Patent US1524784A successfully refreshed from Google Patents.
Patent US3761148A successfully refreshed from Google Patents.
US3761148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically suspended rotor assembly
Assignee: Individual
•
Filing: 1972-09-15
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Granted: 1973-09-25
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Expires: 1992-09-15
Abstract
Abstract A magnetic rotor is rotationally supported by end thrust bearings while accelerated up to a predetermined speed, the bearings being retracted to transfer suport of the rotor to a magnetic suspension arrangement when rotation exceeds said predetermined speed and the rotor is no longer being accelerated. The bearings are biased into engagement with the rotor shaft and retracted by power operated solenoids that are energized under control of a rotor speed sensor.
Inventors
- 👤 G Grosbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:43
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0442; F16C39/00; F16C39/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
In combination with a rotor assembly having a plurality of peripherally spaced pole faces of the same polarity and a radially inner pole portion of opposite polarity, a non-magnetic shaft fixed to the rotor assembly for rotation therewith, means for accelerating rotation of the rotor assembly about an axis through the shaft, axial thrust bearing means engageable with the shafT for rotational support of the rotor assembly, and means for retracting the bearing means from engagement with the shaft during rotation of the rotor assembly.
Claim 2
Dependent Claim
85 words
In combination with a rotor assembly having a plurality of peripherally spaced pole faces of the same polarity and a radially inner pole portion of opposite polarity, a non-magnetic shaft fixed to the rotor assembly for rotation therewith, means for accelerating rotation of the rotor assembly about an axis through the shaft, axial thrust bearing means engageable with the shafT for rotational support of the rotor assembly, and means for retracting the bearing means from engagement with the shaft during rotation of the rotor assembly.
Claim 3
Dependent Claim
24 words
The combination of claim 1 including magnetic suspension means for floatingly supporting the rotor assembly while the bearing means is disengaged from the shaft.
Claim 4
Dependent Claim
52 words
The combination of claim 2 wherein the bearing retracting means comprising power operated means for displacing the bearing means relative to the shaft, a source of energy and speed sensing means for connecting said source to the power operated means in response to rotation of the rotor assembly above a predetermined speed.
Claim 5
Dependent Claim
27 words
The combination of claim 3 including rotor stabilizing means rendered operative simultaneously with the power operated means to detect and compensate for transverse vibration of the shaft.
Claim 6
Dependent Claim
54 words
The combination of claim 4 wherein said means for accelerating the rotor assembly comprises an accelerating coil positioned peripherally adjacent to the rotor assembly, current pulsating means connecting the accelerating coil to the source of energy, and means responsive to operation of the bearing retracting means for disconnecting the accelerating coil from said source.
Claim 7
Dependent Claim
52 words
The combination of claim 1 wherein the bearing retracting means comprises power operated means for displacing the bearing means relative to the shaft, a source of energy and speed sensing means for connecting said source to the power operated means in response to rotation of the rotor assembly above a predetermined speed.
Claim 8
Dependent Claim
54 words
The combination of claim 6 wherein said means for accelerating the rotor assembly comprises an accelerating coil positioned peripherally adjacent to the rotor assembly, current pulsating means connecting the accelerating coil to the source of energy, and means responsive to operation of the bearing retracting means for disconnecting the accelerating coil from said source.
Claim 9
Dependent Claim
24 words
The combination of claim 7 including magnetic suspension means for floatingly supporting the rotor assembly while the bearing means is disengaged from the shaft.
Claim 10
Dependent Claim
77 words
In combination with a rotor assembly having a plurality of peripherally spaced pole faces of the same polarity, and a radially inner pole portion of opposite polarity, a non-magnetic shaft fixed to the rotor assembly for rotation therewith, axial thrust bearing means engageable with the shaft for rotational support of the rotor assembly, and means for retracting the bearing assembly from engagement with the shaft in response to rotation of the rotor assembly above a predetermined speed.
Claim 11
Dependent Claim
77 words
In combination with a rotor assembly having a plurality of peripherally spaced pole faces of the same polarity, and a radially inner pole portion of opposite polarity, a non-magnetic shaft fixed to the rotor assembly for rotation therewith, axial thrust bearing means engageable with the shaft for rotational support of the rotor assembly, and means for retracting the bearing assembly from engagement with the shaft in response to rotation of the rotor assembly above a predetermined speed.
Claim 12
Dependent Claim
19 words
The combination of claim 9 including means for selectively accelerating the rotor assembly during rotation below said predetermined speed.
Claim 13
Dependent Claim
24 words
The combination of claim 10 including magnetic suspension means for floatingly supporting the rotor assembly while the bearing means is disengaged from the shaft.
Claim 14
Dependent Claim
24 words
The combination of claim 9 including magnetic suspension means for floatingly supporting the rotor assembly while the bearing means is disengaged from the shaft.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |