US3791704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trimming apparatus for magnetic suspension systems
Assignee: Cambridge Thermionic Corp
•
Filing: 1971-08-06
•
Granted: 1974-02-12
•
Expires: 1991-08-06
Abstract
Abstract Apparatus is disclosed for trimming magnetic bearings and particularly for trimming magnetic bearings which employ two independently cooperating systems comprising a permanent magnet system and an electromagnet system. Adjustable permanent magnet means are disclosed for maintaining a suspended object in an equilibrium position which is invariant with applied force in at least one dimension. According to one embodiment the trimming is accomplished by mechanically moving adjustable permanent magnets. According to another embodiment of the invention the trimming is accomplished by varying the field of adjustable permanent magnets using at least one magnetizing winding.
Inventors
- 👤 L Perper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:23
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474; F16C32/0476
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
Trimming apparatus for magnetic suspension systems, comprising: a movable object; mutually opposed first and second permanent magnet means for suspending said movable object; separate trimming permanent magnet means for suspending said movable object; means for adjusting the field of said trimming permanent magnet means to an equilibrium poSition invariant with applied force in at least one dimension; first and second electromagnet force applying means for exerting electrically controllable additional forces on said movable object, said first and second electromagnet force applying means positioned to cause said movable object to return to its neutral force position when electrically controllable additional forces are exerted on said movable object; and means for differentially energizing said first and second electromagnet means to cause electrically controllable additional forces to act on said movable object.
Claim 2
Dependent Claim
129 words
Trimming apparatus for magnetic suspension systems, comprising: a movable object; mutually opposed first and second permanent magnet means for suspending said movable object; separate trimming permanent magnet means for suspending said movable object; means for adjusting the field of said trimming permanent magnet means to an equilibrium poSition invariant with applied force in at least one dimension; first and second electromagnet force applying means for exerting electrically controllable additional forces on said movable object, said first and second electromagnet force applying means positioned to cause said movable object to return to its neutral force position when electrically controllable additional forces are exerted on said movable object; and means for differentially energizing said first and second electromagnet means to cause electrically controllable additional forces to act on said movable object.
Claim 3
Dependent Claim
50 words
Trimming apparatus as defined in claim 1 which also includes means primarily responsive to the component of velocity of said movable object in a direction parallel to its longitudinal axis for supplying an input control signal to the means used for adjusting the field of said trimming permanent magnet means.
Claim 4
Dependent Claim
48 words
Trimming apparatus as defined in claim 1 which further includes means primarily responsive to the displacement of said movable object from a predetermined position along its longitudinal axis for supplying an input control signal to the means used for adjusting the field of said trimming permanent magnet means.
Claim 5
Dependent Claim
61 words
Trimming apparatus as defined in claim 1 wherein the means for adjusting the field of a trimming permanent magnet means to an equilibrium position invariant with applied force in at least one dimension comprises a magnetizing winding around said trimming permanent magnet means for establishing the magnetic field of said trimming permanent magnet means and means for energizing said magnetizing winding.
Claim 6
Dependent Claim
21 words
Trimming apparatus as defined in claim 4 wherein the means for energizing the magnetizing winding is accomplished by short electrical pulses.
Claim 7
Dependent Claim
43 words
Trimming apparatus as defined in claim 4 wherein the trimming permanent magnet means consists of magnetic material separated into sections and the magnetizing winding applied to said trimming permanent magnet means permits magnetization of the sections of the magnetic material to be varied.
Claim 8
Dependent Claim
93 words
Trimming apparatus for magnetic suspension systems, comprising: a movable object; separate first and second permanent magnet means for suspending said movable object; means for physically moving the second permanent magnet means whereby the field of the second permanent magnet means is adjusted thereby enabling the movable object to be maintained in an equilibrium position which is invariant with applied force in at least one dimension; electromagnet means for exerting electrically controllable forces on said movable object; and means for energizing said electromagnet means to achieve stability of positioning of the suspended movable object.
Claim 9
Dependent Claim
93 words
Trimming apparatus for magnetic suspension systems, comprising: a movable object; separate first and second permanent magnet means for suspending said movable object; means for physically moving the second permanent magnet means whereby the field of the second permanent magnet means is adjusted thereby enabling the movable object to be maintained in an equilibrium position which is invariant with applied force in at least one dimension; electromagnet means for exerting electrically controllable forces on said movable object; and means for energizing said electromagnet means to achieve stability of positioning of the suspended movable object.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |