Claims
- 1. A yoked magnetic structure having a pair of spaced magnetized members defining a cavity, and comprising at least a first element of triangular cross section having one side abutting an end of one of said magnetized members and a second element of triangular cross section having one side abutting the adjacent side of said cavity, and a yoke at least partially enclosing both of said magnetized members and the first and second elements, said first and second elements having second sides away from said magnetized member and cavity, said first and second elements having magnetization amplitudes and directions to establish equipotential lines at said second sides of said elements that define at least part of an equipotential line independently of said yoke, whereby the flux density on the side of said equipotential line away from said magnetized structure is zero.
- 2. The yoked magnetic structure of claim 1 wherein a side of said second element abuts a side of said first element along an interface line.
- 3. The yoked magnetic structure of claim 1 wherein said yoke is a passive structure comprised of ferro magnetic material.
- 4. The yoked magnetic structure of claim 1 wherein said yoke is an active structure comprised of magentized material.
- 5. The yoked magnetic structure of claim 1 wherein said yoke extends around and abuts said first and second elements.
- 6. The yoked magnetic structure of claim 1 wherein said yoke extends around and is spaced from said first and second elements, thereby defining a region between said yoke and first and second elements having a constant zero potential and flux density of zero.
- 7. The yoked magnetic structure of claim 1 further comprising a layer of constant thickness of a high permeability ferromagnetic material defining an interface between each magnetized member and said cavity.
- 8. The yoked magnetic structure of claim 2 wherein said spaced magnetized members have a magnetization J.sub.1 and the direction of said interface line is defined by a vector diagram having first and second lines parallel to the interface of said cavity and a magnetized member, a third line extending perpendicularly between said parallel lines and having a length proportional to J.sub.1, and a point on said third line spaced from said first line a distance proportional to .mu..sub.0 H.sub.0, a fourth line extending between said point and said first line and having a length proportional to J.sub.2, and a fifth line extending between said point and said second line and having a length proportional to J.sub.3, said fourth and fifth lines defining diameters of a pair of circles, said interface line extending in a direction parallel to a sixth line between said point and the intersection of said circles, wherein J.sub.2 and J.sub.3 are magnetizations of said first and second elements and H.sub.0 is the field in said cavity.
- 9. A yoked magnetic structure having a pair of parallel spaced magnetized members having a magnetization J.sub.1 and defining a cavity therebetween, said cavity having an equatorial plane between said magnetized members, first and second magnetized elements having triangular cross sections and having magnetizations J.sub.2 and J.sub.3 respectively, said first and second elements having colinear first sides abutting an end of one of said magnetized members and extending from said one magnetized member to said equatorial plane, respectively, and a yoke at least partially surrounding said magnetic structure, said first and second elements having second sides away from said magnetized member and cavity, the magnetization amplitude and direction of said first and second magnetized elements defining at least part of an equipotential line at said first and second sides, in the absence of said yoke, whereby the flux density on the side of said equipotential line away from said magnetized structure is zero.
- 10. The yoked magnetic structure of claim 9 wherein said magnetized elements have third sides that abut one another to define an interface line.
- 11. The yoked magnetic structure of claim 9 wherein J.sub.1 =J.sub.2 =J.sub.3.
- 12. The yoked magnetic structure of claim 9 wherein:
- J.sub.2 .gtoreq.(1-K)J.sub.1
- and
- J.sub.3 .gtoreq.KJ.sub.1
- wherein ##EQU14## and H.sub.0 is the field in said cavity and .mu..sub.0 is the permability of a vacuum.
- 13. The yoked magnetic structure of claim 9 further comprising a layer of uniform thickness of material having a high permeability defining an interface between said cavity and said one magnetized member.
- 14. The yoked magnetic structure of claim 10 wherein said interface line extends parallel to a vector defined by a vector diagram having first and second parallel lines spaced apart and perpendicular to opposite ends of a third line having a length proportional to J.sub.1, a point on said third line being spaced from said first line a distance proportional to .mu..sub.0 H.sub.0, wherein .mu..sub.0 is the permeability of a vacuum and H.sub.0 is the field in said cavity, a first circle having a diameter line proportional to J.sub.3 that extends between said point and said first line, a second circle having a diameter line proportional to J.sub.2 that extends between said point and said second line, said fourth line extending between said point and the intersection of said first and second circles.
- 15. A yoked magnetic structure having a magnetized member extending along and spaced from a longitudinal axis and defining a part of a cavity, and an end yoked magnetic structure abutting an end of said magnetized member, said end structure comprising a triangular cross section magnetized element having a first side abutting an end of said magnetized member, said triangular cross section element having an edge opposite to said first side that is closer to said longitudinal axis than said magnetized member, said cavity being open between said opposite edge and said longitudinal axis, said triangular cross section element having a side away from said axis that defines at least part of an equipotential line whereby the flux density on the side of said equipotential line away from said magnetized structure is substantially zero.
- 16. A yoked magnetic structure having a pair of parallel spaced magnetized members extending along and spaced from a longitudinal axis and defining a cavity, and an end yoked magnetic structure abutting an end of said magnetized members, said end structure comprising a triangular cross section magnetized element having a first side abutting an end of one of said magnetized members, said triangular cross section element having an edge opposite to said first side that is closer to said longitudinal axis than said spaced magnetized members, said cavity being open between said opposite edge and said longitudinal axis, said triangular cross section element having a side away from said axis that defines at least part of an equipotential line whereby the flux density on the side of said equipotential line away from said magnetized structure is substantially zero.
- 17. The yoked magnetic structure of claim 16 wherein said triangular cross section element has ends that are in planes at acute angles to the longitudinal axis of the element, whereby at least two sides of said element are trapezoidal in shape.
- 18. The yoked magnetic structure of claim 17 further comprising separate triangular pyramidal elements of magnetized material having sides abutting said ends of said triangular cross section element.
PRIOR APPLICATIONS
This application is a continuation-in-part of application Ser No. 591,458 filed Oct. 1, 1990, and now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3227931 |
Adler |
Jan 1966 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
591458 |
Oct 1990 |
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