US4331919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for magnetic testing ferromagnetic sheet or strip material using rectangular coils
Assignee: ORB Electrical Steels Ltd
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Filing: 1979-08-28
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Granted: 1982-05-25
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Expires: 1999-08-28
Abstract
Abstract Apparatus for magnetic testing of sheet or strip includes a magnetizing system comprising spaced arrays of substantially parallel rectilinear conductors supported adjacent the plane of sheet or strip to be tested, the conductors being connected to carry magnetizing current so that the fields generated by the arrays are opposed.
Inventors
- 👤 Philip Beckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:19
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12; G01R33/1223
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
Apparatus for measuring power losses in electrical steel strip including a magnetising system comprising spaced arrays of substantially parallel rectilinear conductors supported adjacent the plane of the strip and mounted for rotation about an axis normal thereto, means for energising the conductors to a known degree, the conductors being so disposed that the fluxes generated in the strip by the arrays are opposed and are projected normally of the strip between said arrays whereby to effect uniform linear magnetisation of the strip, and sensor means for measuring the intensity of said fluxes generated in the strip in response to said energisation.
Claim 2
Dependent Claim
101 words
Apparatus for measuring power losses in electrical steel strip including a magnetising system comprising spaced arrays of substantially parallel rectilinear conductors supported adjacent the plane of the strip and mounted for rotation about an axis normal thereto, means for energising the conductors to a known degree, the conductors being so disposed that the fluxes generated in the strip by the arrays are opposed and are projected normally of the strip between said arrays whereby to effect uniform linear magnetisation of the strip, and sensor means for measuring the intensity of said fluxes generated in the strip in response to said energisation.
Claim 3
Dependent Claim
33 words
Apparatus as claimed in claim 1 in which the individual conductors in the arrays are interconnected by further conductors which extend normally of the line of the arrays in the same plane thereof.
Claim 4
Dependent Claim
24 words
Apparatus as claimed in claims 1 or 2 wherein the arrays of conductors are disposed adjacent each of the two faces of the strip.
Claim 5
Dependent Claim
33 words
Apparatus as claimed in claims 1 or 2, wherein the arrays of conductors are combined with a soft magnetic yoke effective to reduce the reluctance of the magnetic circuit which includes said strip.
Claim 6
Dependent Claim
28 words
Apparatus as claimed in claim 4, wherein the yoke comprises a center limb and two outer limbs whose free ends terminate short of the plane of the strip.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 5, wherein the sensor means comprise a coil inductively coupled to the strip.
Claim 8
Dependent Claim
26 words
Apparatus as claimed in claim 6, wherein the sensor means comprises a flat coil lying adjacent the plane of the strip and between the spaced arrays.
Claim 9
Dependent Claim
21 words
Apparatus as claimed in claim 6, wherein the coil is wound around the whole of or a portion of said yoke.
Claim 10
Dependent Claim
18 words
Apparatus as claimed in claim 8, wherein the coil is wound around the center limb of the yoke.
References Cited (Backward Citations)
US2999977A
Cited
US3156862A
Cited
US3504276A
Cited
GB1427703A
Cited
SU527676A1
Cited
US4074249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |