
Dependent Claim
25 words
The improvement of claim 3 wherein the plate is polygonal and the restricting means include axially extending guide angles at meeting edges of said plate.
Claim 6
Dependent Claim
21 words
The improvement of claim 3 wherein the brake means is centrifugally biased away from the plate when the shaft is rotating.
Claim 7
Dependent Claim
105 words
The improvement of claim 1 wherein electrical means operatively associated with the motor provide a dynamic braking system, said means including a double-pole, double-throw, on-off switch having two poles and two pairs of contacts, one of the poles being electrically connected to one end of the main winding and to the capacitor by way of the starting switch and the other pole being electrically connected to the other end of the main winding, the contacts of one pair of contacts being electrically connected to a source of power and one of the contacts of the other pair of contacts being electrically connected to the capacitor.
Claim 8
Dependent Claim
23 words
The improvement of claim 2 wherein the axial movement permitted the plate is greater than the effective axial throw of the braking means.
Claim 9
Dependent Claim
168 words
In a braking system for a rotary electrical motor having a rotor shaft and a fixed part adjacent said rotor shaft, the improvement comprising a plate mounted floatingly within limits about and around said rotor shaft; means on said fixed part for restricting rotational and axial movement of said plate beyond said limits; braking means mounted on said rotor shaft for rotation therewith and for axial movement with respect to said shaft and said plate and located with respect to the plate to move into and out of engagement therewith; means for moving said braking means axially into engagement with said plate and moving said plate axially beyond the point of engagement when the shaft is rotating below a predetermined rate and for moving said braking means away from said plate beyond the limit of axial movement permitted said plate by the means on the fixed part when the shaft is rotating above said predetermined rate; and spring means biasing the said plate toward the said brake means.
Claim 10
Dependent Claim
168 words
In a braking system for a rotary electrical motor having a rotor shaft and a fixed part adjacent said rotor shaft, the improvement comprising a plate mounted floatingly within limits about and around said rotor shaft; means on said fixed part for restricting rotational and axial movement of said plate beyond said limits; braking means mounted on said rotor shaft for rotation therewith and for axial movement with respect to said shaft and said plate and located with respect to the plate to move into and out of engagement therewith; means for moving said braking means axially into engagement with said plate and moving said plate axially beyond the point of engagement when the shaft is rotating below a predetermined rate and for moving said braking means away from said plate beyond the limit of axial movement permitted said plate by the means on the fixed part when the shaft is rotating above said predetermined rate; and spring means biasing the said plate toward the said brake means.
References Cited (Backward Citations)
US2827136A
Cited
US3038109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |