US5337472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cylindrical and spherical permanent magnet structures
Assignee: United States Department of the Army
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Filing: 1993-05-26
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Granted: 1994-08-16
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Expires: 2013-05-26
Abstract
Abstract Methods of manufacturing rings, cylinders, hemispheres and spheres having aelatively strong central working field. The manufacture of complex magnetic structures is greatly simplified by a method of cutting wedge shaped portions radially into sections, rotating the bonded sections about a radial axis prior to magnetization, magnetizing the sections in a uniform magnetic field, rotating the magnetic sections into their original positions thereby forming the resulting desired permanent magnet structure. In another embodiment, another method of making a hemispherical or spherical magnet structure using rings ground into wedge shaped portions and reassembled is disclosed. In another embodiment, a method of manufacturing a cylindrical quadrupole is disclosed whereby sections of a magic ring are removed and collapsed to form half a cylinder and combined with an analogously collapsed magic ring forming a second half cylinder and combined to form a quadrupole. The methods of the present invention greatly simplify and facilitate the manufacture of complex permanent magnet structures incorporating the so-called "magic" ring principles in the fabrication of a permanent magnet structure having relatively high magnetic fields within a central working space.
Inventors
- 👤 Herbert A. Leupold
- 👤 George F. McLane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:33
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/383; H; H01; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49789; Y10T29/49794; Y10T29/49796
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
104 words
A method of making a permanent magnet structure having a central working space of high magnetic field comprising the steps of: forming a magnet structure of a predetermined size and shape; dividing the magnet structure into portions by radially slicing the portions of the magnet structure outwardly from a central axis; magnetizing the portions in a magnetic field having a direction parallel to a desired resultant magnetic field in the working space of the permanent magnet structure; rotating bounded sections of the portions about the central axis from their original position in the magnet structure; and combining the portions into the permanent magnet structure.
Claim 2
Independent Claim
104 words
A method of making a permanent magnet structure having a central working space of high magnetic field comprising the steps of: forming a magnet structure of a predetermined size and shape; dividing the magnet structure into portions by radially slicing the portions of the magnet structure outwardly from a central axis; magnetizing the portions in a magnetic field having a direction parallel to a desired resultant magnetic field in the working space of the permanent magnet structure; rotating bounded sections of the portions about the central axis from their original position in the magnet structure; and combining the portions into the permanent magnet structure.
Claim 3
Dependent Claim
18 words
A method of forming a magnet structure as in claim 1 wherein: said magnet structure is a ring.
Claim 4
Dependent Claim
18 words
A method of forming a magnet structure as in claim 1 wherein: said magnet structure is a cylinder.
Claim 5
Dependent Claim
18 words
A method of forming a magnet structure as in claim 1 wherein: said magnet structure is a hemisphere.
Claim 6
Dependent Claim
18 words
A method of forming a magnet structure as in claim 1 wherein: said magnet structure is a sphere.
Claim 7
Independent Claim
110 words
A method of making a substantially polyhedral magnetic structure comprising the steps of: slicing a magnetized cylinder into a plurality of rings; cutting each of said plurality of rings into a plurality of segments; interchanging pairs of each of said plurality of segments forming a magic ring; removing magnetic material from each of the plurality of rings forming two wedges defined by two planes intersecting at a point on the axis of the cylinder and forming a line at their intersection perpendicular to the axis; and arranging the two wedges from each of the plurality of rings azimuthally forming a polyhedral; whereby an approximation to a magic hemisphere is formed.
Claim 8
Independent Claim
110 words
A method of making a substantially polyhedral magnetic structure comprising the steps of: slicing a magnetized cylinder into a plurality of rings; cutting each of said plurality of rings into a plurality of segments; interchanging pairs of each of said plurality of segments forming a magic ring; removing magnetic material from each of the plurality of rings forming two wedges defined by two planes intersecting at a point on the axis of the cylinder and forming a line at their intersection perpendicular to the axis; and arranging the two wedges from each of the plurality of rings azimuthally forming a polyhedral; whereby an approximation to a magic hemisphere is formed.
Claim 9
Dependent Claim
38 words
A method as in claim 6 further comprising the steps of: cutting the magic sphere forming a magic hemisphere; and placing a planar plate of high saturation, high permeability material adjacent to the open end of the hemisphere.
Claim 10
Dependent Claim
30 words
A method of making a magnetic structure as in claim 6 further comprising the step of: drilling a hole through a polar axis for accessing the central working space therein.
Claim 11
Independent Claim
171 words
A method of making a multi-polar permanent magnet structure comprising the steps of: cutting a magnetized first cylinder into first segments; interchanging pairs of said first segments forming a first temporary cylinder having an internal working space with a substantial uniform magnetic field therein; cutting the first segments radially into multiple first pieces; removing one-half of the first pieces from each first segment leaving first partial segments; collapsing the first partial segments while maintaining their order forming a first half of a cylinder; cutting a magnetized second cylinder into second segments; interchanging pairs of said second segments forming a second temporary cylinder having an internal working space with a substantially uniform magnetic field therein; cutting the second segments radially into multiple second pieces; removing one-half of the second pieces from each second segments leaving second partial segments; collapsing the second partial segments while maintaining their order forming a second half a cylinder; and combining said first half cylinder with said second half cylinder forming a third cylinder, thereby forming a quadrupole.
Claim 12
Independent Claim
171 words
A method of making a multi-polar permanent magnet structure comprising the steps of: cutting a magnetized first cylinder into first segments; interchanging pairs of said first segments forming a first temporary cylinder having an internal working space with a substantial uniform magnetic field therein; cutting the first segments radially into multiple first pieces; removing one-half of the first pieces from each first segment leaving first partial segments; collapsing the first partial segments while maintaining their order forming a first half of a cylinder; cutting a magnetized second cylinder into second segments; interchanging pairs of said second segments forming a second temporary cylinder having an internal working space with a substantially uniform magnetic field therein; cutting the second segments radially into multiple second pieces; removing one-half of the second pieces from each second segments leaving second partial segments; collapsing the second partial segments while maintaining their order forming a second half a cylinder; and combining said first half cylinder with said second half cylinder forming a third cylinder, thereby forming a quadrupole.
Claim 13
Dependent Claim
101 words
A method of making a multi-polar permanent magnet structure as in claim 9 further comprising the steps of: cutting the first partial segments and the second partial segments in half forming first and second half partial segments; removing the first half partial segments and the second half partial segments alternately; compressing the remaining first half partial segments and the second half partial segments maintaining their order forming a third half a cylinder; compressing the removed first half partial and the second half partial segments maintaining their order forming a fourth half a cylinder, whereby a multi-pole permanent magnet cylinder is formed.
Claim 14
Independent Claim
195 words
A method of making a multi-polar permanent magnet structure comprising the steps of: cutting a first permanent magnet cylinder radially into a first plurality of sections; forming a first magic cylinder from the first plurality of sections having an internal working space with a substantially uniform magnetic field therein; cutting a second permanent magnet cylinder radially into a second plurality of sections; forming a second magic cylinder from the second plurality of sections having an internal working space with a substantially uniform magnetic field therein; removing every other section of the first and second magic cylinders; forming a first pair of partial cylinders from the first plurality of sections of the first magic cylinder; forming a second pair of partial cylinders from the second plurality of sections of the second magic cylinder; comprising the first pair of partial cylinders to form a first pair of complementary half cylinders; comprising the second pair of partial cylinders to form a second pair of complementary half cylinders; and combining one each of the first pair of complementary half cylinders with one each of the second pair of complementary half cylinders, whereby a pair of quadrupole cylinders are formed.
Claim 15
Independent Claim
195 words
A method of making a multi-polar permanent magnet structure comprising the steps of: cutting a first permanent magnet cylinder radially into a first plurality of sections; forming a first magic cylinder from the first plurality of sections having an internal working space with a substantially uniform magnetic field therein; cutting a second permanent magnet cylinder radially into a second plurality of sections; forming a second magic cylinder from the second plurality of sections having an internal working space with a substantially uniform magnetic field therein; removing every other section of the first and second magic cylinders; forming a first pair of partial cylinders from the first plurality of sections of the first magic cylinder; forming a second pair of partial cylinders from the second plurality of sections of the second magic cylinder; comprising the first pair of partial cylinders to form a first pair of complementary half cylinders; comprising the second pair of partial cylinders to form a second pair of complementary half cylinders; and combining one each of the first pair of complementary half cylinders with one each of the second pair of complementary half cylinders, whereby a pair of quadrupole cylinders are formed.
Claim 16
Independent Claim
102 words
A method of making a quadrupole permanent magnetic structure comprising the steps of: cutting a permanent magnet ring radially into a plurality of sections; dividing the plurality of sections into first and second alternating sections; raising the first alternating sections; rotating the raised first alternating sections matching the outer edge of the unraised second alternating sections; applying a transverse magnetic field to the first and second alternating sections; compressing the first alternating sections into a first half ring; compressing the second alternating sections into a second half ring; and combining the first and second half rings, whereby a quadrupole ring is formed.
Claim 17
Independent Claim
102 words
A method of making a quadrupole permanent magnetic structure comprising the steps of: cutting a permanent magnet ring radially into a plurality of sections; dividing the plurality of sections into first and second alternating sections; raising the first alternating sections; rotating the raised first alternating sections matching the outer edge of the unraised second alternating sections; applying a transverse magnetic field to the first and second alternating sections; compressing the first alternating sections into a first half ring; compressing the second alternating sections into a second half ring; and combining the first and second half rings, whereby a quadrupole ring is formed.
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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |