Magnetic roll

Abstract

A magnetic roll having a rotation axis, the magnetic roll including an axial series of segmented rings, each of the rings' segments incorporating a permanent having an outer end, an inner end, an axial end, an oppositely axial end, a circumferential end, a counter-circumferential end, a north pole positioned at the inner or outer end, and a south pole positioned oppositely from the north pole; a bonding matrix rigidly interconnecting the rings; and a magnetic armature operatively spanning between the permanent magnets' inner ends.

Claims

1. A magnetic roll having a rotation axis, the magnetic roll comprising: (a) an axial series of segmented rings, each of said rings' segments comprising a permanent magnet having an outer end, an inner end, an axial end, an oppositely axial end, a circumferential end, a counter-circumferential end, a north pole positioned at the inner or outer end, and a south pole positioned oppositely from the north pole; (b) a bonding matrix rigidly interconnecting the rings and segments; and (c) a magnetic armature operatively spanning between the permanent magnets' inner ends; wherein a first plurality of magnets among the segmented rings' permanent magnets has outer end north poles having axial and oppositely axial ends, wherein a second plurality of the magnets among the segmented rings' permanent magnets has outer end south poles having axial and oppositely axial ends, wherein each outer end north pole is circumferentially adjacent an outer end south pole; and wherein the axial end of said each outer end north pole is adjacent the oppositely axial end of one of the outer end south poles.

2. The magnetic roll of claim 1 wherein said each outer end north pole is axially adjacent another outer end north pole.

3. The magnetic roll of claim 1 wherein the outer ends of the permanent magnets have circumferential lengths substantially equal to each other.

4. The magnetic roll of claim 3 wherein each segmented ring is circumferentially or counter-circumferentially displaced with respect to an adjacent segmented ring.

5. The magnetic roll of claim 4 wherein the segmented rings' circumferential or counter-circumferential displacements are substantially equal to each other.

6. A magnetic roll having a rotation axis, the magnetic roll comprising: (a) an axial series of segmented rings, each of said rings' segments comprising a permanent magnet having an outer end, an inner end, an axial end, an oppositely axial end, a circumferential end, a counter-circumferential end, a north pole positioned at the inner or outer end, and a south pole positioned oppositely from the north pole; and (b) a bonding matrix rigidly interconnecting the rings and segments; and (c) a magnetic armature operatively spanning between the permanent magnets' inner ends, wherein a first plurality of magnets among the segmented rings' permanent magnets has outer end north poles, wherein a second plurality of the magnets among the segmented rings' permanent magnets has outer end south poles, wherein each outer end north pole is circumferentially adjacent an outer end south pole, wherein said each outer end north pole is axially adjacent another outer end south pole, wherein the outer ends of the permanent magnets have circumferential lengths substantially equal to each other, wherein each segmented ring is circumferentially or counter-circumferentially displaced with respect to an adjacent segmented ring, wherein the segmented rings' circumferential or counter-circumferential displacements are substantially equal to each other, wherein each ring among a plurality of the segmented rings is adjacent a pair of the segmented rings, and wherein said each ring is both circumferentially displaced with respect to one of its adjacent rings and is counter-circumferentially displaced with respect to the other of its adjacent rings.

7. The magnetic roll of claim 6 wherein each circumferential or counter-circumferential displacement is at least as great as one-fourth of the circumferential length and is less than or equal to one-half of the circumferential length.

8. The magnetic roll of claim 7 wherein each segmented ring has an even number of segments.

9. The magnetic roll of claim 8 wherein the magnetic armature has a cylindrical outer surface.

10. The magnetic roll of claim 9 wherein the magnetic armature is composed of iron or steel.

11. The magnetic roll of claim 10 wherein the bonding matrix comprises hardened epoxy resin or a cyanoacryalate base adhesive.

12. The magnetic roll of claim 11 further comprising a rotation axle mounted inwardly from the magnetic armature's cylindrical outer surface.

13. The magnetic roll of claim 12 wherein each permanent magnet is composed of a material selected from the group consisting of a neodymium and iron composite, a samarium, cobalt, and iron composite, an aluminum, nickel, cobalt and iron alloy, and an iron oxide composite ceramic.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of one of the permanent magnet components of the instant inventive magnetic roll.

(2) FIG. 2 is an alternative perspective view of the magnet of FIG. 1.

(3) FIG. 3 is a perspective view of another permanent magnet component of the inventive magnetic roll.

(4) FIG. 4 is an alternative perspective view of the magnet of FIG. 3.

(5) FIG. 5 depicts in an exploded view of three of the segmented magnetic ring components of the instant inventive magnetic roll.

(6) FIG. 6 is a perspective view of a preferred embodiment of the instant inventive magnetic roll.

(7) FIG. 7 is a sectional view as indicated in FIG. 6.

(8) FIG. 8 is an alternative sectional view as indicated in FIG. 6.

(9) FIG. 9 is a magnified view of a portion of the structure of FIG. 6, as indicated in FIG. 6.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

(10) Referring now to the drawings and in particular simultaneously to Drawing FIGS. 1, 2, and 6, a preferred embodiment of the instant inventive magnetic roll is referred to generally by Reference Arrow 1. A permanent magnet segment component of the roll 1 is referred to generally by Reference Arrows 20, such magnet 20 having a convexly arcuately curved radially outer face or end 22, and a concavely arcuately curved radially inner face or end 24. The magnet 20 has an axial end 26, an oppositely axial end 28, a circumferential end 30, and a counter-circumferential end 32. The magnetic characteristics of the magnet 20 include a radially extending polar axis 21 whose north direction is toward the magnet's radially outer end 22, the south direction being toward the radially inner end 24.

(11) Referring simultaneously to FIGS. 3 and 4, a similarly geometrically configured permanent magnet having an opposite magnetic characteristic is referred to generally by Reference Arrows 34. The magnets 34 are preferably configured substantially identically with magnets 20, each magnet 34 having a radially outer end 36, a radially inner end 38, an axial end 40, an oppositely axial end 42, a circumferential end 44, and a counter-circumferential end 46. Similarly with the magnetic polarity line 21 of magnet 20, magnet 34 has a radially extending line of magnetic polarity 35. However, in contrast with magnet 20, magnet 34 situates its south pole at the magnet's radially outer end 36 with its opposing north pole being positioned at its radially inner end 38.

(12) Referring simultaneously to FIGS. 1-5, pluralities of substantially identical renditions of the permanent magnets 20 and 34 are preferably provided. As shown in the example of FIG. 5, paired groups of eight of such magnets 20 and 34 are provided, such paired groups being arranged to form a plurality of magnetic rings which is represented by rings 2, 4, and 6.

(13) Magnetic repulsive tendencies of the magnets 20 and 34 to disarrange themselves from their depicted circular configurations are preferably resisted by, referring further to FIGS. 6 and 9, adhesive bonds 48, such bonds preferably being composed of hardened epoxy resin or a cyanoacryalate based adhesive.

(14) In a preferred configuration of the magnetic rings 2, 4, and 6, each radially outer north pole (i.e., the north poles of the magnets 20) is preferably circumferentially adjacent to a radially outer south pole (i.e., the south poles of magnets 34). Correspondingly, each radially inner north pole is similarly circumferentially adjacent a radially inner south pole. Accordingly, the magnetic rings 2, 4, and 6 advantageously form circumferentially alternating series of north and south poles at both their radially outer and radially inner surfaces.

(15) The total number of permanent magnet segments of each of the rings 2, 4, and 6 is preferably even with half of the magnets having a radially outer north pole as indicated by FIG. 1 and half of the magnets having a radially outer south pole as indicated by FIG. 3. The preferred provision of even numbers of magnets within each of the rings assures that the rings' alternating north and south pole series are circumferentially continuous. The magnetic rings 2, 4, and 6 are preferably configured substantially identically with each other, and referring further to FIG. 6, additional magnetic rings 8,10,12,14,16,18 may be provided, such additional rings also being identically configured.

(16) Referring simultaneously to FIGS. 5 and 6, the depicted exemplary axial series of nine magnetic rings 2-18 is preferably stacked in an abutting and axially aligned series to form or approximate a right tube or right hollow cylinder geometric solid. Normal plane seams (i.e., seams lying within planes to which the rotation axis 55 is normal or perpendicular) which are formed at the abutting axial and oppositely axial faces of the rings 2-18 are preferably bonded and held in place by adhesive bonds similar to epoxy or cyanoacryalate bonds 48 appearing in FIG. 9.

(17) Referring to FIG. 6, each ring among the magnetic rings 2-18 is preferably circumferentially or counter-circumferentially offset with respect to at least one adjacent ring. For examples, the axial-most ring 2 is circumferentially offset with respect to ring 4, and the oppositely axial-most ring 18 is counter-circumferentially offset with respect to ring 16. The medially positioned rings of the roll 1 (i.e., rings 4-16), each of which is adjacent to and is interstitially positioned between a pair of the rings, are preferably both circumferentially and counter-circumferentially offset with respect to their adjacent rings.

(18) The angular magnitude of each ring's relatively adjacent circumferential and/or counter-circumferential offset preferably equals a rotational displacement angle of d where d equals 180 divided by the number of segments in each ring. For the exemplary sixteen segment ring depicted in FIGS. 5, 6, and 8, the displacement angle d is 11.25. Each of the radially outer ends 32 and 36 of the magnet segments 20 and 34 has a circumferential dimension c, and each circumferential offset, or 11.25 angular displacement d, circumferentially or counter-circumferentially moves the magnets' radially outer ends a distance with respect to each other equal to c. A preferred angular displacement or offset equals d or c, as defined above. Notwithstanding, the angular displacement or circumferential offset may suitably be as little as d or c.

(19) Referring to FIGS. 6-8, the utility of the preferred d or c ring offsets is reflected in the response of the roll's magnetic flux densities 66 and 70 to a hypothetical freeing of the magnetic rings 2-18 for independent rotations about axis 55. Upon such free ring rotation, the radially outer north and south poles 22 and 36 of the magnets 20 and 34 are magnetically rotated and counter-rotated to assume a north/south checkerboard pattern (not depicted within views) about the surface of the roll 1. Upon such free rotations of the rings 2-18 toward such checkerboard north/south pole pattern, the sum of the magnetic roll's magnetically induced torque and counter-torque forces or rotational and counter-rotational moments imposed upon the rings 2-18 about axis 55 approaches zero. Such hypothetical checkerboard pattern represents a rotational stable equilibrium orientation of the rings 2-18 at which the cumulative magnitude of the magnetically induced torque and counter-torque forces is at a minimum. Accordingly, at such stable checkerboard pattern, minimal torque and counter-torque forces mechanically applied to the rings 2-18 will begin to move the rings toward the preferred d or C circumferential offsets. At the hypothetical checkerboard pattern, magnetic flux density 66,70 at the radially outer surface of the roll 1 is at a relative minimum.

(20) As the roll's ring offsets are rotatably moved from the above described hypothetical stable checkerboard pattern (i.e., the zero offset position) toward offsets equal to d or c, the mechanical torque and counter-torque needed to be applied to the rings 2-18 progressively increases to a maximum. Upon reaching the d or c offset, the sum of the magnetically induced torque and counter-torque moments correspondingly reaches a maximum. Upon reaching the d or c rotational offset configuration, the cumulative magnitude of the roll's magnetically induced torque and counter-torque moments is significantly higher than that experienced at the stable checkerboard configuration, and correspondingly, the magnetic flux density 66,70 at such configuration is significantly greater than the minimum of the checkerboard pattern. However, the flux density at the d or c position is not maximized.

(21) Levels of mechanically applied torque and counter-torque forces needed to further rotatably move the rings 2-18 from the above described d or c offset positions to the orientations depicted in FIG. 6 (at which the rings 2-18 are offset and counter-offset with respect to each other by the angle d or by the circumferential distance c) progressively lessens to zero. Accordingly, the d or c offset configuration of FIG. 6 represents an unstable rotational equilibrium position. While the rings 2-18 are easily mechanically held at their d or c rotational offset positions, the cumulative magnitude of roll's magnetically induced torque and counter-torque moments is maximized. Thus, the flux density 66,70 drawn in FIGS. 7 and 8 represents an advantageous maximization of magnetic field strength produced at the surface of the roll and achieved through maintenance of a minimum level of mechanically applied torque and counter-torque forces.

(22) The inventive roll 1 may be most easily assembled at the above described hypothetical checkerboard pattern. However, such configuration is relatively undesirable because such configuration minimizes the roll's outer surface magnetic flux density. A second-most easily assembled configuration of the roll 1 is the unstable equilibrium d or c offset configuration of FIG. 6. Such depicted configuration is preferred because it constitutes a zero net magnetic torque position and because the flux density 66,70 at such position is maximized.

(23) Aside from the preferred d or c offset configuration, ring offsets between d or c and d or c are viewed as being more desirable and more beneficial than offsets between zero and d or c.

(24) Referring further to FIG. 9, applications of adhesive bonds 48 at the normal plane seams between rings 2-18 advantageously secure the rings at their depicted maximized magnetic flux density rotational positions.

(25) Upon rotationally and counter-rotationally positioning the rings 2-18 at their preferred d angle or c displaced positions, both alternating and continuous axially extending north and south series of outer surface poles are advantageously formed. Magnets aligned along orientation lines exemplified by line 80 (also represented by the sectional view of FIG. 7) are representative of such alternating axial series of north and south poles, while magnets aligned along orientation lines exemplified by lines 82 and 84 are respectively representative of continuous axial series of south poles and continuous axial series of north poles. The instant inventive roll's preferred alternating circumferential series of north and south poles, in combination with its continuous axial series of north poles, its continuous axial series of south poles, and its alternating axial series of north and south poles advantageously serves to enhance magnetic flux densities 66 and 70, and to enhance the overall magnetic strength of the roll 1.

(26) Referring simultaneously to FIGS. 6-9, the magnetic flux density 66,70 generated by the roll 1 is preferably further enhanced by magnetically armaturing the north and south poles presented at the radially inner ends of the permanent magnets 20 and 34. While the magnetic armature components of the instant inventive roll 1 may suitably comprise variously configured magnetic bridges which span between and interconnect the magnets' radially inner north and south poles, the preferred magnetic armature of the instant invention comprises an iron or mild steel tube 50 whose cylindrical outer surface immediately underlies and provides base support to the magnets 20 and 34. Alternatively, the armature element may comprise a solid steel core.

(27) As indicated in FIGS. 7 and 8, the iron or mild steel tubular armature 50 magnetically interconnects the permanent magnets' inner end north and south poles, effectively allowing circumferential and axial pairs of the magnets 20 and 34 to perform in the manner of horseshoe magnets whose arms extend radially outwardly. Axial and circumferential magnetic force lines 68 and 72 within the solid metal wall of the armature 50 are representative of such advantageous magnetic connecting effect.

(28) A roller axle core 52 which radially underlies the armaturing tube 50 is preferably provided, such axle core receiving a rotation axle 58. Roller end plates 60 and 62 may be mounted to the axial and oppositely axial ends of the roller 1 by means of bolts 64 which extend through the plates 60 and 62, and threadedly mount within sockets 54.

(29) While the principles of the invention have been made clear in the above illustrative embodiment, those skilled in the art may make modifications in the structure, arrangement, portions and components of the invention without departing from those principles. Accordingly, it is intended that the description and drawings be interpreted as illustrative and not in the limiting sense, and that the invention be given a scope at least commensurate with the appended claims.