US3810683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated magnetic bearing assembly for an induction meter
Assignee: ABB Inc USA
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Filing: 1972-12-21
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Granted: 1974-05-14
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Expires: 1992-12-21
Abstract
Abstract A temperature compensated magnetic bearing assembly for an induction meter includes upper and lower permanent magnets including both series and shunt temperature compensating magnetic flux paths. The magnetic fluxes in the shunt and series paths produce opposing compensating effects with temperature variations to maintain a constant support gap between the permanent magnets throughout an extended temperature range.
Inventors
- 👤 J Keever
- 👤 W Zisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:41
CPC Classifications
G; G01; G01R; G01R11/00; G01R11/02; G01R11/12; G01R11/14; F; F16; F16C; F16C25/00; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0423; F16C32/0427; F16C32/044; F16C32/0444; F16C39/00; F16C39/06; F16C39/063; F16C2370/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
305 words
An induction meter including a stator member, a rotor member, and a magnetic bearing assembly for supporting the rotor member for rotation about a vertical axis, wherein said bearing assembly comprises: upper and lower soft magnetic cup members having a given temperature coefficient of permeability carried in facing concentric alignment by said rotor and stator members, said cup members including lip portions at the open ends defining pole faces in spaced opposing relationship; upper and lower permanent magnets each having opposite annular pole face ends and carried within said cup members with one pole face end of each magnet positioned radially adjacent a cup lip portion and in concentric alignment with the pole face end of the other magnet, a substantial portion of the magnetic fluxes of each of the mutually facing one pole face ends passing radially outward of the pole face ends and through said adjacent cup lip portions so as to be mutually interacting to support said upper permanent magnet at a predetermined support spacing from said lower permanent magnet, and said cup members each defining a series temperature compensating magnetic flux path for returning said interacting magnetic fluxes to the opposite pole face ends of said permanent magnets; and a temperature compensating magnetic sleeve extending between the pole face ends of one of said permanent magnets along the inner diameter thereof and having a temperature coefficient of permeability, opposite from the given temperature coefficient of permeability, said magnetic sleeve defining a shunt temperature compensating magnetic flux path for passing radially inwardly a remaining portion of the one pole face magnetic flux of said one permanent magnet, and said remaining flux portion in said shunt magnetic path and said substantial flux portion in said series magnetic path cooperatively varying in inverse relationships to maintain said predetermined support spacing with changes in temperature.
Claim 2
Dependent Claim
305 words
An induction meter including a stator member, a rotor member, and a magnetic bearing assembly for supporting the rotor member for rotation about a vertical axis, wherein said bearing assembly comprises: upper and lower soft magnetic cup members having a given temperature coefficient of permeability carried in facing concentric alignment by said rotor and stator members, said cup members including lip portions at the open ends defining pole faces in spaced opposing relationship; upper and lower permanent magnets each having opposite annular pole face ends and carried within said cup members with one pole face end of each magnet positioned radially adjacent a cup lip portion and in concentric alignment with the pole face end of the other magnet, a substantial portion of the magnetic fluxes of each of the mutually facing one pole face ends passing radially outward of the pole face ends and through said adjacent cup lip portions so as to be mutually interacting to support said upper permanent magnet at a predetermined support spacing from said lower permanent magnet, and said cup members each defining a series temperature compensating magnetic flux path for returning said interacting magnetic fluxes to the opposite pole face ends of said permanent magnets; and a temperature compensating magnetic sleeve extending between the pole face ends of one of said permanent magnets along the inner diameter thereof and having a temperature coefficient of permeability, opposite from the given temperature coefficient of permeability, said magnetic sleeve defining a shunt temperature compensating magnetic flux path for passing radially inwardly a remaining portion of the one pole face magnetic flux of said one permanent magnet, and said remaining flux portion in said shunt magnetic path and said substantial flux portion in said series magnetic path cooperatively varying in inverse relationships to maintain said predetermined support spacing with changes in temperature.
Claim 3
Dependent Claim
42 words
An induction meter as claimed in claim 1, wherein said one permanent magnet includes the lower permanent magnet and said sleeve terminates in end portions extending substantially in a coplanar relationship with the opposite pole face ends of said lower permanent magnet.
Claim 4
Dependent Claim
47 words
An induction meter as claimed in claim 2, wherein said temperature compensating magnetic sleeve includes radially extending end portions extending from a cylindrical body portion so as to provide an expanded pole face area mutually coacting with the opposite pole face ends of said lower permanent magnet.
Claim 5
Dependent Claim
43 words
An inducation meter as claimed in claim 3, wherein the soft magnetic material forming said cup members includes a positive temperature coefficient of permeability, and wherein said temperature compensating magnetic sleeve is formed of a material having a negative temperature coefficient of permeability.
Claim 6
Dependent Claim
71 words
An induction meter as claimed in claim 4, wherein said temperature compensating magnetic sleeve includes a radial inwardly extending upper flange end and a radial outwardly extending lower flange end, and further wherein said lower cup member has a counterbored mounting portion for receiving said lower flange end of said magnetic sleeve and supporting the lower flange end in overlapping engagement with lower pole face end of said lower permanent magnet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |